Patent Publication Number: US-2023164914-A1

Title: Dielectric substrate and method of forming the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This Application is a continuation of and claims priority under 35 U.S.C. § 120 to U.S. patent application Ser. No. 17/443,390, entitled “DIELECTRIC SUBSTRATE AND METHOD OF FORMING THE SAME,” by Jennifer ADAMCHUK, filed Jul. 26, 2021, which claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 63/057,670, entitled “DIELECTRIC SUBSTRATE AND METHOD OF FORMING THE SAME,” by Jennifer ADAMCHUK, filed Jul. 28, 2020, both of which are assigned to the current assignee hereof and incorporated by reference herein in their entireties. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to a dielectric substrate and methods of forming the same. In particular, the present disclosure related to a dielectric substrate for use in a copper-clad laminate structure and a method of forming the same. 
     BACKGROUND 
     Copper-clad laminates (CCLs) include a dielectric material laminated onto or between two layers of conductive copper foil. Subsequent operations transform such CCLs into printed circuit boards (PCBs). When used to form PCBs, the conductive copper foil is selectively etched to form circuitry with through holes that are drilled between layers and metalized, i.e. plated, to establish conductivity between layers in multilayer PCBs. CCLs must therefore exhibit excellent thermomechanical stability. PCBs are also routinely exposed to excessively high temperatures during manufacturing operations, such as soldering, as well as in service. Consequently, they must function at continuous temperatures above 200° C. without deforming and withstand dramatic temperature fluctuations while resisting moisture absorption. The dielectric layer of a CCL serves as a spacer between the conductive layers and can minimize electrical signal loss and crosstalk by blocking electrical conductivity. The lower the dielectric constant (permittivity) of the dielectric layer is, the higher the speed of the electrical signal through the layer will be. A low dissipation factor, which is dependent upon temperature and frequency, as well as the polarizability of the material, is therefore very critical for high-frequency applications. Accordingly, improved dielectric materials and dielectric layers that can be used in PCBs and other high-frequency applications are desired. 
     SUMMARY 
     According to a first aspect, a dielectric substrate may include a polyimide layer and a first filled polymer layer overlying the polyimide layer. The first filled polymer layer may include a resin matrix component, and a first ceramic filler component. The first ceramic filler component may include a first filler material. The first filler material may further have a mean particle size of at not greater than about 10 microns. 
     According to another aspect, a copper-clad laminate may include a copper foil layer and a dielectric substrate overlying the copper foil layer. The dielectric substrate may include a polyimide layer and a first filled polymer layer overlying the polyimide layer. The first filled polymer layer may include a resin matrix component, and a first ceramic filler component. The first ceramic filler component may include a first filler material. The first filler material may further have a mean particle size of at not greater than about 10 microns. 
     According to yet another aspect, a printed circuit board may include a copper foil layer and a dielectric substrate overlying the copper foil layer. The dielectric substrate may include a polyimide layer and a first filled polymer layer overlying the polyimide layer. The first filled polymer layer may include a resin matrix component, and a first ceramic filler component. The first ceramic filler component may include a first filler material. The first filler material may further have a mean particle size of at not greater than about 10 microns. 
     According to another aspect, a method of forming a dielectric substrate may include providing a polyimide layer, combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and forming the first forming mixture into a first filled polymer layer overlying the polyimide layer. The first ceramic filler precursor component may include a first filler precursor material. The first filler precursor material may further have a mean particle size of at not greater than about 10 microns. 
     According to still another aspect, a method of forming a copper-clad laminate may include providing a copper foil and forming a dielectric layer overlying the copper foil. Forming the dielectric layer may include providing a polyimide layer, combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and forming the first forming mixture into a first filled polymer layer overlying the polyimide layer. The first ceramic filler precursor component may include a first filler material. The first filler precursor material may further have a mean particle size of at not greater than about 10 microns. 
     According to yet another aspect, a method of forming a printed circuit board may include providing a copper foil and forming a dielectric layer overlying the copper foil. Forming the dielectric layer may include providing a polyimide layer, combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and forming the first forming mixture into a first filled polymer layer overlying the polyimide layer. The first ceramic filler precursor component may include a first filler material. The first filler precursor material may further have a mean particle size of at not greater than about 10 microns. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments are illustrated by way of example and are not limited to the accompanying figures. 
         FIG.  1    includes a diagram showing a dielectric layer forming method according to embodiments described herein; 
         FIGS.  2   a  and  2   b    include illustrations showing the configuration of dielectric layers formed according to embodiments described herein; 
         FIG.  3    includes a diagram showing a copper-clad laminate forming method according to embodiments described herein; 
         FIGS.  4   a  and  4   b    include illustrations showing the configuration of copper-clad laminates formed according to embodiments described herein; 
         FIG.  5    includes a diagram showing a printed circuit board forming method according to embodiments described herein; and 
         FIGS.  6   a  and  6   b    include illustrations showing the configuration of printed circuit boards formed according to embodiments described herein. 
     
    
    
     Skilled artisans appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. 
     DETAILED DESCRIPTION 
     The following discussion will focus on specific implementations and embodiments of the teachings. The detailed description is provided to assist in describing certain embodiments and should not be interpreted as a limitation on the scope or applicability of the disclosure or teachings. It will be appreciated that other embodiments can be used based on the disclosure and teachings as provided herein. 
     The terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a method, article, or apparatus that comprises a list of features is not necessarily limited only to those features but may include other features not expressly listed or inherent to such method, article, or apparatus. Further, unless expressly stated to the contrary, “or” refers to an inclusive-or and not to an exclusive-or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present). 
     Also, the use of “a” or “an” is employed to describe elements and components described herein. This is done merely for convenience and to give a general sense of the scope of the invention. This description should be read to include one, at least one, or the singular as also including the plural, or vice versa, unless it is clear that it is meant otherwise. For example, when a single item is described herein, more than one item may be used in place of a single item. Similarly, where more than one item is described herein, a single item may be substituted for that more than one item. 
     Embodiments described herein are generally directed to a dielectric substrate that may include a polyimide layer and a first filled polymer layer overlying the polyimide layer, where the first filled polymer layer may include a first resin matrix component, and a first ceramic filler component. 
     Referring first to a method of forming a dielectric substrate,  FIG.  1    includes a diagram showing a forming method  100  for forming a dielectric substrate according to embodiments described herein. According to particular embodiments, the forming method  100  may include a first step  110  of providing a polyimide layer, a second step  120  of combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and a third step  130  of forming the first forming mixture into a first filled polymer layer overlying the polyimide layer. 
     According to particular embodiments, the first ceramic filler precursor component may include a first filler precursor material, which may have particular characteristics that may improve performance of the dielectric substrate formed by the forming method  100 . 
     According to certain embodiments, the first filler precursor material may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a first filler precursor material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the first filler precursor material may have a particular size distribution D 10  value. For example, the D 10  of the first filler precursor material may be at least about 0.2 microns, such as, at least about 0.3 or at least about 0.4 or at least about 0.5 or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the first filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may have a particular size distribution D 50  value. For example, the D 50  of the first filler precursor material may be at least about 0.5 microns, such as, at least about 0.6 or at least about 0.7 or at least about 0.8 or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the first filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may have a particular size distribution D 90  value. For example, the D 90  of the first filler precursor material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the first filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first filler precursor material may have a particular mean particle size as measured using laser diffraction spectroscopy. For example, the mean particle size of the first filler precursor material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the first filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the first filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler precursor material may be described as having a particular particle size distribution span (PSDS), where the PSDS of the first filler precursor material is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the first filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler precursor material. For example, the PSDS of the first filler precursor material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the first filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the first filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler precursor material may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the first filler precursor material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 7.9 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the first filler precursor material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.2 m 2 /g. It will be appreciated that the average surface area of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may include a particular material. According to particular embodiments, the first filler precursor material may include a silica-based compound. According to still other embodiments, the first filler precursor material may consist of a silica-based compound. According to other embodiments, the first filler precursor material may include silica. According to still other embodiments, the first filler precursor material may consist of silica. 
     According to yet other embodiments, the first forming mixture may include a particular content of the first ceramic filler precursor component. For example, the content of the first ceramic filler precursor component may be at least about 30 vol. % for a total volume of the first forming mixture, such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the first ceramic filler precursor component may be not greater than about 57 vol. % for a total volume of the first forming mixture, such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the first ceramic filler precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first ceramic filler precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler precursor component may include a particular content of the first filler precursor material. For example, the content of the first filler precursor material may be at least about 80 vol. % for a total volume of the first ceramic filler precursor component, such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the first filler precursor material may be not greater than about 100 vol. % for a total volume of the first ceramic filler precursor component, such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler precursor component may include a second filler precursor material. 
     According to yet other embodiments, the second filler precursor material may include a particular material. For example, the second filler precursor material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the second filler precursor material may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the second filler precursor material may include TiO 2 . According to still other embodiments, the second filler precursor material may consist of TiO 2 . 
     According to still other embodiments, the first ceramic filler precursor component may include a particular content of the second filler precursor material. For example, the content of the second filler precursor material may be at least about 1 vol. % for a total volume of the first ceramic filler precursor component, such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the second filler precursor material may be not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component, such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the second filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first ceramic filler precursor component may include a particular content of amorphous material. For example, the first ceramic filler precursor component may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the first resin matrix precursor component may include a particular material. For example, the first resin matrix precursor component may include a perfluoropolymer. According to still other embodiments, the first resin matrix precursor component may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin precursor matrix component may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the first resin matrix precursor component may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix precursor component may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the first resin matrix precursor component may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the first forming mixture may include a particular content of the first resin matrix precursor component. For example, the content of the first resin matrix precursor component may be at least about 45 vol. % for a total volume of the forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the first resin matrix precursor component is not greater than about 63 vol. % for a total volume of the first forming mixture or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the first resin matrix precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first resin matrix precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first forming mixture may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the first forming mixture, such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet another embodiment, the second step  120  may further include combining a second resin matrix precursor component and a second ceramic filler precursor component to for a second forming mixture, and the third step  130  may further include forming the second forming mixture into a second filled polymer layer underlying the polyimide layer. 
     According to particular embodiments, the second ceramic filler precursor component may include a third filler precursor material, which may have particular characteristics that may improve performance of the dielectric substrate formed by the forming method  100 . 
     According to certain embodiments, the third filler precursor material may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a third filler precursor material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the third filler precursor material may have a particular size distribution D 10  value. For example, the D 10  of the third filler precursor material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the third filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may have a particular size distribution D 50  value. For example, the D 50  of the third filler precursor material may be at least about 0.5 microns, such as, at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the third filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may have a particular size distribution D 90  value. For example, the D 90  of the third filler precursor material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the third filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the third filler precursor material may have a particular average particle size as measured using laser diffraction spectroscopy. For example, the mean particle size of the third filler precursor material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the third filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the third filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler precursor material may be described as having a particular particle size distribution span (PSDS), where the PSDS of the third filler precursor material is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the third filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler precursor material. For example, the PSDS of the third filler precursor material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the third filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the third filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler precursor material may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the third filler precursor material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 7.9 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the third filler precursor material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may include a particular material. According to particular embodiments, the third filler precursor material may include a silica-based compound. According to still other embodiments, the third filler precursor material may consist of a silica-based compound. According to other embodiments, the third filler precursor material may include silica. According to still other embodiments, the third filler precursor material may consist of silica. 
     According to yet other embodiments, the second forming mixture may include a particular content of the second ceramic filler precursor component. For example, the content of the second ceramic filler precursor component may be at least about 30 vol. % for a total volume of the second forming mixture, such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the second ceramic filler precursor component may be not greater than about 57 vol. % for a total volume of the second forming mixture, such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the second ceramic filler precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second ceramic filler precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler precursor component may include a particular content of the third filler precursor material. For example, the content of the third filler precursor material may be at least about 80 vol. % for a total volume of the second ceramic filler precursor component, such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the third filler precursor material may be not greater than about 100 vol. % for a total volume of the second ceramic filler precursor component, such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler precursor component may include a fourth filler precursor material. 
     According to yet other embodiments, the fourth filler precursor material may include a particular material. For example, the fourth filler precursor material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the fourth filler precursor material may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the fourth filler precursor material may include TiO 2 . According to still other embodiments, the fourth filler precursor material may consist of TiO 2 . 
     According to still other embodiments, the second ceramic filler precursor component may include a particular content of the fourth filler precursor material. For example, the content of the fourth filler precursor material may be at least about 1 vol. % for a total volume of the second ceramic filler precursor component, such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the fourth filler precursor material may be not greater than about 20 vol. % for a total volume of the second ceramic filler precursor component, such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the fourth filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the fourth filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second ceramic filler precursor component may include a particular content of amorphous material. For example, the second ceramic filler precursor component may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the second resin matrix precursor component may include a particular material. For example, the second resin matrix precursor component may include a perfluoropolymer. According to still other embodiments, the second resin matrix precursor component may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin precursor matrix component may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the second resin matrix precursor component may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix precursor component may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the second resin matrix precursor component may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the second forming mixture may include a particular content of the second resin matrix precursor component. For example, the content of the second resin matrix precursor component may be at least about 45 vol. % for a total volume of the forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the second resin matrix precursor component is not greater than about 63 vol. % for a total volume of the second forming mixture or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the second resin matrix precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second resin matrix precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second forming mixture may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the second forming mixture, such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     Referring now to embodiments of the dielectric substrate formed according to forming method  100 ,  FIG.  2   a    includes a diagram of a dielectric substrate  200 . As shown in  FIG.  2   a   , the dielectric substrate  200  may include a polyimide layer  202  and a first filled polymer layer  204  overlying the polyimide layer. As shown in  FIG.  2   a   , the first filled polymer layer  204  may include a first resin matrix component  210  and a first ceramic filler component  220 . 
     According to particular embodiments, the first ceramic filler component  220  may include a first filler material, which may have particular characteristics that may improve performance of the dielectric substrate  200 . 
     According to certain embodiments, the first filler material of the first ceramic filler component  220  may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a first filler material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the first filler material of the first ceramic filler component  220  may have a particular size distribution D 10  value. For example, the D 10  of the first filler material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the first filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  220  may have a particular size distribution D 50  value. For example, the D 50  of the first filler material may be at least about 0.5 microns, such as, at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the first filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  220  may have a particular size distribution D 90  value. For example, the D 90  of the first filler material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the first filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  220  may have a particular average particle size as measured according to laser diffraction spectroscopy. For example, the mean particle size of the first filler material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the first filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the first filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  220  may be described as having a particular particle size distribution span (PSDS), where the PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. For example, the PSDS of the first filler material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the first filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the first filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  220  may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the first filler material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 7.9 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the first filler material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  220  may include a particular material. According to particular embodiments, the first filler material may include a silica-based compound. According to still other embodiments, the first filler material may consist of a silica-based compound. According to other embodiments, the first filler material may include silica. According to still other embodiments, the first filler material may consist of silica. 
     According to yet other embodiments, the first filled polymer layer  204  may include a particular content of the first ceramic filler component  220 . For example, the content of the ceramic filler component  220  may be at least about 30 vol. % for a total volume of the first filled polymer layer  204 , such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the ceramic filler component  220  may be not greater than about 57 vol. % for a total volume of the first filled polymer layer  204 , such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the ceramic filler component  220  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the ceramic filler component  220  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler component  220  may include a particular content of the first filler material. For example, the content of the first filler material may be at least about 80 vol. % for a total volume of the first ceramic filler component  220 , such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the first filler material may be not greater than about 100 vol. % for a total volume of the first ceramic filler component  220 , such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler component  220  may include a second filler material. 
     According to yet other embodiments, the second filler material of the first ceramic filler component  220  may include a particular material. For example, the second filler material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the second filler material of the first ceramic filler component  220  may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the second filler material of the first ceramic filler component  220  may include TiO 2 . According to still other embodiments, the second filler material may consist of TiO 2 . 
     According to still other embodiments, the first ceramic filler component  220  may include a particular content of the second filler material. For example, the content of the second filler material may be at least about 1 vol. % for a total volume of the first ceramic filler component  220 , such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the second filler material may be not greater than about 20 vol. % for a total volume of the first ceramic filler component  220 , such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the second filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first ceramic filler component  220  may include a particular content of amorphous material. For example, the first ceramic filler component  220  may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the first resin matrix component  210  may include a particular material. For example, the first resin matrix component  210  may include a perfluoropolymer. According to still other embodiments, the first resin matrix component  210  may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix component  210  may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the first resin matrix component  210  may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix component  210  may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the first resin matrix component  210  may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the first filled polymer layer  204  may include a particular content of the first resin matrix component  210 . For example, the content of the first resin matrix component  210  may be at least about 45 vol. % for a total volume of the first filled polymer layer  204 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the first resin matrix component  210  is not greater than about 63 vol. % for a total volume of the first filled polymer layer  204  or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the first resin matrix component  210  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first resin matrix component  210  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first filled polymer layer  204  may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the first filled polymer layer  204 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the first filled polymer layer  204 , such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the dielectric substrate  200  may include a particular porosity as measured using x-ray diffraction. For example, the porosity of the substrate  200  may be not greater than about 10 vol. %, such as, not greater than about 9 vol. % or not greater than about 8 vol. % or not greater than about 7 vol. % or not greater than about 6 vol. % or even not greater than about 5 vol. %. It will be appreciated that the porosity of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the porosity of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular average thickness. For example, the average thickness of the dielectric substrate  200  may be at least about 10 microns, such as, at least about 15 microns or at least about 20 microns or at least about 25 microns or at least about 30 microns or at least about 35 microns or at least about 40 microns or at least about 45 microns or at least about 50 microns or at least about 55 microns or at least about 60 microns or at least about 65 microns or at least about 70 microns or even at least about 75 microns. According to yet other embodiments, the average thickness of the dielectric substrate  200  may be not greater than about 2000 microns, such as, not greater than about 1800 microns or not greater than about 1600 microns or not greater than about 1400 microns or not greater than about 1200 microns or not greater than about 1000 microns or not greater than about 800 microns or not greater than about 600 microns or not greater than about 400 microns or not greater than about 200 microns or not greater than about 190 microns or not greater than about 180 microns or not greater than about 170 microns or not greater than about 160 microns or not greater than about 150 microns or not greater than about 140 microns or not greater than about 120 microns or even not greater than about 100 microns. It will be appreciated that the average thickness of the dielectric substrate  200  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average thickness of the dielectric substrate  200  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 20% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 80% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 20% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 80% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 20% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 80% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 20% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 80% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 20% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 80% RH. For example, the dielectric substrate  200  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  200  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  200  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  200  may have a particular coefficient of thermal expansion as measured according to IPC-TM-650 2.4.24 Rev. C Glass Transition Temperature and Z-Axis Thermal Expansion by TMA. For example, the dielectric substrate  200  may have a coefficient of thermal expansion of not greater than about 80 ppm/° C. 
     According to other embodiments of a dielectric substrate formed according to forming method  100 ,  FIG.  2   b    includes a diagram of a dielectric substrate  201 . As shown in  FIG.  2   b   , the dielectric substrate  201  may include the polyimide layer  202 , the first filled polymer layer  204  overlying the polyimide layer, and a second filled polymer layer  206  underlying the polyimide layer. As shown in  FIG.  2   b   , the second filled polymer layer  206  may include a second resin matrix component  230  and a second ceramic filler component  240 . 
     According to particular embodiments, the second ceramic filler component  240  may include a third filler material, which may have particular characteristics that may improve performance of the dielectric substrate  201 . 
     According to certain embodiments, the third filler material of the second ceramic filler component  240  may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a third filler material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the third filler material of the second ceramic filler component  240  may have a particular size distribution D 10  value. For example, the D 10  of the third filler material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the third filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  240  may have a particular size distribution D 50  value. For example, the D 50  of the third filler material may be at least about 0.5 microns, such as, at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the third filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  240  may have a particular size distribution D 90  value. For example, the D 90  of the third filler material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the third filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  240  may have a particular average particle size as measured according to laser diffraction spectroscopy. For example, the mean particle size of the third filler material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the third filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the third filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  240  may be described as having a particular particle size distribution span (PSDS), where the PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler material, D 10  is equal to a D 10  particle size distribution measurement of the third filler material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler material. For example, the PSDS of the third filler material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the third filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the third filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  240  may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the third filler material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 9.9 m 2 /g or not greater than about 9.5 m 2 /g or not greater than about 9.0 m 2 /g or not greater than about 8.5 m 2 /g or not greater than about 8.0 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the third filler material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  240  may include a particular material. According to particular embodiments, the third filler material may include a silica-based compound. According to still other embodiments, the third filler material may consist of a silica-based compound. According to other embodiments, the third filler material may include silica. According to still other embodiments, the third filler material may consist of silica. 
     According to yet other embodiments, the first filled polymer layer  204  may include a particular content of the second ceramic filler component  240 . For example, the content of the second ceramic filler component  240  may be at least about 30 vol. % for a total volume of the second ceramic filler component  240 , such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the second ceramic filler component  240  may be not greater than about 57 vol. % for a total volume of the first filled polymer layer  204 , such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the ceramic filler component  220  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the ceramic filler component  220  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler component  240  may include a particular content of the third filler material. For example, the content of the third filler material may be at least about 80 vol. % for a total volume of the second ceramic filler component  240 , such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the third filler material may be not greater than about 100 vol. % for a total volume of the second ceramic filler component  240 , such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler component  240  may include a fourth filler material. 
     According to yet other embodiments, the fourth filler material of the second ceramic filler component  240  may include a particular material. For example, the fourth filler material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the fourth filler material of the second ceramic filler component  240  may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the fourth filler material of the second ceramic filler component  240  may include TiO 2 . According to still other embodiments, the fourth filler material may consist of TiO 2 . 
     According to still other embodiments, the second ceramic filler component  240  may include a particular content of the fourth filler material. For example, the content of the fourth filler material may be at least about 1 vol. % for a total volume of the second ceramic filler component  240 , such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the fourth filler material may be not greater than about 20 vol. % for a total volume of the second ceramic filler component  240 , such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the fourth filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the fourth filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second ceramic filler component  240  may include a particular content of amorphous material. For example, the second ceramic filler component  240  may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the second resin matrix component  230  may include a particular material. For example, the second resin matrix component  230  may include a perfluoropolymer. According to still other embodiments, the second resin matrix component  230  may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix component  230  may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the second resin matrix component  230  may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix component  230  may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the second resin matrix component  230  may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the second filled polymer layer  206  may include a particular content of the second resin matrix component  230 . For example, the content of the second resin matrix component  230  may be at least about 45 vol. % for a total volume of the second filled polymer layer  206 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the second resin matrix component  230  is not greater than about 63 vol. % for a total volume of the second filled polymer layer  206  or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the second resin matrix component  230  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second resin matrix component  230  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second filled polymer layer  206  may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the second filled polymer layer  206 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the second filled polymer layer  206 , such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the dielectric substrate  201  may include a particular porosity as measured using x-ray diffraction. For example, the porosity of the substrate  200  may be not greater than about 10 vol. %, such as, not greater than about 9 vol. % or not greater than about 8 vol. % or not greater than about 7 vol. % or not greater than about 6 vol. % or even not greater than about 5 vol. %. It will be appreciated that the porosity of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the porosity of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular average thickness. For example, the average thickness of the dielectric substrate  201  may be at least about 10 microns, such as, at least about 15 microns or at least about 20 microns or at least about 25 microns or at least about 30 microns or at least about 35 microns or at least about 40 microns or at least about 45 microns or at least about 50 microns or at least about 55 microns or at least about 60 microns or at least about 65 microns or at least about 70 microns or even at least about 75 microns. According to yet other embodiments, the average thickness of the dielectric substrate  201  may be not greater than about 2000 microns, such as, not greater than about 1800 microns or not greater than about 1600 microns or not greater than about 1400 microns or not greater than about 1200 microns or not greater than about 1000 microns or not greater than about 800 microns or not greater than about 600 microns or not greater than about 400 microns or not greater than about 200 microns or not greater than about 190 microns or not greater than about 180 microns or not greater than about 170 microns or not greater than about 160 microns or not greater than about 150 microns or not greater than about 140 microns or not greater than about 120 microns or even not greater than about 100 microns. It will be appreciated that the average thickness of the dielectric substrate  201  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average thickness of the dielectric substrate  201  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 20% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 80% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 20% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 80% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 20% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 80% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 20% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 80% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 20% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 80% RH. For example, the dielectric substrate  201  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  201  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  201  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  201  may have a particular coefficient of thermal expansion as measured according to IPC-TM-650 2.4.24 Rev. C Glass Transition Temperature and Z-Axis Thermal Expansion by TMA. For example, the dielectric substrate  201  may have a coefficient of thermal expansion of not greater than about 80 ppm/° C. 
     It will be appreciated that the filled polymer layers described in reference to embodiments of dielectric substrates disclosed herein may be directly in contact with the polyimide layer or there may be an additional layer in between the filled polymer layers and the polyimide layers. For example, a fluoropolymer layer (filled or unfilled) may be placed between the polyimide layer and the filled polymer layers of the dielectric substrate. 
     Turning now to embodiments of copper-clad laminates that may include dielectric substrates described herein. Such additional embodiments described herein are generally directed to a copper-clad laminate that may include a copper foil layer and a dielectric substrate overlying the copper foil layer. According to certain embodiments, the dielectric substrate may include a polyimide layer and a first filled polymer layer overlying the polyimide layer, where the first filled polymer layer may include a first resin matrix component, and a first ceramic filler component. 
     Referring next to a method of forming a copper-clad laminate,  FIG.  3    includes a diagram showing a forming method  300  for forming a copper-clad laminate according to embodiments described herein. According to particular embodiments, the forming method  300  may include a first step  310  of providing a copper foil layer, a second step  320  of forming a dielectric substrate overlying the copper foil layer. According to particular embodiments, forming the dielectric substrate may include combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and forming the first forming mixture into a first filled polymer layer overlying the polyimide layer to form the dielectric substrate. 
     According to particular embodiments, the first ceramic filler precursor component may include a first filler precursor material, which may have particular characteristics that may improve performance of the copper-clad laminate formed by the forming method  300 . 
     According to certain embodiments, the first filler precursor material may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a first filler precursor material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the first filler precursor material may have a particular size distribution D 10  value. For example, the D 10  of the first filler precursor material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the first filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may have a particular size distribution D 50  value. For example, the D 50  of the first filler precursor material may be at least about 0.5 microns, such as, at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the first filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may have a particular size distribution D 90  value. For example, the D 90  of the first filler precursor material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the first filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first filler precursor material may have a particular average particle size as measured using laser diffraction spectroscopy. For example, the mean particle size of the first filler precursor material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the first filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the first filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler precursor material may be described as having a particular particle size distribution span (PSDS), where the PSDS of the first filler precursor material is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the first filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler precursor material. For example, the PSDS of the first filler precursor material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the first filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the first filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler precursor material may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the first filler precursor material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 9.9 m 2 /g or not greater than about 9.5 m 2 /g or not greater than about 9.0 m 2 /g or not greater than about 8.5 m 2 /g or not greater than about 8.0 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the first filler precursor material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler precursor material may include a particular material. According to particular embodiments, the first filler precursor material may include a silica-based compound. According to still other embodiments, the first filler precursor material may consist of a silica-based compound. According to other embodiments, the first filler precursor material may include silica. According to still other embodiments, the first filler precursor material may consist of silica. 
     According to yet other embodiments, the first forming mixture may include a particular content of the first ceramic filler precursor component. For example, the content of the first ceramic filler precursor component may be at least about 30 vol. % for a total volume of the first forming mixture, such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the first ceramic filler precursor component may be not greater than about 57 vol. % for a total volume of the first forming mixture, such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the first ceramic filler precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first ceramic filler precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler precursor component may include a particular content of the first filler precursor material. For example, the content of the first filler precursor material may be at least about 80 vol. % for a total volume of the first ceramic filler precursor component, such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the first filler precursor material may be not greater than about 100 vol. % for a total volume of the first ceramic filler precursor component, such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the first filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler precursor component may include a second filler precursor material. 
     According to yet other embodiments, the second filler precursor material may include a particular material. For example, the second filler precursor material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the second filler precursor material may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the second filler precursor material may include TiO 2 . According to still other embodiments, the second filler precursor material may consist of TiO 2 . 
     According to still other embodiments, the first ceramic filler precursor component may include a particular content of the second filler precursor material. For example, the content of the second filler precursor material may be at least about 1 vol. % for a total volume of the first ceramic filler precursor component, such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the second filler precursor material may be not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component, such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the second filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first ceramic filler precursor component may include a particular content of amorphous material. For example, the first ceramic filler precursor component may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the first resin matrix precursor component may include a particular material. For example, the first resin matrix precursor component may include a perfluoropolymer. According to still other embodiments, the first resin matrix precursor component may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin precursor matrix component may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the first resin matrix precursor component may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix precursor component may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the first resin matrix precursor component may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the first forming mixture may include a particular content of the first resin matrix precursor component. For example, the content of the first resin matrix precursor component may be at least about 45 vol. % for a total volume of the first forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the first resin matrix precursor component is not greater than about 63 vol. % for a total volume of the first forming mixture or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the first resin matrix precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first resin matrix precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first forming mixture may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the first forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the first forming mixture, such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiment, the forming the dielectric substrate may further include combining a second resin matrix precursor component and a second ceramic filler precursor component to for a second forming mixture, and forming the second forming mixture into a second filled polymer layer underlying the polyimide layer. 
     According to particular embodiments, the second ceramic filler precursor component may include a third filler precursor material, which may have particular characteristics that may improve performance of the copper-clad laminate formed by the forming method  300 . 
     According to certain embodiments, the third filler precursor material may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a third filler precursor material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the third filler precursor material may have a particular size distribution D 10  value. For example, the D 10  of the third filler precursor material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the third filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may have a particular size distribution D 50  value. For example, the D 50  of the third filler precursor material may be at least about 0.5 microns, such as, at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the third filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may have a particular size distribution D 90  value. For example, the D 90  of the third filler precursor material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the third filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the third filler precursor material may have a particular average particle size as measured using laser diffraction spectroscopy. For example, the mean particle size of the third filler precursor material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the third filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the third filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler precursor material may be described as having a particular particle size distribution span (PSDS), where the PSDS of the third filler precursor material is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the third filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler precursor material. For example, the PSDS of the third filler precursor material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the third filler precursor material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the third filler precursor material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler precursor material may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the third filler precursor material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 9.9 m 2 /g or not greater than about 9.5 m 2 /g or not greater than about 9.0 m 2 /g or not greater than about 8.5 m 2 /g or not greater than about 8.0 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the third filler precursor material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler precursor material may include a particular material. According to particular embodiments, the third filler precursor material may include a silica-based compound. According to still other embodiments, the third filler precursor material may consist of a silica-based compound. According to other embodiments, the third filler precursor material may include silica. According to still other embodiments, the third filler precursor material may consist of silica. 
     According to yet other embodiments, the second forming mixture may include a particular content of the second ceramic filler precursor component. For example, the content of the second ceramic filler precursor component may be at least about 30 vol. % for a total volume of the second forming mixture, such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the second ceramic filler precursor component may be not greater than about 57 vol. % for a total volume of the second forming mixture, such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the second ceramic filler precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second ceramic filler precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler precursor component may include a particular content of the third filler precursor material. For example, the content of the third filler precursor material may be at least about 80 vol. % for a total volume of the second ceramic filler precursor component, such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the third filler precursor material may be not greater than about 100 vol. % for a total volume of the second ceramic filler precursor component, such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the third filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the third filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler precursor component may include a fourth filler precursor material. 
     According to yet other embodiments, the fourth filler precursor material may include a particular material. For example, the fourth filler precursor material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the fourth filler precursor material may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the fourth filler precursor material may include TiO 2 . According to still other embodiments, the fourth filler precursor material may consist of TiO 2 . 
     According to still other embodiments, the second ceramic filler precursor component may include a particular content of the fourth filler precursor material. For example, the content of the fourth filler precursor material may be at least about 1 vol. % for a total volume of the second ceramic filler precursor component, such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the fourth filler precursor material may be not greater than about 20 vol. % for a total volume of the second ceramic filler precursor component, such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the fourth filler precursor material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the fourth filler precursor material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second ceramic filler precursor component may include a particular content of amorphous material. For example, the second ceramic filler precursor component may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the second resin matrix precursor component may include a particular material. For example, the second resin matrix precursor component may include a perfluoropolymer. According to still other embodiments, the second resin matrix precursor component may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin precursor matrix component may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of polymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the second resin matrix precursor component may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix precursor component may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the second resin matrix precursor component may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the second forming mixture may include a particular content of the second resin matrix precursor component. For example, the content of the second resin matrix precursor component may be at least about 45 vol. % for a total volume of the second forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the second resin matrix precursor component is not greater than about 63 vol. % for a total volume of the second forming mixture or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the second resin matrix precursor component may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second resin matrix precursor component may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second forming mixture may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the second forming mixture, such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the second forming mixture, such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     Referring now to embodiments of the copper-clad laminate formed according to forming method  300 ,  FIG.  4   a    includes a diagram of a copper-clad lamination  400 . As shown in  FIG.  4   a   , the copper-clad laminate  400  may include a copper foil layer  403 , and a dielectric substrate  405  overlying a surface of the copper foil layer  403 . As further shown in  FIG.  4   a   , the dielectric substrate  405  may include a polyimide layer  402  and a first filled polymer layer  404  overlying the polyimide layer  402 . As shown in  FIG.  4   a   , the first filled polymer layer  404  may include a first resin matrix component  410  and a first ceramic filler component  420 . 
     According to particular embodiments, the first ceramic filler component  420  may include a first filler material, which may have particular characteristics that may improve performance of the dielectric substrate  405 . 
     According to certain embodiments, the first filler material of the first ceramic filler component  420  may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a first filler material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the first filler material of the first ceramic filler component  420  may have a particular size distribution D 10  value. For example, the D 10  of the first filler material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the first filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  420  may have a particular size distribution D 50  value. For example, the D 50  of the first filler material may be at least about 0.8 microns, such as, at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the first filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  420  may have a particular size distribution D 90  value. For example, the D 90  of the first filler material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the first filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  420  may have a particular average particle size as measured according to laser diffraction spectroscopy. For example, the mean particle size of the first filler material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the first filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the first filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  420  may be described as having a particular particle size distribution span (PSDS), where the PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. For example, the PSDS of the first filler material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the first filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the first filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the first filler material of the first ceramic filler component  420  may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the first filler material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 9.9 m 2 /g or not greater than about 9.5 m 2 /g or not greater than about 9.0 m 2 /g or not greater than about 8.5 m 2 /g or not greater than about 8.0 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the first filler material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the first filler material of the first ceramic filler component  420  may include a particular material. According to particular embodiments, the first filler material may include a silica-based compound. According to still other embodiments, the first filler material may consist of a silica-based compound. According to other embodiments, the first filler material may include silica. According to still other embodiments, the first filler material may consist of silica. 
     According to yet other embodiments, the first filled polymer layer  404  may include a particular content of the first ceramic filler component  420 . For example, the content of the first ceramic filler component  420  may be at least about 50 vol. % for a total volume of the first filled polymer layer  404 , such as, at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the ceramic filler component  220  may be not greater than about 57 vol. % for a total volume of the first filled polymer layer  404 , such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the first ceramic filler component  420  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first ceramic filler component  420  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler component  420  may include a particular content of the first filler material. For example, the content of the first filler material may be at least about 80 vol. % for a total volume of the first ceramic filler component  420 , such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the first filler material may be not greater than about 100 vol. % for a total volume of the first ceramic filler component  420 , such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the first filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the first ceramic filler component  420  may include a second filler material. 
     According to yet other embodiments, the second filler material of the first ceramic filler component  420  may include a particular material. For example, the second filler material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the second filler material of the first ceramic filler component  420  may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the second filler material of the first ceramic filler component  420  may include TiO 2 . According to still other embodiments, the second filler material may consist of TiO 2 . 
     According to still other embodiments, the first ceramic filler component  420  may include a particular content of the second filler material. For example, the content of the second filler material may be at least about 1 vol. % for a total volume of the first ceramic filler component  420 , such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the second filler material may be not greater than about 20 vol. % for a total volume of the first ceramic filler component  420 , such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the second filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first ceramic filler component  420  may include a particular content of amorphous material. For example, the first ceramic filler component  420  may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the first resin matrix component  410  may include a particular material. For example, the first resin matrix component  410  may include a perfluoropolymer. According to still other embodiments, the first resin matrix component  410  may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix component  410  may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the first resin matrix component  410  may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the first resin matrix component  410  may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the first resin matrix component  410  may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the first filled polymer layer  404  may include a particular content of the first resin matrix component  410 . For example, the content of the first resin matrix component  410  may be at least about 45 vol. % for a total volume of the first filled polymer layer  404 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the first resin matrix component  410  is not greater than about 63 vol. % for a total volume of the first filled polymer layer  404  or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the first resin matrix component  410  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the first resin matrix component  410  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the first filled polymer layer  404  may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the first filled polymer layer  404 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the first filled polymer layer  404 , such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the dielectric substrate  405  may include a particular porosity as measured using x-ray diffraction. For example, the porosity of the substrate  405  may be not greater than about 10 vol. %, such as, not greater than about 9 vol. % or not greater than about 8 vol. % or not greater than about 7 vol. % or not greater than about 6 vol. % or even not greater than about 5 vol. %. It will be appreciated that the porosity of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the porosity of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular average thickness. For example, the average thickness of the dielectric substrate  405  may be at least about 10 microns, such as, at least about 15 microns or at least about 20 microns or at least about 25 microns or at least about 30 microns or at least about 35 microns or at least about 40 microns or at least about 45 microns or at least about 50 microns or at least about 55 microns or at least about 60 microns or at least about 65 microns or at least about 70 microns or even at least about 75 microns. According to yet other embodiments, the average thickness of the dielectric substrate  405  may be not greater than about 2000 microns, such as, not greater than about 1800 microns or not greater than about 1600 microns or not greater than about 1400 microns or not greater than about 1200 microns or not greater than about 1000 microns or not greater than about 800 microns or not greater than about 600 microns or not greater than about 400 microns or not greater than about 200 microns or not greater than about 190 microns or not greater than about 180 microns or not greater than about 170 microns or not greater than about 160 microns or not greater than about 150 microns or not greater than about 140 microns or not greater than about 120 microns or even not greater than about 100 microns. It will be appreciated that the average thickness of the dielectric substrate  405  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average thickness of the dielectric substrate  405  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular coefficient of thermal expansion as measured according to IPC-TM-650 2.4.24 Rev. C Glass Transition Temperature and Z-Axis Thermal Expansion by TMA. For example, the dielectric substrate  405  may have a coefficient of thermal expansion of not greater than about 80 ppm/° C. 
     According to other embodiments of a copper-clad laminate formed according to forming method  300 ,  FIG.  4   b    includes a diagram of a copper-clad lamination  401 . As shown in  FIG.  4   a   , the copper-clad laminate  401  may include a copper foil layer  403 , and a dielectric substrate  405  overlying a surface of the copper foil layer  403 . As shown in  FIG.  4   b   , the dielectric substrate  405  may include the polyimide layer  402 , the first filled polymer layer  404  overlying the polyimide layer  402 , and a second filled polymer layer  406  underlying the polyimide layer  402 . As shown in  FIG.  4   b   , the second filled polymer layer  406  may include a second resin matrix component  430  and a second ceramic filler component  440 . 
     According to particular embodiments, the second ceramic filler component  440  may include a third filler material, which may have particular characteristics that may improve performance of the dielectric substrate  405 . 
     According to certain embodiments, the third filler material of the second ceramic filler component  440  may have a particular size distribution. For purposes of embodiments described herein, the particle size distribution of a material, for example, the particle size distribution of a third filler material may be described using any combination of particle size distribution D-values D 10 , D 50  and D 90 . The D 10  value from a particle size distribution is defined as a particle size value where 10% of the particles are smaller than the value and 90% of the particles are larger than the value. The D 50  value from a particle size distribution is defined as a particle size value where 50% of the particles are smaller than the value and 50% of the particles are larger than the value. The D 90  value from a particle size distribution is defined as a particle size value where 90% of the particles are smaller than the value and 10% of the particles are larger than the value. For purposes of embodiments described herein, particle size measurements for a particular material are made using laser diffraction spectroscopy. 
     According to certain embodiments, the third filler material of the second ceramic filler component  440  may have a particular size distribution D 10  value. For example, the D 10  of the third filler material may be at least about 0.2 microns, such as, at least about 0.3 microns or at least about 0.4 microns or at least about 0.5 microns or at least about 0.6 microns or at least about 0.7 microns or at least about 0.8 microns or at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or even at least about 1.2 microns. According to still other embodiments, the D 10  of the third filler material may be not greater than about 1.6 microns, such as, not greater than about 1.5 microns or even not greater than about 1.4 microns. It will be appreciated that the D 10  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 10  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  440  may have a particular size distribution D 50  value. For example, the D 50  of the third filler material may be at least about 0.8 microns, such as, at least about 0.9 microns or at least about 1.0 microns or at least about 1.1 microns or at least about 1.2 microns or at least about 1.3 microns or at least about 1.4 microns or at least about 1.5 microns or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or even at least about 2.2 microns. According to still other embodiments, the D 50  of the third filler material may be not greater than about 2.7 microns, such as, not greater than about 2.6 microns or not greater than about 2.5 microns or even not greater than about 2.4. It will be appreciated that the D 50  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 50  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  440  may have a particular size distribution D 90  value. For example, the D 90  of the third filler material may be at least about 0.8 microns, such as, at least about 0.9 or at least about 1.0 or at least about 1.1 or at least about 1.2 or at least about 1.3 or at least about 1.4 or at least about 1.5 or at least about 1.6 microns or at least about 1.7 microns or at least about 1.8 microns or at least about 1.9 microns or at least about 2.0 microns or at least about 2.1 microns or at least about 2.2 microns or at least about 2.3 microns or at least about 2.4 microns or at least about 2.5 microns or at least about 2.6 microns or even at least about 2.7 microns. According to still other embodiments, the D 90  of the third filler material may be not greater than about 8.0 microns, such as, not greater than about 7.5 microns or not greater than about 7.0 microns or not greater than about 6.5 microns or not greater than about 6.0 microns or not greater than about 5.5 microns or not greater than about 5.4 microns or not greater than about 5.3 microns or not greater than about 5.2 or even not greater than about 5.1 microns. It will be appreciated that the D 90  of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the D 90  of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  440  may have a particular average particle size as measured according to laser diffraction spectroscopy. For example, the mean particle size of the third filler material may be not greater than about 10 microns, such as, not greater than about 9 microns or not greater than about 8 microns or not greater than about 7 microns or not greater than about 6 microns or not greater than about 5 microns or not greater than about 4 microns or not greater than about 3 microns or even not greater than about 2 microns. It will be appreciated that the mean particle size of the third filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the mean particle size of the third filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  440  may be described as having a particular particle size distribution span (PSDS), where the PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler material, D 10  is equal to a D 10  particle size distribution measurement of the third filler material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler material. For example, the PSDS of the third filler material may be not greater than about 5, such as, not greater than about 4.5 or not greater than about 4.0 or not greater than about 3.5 or not greater than about 3.0 or even not greater than about 2.5. It will be appreciated that the PSDS of the third filler material may be any value between, and including, any of the values noted above. It will be further appreciated that the PSDS of the third filler material may be within a range between, and including, any of the values noted above. 
     According to still other embodiments, the third filler material of the second ceramic filler component  440  may be described as having a particular average surface area as measured using Brunauer-Emmett-Teller (BET) surface area analysis (Nitrogen Adsorption). For example, the third filler material may have an average surface area of not greater than about 10 m 2 /g, such as, not greater than about 9.9 m 2 /g or not greater than about 9.5 m 2 /g or not greater than about 9.0 m 2 /g or not greater than about 8.5 m 2 /g or not greater than about 8.0 m 2 /g or not greater than about 7.5 m 2 /g or not greater than about 7.0 m 2 /g or not greater than about 6.5 m 2 /g or not greater than about 6.0 m 2 /g or not greater than about 5.5 m 2 /g or not greater than about 5.0 m 2 /g or not greater than about 4.5 m 2 /g or not greater than about 4.0 m 2 /g or even not greater than about 3.5 m 2 /g. According to still other embodiments, the third filler material may have an average surface area of at least about 1.2 m 2 /g, such as, at least about 2.4 m 2 /g. It will be appreciated that the average surface area of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average surface area of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to other embodiments, the third filler material of the second ceramic filler component  440  may include a particular material. According to particular embodiments, the third filler material may include a silica-based compound. According to still other embodiments, the third filler material may consist of a silica-based compound. According to other embodiments, the third filler material may include silica. According to still other embodiments, the third filler material may consist of silica. 
     According to yet other embodiments, the first filled polymer layer  404  may include a particular content of the second ceramic filler component  440 . For example, the content of the second ceramic filler component  440  may be at least about 30 vol. % for a total volume of the first filled polymer layer  404 , such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or even at least about 54 vol. %. According to still other embodiments, the content of the second ceramic filler component  440  may be not greater than about 57 vol. % for a total volume of the first filled polymer layer  404 , such as, not greater than about 56 vol. % or even not greater than about 55 vol. %. It will be appreciated that the content of the ceramic filler component  220  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the ceramic filler component  220  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler component  440  may include a particular content of the third filler material. For example, the content of the third filler material may be at least about 80 vol. % for a total volume of the second ceramic filler component  440 , such as, at least about 81 vol. % or at least about 82 vol. % or at least about 83 vol. % or at least about 84 vol. % or at least about 85 vol. % or at least about 86 vol. % or at least about 87 vol. % or at least about 88 vol. % or at least about 89 vol. % or even at least about 90 vol. %. According to still other embodiments, the content of the third filler material may be not greater than about 100 vol. % for a total volume of the second ceramic filler component  440 , such as, not greater than about 99 vol. % or not greater than about 98 vol. % or not greater than about 97 vol. % or not greater than about 96 vol. % or not greater than about 95 vol. % or not greater than about 94 vol. % or not greater than about 93 vol. % or even not greater than about 92 vol. %. It will be appreciated that the content of the third filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the third filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the second ceramic filler component  440  may include a fourth filler material. 
     According to yet other embodiments, the fourth filler material of the second ceramic filler component  440  may include a particular material. For example, the fourth filler material may include a high dielectric constant ceramic material, such as, a ceramic material having a dielectric constant of at least about 14. According to particular embodiments, the fourth filler material of the second ceramic filler component  440  may include any high dielectric constant ceramic material, such as, TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     According to yet other embodiments, the fourth filler material of the second ceramic filler component  440  may include TiO 2 . According to still other embodiments, the fourth filler material may consist of TiO 2 . 
     According to still other embodiments, the second ceramic filler component  440  may include a particular content of the fourth filler material. For example, the content of the fourth filler material may be at least about 1 vol. % for a total volume of the second ceramic filler component  440 , such as, at least about 2 vol. % or at least about 3 vol. % or at least about 4 vol. % or at least about 5 vol. % or at least about 6 vol. % or at least about 7 vol. % or at least about 8 vol. % or at least about 9 vol. % or at least about 10 vol. %. According to still other embodiments, the content of the fourth filler material may be not greater than about 20 vol. % for a total volume of the second ceramic filler component  440 , such as, not greater than about 19 vol. % or not greater than about 18 vol. % or not greater than about 17 vol. % or not greater than about 16 vol. % or not greater than about 15 vol. % or not greater than about 14 vol. % or not greater than about 13 vol. % or not greater than about 12 vol. %. It will be appreciated that the content of the fourth filler material may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the fourth filler material may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second ceramic filler component  440  may include a particular content of amorphous material. For example, the second ceramic filler component  440  may include at least about 97% amorphous material, such as, at least about 98% or even at least about 99%. It will be appreciated that the content of amorphous material may be any value between, and including, any of the values noted above. It will be further appreciated that the content of amorphous material may be within a range between, and including, any of the values noted above. 
     According to other embodiments, the second resin matrix component  430  may include a particular material. For example, the second resin matrix component  430  may include a perfluoropolymer. According to still other embodiments, the second resin matrix component  430  may consist of a perfluoropolymer. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix component  430  may include a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. According to other embodiments, the perfluoropolymer of the second resin matrix component  430  may consist of a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     According to yet other embodiments, the perfluoropolymer of the second resin matrix component  430  may include polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. According to still other embodiments, the perfluoropolymer of the second resin matrix component  430  may consist of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     According to yet other embodiments, the first filled polymer layer  404  may include a particular content of the second resin matrix component  430 . For example, the content of the second resin matrix component  430  may be at least about 30 vol. % for a total volume of the first filled polymer layer  404 , such as, at least about 31 vol. % or at least about 32 vol. % or at least about 33 vol. % or at least about 34 vol. % or at least about 35 vol. % or at least about 36 vol. % or at least about 37 vol. % or at least about 38 vol. % or at least about 39 vol. % or at least about 40 vol. % or at least about 41 vol. % or at least about 42 vol. % or at least about 43 vol. % or at least about 44 vol. % or at least about 45 vol. % or 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the first resin matrix component  410  is not greater than about 63 vol. % for a total volume of the first filled polymer layer  404  or not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the second resin matrix component  430  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the second resin matrix component  430  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the second filled polymer layer  406  may include a particular content of the perfluoropolymer. For example, the content of the perfluoropolymer may be at least about 45 vol. % for a total volume of the second filled polymer layer  406 , such as, at least about 46 vol. % or at least about 47 vol. % or at least about 48 vol. % or at least about 49 vol. % or at least about 50 vol. % or at least about 51 vol. % or at least about 52 vol. % or at least about 53 vol. % or at least about 54 vol. % or even at least about 55 vol. %. According to still other embodiments, the content of the perfluoropolymer may be not greater than about 63 vol. % for a total volume of the second filled polymer layer  406 , such as, not greater than about 62 vol. % or not greater than about 61 vol. % or not greater than about 60 vol. % or not greater than about 59 vol. % or not greater than about 58 vol. % or even not greater than about 57 vol. %. It will be appreciated that the content of the perfluoropolymer may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the content of the perfluoropolymer may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to still other embodiments, the dielectric substrate  405  may include a particular porosity as measured using x-ray diffraction. For example, the porosity of the substrate  200  may be not greater than about 10 vol. %, such as, not greater than about 9 vol. % or not greater than about 8 vol. % or not greater than about 7 vol. % or not greater than about 6 vol. % or even not greater than about 5 vol. %. It will be appreciated that the porosity of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the porosity of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular average thickness. For example, the average thickness of the dielectric substrate  405  may be at least about 10 microns, such as, at least about 15 microns or at least about 20 microns or at least about 25 microns or at least about 30 microns or at least about 35 microns or at least about 40 microns or at least about 45 microns or at least about 50 microns or at least about 55 microns or at least about 60 microns or at least about 65 microns or at least about 70 microns or even at least about 75 microns. According to yet other embodiments, the average thickness of the dielectric substrate  405  may be not greater than about 2000 microns, such as, not greater than about 1800 microns or not greater than about 1600 microns or not greater than about 1400 microns or not greater than about 1200 microns or not greater than about 1000 microns or not greater than about 800 microns or not greater than about 600 microns or not greater than about 400 microns or not greater than about 200 microns or not greater than about 190 microns or not greater than about 180 microns or not greater than about 170 microns or not greater than about 160 microns or not greater than about 150 microns or not greater than about 140 microns or not greater than about 120 microns or even not greater than about 100 microns. It will be appreciated that the average thickness of the dielectric substrate  405  may be any value between, and including, any of the minimum and maximum values noted above. It will be further appreciated that the average thickness of the dielectric substrate  405  may be within a range between, and including, any of the minimum and maximum values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 5 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 10 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 28 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 39 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 20% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular dissipation factor (Df) as measured in the range between 76-81 GHz, 80% RH. For example, the dielectric substrate  405  may have a dissipation factor of not greater than about 0.005, such as, not greater than about 0.004 or not greater than about 0.003 or not greater than about 0.002 or not greater than about 0.0019 or not greater than about 0.0018 or not greater than about 0.0017 or not greater than about 0.0016 or not greater than about 0.0015 or not greater than about 0.0014. It will be appreciated that the dissipation factor of the dielectric substrate  405  may be any value between, and including, any of the values noted above. It will be further appreciated that the dissipation factor of the dielectric substrate  405  may be within a range between, and including, any of the values noted above. 
     According to yet other embodiments, the dielectric substrate  405  may have a particular coefficient of thermal expansion as measured according to IPC-TM-650 2.4.24 Rev. C Glass Transition Temperature and Z-Axis Thermal Expansion by TMA. For example, the dielectric substrate  405  may have a coefficient of thermal expansion of not greater than about 80 ppm/° C. 
     Referring next to a method of forming a printed circuit board,  FIG.  5    includes a diagram showing a forming method  500  for forming a printed circuit board according to embodiments described herein. According to particular embodiments, the forming method  500  may include a first step  510  of providing a copper foil layer, a second step  520  of forming a dielectric substrate overlying the copper foil layer. According to particular embodiments, forming the dielectric substrate may include combining a first resin matrix precursor component and a first ceramic filler precursor component to form a first forming mixture, and forming the first forming mixture into a first filled polymer layer overlying the polyimide layer to form the dielectric substrate. 
     It will be appreciated that all descriptions, details and characteristics provided herein in reference to forming method  100  and/or forming method  300  may further apply to or describe correspond aspects of forming method  500 . 
     Referring now to embodiments of the printed circuit board formed according to forming method  500 ,  FIG.  6   a    includes a diagram of a printed circuit board  600 . As shown in  FIG.  6   a   , the printed circuit board  600  may include a copper foil layer  603 , and a dielectric substrate  605  overlying a surface of the copper foil layer  603 . As further shown in  FIG.  6   a   , the dielectric substrate  605  may include a polyimide layer  602  and a first filled polymer layer  604  overlying the polyimide layer  602 . As shown in  FIG.  6   a   , the first filled polymer layer  604  may include a first resin matrix component  610  and a first ceramic filler component  620 . 
     Again, it will be appreciated that all descriptions provided herein in reference to dielectric substrate  200  ( 405 ) and/or copper-clad laminate  400  may further apply to correcting aspects of the printed circuit board  600 , including all component of printed circuit board  600 . 
     According to other embodiments of a printed circuit board formed according to forming method  500 ,  FIG.  6   b    includes a diagram of a printed circuit board  601 . As shown in  FIG.  6   b   , the printed circuit board  601  may include a copper foil layer  603 , and a dielectric substrate  605  overlying a surface of the copper foil layer  603 . As shown in  FIG.  6   b   , the dielectric substrate  605  may include the polyimide layer  602 , the first filled polymer layer  604  overlying the polyimide layer  602 , and a second filled polymer layer  606  underlying the polyimide layer  602 . As shown in  FIG.  6   b   , the second filled polymer layer  606  may include a second resin matrix component  630  and a second ceramic filler component  640 . 
     Again, it will be appreciated that all descriptions provided herein in reference to dielectric substrate  200  ( 405 ) and/or copper-clad laminate  400  may further apply to correcting aspects of the printed circuit board  601 , including all components of printed circuit board  601 . 
     Many different aspects and embodiments are possible. Some of those aspects and embodiments are described herein. After reading this specification, skilled artisans will appreciate that those aspects and embodiments are only illustrative and do not limit the scope of the present invention. Embodiments may be in accordance with any one or more of the embodiments as listed below. 
     Embodiment 1. A dielectric substrate comprising: a polyimide layer and a first filled polymer layer overlying the polyimide layer, wherein the first filled polymer layer comprises a first resin matrix component; and a first ceramic filler component, wherein the first ceramic filler component comprises a first filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 2. The dielectric substrate of embodiment 1, wherein a particle size distribution of the silica filler material of the first ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 3. The dielectric substrate of embodiment 1, wherein the silica filler material of the first ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 4. The dielectric substrate of embodiment 1, wherein the first filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 5. The dielectric substrate of embodiment 1, wherein the first filler material comprises a silica-based compound. 
     Embodiment 6. The dielectric substrate of embodiment 1, wherein the first filler material comprises silica. 
     Embodiment 7. The dielectric substrate of embodiment 1, wherein the first resin matrix component comprises a perfluoropolymer. 
     Embodiment 8. The dielectric substrate of embodiment 7, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 9. The dielectric substrate of embodiment 7, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 10. The dielectric substrate of embodiment 7, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 11. The dielectric substrate of embodiment 1, wherein the content of the first resin matrix component is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 12. The dielectric substrate of embodiment 1, wherein the content of the first resin matrix component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 13. The dielectric substrate of embodiment 7, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 14. The dielectric substrate of embodiment 7, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 15. The dielectric substrate of embodiment 1, wherein the content of the first ceramic filler component is at least about 30 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 16. The dielectric substrate of embodiment 1, wherein the content of the first ceramic filler component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 17. The dielectric substrate of embodiment 1, wherein the content of the first filler material is at least about 80 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 18. The dielectric substrate of embodiment 1, wherein the content of the first filler material is not greater than about 100 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 19. The dielectric substrate of embodiment 1, wherein the first ceramic filler component further comprises a second filler material. 
     Embodiment 20. The dielectric substrate of embodiment 19, wherein the second filler material of the first ceramic filler component comprises a high dielectric constant ceramic material. 
     Embodiment 21. The dielectric substrate of embodiment 20, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 22. The dielectric substrate of embodiment 20, wherein the second ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 23. The dielectric substrate of embodiment 19, wherein the content of the second filler material of the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 24. The dielectric substrate of embodiment 19, wherein the content of the second filler material of the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 25. The dielectric substrate of embodiment 22, wherein the content of the TiO 2  filler material in the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 26. The dielectric substrate of embodiment 22, wherein the content of the TiO 2  filler material in the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 27. The dielectric substrate of embodiment 1, wherein the first ceramic filler component is at least about 97%. 
     Embodiment 28. The dielectric substrate of embodiment 1, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix component; and a second ceramic filler component, wherein the second ceramic filler component comprises a silica filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 29. The dielectric substrate of embodiment 28, wherein a particle size distribution of the silica filler material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 30. The dielectric substrate of embodiment 28, wherein the silica filler material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 31. The dielectric substrate of embodiment 28, wherein the first filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 32. The dielectric substrate of embodiment 28, wherein the second filler material comprises a silica-based compound. 
     Embodiment 33. The dielectric substrate of embodiment 28, wherein the second filler material comprises silica. 
     Embodiment 34. The dielectric substrate of embodiment 28, wherein the second resin matrix comprises a perfluoropolymer. 
     Embodiment 35. The dielectric substrate of embodiment 34, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 36. The dielectric substrate of embodiment 34, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 37. The dielectric substrate of embodiment 34, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 38. The dielectric substrate of embodiment 28, wherein the content of the second resin matrix component is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 39. The dielectric substrate of embodiment 28, wherein the content of the second resin matrix component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 40. The dielectric substrate of embodiment 28, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 41. The dielectric substrate of embodiment 28, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 42. The dielectric substrate of embodiment 28, wherein the content of the second ceramic filler component is at least about 30 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 43. The dielectric substrate of embodiment 28, wherein the content of the second ceramic filler component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 44. The dielectric substrate of embodiment 28, wherein the content of the second filler material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 45. The dielectric substrate of embodiment 28, wherein the content of the second filler material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 46. The dielectric substrate of embodiment 28, wherein the second ceramic filler component further comprises a TiO 2  filler material. 
     Embodiment 47. The dielectric substrate of embodiment 46, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 48. The dielectric substrate of embodiment 46, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 49. The dielectric substrate of embodiment 28, wherein the second ceramic filler component is at least about 97% amorphous. 
     Embodiment 50. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 51. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 52. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 53. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.005. 
     Embodiment 54. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 55. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 56. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 57. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 58. The dielectric substrate of any one of embodiments 1 and 28, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     Embodiment 59. A copper-clad laminate comprising a copper foil layer, and a dielectric substrate overlying the copper foil layer, wherein the dielectric substrate comprises: a polyimide layer and a first filled polymer layer overlying the polyimide layer, wherein the first filled polymer layer comprises a first resin matrix component; and a first ceramic filler component, wherein the first ceramic filler component comprises a first filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 60. The copper-clad laminate of embodiment 59, wherein a particle size distribution of the silica filler material of the first ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 61. The copper-clad laminate of embodiment 59, wherein the silica filler material of the first ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 62. The copper-clad laminate of embodiment 59, wherein the first filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 63. The copper-clad laminate of embodiment 59, wherein the first filler material comprises a silica-based compound. 
     Embodiment 64. The copper-clad laminate of embodiment 59, wherein the first filler material comprises silica. 
     Embodiment 65. The copper-clad laminate of embodiment 59, wherein the first resin matrix component comprises a perfluoropolymer. 
     Embodiment 66. The copper-clad laminate of embodiment 65, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 67. The copper-clad laminate of embodiment 65, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 68. The copper-clad laminate of embodiment 65, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 69. The copper-clad laminate of embodiment 59, wherein the content of the first resin matrix component is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 70. The copper-clad laminate of embodiment 59, wherein the content of the first resin matrix component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 71. The copper-clad laminate of embodiment 65, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 72. The copper-clad laminate of embodiment 65, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 73. The copper-clad laminate of embodiment 59, wherein the content of the first ceramic filler component is at least about 50 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 74. The copper-clad laminate of embodiment 59, wherein the content of the first ceramic filler component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 75. The copper-clad laminate of embodiment 59, wherein the content of the first filler material is at least about 80 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 76. The copper-clad laminate of embodiment 59, wherein the content of the first filler material is not greater than about 100 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 77. The copper-clad laminate of embodiment 59, wherein the first ceramic filler component further comprises a second filler material. 
     Embodiment 78. The copper-clad laminate of embodiment 77, wherein the second filler material of the first ceramic filler component comprises a high dielectric constant ceramic material. 
     Embodiment 79. The copper-clad laminate of embodiment 78, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 80. The copper-clad laminate of embodiment 78, wherein the first ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 81. The copper-clad laminate of embodiment 77, wherein the content of the second filler material of the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 82. The copper-clad laminate of embodiment 77, wherein the content of the second filler material of the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 83. The copper-clad laminate of embodiment 80, wherein the content of the TiO 2  filler material in the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 84. The copper-clad laminate of embodiment 80, wherein the content of the TiO 2  filler material in the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 85. The copper-clad laminate of embodiment 59, wherein the first ceramic filler component is at least about 97% amorphous. 
     Embodiment 86. The copper-clad laminate of embodiment 59, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix component; and a second ceramic filler component, wherein the second ceramic filler component comprises a silica filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 87. The copper-clad laminate of embodiment 86, wherein a particle size distribution of the silica filler material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 88. The copper-clad laminate of embodiment 86, wherein the second filler material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 89. The copper-clad laminate of embodiment 86, wherein the second filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 90. The copper-clad laminate of embodiment 86, wherein the second filler material comprises a silica-based compound. 
     Embodiment 91. The copper-clad laminate of embodiment 86, wherein the second filler material comprises silica. 
     Embodiment 92. The copper-clad laminate of embodiment 86, wherein the second resin matrix comprises a perfluoropolymer. 
     Embodiment 93. The copper-clad laminate of embodiment 92, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 94. The copper-clad laminate of embodiment 92, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 95. The copper-clad laminate of embodiment 92, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 96. The copper-clad laminate of embodiment 86, wherein the content of the second resin matrix component is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 97. The copper-clad laminate of embodiment 86, wherein the content of the second resin matrix component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 98. The copper-clad laminate of embodiment 86, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 99. The copper-clad laminate of embodiment 86, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 100. The copper-clad laminate of embodiment 86, wherein the content of the second ceramic filler component is at least about 50 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 101. The copper-clad laminate of embodiment 86, wherein the content of the second ceramic filler component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 102. The copper-clad laminate of embodiment 86, wherein the content of the second filler material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 103. The copper-clad laminate of embodiment 86, wherein the content of the second filler material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 104. The copper-clad laminate of embodiment 86, wherein the second ceramic filler component further comprises a TiO 2  filler material. 
     Embodiment 105. The copper-clad laminate of embodiment 104, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 106. The copper-clad laminate of embodiment 104, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 107. The copper-clad laminate of embodiment 86, wherein the second ceramic filler component is at least about 97% amorphous. 
     Embodiment 108. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 109. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 110. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 111. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.005. 
     Embodiment 112. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 113. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 114. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 115. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 116. The copper-clad laminate of any one of embodiments 59 and 86, wherein the copper-clad laminate comprises a peel strength between the copper foil layer and the dielectric substrate of at least about 6 lb/in. 
     Embodiment 117. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a tensile strength of at least about 60 MPa. 
     Embodiment 118. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a modulus of at least about 1.3 GPa. 
     Embodiment 119. The copper-clad laminate of any one of embodiments 59 and 86, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     Embodiment 120. The copper-clad laminate of any one of embodiments 59 and 86, wherein the copper-clad laminate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 121. A printed circuit board comprising a copper-clad laminate, wherein the copper-clad laminate comprises: a copper foil layer, and a dielectric substrate overlying the copper foil layer, wherein the dielectric substrate comprises: a polyimide layer and a first filled polymer layer overlying the polyimide layer, wherein the first filled polymer layer comprises a first resin matrix component; and a first ceramic filler component, wherein the first ceramic filler component comprises a first filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 122. The printed circuit board of embodiment 121, wherein a particle size distribution of the silica filler material of the first ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 123. The printed circuit board of embodiment 121, wherein the silica filler material of the first ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 124. The printed circuit board of embodiment 121, wherein the first filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 125. The printed circuit board of embodiment 121, wherein the first filler material comprises a silica-based compound. 
     Embodiment 126. The printed circuit board of embodiment 121, wherein the first filler material comprises silica. 
     Embodiment 127. The printed circuit board of embodiment 121, wherein the first resin matrix component comprises a perfluoropolymer. 
     Embodiment 128. The printed circuit board of embodiment 127, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 129. The printed circuit board of embodiment 127, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 130. The printed circuit board of embodiment 127, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 131. The printed circuit board of embodiment 121, wherein the content of the first resin matrix component is at least about 45 vol. % for a total volume of the dielectric substrate. 
     Embodiment 132. The printed circuit board of embodiment 121, wherein the content of the first resin matrix component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 133. The printed circuit board of embodiment 127, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 134. The printed circuit board of embodiment 127, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 135. The printed circuit board of embodiment 121, wherein the content of the first ceramic filler component is at least about 30 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 136. The printed circuit board of embodiment 121, wherein the content of the first ceramic filler component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 137. The printed circuit board of embodiment 121, wherein the content of the first filler material is at least about 80 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 138. The printed circuit board of embodiment 121, wherein the content of the first filler material is not greater than about 100 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 139. The printed circuit board of embodiment 121, wherein the first ceramic filler component further comprises a second filler material. 
     Embodiment 140. The printed circuit board of embodiment 139, wherein the second filler material of the first ceramic filler component comprises a high dielectric constant ceramic material. 
     Embodiment 141. The printed circuit board of embodiment 140, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 142. The printed circuit board of embodiment 140, wherein the first ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 143. The printed circuit board of embodiment 139, wherein the content of the second filler material of the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 144. The printed circuit board of embodiment 139, wherein the content of the second filler material of the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 145. The printed circuit board of embodiment 142, wherein the content of the TiO 2  filler material in the first ceramic filler component is at least about 1 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 146. The printed circuit board of embodiment 142, wherein the content of the TiO 2  filler material in the first ceramic filler component is not greater than about 20 vol. % for a total volume of the first ceramic filler component. 
     Embodiment 147. The printed circuit board of embodiment 121, wherein the first ceramic filler component is at least about 97% amorphous. 
     Embodiment 148. The printed circuit board of embodiment 121, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix component; and a second ceramic filler component, wherein the second ceramic filler component comprises a silica filler material, and wherein the first filler material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 149. The printed circuit board of embodiment 148, wherein a particle size distribution of the silica filler material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 150. The printed circuit board of embodiment 148, wherein the second filler material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the silica filler material, D 10  is equal to a D 10  particle size distribution measurement of the first filler material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler material. 
     Embodiment 151. The printed circuit board of embodiment 148, wherein the second filler material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 152. The printed circuit board of embodiment 148, wherein the second filler material comprises a silica-based compound. 
     Embodiment 153. The printed circuit board of embodiment 148, wherein the second filler material comprises silica. 
     Embodiment 154. The printed circuit board of embodiment 148, wherein the second resin matrix comprises a perfluoropolymer. 
     Embodiment 155. The printed circuit board of embodiment 154, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 156. The printed circuit board of embodiment 154, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 157. The printed circuit board of embodiment 154, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 158. The printed circuit board of embodiment 148, wherein the content of the second resin matrix component is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 159. The printed circuit board of embodiment 148, wherein the content of the second resin matrix component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 160. The printed circuit board of embodiment 148, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 161. The printed circuit board of embodiment 148, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 162. The printed circuit board of embodiment 148, wherein the content of the second ceramic filler component is at least about 30 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 163. The printed circuit board of embodiment 148, wherein the content of the second ceramic filler component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 164. The printed circuit board of embodiment 148, wherein the content of the second filler material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 165. The printed circuit board of embodiment 148, wherein the content of the second filler material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 166. The printed circuit board of embodiment 148, wherein the second ceramic filler component further comprises a TiO 2  filler material. 
     Embodiment 167. The printed circuit board of embodiment 166, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 168. The printed circuit board of embodiment 166, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 169. The printed circuit board of embodiment 148, wherein the second ceramic filler component is at least about 97% amorphous. 
     Embodiment 170. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 171. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 172. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 173. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.005. 
     Embodiment 174. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 175. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 176. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 177. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 178. The printed circuit board of any one of embodiments 121 and 148, wherein the printed circuit board comprises a peel strength between the copper foil layer and the dielectric substrate of at least about 5 lb/in. 
     Embodiment 179. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a tensile strength of at least about 60 MPa. 
     Embodiment 180. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a modulus of at least about 1.3 GPa. 
     Embodiment 181. The printed circuit board of any one of embodiments 121 and 148, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     Embodiment 182. The printed circuit board of any one of embodiments 121 and 148, wherein The printed circuit board comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 183. A method of forming a dielectric substrate, wherein the method comprises: providing a polyimide layer; combining a first resin matrix precursor component and a first ceramic filler precursor component to form a forming mixture; and forming the forming mixture into a first filled polymer layer overlying the polyimide layer, wherein the first ceramic filler precursor component comprises a first filler precursor material, and wherein the first filler precursor material further comprises a mean particle size of not greater than about 10 microns. 
     Embodiment 184. The method of embodiment 183, wherein a particle size distribution of the first filler precursor material of the first ceramic filler precursor component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 185. The method of embodiment 183, wherein the first filler precursor material of the first ceramic filler precursor component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the first filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler precursor material. 
     Embodiment 186. The method of embodiment 183, wherein the first filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 187. The method of embodiment 183, wherein the first filler precursor material comprises a silica-based compound. 
     Embodiment 188. The method of embodiment 183, wherein the first filler precursor material comprises silica. 
     Embodiment 189. The method of embodiment 183, wherein the first resin matrix precursor component comprises a perfluoropolymer. 
     Embodiment 190. The method of embodiment 189, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 191. The method of embodiment 189, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 192. The method of embodiment 189, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 193. The method of embodiment 183, wherein the content of the first resin matrix precursor component is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 194. The method of embodiment 183, wherein the content of the first resin matrix precursor component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 195. The method of embodiment 189, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 196. The method of embodiment 189, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 197. The method of embodiment 183, wherein the content of the first ceramic filler precursor component is at least about 30 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 198. The method of embodiment 183, wherein the content of the first ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 199. The method of embodiment 183, wherein the content of the first filler precursor material is at least about 80 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 200. The method of embodiment 183, wherein the content of the first filler precursor material is not greater than about 100 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 201. The method of embodiment 183, wherein the first ceramic filler precursor component further comprises a second filler precursor material. 
     Embodiment 202. The method of embodiment 201, wherein the second filler precursor material of the first ceramic filler precursor component comprises a high dielectric constant ceramic material. 
     Embodiment 203. The method of embodiment 202, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 204. The method of embodiment 202, wherein the first ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 205. The method of embodiment 201, wherein the content of the second filler precursor material of the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 206. The method of embodiment 201, wherein the content of the second filler precursor material of the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 207. The method of embodiment 204, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 208. The method of embodiment 204, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 209. The method of embodiment 183, wherein the first ceramic filler precursor component is at least about 97% amorphous. 
     Embodiment 210. The method of embodiment 183, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix precursor component; and a second ceramic filler precursor component, wherein the second ceramic filler precursor component comprises a third filler precursor material, and wherein the third filler precursor material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 211. The method of embodiment 210, wherein a particle size distribution of the third filler precursor material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 212. The method of embodiment 210, wherein the third filler precursor material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the third filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler precursor material. 
     Embodiment 213. The method of embodiment 210, wherein the third filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 214. The method of embodiment 210, wherein the third filler precursor material comprises a silica-based compound. 
     Embodiment 215. The method of embodiment 210, wherein the third filler precursor material comprises silica. 
     Embodiment 216. The method of embodiment 210, wherein the third filler precursor material comprises a perfluoropolymer. 
     Embodiment 217. The method of embodiment 216, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 218. The method of embodiment 216, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 219. The method of embodiment 216, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 220. The method of embodiment 210, wherein the content of the second resin matrix precursor component is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 221. The method of embodiment 210, wherein the content of the second resin matrix precursor component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 222. The method of embodiment 210, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 223. The method of embodiment 210, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 224. The method of embodiment 210, wherein the content of the second ceramic filler precursor component is at least about 30 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 225. The method of embodiment 210, wherein the content of the second ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 226. The method of embodiment 210, wherein the content of the third filler precursor material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 227. The method of embodiment 210, wherein the content of the third filler precursor material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 228. The method of embodiment 210, wherein the second ceramic filler precursor component further comprises a TiO 2  filler material. 
     Embodiment 229. The method of embodiment 228, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 230. The method of embodiment 228, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 231. The method of embodiment 228, wherein the second ceramic filler precursor component is at least about 97% amorphous. 
     Embodiment 232. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 233. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 234. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 235. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.005. 
     Embodiment 236. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 237. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 238. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 239. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 240. The method of any one of embodiments 183 and 210, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     Embodiment 241. A method of forming a copper-clad laminate, wherein the method comprises providing a copper foil layer, and forming a dielectric substrate overlying the copper foil layer, wherein forming the dielectric substrate comprises: providing a polyimide layer; combining a first resin matrix precursor component and a first ceramic filler precursor component to form a forming mixture; and forming the forming mixture into a first filled polymer layer overlying the polyimide layer, wherein the first ceramic filler precursor component comprises a first filler precursor material, and wherein the first filler precursor material further comprises a mean particle size of not greater than about 10 microns. 
     Embodiment 242. The method of embodiment 241, wherein a particle size distribution of the first filler precursor material of the first ceramic filler precursor component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 243. The method of embodiment 241, wherein the first filler precursor material of the first ceramic filler precursor component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the first filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler precursor material. 
     Embodiment 244. The method of embodiment 241, wherein the first filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 245. The method of embodiment 241, wherein the first filler precursor material comprises a silica-based compound. 
     Embodiment 246. The method of embodiment 241, wherein the first filler precursor material comprises silica. 
     Embodiment 247. The method of embodiment 241, wherein the first resin matrix precursor component comprises a perfluoropolymer. 
     Embodiment 248. The method of embodiment 247, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 249. The method of embodiment 247, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 250. The method of embodiment 247, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 251. The method of embodiment 241, wherein the content of the first resin matrix precursor component is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 252. The method of embodiment 241, wherein the content of the first resin matrix precursor component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 253. The method of embodiment 247, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 254. The method of embodiment 247, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 255. The method of embodiment 241, wherein the content of the first ceramic filler precursor component is at least about 30 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 256. The method of embodiment 241, wherein the content of the first ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 257. The method of embodiment 241, wherein the content of the first filler precursor material is at least about 80 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 258. The method of embodiment 241, wherein the content of the first filler precursor material is not greater than about 100 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 259. The method of embodiment 241, wherein the first ceramic filler precursor component further comprises a second filler precursor material. 
     Embodiment 260. The method of embodiment 259, wherein the second filler precursor material of the first ceramic filler precursor component comprises a high dielectric constant ceramic material. 
     Embodiment 261. The method of embodiment 260, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 262. The method of embodiment 260, wherein the first ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 263. The method of embodiment 259, wherein the content of the second filler precursor material of the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 264. The method of embodiment 259, wherein the content of the second filler precursor material of the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 265. The method of embodiment 262, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 266. The method of embodiment 262, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 267. The method of embodiment 241, wherein the first ceramic filler precursor component is at least about 97% amorphous. 
     Embodiment 268. The method of embodiment 241, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix precursor component; and a second ceramic filler precursor component, wherein the second ceramic filler precursor component comprises a third filler precursor material, and wherein the third filler precursor material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 269. The method of embodiment 259, wherein a particle size distribution of the third filler precursor material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 270. The method of embodiment 259, wherein the third filler precursor material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the third filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler precursor material. 
     Embodiment 271. The method of embodiment 259, wherein the third filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 272. The method of embodiment 259, wherein the third filler precursor material comprises a silica-based compound. 
     Embodiment 273. The method of embodiment 259, wherein the third filler precursor material comprises silica. 
     Embodiment 274. The method of embodiment 259, wherein the third filler precursor material comprises a perfluoropolymer. 
     Embodiment 275. The method of embodiment 274, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 276. The method of embodiment 274, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 277. The method of embodiment 274, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 278. The method of embodiment 259, wherein the content of the second resin matrix precursor component is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 279. The method of embodiment 259, wherein the content of the second resin matrix precursor component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 280. The method of embodiment 259, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 281. The method of embodiment 259, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 282. The method of embodiment 259, wherein the content of the second ceramic filler precursor component is at least about 30 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 283. The method of embodiment 259, wherein the content of the second ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 284. The method of embodiment 259, wherein the content of the third filler precursor material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 285. The method of embodiment 259, wherein the content of the third filler precursor material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 286. The method of embodiment 259, wherein the second ceramic filler precursor component further comprises a TiO 2  filler material. 
     Embodiment 287. The method of embodiment 286, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 288. The method of embodiment 286, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 289. The method of embodiment 286, wherein the second ceramic filler precursor component is at least about 97% amorphous. 
     Embodiment 290. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 291. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 292. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 293. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 
     Embodiment 294. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 295. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 296. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 297. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 298. The method of any one of embodiments 241 and 259, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     Embodiment 299. A method of forming a printed circuit board, wherein the method comprises providing a copper foil layer, and forming a dielectric substrate overlying the copper foil layer, wherein forming the dielectric substrate comprises: providing a polyimide layer; combining a first resin matrix precursor component and a first ceramic filler precursor component to form a forming mixture; and forming the forming mixture into a first filled polymer layer overlying the polyimide layer, wherein the first ceramic filler precursor component comprises a first filler precursor material, and wherein the first filler precursor material further comprises a mean particle size of not greater than about 10 microns. 
     Embodiment 300. The method of embodiment 299, wherein a particle size distribution of the first filler precursor material of the first ceramic filler precursor component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 301. The method of embodiment 299, wherein the first filler precursor material of the first ceramic filler precursor component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the first filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the first filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the first filler precursor material. 
     Embodiment 302. The method of embodiment 299, wherein the first filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 303. The method of embodiment 299, wherein the first filler precursor material comprises a silica-based compound. 
     Embodiment 304. The method of embodiment 299, wherein the first filler precursor material comprises silica. 
     Embodiment 305. The method of embodiment 299, wherein the first resin matrix precursor component comprises a perfluoropolymer. 
     Embodiment 306. The method of embodiment 305, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 307. The method of embodiment 305, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 308. The method of embodiment 305, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 309. The method of embodiment 299, wherein the content of the first resin matrix precursor component is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 310. The method of embodiment 299, wherein the content of the first resin matrix precursor component is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 311. The method of embodiment 305, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 312. The method of embodiment 305, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 313. The method of embodiment 299, wherein the content of the first ceramic filler precursor component is at least about 30 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 314. The method of embodiment 299, wherein the content of the first ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the first filled polymer layer. 
     Embodiment 315. The method of embodiment 299, wherein the content of the first filler precursor material is at least about 80 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 316. The method of embodiment 299, wherein the content of the first filler precursor material is not greater than about 100 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 317. The method of embodiment 299, wherein the first ceramic filler precursor component further comprises a second filler precursor material. 
     Embodiment 318. The method of embodiment 317, wherein the second filler precursor material of the first ceramic filler precursor component comprises a high dielectric constant ceramic material. 
     Embodiment 319. The method of embodiment 318, wherein the high dielectric constant ceramic material has a dielectric constant of at least about 14. 
     Embodiment 320. The method of embodiment 318, wherein the first ceramic filler component further comprises TiO 2 , SrTiO 3 , ZrTi 2 O 6 , MgTiO 3 , CaTiO 3 , BaTiO 4  or any combination thereof. 
     Embodiment 321. The method of embodiment 317, wherein the content of the second filler precursor material of the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 322. The method of embodiment 317, wherein the content of the second filler precursor material of the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 323. The method of embodiment 318, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is at least about 1 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 324. The method of embodiment 318, wherein the content of the TiO 2  filler material in the first ceramic filler precursor component is not greater than about 20 vol. % for a total volume of the first ceramic filler precursor component. 
     Embodiment 325. The method of embodiment 299, wherein the first ceramic filler precursor component is at least about 97% amorphous. 
     Embodiment 326. The method of embodiment 299, wherein the dielectric substrate further comprises a second filled polymer layer underlying the polyimide layer, wherein the second filled polymer layer comprises a second resin matrix precursor component; and a second ceramic filler precursor component, wherein the second ceramic filler precursor component comprises a third filler precursor material, and wherein the third filler precursor material further comprises a mean particle size of at not greater than about 10 microns. 
     Embodiment 327. The method of embodiment 317, wherein a particle size distribution of the third filler precursor material of the second ceramic filler component comprises: a D 10  of at least about 0.2 microns and not greater than about 1.6, a D 50  of at least about 0.5 microns and not greater than about 2.7 microns, and a D 90  of at least about 0.8 microns and not greater than about 4.7 microns. 
     Embodiment 328. The method of embodiment 317, wherein the third filler precursor material of the second ceramic filler component comprises a particle size distribution span (PSDS) of not greater than about 8, where PSDS is equal to (D 90 −D 10 )/D 50 , where D 90  is equal to a D 90  particle size distribution measurement of the third filler precursor material, D 10  is equal to a D 10  particle size distribution measurement of the third filler precursor material, and D 50  is equal to a D 50  particle size distribution measurement of the third filler precursor material. 
     Embodiment 329. The method of embodiment 317, wherein the third filler precursor material further comprises an average surface area of not greater than about 10 m 2 /g. 
     Embodiment 330. The method of embodiment 317, wherein the third filler precursor material comprises a silica-based compound. 
     Embodiment 331. The method of embodiment 317, wherein the third filler precursor material comprises silica. 
     Embodiment 332. The method of embodiment 317, wherein the third filler precursor material comprises a perfluoropolymer. 
     Embodiment 333. The method of embodiment 332, wherein the perfluoropolymer comprises a copolymer of tetrafluoroethylene (TFE); a copolymer of hexafluoropropylene (HFP); a terpolymer of tetrafluoroethylene (TFE); or any combination thereof. 
     Embodiment 334. The method of embodiment 332, wherein the perfluoropolymer comprises polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 335. The method of embodiment 332, wherein the perfluoropolymer consists of polytetrafluoroethylene (PTFE), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene propylene (FEP), or any combination thereof. 
     Embodiment 336. The method of embodiment 317, wherein the content of the second resin matrix precursor component is at least about 50 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 337. The method of embodiment 317, wherein the content of the second resin matrix precursor component is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 338. The method of embodiment 317, wherein the content of the perfluoropolymer is at least about 45 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 339. The method of embodiment 317, wherein the content of the perfluoropolymer is not greater than about 63 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 340. The method of embodiment 317, wherein the content of the second ceramic filler precursor component is at least about 30 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 341. The method of embodiment 317, wherein the content of the second ceramic filler precursor component is not greater than about 57 vol. % for a total volume of the second filled polymer layer. 
     Embodiment 342. The method of embodiment 317, wherein the content of the third filler precursor material is at least about 80 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 343. The method of embodiment 317, wherein the content of the third filler precursor material is not greater than about 100 vol. % for a total volume of the second ceramic filler component. 
     Embodiment 344. The method of embodiment 317, wherein the second ceramic filler precursor component further comprises a TiO 2  filler material. 
     Embodiment 345. The method of embodiment 344, wherein the content of the TiO 2  filler material is at least about 1 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 346. The method of embodiment 344, wherein the content of the TiO 2  filler material is not greater than about 20 vol. % for a total volume of the second ceramic filler precursor component. 
     Embodiment 347. The method of embodiment 344, wherein the second ceramic filler precursor component is at least about 97% amorphous or at least about 98% or at least about 99%. 
     Embodiment 348. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a porosity of not greater than about 10 vol. %. 
     Embodiment 349. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises an average thickness of at least about 10 microns. 
     Embodiment 350. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises an average thickness of not greater than about 200 microns. 
     Embodiment 351. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.005. 
     Embodiment 352. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a dissipation factor (5 GHz, 20% RH) of not greater than about 0.0014. 
     Embodiment 353. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a coefficient of thermal expansion (x/y axe) of not greater than about 80 ppm/° C. 
     Embodiment 354. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a peel strength between the first filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 355. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a peel strength between the second filled polymer layer and the polyimide layer of at least about 5 lb/in. 
     Embodiment 356. The method of any one of embodiments 299 and 317, wherein the dielectric substrate comprises a moisture absorption of not greater than about 1.2%. 
     EXAMPLES 
     The concepts described herein will be further described in the following Examples, which do not limit the scope of the invention described in the claims. 
     Example 1 
     Sample dielectric substrates S1-S8 were configured and formed according to certain embodiments described herein. Each sample dielectric substrate includes a polyimide layer, a first filled polymer layer overlying a first surface of the polyimide layer, and a second filled polymer layer underlying a second surface of the polyimide layer. The resin matrix component for each filled polymer layer of the sample dielectric substrates S1-S8 is a fluoropolymer or combination of fluoropolymers. The ceramic-filled component for each filled polymer layer of the sample dielectric substrates S1-S7 is silica-based component type A and the ceramic-filled component for each filled polymer layer of the sample dielectric substrate S8 is silica-based component type B. The composition of each filled polymer layer is 45.6 vol. % resin matrix component and 54.4 vol. % ceramic filler component. 
     Characteristics, including particle size distribution measurements (i.e., D 10 , D 50  &amp; D 90 ), particle size distribution span, mean particle size, and BET surface area, of the silica-based component types used in the sample dielectric substrates S1-S8 are summarized in Table 1 below. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Silica-Based Component Characteristics 
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                 Mean 
                 BET 
               
               
                 Silica-Based 
                   
                   
                   
                 PSDS 
                 Particle 
                 Surface 
               
               
                 Component 
                 D 10   
                 D 50   
                 D 90   
                 (D 90  − 
                 Size 
                 Area 
               
               
                 Type 
                 (μm) 
                 (μm) 
                 (μm) 
                 D 10 )/D 50   
                 (μm) 
                 (m 2 /g) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 A 
                 1.3 
                 2.3 
                 3.9 
                 1.13 
                 2.3-3.0 
                 2.2-2.5 
               
               
                 B 
                 0.5 
                 1.1 
                 1.6 
                 1.0 
                 1.0-1.9 
                 6.1 
               
               
                   
               
            
           
         
       
     
     Performance properties of each sample dielectric substrates S1-S8 are summarized in Table 2 below. The summarized performance properties include the permittivity of the sample dielectric substrate measured at 5 GHz (“Dk (5 GHz)”), the loss tangent of the substrate measured at 5 GHz, 20% RH (“Df (5 GHz, 20% RH)”), the loss tangent of the sample dielectric substrate measured at 5 GHz, 80% RH (“Df (5 GHz, 80% RH)”), and the coefficient of thermal expansion of the sample dielectric substrate (“CTE”). 
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Performance Properties 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 Sample 
                 Dk  
                 Df (5 GHz,  
                 Df (5 GHz,  
                 CTE  
               
               
                   
                 No. 
                 (5 GHz) 
                 20% RH) 
                 80% RH) 
                 (ppm/° C.) 
               
               
                   
                   
               
               
                   
                 S1 
                 3.15 
                 0.0010 
                 0.00300 
                 17 
               
               
                   
                 S2 
                 3.08 
                 00010  
                 0.00250 
                 14 
               
               
                   
                 S3 
                 3.28 
                 0.0014 
                 0.00330 
                 12 
               
               
                   
                 S4 
                 3.03 
                 0.0014 
                 0.00260 
                 — 
               
               
                   
                 S5 
                 3.10 
                 0.0010 
                 0.00200 
                 — 
               
               
                   
                 S6 
                 3.02 
                 0.0016 
                 0.00230 
                 — 
               
               
                   
                 S7 
                 3.09 
                 0.0016 
                 000230  
                 — 
               
               
                   
                 S8 
                 3.17 
                 0.0018 
                 0.00240 
                 — 
               
               
                   
                   
               
            
           
         
       
     
     Note that not all of the activities described above in the general description or the examples are required, that a portion of a specific activity may not be required, and that one or more further activities may be performed in addition to those described. Still further, the order in which activities are listed is not necessarily the order in which they are performed. 
     Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any feature(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature of any or all the claims. 
     The specification and illustrations of the embodiments described herein are intended to provide a general understanding of the structure of the various embodiments. The specification and illustrations are not intended to serve as an exhaustive and comprehensive description of all of the elements and features of apparatus and systems that use the structures or methods described herein. Separate embodiments may also be provided in combination in a single embodiment, and conversely, various features that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any subcombination. Further, reference to values stated in ranges includes each and every value within that range. Many other embodiments may be apparent to skilled artisans only after reading this specification. Other embodiments may be used and derived from the disclosure, such that a structural substitution, logical substitution, or another change may be made without departing from the scope of the disclosure. Accordingly, the disclosure is to be regarded as illustrative rather than restrictive.