Patent Publication Number: US-2023154862-A1

Title: 3D-Interconnect with Electromagnetic Interference (&#34;EMI&#34;) Shield and/or Antenna

Description:
BACKGROUND OF THE INVENTION 
     The subject matter of the present application relates to microelectronic assemblies and fabrication methods, and more particularly to the structure of and fabrication method for conductive components in a low-profile microelectronic package assembly that include electromagnetic interference (“EMI”) structures and/or antennas. 
     Semiconductor chips are commonly provided as individual, prepackaged units. A standard chip has a flat, rectangular body with a large front face having contacts connected to the internal circuitry of the chip. Each individual chip typically is mounted in a package which, in turn, is mounted on a circuit panel such as a printed circuit board and which connects the contacts of the chip to conductors of the circuit panel. 
     Each chip package has many electrical connections for carrying signals, power and ground between terminals and the chips therein. The electrical connections can include different kinds of conductors such as horizontal conductors, e.g., traces, beam leads, etc., which extend in a horizontal direction relative to a contact-bearing surface of a chip, vertical conductors such as vias, which extend in a vertical direction relative to the surface of the chip, and wire bonds which extend in both horizontal and vertical directions relative to the surface of the chip. 
     Additional components may be provided within the package, including antennas and EMI shields. EMI shields can be implemented to assist with shielding of electromagnetic interference that may be transmitted through the air. Antennas can be used to receive or transmit signals. Such EMI shields and antennas are commonly plated onto surfaces of the microelectronic assembly. 
     In many conventional designs, the chip package occupies an area of the circuit panel considerably larger than the area of the chip itself. In some designs which are referred to as “flip chip” designs, the front face of the chip confronts the face of a package substrate, and the contacts on the chip are bonded directly to contacts of the package substrate by solder balls or other connecting elements. In turn, the package substrate can be bonded to a circuit panel through terminals overlying the front face of the chip. 
     In light of the foregoing, certain improvements can be made in the structure of microelectronic packages and assemblies which comprise a microelectronic package. In this regard, there remains a need for improved packages that are reliable, thin, testable and economical to manufacture. 
     BRIEF SUMMARY OF THE EMBODIMENTS 
     According to a first aspect to the disclosure, a method of manufacturing a microelectronic package with an integrally formed electromagnetic interference (“EMI”) shield structure is disclosed. The method comprises patterning a conductive structure to comprise a base, a plurality of interconnection elements extending continuously away from the base, and a recessed or die attach area sized to receive a microelectronic element, wherein some of the plurality of interconnection elements are EMI shield interconnection elements that extend around a perimeter of the recessed or die attach area; bonding ends of the plurality of interconnection elements and the EMI shield interconnection elements to a carrier so that a microelectronic element disposed on the carrier is positioned within the recessed or die attach area and so that the EMI shield interconnection elements are laterally adjacent and extend around the microelectronic element, wherein the patterning further comprises patterning the plurality of EMI shield interconnection elements so that the EMI shield interconnection elements are spaced around the microelectronic element to form a first portion of the EMI shield structure; encapsulating the plurality of interconnection elements, the EMI shield interconnection elements, and the microelectronic element with an encapsulant and so that the an outer surface of the conductive structure remains exposed; removing the carrier to expose free ends of the plurality of interconnection elements and the EMI shield interconnection elements; and patterning the exposed outer surface of the conductive structure overlying the microelectronic element to form a second portion of the EMI shield structure, and so that the second portion of the EMI shield structure extends continuously away from and is integrally formed with the first portion of the EMI shield structure. 
     According to a second aspect of the disclosure, a microelectronic assembly comprises a microelectronic element, a plurality of back side conductive components, and an encapsulant. The microelectronic element may have an active front surface, an opposed rear surface, and opposed edge surfaces extending between the front and rear surfaces. At least some of the plurality of back side conductive components are EMI shield back side conductive components, which further comprise EMI shield interconnection elements and at least one EMI shield back side routing line. The EMI shield back side conductive components form an EMI shield structure around the microelectronic element. An encapsulant surrounds at least the opposed edge surfaces of the microelectronic element and the EMI shield interconnection elements. The EMI shield interconnection elements are configured to form a first portion of the EMI shield structure, wherein the at least one EMI shield back side routing line overlies the rear surface of the microelectronic element and forms a second portion of the EMI shield structure. The at least one back side routing line extends continuously from the EMI shield interconnection elements and along a surface of the encapsulant. 
     According to a third aspect of the disclosure, a system comprises the assembly according to the second aspect, and one or more other electronic components electrically connected to the assembly. 
     According to a fourth aspect of the disclosure, a method of manufacturing a microelectronic package with an integrally formed antenna, comprises patterning a conductive structure to form a base, a plurality of interconnection elements extending continuously away from the base, and a recessed or die attach area sized to receive a microelectronic element; bonding ends of the plurality of interconnection elements to a carrier so that a microelectronic element disposed on the carrier is positioned within the recessed or die attach area; encapsulating the plurality of interconnection elements and the microelectronic element with an encapsulant and so that an outer surface of the conductive structure remains exposed; removing the carrier to expose free ends of the plurality of interconnection elements; and patterning the exposed outer surface of the conductive structure to expose a surface of the encapsulant and to include a plurality of conductive back side routing lines extending continuously from and integrally formed with the plurality of interconnection elements, the plurality of conductive back side routing lines extending across the surface of the encapsulant. A first back side conductive routing line of the plurality of conductive back side routing lines is patterned into an antenna routing line to form an antenna. A second back side conductive routing line of the plurality of conductive back side routing lines is patterned into a trace that can carry one of a signal, ground, or power. 
     A fifth aspect of the disclosure is directed to a microelectronic assembly that comprises a microelectronic element, a plurality of back side conductive components, and an encapsulant. The microelectronic element comprises an active front surface, an opposed rear surface, and opposed edge surfaces extending between the front and rear surfaces. Each of the plurality of back side conductive components comprising an interconnection element and a back side routing line integrally formed with and connected to the interconnection element. The encapsulant surrounds the microelectronic element and edges of the plurality of back side conductive components. A first back side routing line of a first back side conductive component comprises an antenna pattern. A second back side routing line of a second back side conductive component comprises a trace that provides a conductive connection for one of a power, a ground, or a signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings show exemplary embodiments in accordance with one or more aspects of exemplary assemblies and methods. However, these drawings should not be considered as limiting the scope of the claims, but provide examples that are for explanation and understanding only. 
         FIG.  1    is a schematic cross-sectional view of an example microelectronic assembly in accordance with aspects of the disclosure. 
         FIG.  2    is a schematic perspective cross-sectional view of an example portion of the microelectronic assembly of  FIG.  1   . 
         FIG.  3    is a schematic cross-sectional view of an example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  3 A  is a schematic cross-sectional view of an example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  4    is a schematic cross-sectional view of an example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  5    is a schematic cross-sectional view of another example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  6    is a schematic perspective cross-sectional view of an example portion of the microelectronic assembly of  FIG.  5   . 
         FIG.  7    is a schematic cross-sectional view of an example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  8    is a schematic perspective cross-sectional view of an example portion of the microelectronic assembly of  FIG.  7   . 
         FIG.  9    is a schematic cross-sectional view of an example microelectronic assembly in accordance with another aspect of the disclosure. 
         FIG.  10    is a schematic perspective cross-sectional view of an example portion of the microelectronic assembly of  FIG.  9   . 
         FIGS.  11 A- 11 K  are schematic cross-sectional and top views showing an example method of making the microelectronic assembly of  FIG.  1    in accordance with aspects of the disclosure. 
         FIG.  12    is a top view of an alternate method of patterning an EMI shield structure according to an aspect of the disclosure. 
         FIG.  13    is a top view of another alternative method of patterning an EMI shield structure according to an aspect of the disclosure. 
         FIGS.  14 A- 14 L  illustrate schematic cross-sectional and top views of an example method of making the microelectronic assembly of  FIGS.  7 - 8   . 
         FIG.  15    is an example method of manufacturing a microelectronic assembly in accordance with aspects of the disclosure. 
         FIG.  16    is an example method of manufacturing a microelectronic assembly in accordance with aspects of the disclosure. 
         FIG.  17    is a schematic depiction of a system according to one embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     According to aspects of the disclosure, a microelectronic assembly can include a plurality of back side conductive components, some of which are arranged to form at least part of an electromagnetic interference (“EMI”) shield structure. The EMI shield structure may extend around or adjacent to one or more surfaces of a microelectronic element, such as an active or passive semiconductor device. The EMI shield structure can contain electromagnetic waves generated by the microelectronic element within the EMI shield structure so as to shield other components within the assembly from the electromagnetic waves. This also shields the microelectronic element within the EMI shield structure from electromagnetic waves generated by other components within the assembly. The back side conductive components forming the EMI shield may be further comprised of a back side routing layer that overlies a microelectronic element and that is integrally connected to at least one interconnection element. Formation of the EMI shield structure with integrally formed EMI back side conductive components according to aspects of the disclosure can simplify the manufacturing process, as well as improve package warpage, small form factor, and various other improvements, all of which help to reduce the overall cost of the assembly. 
     The back side conductive components can additionally or alternatively be arranged on the microelectronic assembly to form one or more antennas. For example, a back side routing layer can be patterned to extend across a rear surface of the encapsulant to form an antenna. In some examples, the antenna can be patterned to overlie at least a portion of a microelectronic element. 
       FIGS.  1 - 2    illustrate one example microelectronic assembly  100  having a plurality of back side conductive components in which some of the back side conductive components are arranged to form at least part of an EMI shield structure.  FIG.  1    is a cross-sectional view that includes the portion taken across the “ FIG.  1   ” line identified in  FIG.  2   .  FIG.  2    is a schematic perspective view of a portion of the microelectronic assembly within the area of the microelectronic assembly identified in  FIG.  1   .  FIG.  2    particularly illustrates a perspective cross-sectional view of an example EMI shield structure  102  that encompasses a microelectronic element  120 . As shown in  FIG.  2   , a first set of example back side conductive components  110 A,  110 B are arranged to overlie the microelectronic element and form at least part of the EMI shield structure  102 . Another set of example back side conductive components  110  are shown in  FIG.  1    and positioned outside of or adjacent the EMI shield structure. The plurality of back side conductive components  110 ,  110 A,  110 B will be discussed in further detail herein. 
     The microelectronic assembly  100  may further include an encapsulated microelectronic element  120  having an active front surface  124  and an opposed rear surface  128 , as well as an optional redistribution structure  140  having a front surface  146  and a rear surface  150  opposite from the front surface  146 . Each of the back side conductive components  110 ,  110 A,  110 B in the microelectronic assembly  100  may be simultaneously formed from an integral or continuous unitary structure ( FIGS.  11 A- 11 C ) that is at least partially pre-processed prior to encapsulation within the assembly  100 . 
     Referring first to the back side conductive components  110  that do not form part of the EMI shield structure, the back side conductive components  110  may be formed from at least one interconnection element that is integrally formed with at least one back side routing layer or line. For example, each of the back side conductive components  110  are shown to include an interconnection element  114  and a back side routing line  112  that extend along an axis parallel to the front and rear surfaces  124 ,  128  of the microelectronic element  120 . The interconnection elements  114  can extend away from and in a direction vertical to the back side routing layers  112 . 
     Back side conductive components  110 A,  110 B may be constructed and arranged to form an EMI shield structure. An example arrangement of back side conductive components is shown in  FIG.  2   , which collectively create EMI shield structure  102 . EMI shield structure may be similar to an EMI shield or Faraday cage, but other types of EMI shield structures, including those that do not completely surround a microelectronic element or device, are contemplated within the scope of the disclosure. To facilitate discussion, the back side conductive components forming the EMI shield structure  102  will also be further referred to as EMI shield back side conductive components  110 A,  110 B. The EMI shield back side conductive components  110 A,  110 B will be similarly formed from an integrally-formed EMI shield back side routing layer  104  (which further includes routing lines) and one or more interconnection elements  114  that are arranged to extend around microelectronic element  120  to contain electromagnetic waves generated by microelectronic element  120 , as well as protect microelectronic element  120  from electromagnetic waves generated outside of the EMI shield structure. 
     With reference to both  FIGS.  1 - 2   , the EMI shield back side conductive component  110 A can include, for example, one back side routing line  104   a  that is connected to a first interconnection element  114   a   1  at one end and a second interconnection element  114   a   2  at an opposed end. With reference to  FIG.  2   , the EMI shield back side conductive component  110 B can similarly include one back side routing line  104   b  that is integrally connected to a first interconnection element  114   b   1  at one end and a second interconnection element  114   b   2  at an opposed end. In other examples, one or more of the EMI shield back side routing lines  104   a ,  104   b  need only be joined to one interconnection element. As will be discussed, the arrangement of the EMI shield back side conductive components  110 A,  110 B relative to one another can form the EMI shield structure. 
     The back side conductive components, including back side conductive components  110  and EMI shield back side conductive components  110 A,  110 B, can be concurrently formed at the same time and from the same conductive structure as will be further discussed in  FIGS.  11 A- 11 C . The EMI shield back side conductive components  110 A,  110 B ( FIG.  2   ) that form the EMI shield structure and the remaining back side conductive components  110  that do not form the EMI shield structure are otherwise similar. The back side conductive components  110 ,  110 A,  110 B can further provide interconnections between the microelectronic element  120  and other components within the assembly  100  or external to the assembly  100 . 
     With the back side conductive components  110 ,  110 A,  110 B being formed at the same time, the back side conductive components  110 ,  110 A,  110 B may be formed from materials that are conductive and can carry a grounded shield. In some examples, ferromagnetic materials and/or ferromagnetic alloys may be used, such as iron, cobalt, and/or nickel. In other examples, other materials may be used, including copper, aluminum, solder, tungsten, cobalt, palladium, gold, silver, and/or their respective alloys. 
     The EMI shield structure can be positioned adjacent at least one surface of microelectronic element  120 . In this example, EMI shield structure  102  extends around the periphery of the microelectronic  120 . As shown, EMI shield structure  102  may be formed from a plurality of EMI shield back side conductive components  110 A,  110 B, with EMI shield back side conductive components  110 A being positioned perpendicular to EMI shield back side conductive components  110 B. In one example, the EMI shield structure  102  can extend along a plane parallel to and overlie the rear surface  128  of microelectronic element  120 . EMI shield structure  102  can further extends around a first set of opposed lateral edge surfaces  126   a ,  126   b  and a second set of opposed lateral edge surfaces  126   c ,  126   d  that extend between the rear surface  123  and opposed front surface  124  of the microelectronic element  120 . 
     A plurality of EMI shield interconnection elements  114   a  form a first portion of EMI shield structure  102  and can extend around the lateral edge surfaces  126   a ,  126   b ,  126   c ,  126   d  of the microelectronic element  120 . The vertical height Hv ( FIG.  2   ) of the plurality of interconnection elements may extend from at least the front surface  124  to the rear surface  128  of the microelectronic element  120 . This arrangement of EMI shield interconnection elements  114   a  provides EMI shielding around the lateral edge surfaces  126   a ,  126   b ,  126   c ,  126   d . According to one example, the interconnection elements  114  only extend in a vertical direction such that there are no conductive connections that extend laterally between and interconnect two adjacent interconnection elements  114   a   1  and/or  114   a   2 . In other examples, additional lateral interconnection may exist between two adjacent interconnection elements  114   a   1  and/or  114   a   2 . 
     The EMI shield interconnection elements  114   a   1  may be laterally spaced apart from one another a pre-determined width or pitch to create EMI shielding around the microelectronic element  120 , and particularly lateral EMI shielding around the peripheral edges  126   a ,  126   b ,  126   c ,  126   d  of the microelectronic element  120 . Depending on the level of shielding desired, the EMI shield interconnection elements  114   a   1  may be spaced closer together or further apart. For example, as shown in  FIG.  2   , a center-to-center pitch P between two directly adjacent EMI shield interconnection elements  114   a   1 , in an array may range from 100 μm to 1 mm. But, in other examples, the pitch may be less than 100 μm or greater than 1 mm. In one example, the pitch may be 300 μm. In still other examples, the pitch may be at least 300 μm. The pitch between two adjacent EMI shield interconnection elements  114   a   1  may be the same for some or all EMI shield interconnection elements  114   a   1  or can differ throughout. The interconnection elements  114   a   2 ,  114   b   1 ,  114   b   2  may have similar pitches. 
     EMI shield back side routing layer  104  may form a second portion of the EMI shield structure  102 . EMI shield back side routing layer  104  can overlie the rear surface  128  of the microelectronic element  120  and extend along an axis parallel to the front and rear surfaces of the microelectronic element  120 . In one example, EMI shield back side routing layer  104  overlies the top surface  136  of the encapsulant  134 , as well as the rear surface  128  of the microelectronic element  120 . As shown, the back side routing layer  104  may be formed in a grid or mesh-like pattern, such that the EMI shield back side routing layer  104  includes routing lines that extend in directions parallel and perpendicular to one another. As shown, horizontal back side routing lines  104   a  extend continuously from a first EMI shield interconnection element  114   a   1  adjacent lateral edge  126   a , across rear surface  128  of microelectronic element  120 , and to a second interconnection element  114   a   2  adjacent lateral edge  126   b . In this example, the horizontal back side routing lines  104   a  extend beyond lateral edges  126   a ,  126   b  of microelectronic element  120 . Perpendicular back side routing lines  104   b  extend in a direction perpendicular to the horizontal back side routing lines  104   a , such that the back side routing lines  104   b  intersect with the horizontal back side routing lines  104   a . As shown, the perpendicular back side routing lines  104   b  extend continuously from EMI shield interconnection elements  114   b   1  adjacent lateral edge  126   c , across rear surface  128  of microelectronic element  120 , and to EMI shield interconnection elements  114   b   2  that are adjacent lateral edge  126   d . In this example, the perpendicular back side routing lines  104   b  also extend beyond lateral edges  126   c ,  126   d  of microelectronic element  120 . 
     A manufacturing process that incorporates back side conductive components  110 , including EMI shield back side conductive components  110 A,  110 B integrally formed at the same time from a pre-processed unitary structure, as opposed to being formed by plating conductive vias or the like, allows for improvements over known assemblies, including a reduction in the overall cost of the assembly, simplified fabrication, improvements on package warpage, small form factor, and various other improvements. 
     The microelectronic element  120  can be a semiconductor chip having a plurality of bond pads  122  at its front surface  124 . Each microelectronic element  120  also includes a rear surface  128  opposite from its front surface  124 . Edge surfaces  126   a ,  126   b ,  126   c ,  126   d  of the microelectronic element may extend away from the front surface  124  of the microelectronic element  120  and between the front surface  124  and rear surface  128 . 
     In one example, the microelectronic element  120  may be a semiconductor chip having one or more memory storage arrays, which may include a particular memory type such as nonvolatile memory. Nonvolatile memory can be implemented in a variety of technologies some of which include memory cells that incorporate floating gates, such as, for example, flash memory, and others which include memory cells which operate based on magnetic polarities. Flash memory chips are currently in widespread use as solid state storage as an alternative to magnetic fixed disk drives for computing and mobile devices. Flash memory chips are also commonly used in portable and readily interchangeable memory drives and cards, such as Universal Serial Bus (USB) memory drives, and memory cards such as Secure Digital or SD cards, microSD cards (trademarks or registered trademarks of SD- 3 C), compact flash or CF card and the like. Flash memory chips typically have NAND or NOR flash type devices therein; NAND type devices are more common. Other examples of semiconductor chips are one or more DRAM, NOR, microprocessor, controller die, etc. or combinations thereof. Each semiconductor chip may be implemented in one of various semiconductor materials such as silicon, germanium, and gallium arsenide or one or more other Group III-V semiconductor compounds or Group II-VI semiconductor compounds, etc. 
     The EMI shield structure  102  in this example is shown extending around and adjacent to all surfaces of the microelectronic element  120 , except for the front surface  124  of the microelectronic  120 . In other examples, the EMI shield structure  102  may extend adjacent only one surface, or may extend adjacent to more than one surface, such as two, three, four, five, or six surfaces. For example, the EMI shield structure may only extend adjacent one of the edge surfaces  126   a ,  126   b ,  126   c ,  126   d  of the microelectronic element  120  that extend between the rear surface  128  and front surface  124  of the microelectronic element  120 . In such example, only the interconnection components, such as interconnection elements  114   a   1 ,  114   a   2  would extend directly adjacent one of the edge surfaces of the microelectronic element  120  and no back side routing layer would be patterned to overlie the microelectronic element. In another example, an EMI shield structure  102  may instead only overlie the rear surface  128  of the microelectronic element  120 , such that only the back side routing layer overlies at least a portion of the rear surface  128  of the microelectronic element  120  and the interconnection elements  114   a   1 ,  114   a   2  are not positioned directly adjacent the edge surfaces  126   a ,  126   b ,  126   c ,  126   d  of the microelectronic element  120 . 
     Although only one microelectronic element  120  is illustrated in this configuration, in other examples, one or more microelectronic elements  120  may be contained within the EMI shield structure  102 . In still other examples, one or more passive components may be additionally or alternatively provided within the EMI shield structure  102 . For example, the microelectronic element  120  can be a passive device or in another example, the microelectronic element  120  may be an active device and an additional passive device may be positioned within the EMI shield structure  102 . Multiple EMI shield structures  102  can also be positioned within the overall microelectronic assembly  100 , some or all of which contain one or more multiple microelectronic elements  120  within the EMI shield structure  102 . 
     The microelectronic element  120  and each of the interconnection elements  114  of the back side conductive components  110 ,  110 A,  110 B may be encapsulated within an encapsulant  134 . The back side routing layer  112  of the back side conductive components  110  that do not form part of the EMI shield structure  102 , as well as the EMI shield back side routing layer  104  can overlie the top surface  136  of the encapsulant  134 . In this example, EMI shield back side routing layer  104  of the EMI shield back side conductive components  110 A,  110 B, and the other back side routing layer  112  of the other back side conductive components  110  can further extend along the top surface  136  of the encapsulant  134 . Ends  116  of the interconnection elements  114  can be positioned adjacent the bottom surface  138  of the encapsulant  134 . 
     In particular embodiments, the material forming the encapsulant  134  can be an epoxy-based polymer system with fillers, overmold, or potting compound. Such compound can provide stiffness to the overall assembly  100  to withstand internal differential thermal expansion between the assembly  100  and other components within the assembly. The compound may in some cases provide protection from shorting and moisture and/or water resistance. Such material can further help to provide a relatively rigid encapsulation which supports planarity of the overall assembly  100 . The material of the encapsulant  134  may typically include a composition different from the composition of the dielectric layers of the redistribution structure  140 . 
     As shown in  FIG.  1   , microelectronic assembly  100  may further include an optional redistribution structure  140 , which can also be referred to as a “circuit structure” made of a plurality of dielectric layers and electrically conductive features thereon, as described generally in U.S. Provisional Application No. 62/159,136, the disclosure of which is incorporated by reference herein. The electrically conductive features may comprise a plurality of bumps and/or or pads at a first surface of the circuit structure and a plurality of circuit structure contacts at a second surface opposite the first surface. The circuit structure may further include a plurality of traces, wherein the bumps and/or pads and the circuit structure contacts are electrically coupled by the traces. 
     In one example, the redistribution structure  140  can comprise or can be made from a plurality of thin dielectric layers  142  stacked one atop another, and front contacts  144  at the front surface  146 , rear contacts or terminals  148  at the rear surface  150 , and conductive traces  152  electrically coupling the front contacts  144  with the terminals or rear contact  148  of the assembly  100 . In one example, the redistribution structure  140  can have a maximum thickness T 1  of less than 10 microns in a direction normal to the front surface  146  of the redistribution structure  140 . In a particular example, the redistribution structure  140  can have a maximum thickness T 1  of less than 30 microns in a direction normal to the front surface  146  of the redistribution structure  140 , but in other example, the thickness T 1  can be greater than 30 microns. 
     The dielectric material of the dielectric layers  142  can be a material that can be deposited and patterned to form structures that support metallization thereon at a pitch of less than 5 microns, less than 2 microns, less than 1 micron, or at least as low as 0.2 microns. In one embodiment, each of the dielectric layers  142  can be planarized before depositing the next dielectric layer. In particular examples, the dielectric material can be deposited by chemical vapor deposition (“CVD”), spray coating, spin coating, roller coating, dipping, or the like. 
     The dielectric layers  142  may be made from various dielectric materials, such as, for example polymer base or a polyimide. In other examples, the dielectric layers may be composed of alternative dielectric materials, such as silicon dioxide and silicon nitride. In particular examples, the dielectric material can be a photosensitive polymer, e.g., benzocyclobutene (“BCB”) based material, or other photosensitive material. In particular examples, the dielectric material can be deposited by chemical vapor deposition (“CVD”), spray coating, spin coating, roller coating, slot die coating, dipping, or the like. In particular examples, a self-planarizing dielectric material can be deposited to form one or more of the dielectric layers, such material having a tendency to form a flattened or flat upper surface as compared to topography that may be present in features underlying the upper surface. 
     The electrically conductive features of the redistribution structure  140  can provide electrical interconnection between the microelectronic element  120  and components external to the assembly  100 . The electrically conductive features of the redistribution structure  140  can also provide chip-to-chip electrical interconnectivity among other microelectronic elements (not shown) that may be present in the assembly  100 . The front contacts  144  of the redistribution structure  140  can be configured for flip-chip or redistribution layer connection with a plurality of bond pads  122  at the front surface  124  of the microelectronic element  120  and overlie different portions of an area of the front surface  146  of the redistribution structure  140 . Stated another way, the front contacts  144  can be configured to be joined with the corresponding bond pads  122 , in a state in which the front contacts  144  of the redistribution structure are juxtaposed with, i.e., face the corresponding bond pads  122  of the microelectronic element  120 . 
     The electrically conductive features including the bumps  162 , pads  163 , front contacts  144 , rear contacts  148 , and the conductive traces  152  can be made of an electrically conductive material, for example, a metal such as copper, aluminum, nickel, gold, or the like. In one example, the bumps  162  can comprise an electrically conductive bond material such as solder, tin, indium, copper, gold, a eutectic composition or combination thereof, another joining material such as a conductive paste or a conductive adhesive, and/or an electrically conductive composition that includes a metal component such as metal particles or flakes and a polymeric component. Such bumps can be deposited onto the front contacts or pads  163 . 
     In a particular embodiment, the conductive bond material of the bumps  162  can include an electrically conductive matrix material such as described in U.S. patent application Ser. Nos. 13/155,719 and 13/158,797, the disclosures of which are hereby incorporated herein by reference. In a particular embodiment, the conductive bond material of the bumps  162  can have a similar structure or be formed in a manner as described therein. In some examples, suitable materials for the conductive bond material of the bumps  162  can include polymers filled with conductive material in particle form such as metal-filled polymers, including, for example, metal-filled epoxy, metal-filled thermosetting polymers, metal-filled thermoplastic polymers, or electrically conductive inks. 
     In other examples, the bumps  162  can comprise posts or pins, stud bumps or bond via interconnects each formed of extruded wire, such bumps projecting to heights thereof from the second side  108  of the assembly  100 , and can be joined with components external to the microelectronic assembly  100 , such as circuit panel or board. Alternatively, pads  163  can be configured to accept pins (not shown) from a socket (not shown). 
     Additional interconnection elements may be further provided on the back side of the microelectronic assembly  100 . In one example, bumps  164  may also be provided on opposed portion of the assembly  100  overlying the top surface  136  of the encapsulant  134  and provide an electrical interconnection to a component external to the back side of the microelectronic assembly  100 . As shown, a dielectric layer, for example, solder mask  166 , may overlie the first side  107  of the back side conductive component  110 . Openings  168  in the solder mask  166  expose at least a portion of the outer surfaces  113  of the routing layer  112  so as to provide conductive contacts. The bumps  164  may be disposed at the conductive contacts exposed portions of the outer surfaces  113  of the back side routing layers  112  to provide an external connection. The bumps  164  can also be electrically connected to the bumps  162  at the second side  108  of the microelectronic assembly  100  through the back side conductive component  110 , including the back side routing layer  112  and interconnection elements  114 , as well as the redistribution structure  140 . 
     The first side  107  and second side  108  of the assembly  100  can be joined to and electrically interconnected with a component external to the assembly  100 . For example, the rear contacts  148  of the assembly  100  are shown electrically coupled to panel contacts  154  at a major surface  156  of an external device  160 , such as circuit panel or board, by conductive bond material  162  confronting the second side  108  of the assembly  100 , but the rear contacts  148  can be connected to other components, such as other chip packages and the like. The first and second sides  107 , 108  of the assembly  100  may also be interconnected to one another through the back side conductive components  110 . Additionally, a redistribution structure  140  may be provided for in the microelectronic assembly. 
     Multiple chips and/or other electronic components can be positioned within the EMI structure.  FIG.  3    illustrates an alternative microelectronic assembly  100 - 1  which is otherwise identical to microelectronic assembly  100  and can include the same or similar components, except that more than one microelectronic element is disposed within the EMI shield structure  102 - 1 . In this and other embodiments described herein, similar reference numerals will be used to identify similar elements. As shown in this example, two microelectronic elements, a first microelectronic element  1201  and a second microelectronic element  1202 , are positioned within a central portion C of the EMI shield structure  102 - 1 . In this example, the EMI shield structure  102 - 1  can overlie at least two microelectronic elements  1201 ,  1202 , as well as encapsulant  134 - 1 . 
     Intra-package shielding may be accomplished according to aspects of the disclosure. As shown in  FIG.  3 A , microelectronic assembly  100 - 1 A is otherwise similar to microelectronic assembly  100  of  FIGS.  1 - 2    and can include a first microelectronic element  1201 A positioned within an EMI shield structure  102 - 1 A, an encapsulant  134 - 1 A, and other similar components. The only difference in this embodiment is that a second microelectronic element  1202 A may be positioned exterior to the EMI shield structure  102 - 1 A, and in some examples directly adjacent the EMI shield structure  102 - 1 A. In this arrangement, EMI shield structure  102 - 1 A will shield the first microelectronic element  1201 A from the electromagnetic waves of the second microelectronic element  1202 A and vice versa. Electromagnetic waves generated by first microelectronic element  1201 A will be contained by the EMI shield structure  102 - 1 A, which further shields the second microelectronic element  1202 A from any electromagnetic waves generated by the first microelectronic element  1201 A. In another example, a second EMI shield structure (not shown) may be positioned adjacent at least one surface of the second microelectronic element  1202 A, such that multiple EMI shield structures may be present within the assembly  100 - 1 A. 
     The microelectronic assembly  100  of  FIGS.  1 - 2    can optionally include a material capable of conducting heat away from the microelectronic element. In one example, as shown in  FIG.  4   , a microelectronic assembly  100 - 2  is otherwise identical to microelectronic assembly  100  ( FIG.  1   ), except that it further includes a heat dissipation material. In one example, the material is a thermal interface material (“TIM”)  131 - 2  that overlies the rear surface  128 - 2  of the microelectronic element  120 - 2  and is positioned between the EMI shield structure  102 - 2  and the microelectronic element  120 - 2 . In some examples, the thermal interface material  131 - 2  can also be used to bond the bottom surface  111 - 2  of the EMI shield structure  102 - 1  to the microelectronic element  120 - 2 . Exemplary TIMs are those that exist in semisolid, gel-like (grease-like) state throughout the range of expected operating temperatures (e.g., 0 degrees Celsius to 200 degrees Celsius for some assemblies) or at least when the temperatures are high to make die cooling particularly desirable (20 degrees Celsius to 200 degrees Celsius for some assemblies). The thermal interface material  131 - 2  can fill the free space between microelectronic element  120 - 2  and the EMI shield back side routing layer  104 - 2  of the EMI shield structure  102 - 1 . An exemplary TIM material is a thermal grease available from Arctic Silver, Inc. (having an office in California, USA); the grease&#39;s thermal conductivity may be in the range of 1 W/mK, but other grease and/or materials with varying thermal conductivities may be utilized. In still other examples, instead of a thermal interface material  131 - 2 , a structure configured to dissipate heat, such as a heat sink or the like may be utilized and extend around one or more surfaces of the microelectronic element  120 - 2 . 
     Another example microelectronic assembly  100 - 3  is shown in  FIGS.  5 - 6   .  FIG.  5    is a cross-sectional view of the microelectronic assembly  100 - 3  that includes the portion taken across the “ FIG.  5   ” line identified in  FIG.  6   .  FIG.  6    illustrates a schematic and perspective cross-sectional view of a portion of the microelectronic assembly encompassed by the area of the microelectronic assembly identified in  FIG.  5   . In particular, a view shown through the planar top surface of an example EMI shield structure is shown. 
     The structure of the microelectronic assembly  100 - 3  is similar to the microelectronic assemblies of  FIGS.  1 - 4   , but includes an example EMI shield structure  102 - 3  with a top or major surface  111 - 3  that differs in design. As in the previously-described embodiment, microelectronic assembly  100 - 3  can include a plurality of back side conductive components, which in this example, includes EMI shield back side conductive components  110 A- 3  and at least one back side conductive component  110  that is outside of or adjacent the EMI shield structure  102 - 3 . As in the previous examples, back side conductive components  110 - 3  that extend outside of the EMI shield structure  102 - 3  may include an integrally formed and continuous back side routing line  112 - 3  and an interconnection element  114 - 3 . In this example, EMI shield back side conductive components  110 A- 3  may each comprise a plurality of interconnection elements  114   a - 3  integrally joined to an EMI shield back side routing layer or line  104 - 3  ( FIGS.  5 , 6   ) that is a unitary EMI shield back side routing layer line  104 - 3 , as discussed further below. 
     The EMI shield back side conductive components  110 A- 3  can be arranged in numerous configurations to provide an EMI shield structure. In one example, as shown in  FIG.  6   , the back side conductive components  110 A- 3  can be constructed and arranged to form an EMI shield structure with a continuously planar major surface, such as EMI shield structure  102 - 3 . As shown, EMI shield back side conductive components  110 A- 3  may be arranged to extend around the entire periphery of the microelectronic element  120 - 3 . The EMI shield interconnection elements  114   a - 3  of the EMI shield back side conductive components  110 A- 3  can extend around the peripheral edge surfaces  126   a - 3 ,  126   b - 3 ,  126   c - 3 ,  126   d - 3  of the microelectronic element  120 - 3 . The EMI shield back side routing layer  104 - 3 , which continuously extends from each of the EMI shield interconnection elements  114   a - 3 , overlies at least a portion of a surface of the microelectronic element  120 - 3  and in this example overlies the entire rear surface  128 - 3  of the microelectronic element  120 - 3 . As shown, the back side routing layer  104 - 3  can extend from all of the EMI shield interconnection elements  114   a - 3  that together form the EMI shield structure  102 - 3 . 
     EMI shield back side routing layer  104 - 3  may be comprised of a monolithic and unitary back side routing layer that extends the entire width W and length L of the EMI shield structure  102 - 3 . As shown, the major surface  111 - 3  of the EMI shield structure  102 - 3  may be continuously planar. Since the major surface  111 - 3  of the EMI shield structure  102 - 2  is joined to each of the EMI shield interconnection elements  114   a - 3  forming the EMI shield structure  102 - 2 , the EMI shield back side routing line  104 - 3  ( FIG.  5   ) of each individual conductive component  110 A- 3  is part of the monolithic and unitary back side routing layer or line that extends across the entire width W or length L of the EMI shield structure  102 - 2 . In this example, there are no independent back side routing lines or traces that extend from any one of the EMI shield interconnection elements  114   a - 3  that form the EMI shield structure  102 - 3 . 
     As shown, encapsulant  134 - 3  encapsulates the microelectronic element  120 - 3 , the interconnection elements  114 - 3 , and the EMI shield interconnection elements  114 A- 3  of EMI shield structure  102 - 3 . Exposed ends  116 - 3  of the interconnection elements  114 - 3 ,  114   a - 3  can be electrically connected with an optional redistribution structure  140 - 3 , and in particular front contacts  144 - 3  at the surface of the redistribution structure  140 - 3 . 
     A portion of the EMI shield back side conductive components  110 A- 3  overlies the encapsulant  134 - 3 , and particularly the continuous back side routing layer  104 - 3  can overlie either or both the encapsulant  134 - 3  and the microelectronic element  120 - 3  at one time. 
       FIGS.  7 - 8    illustrate another example microelectronic assembly  200  comprising an antenna formed from one of the back side conductive components.  FIG.  7    is a schematic cross-sectional view that includes the portion of the assembly taken across the line “ FIG.  7   ” identified in  FIG.  8   .  FIG.  8    is a schematic and perspective cross-sectional view of a portion of the microelectronic assembly  200  that illustrates antenna  218 , and particularly depicts the portion of the microelectronic assembly  200  identified in  FIG.  7   . 
     Microelectronic assembly  200  includes a plurality of back side conductive components, including back side conductive components  210 A,  210 B,  210 C,  210 D,  210 E,  210 F ( FIG.  8   ) (collectively back side conductive components of the microelectronic assembly  200 ). The back side conductive components may be formed from the same integral or continuous unitary structure (e.g.,  FIGS.  14 A- 14 C ) that is at least partially pre-processed prior to encapsulation within the assembly  200 . One of the plurality of back side conductive components  210 F ( FIG.  8   ) may be patterned to form an antenna, such as antenna  218 . The microelectronic assembly may further include a microelectronic element  220  having a front surface  224  and an opposed rear surface  228 , as well as an optional redistribution structure  240  having a front surface  246  facing toward the front surface  224  of the microelectronic element  220  and an opposed rear surface  250  facing away from the microelectronic element  220 . 
     The antenna  218  can permit transmission of communication signals over commonly available wireless interfaces. In one example where the package assembly includes an RF semiconductor chip (transceiver), antenna  218  can provide wireless communication and detection. Although only one antenna  218  is illustrated, it is to be appreciated that more than one antenna or an array of antennas may be provided within the assembly  200 . 
     The back side conductive component  210 F ( FIG.  8   ) may comprise at least one integrally formed antenna routing line (which will form antenna  218 ) and at least one interconnection element. In this example, antenna  218  is comprised of one antenna routing line  205  that continuously extends from and is integrally formed with a single interconnection element  214   a . As shown, interconnection element  214   a  may extend in a vertical or upright direction that is parallel to the edge surface  226   c  of microelectronic element  220 . Antenna routing line  205  can extend in a direction perpendicular to the direction the interconnection element  214   a  extends. Further, in one example, antenna routing line  205  is comprised of five shorter routing lines  205   a ,  205   b ,  205   c ,  205   d ,  205   e , each of which, in this example, changes direction from the prior shorter routing line and extends perpendicular to the prior shorter routing line. In other examples, fewer shorter routing lines, a greater number of shorter routing lines, and any shape of routing line can be provided. For example, antenna routing line may be circular and include only a single routing line that does not change directions and instead extends continuously in the same direction in a helical pattern. 
     Antenna routing line  205  overlies a major surface of microelectronic element  220 , and in this example, overlies the rear surface  228  of microelectronic element  220 . The antenna routing line  205  can further extend beyond at least one lateral edge surface of the microelectronic element, and in this example, extends beyond two opposed lateral edge surfaces  226   a ,  226   b  of the microelectronic element  220 . But, in other examples, the antenna routing line  205  may additionally or alternatively extend beyond only one of the lateral edge surfaces  226   a ,  226   b , or additionally or alternatively extend beyond one or both of the other two opposed surfaces  226   c ,  226   d  of the microelectronic element  220 . 
     As in the previous examples, an encapsulant  234  may be used to encapsulate at least the microelectronic element  220  and each of the interconnection elements  214 , 214   a  in the microelectronic assembly. As shown, the encapsulant may be positioned between the antenna  218  and rear surface  228  of microelectronic element  220 . In such example, the antenna  218  (including antenna routing line  205 ) directly overlies both the microelectronic element  220  and encapsulant  234 . In other examples, the antenna  218  may directly overlie the rear surface  228  of microelectronic element  220  or overlie an intermediate material or structure, such as a TIM (not shown) or any other material discussed herein, that may be positioned between the antenna  218  and the rear surface  228  of microelectronic element. 
     The antenna routing lines  205  can be patterned to radiate high frequency electromagnetic waves. Various geometric antenna patterns can be created from the back side routing layer  205  to achieve the frequency required of the antenna. Antennas manufactured according to the present disclosure can possess any desired frequency. For example, antennas for microelectronic assemblies or chip packaging are commonly manufactured for frequencies between 300 MHz and 2500 MhZ. In other examples, wave frequency may be 300 GHz. 
     One or more of the remaining back side conductive connections may be further used to carry power, ground, or a signal. Back side conductive components  210 A,  210 B,  210 C,  210 D,  210 E can be identical to previous back side conductive components disclosed herein and may comprise an interconnection element  214  integrally formed with a back side routing layer  212 . For example, back side conductive component  210 A may include an interconnection element  214   a  integrally formed with back side routing line  212 . The back side routing line  212  may, for example, comprise a trace that can carry a signal to or from another component (not shown) within or external the microelectronic assembly. As shown, the back side routing line  212  extends across the top surface  236  of the encapsulant  234 , and in some examples, can further overlie the microelectronic element  220 . In still other examples, back side conductive component  210 C can provide a conductive connection to a ground plane, whereas back side conductive component  210 D ( FIG.  7   ) can carry power. A greater or fewer number of back side conductive components can be provided for within the microelectronic assembly, as needed. 
       FIGS.  9 - 10    illustrate an example microelectronic assembly  300  that includes both an EMI shield structure and an antenna.  FIG.  9    is a schematic cross-sectional view that includes the portion of the assembly taken across the line “ FIG.  9   ” identified in  FIG.  10   .  FIG.  10    is a schematic and perspective cross-sectional view of a portion of the microelectronic assembly  300  that illustrates an example EMI shield structure  302  and an example antenna  318 . As shown,  FIG.  10    depicts the portion of the microelectronic assembly  300  identified in  FIG.  9   . 
     With reference first to  FIG.  9   , encapsulated microelectronic element  320  and a plurality of back side conductive components, including back side conductive components  310 A,  310 B,  310 C,  310 D,  310 E ( FIG.  10   ) (collectively back side conductive components of microelectronic element  320 ) may be provided within the microelectronic assembly  300 . As in the prior examples, such as in  FIGS.  1 - 3   , some of the back side conductive components, such as back side conductive components  310 A and  310 B can be arranged together to form an EMI shield, such as EMI shield structure  302 . At least one other back side conductive element  310 E can be configured to form an antenna, such as antenna  318 . 
     The EMI shield structure  302  and antenna  318  can be formed at the same time from an integral or continuous unitary structure ( FIGS.  11 A- 11 C  and  FIGS.  14 A- 14 C ) that is at least partially pre-processed prior to encapsulation within the assembly  300 . EMI shield structure  302  can be identical to the EMI shield structure  102  discussed with regard to  FIGS.  1 - 3   , and reference is made to the detailed discussion of  FIGS.  1 - 3    without reproduction here. Antenna  318  may be positioned laterally adjacent the microelectronic element  320 . Further, in this example, antenna  318  may be further positioned outside of and laterally adjacent the EMI shield structure  302 . 
     Antenna  318  can continuously extend from and be integrally formed with at least one interconnection element, such as interconnection element  314 C. As shown, interconnection element  314   c  may be flush with an edge surface  337  of the encapsulant  334  and extend in a vertical or upright direction that is parallel to the edge surface  326   c  of microelectronic element  320 . In other examples, interconnection element  314   c  may overlie the edge surface  337  of the encapsulant  334  or may be fully encapsulated by the encapsulant  334 . Antenna  318  may extend in a direction perpendicular to the direction the interconnection element  314   c  extends. As shown, antenna  318  may extend across an interconnection or top surface  336  of encapsulant  334 . The antenna  318  can take on any geometric shape, but in this example, the antenna routing line  305  includes four smaller routing lines  305   a ,  305   b ,  305   c ,  305   d  that extend in directions that are perpendicular to one another. 
     A method of fabricating a microelectronic assembly similar to microelectronic assembly  100  of  FIG.  1    according to aspects of the disclosure will now be described relative to  FIGS.  11 A- 11 J , where similar reference numerals will be used to identify similar features. Turning first to  FIG.  11 A , a microelectronic element  420  may be supported on a carrier  470 , either directly thereon, or through an intervening layer (not shown) which may be a peelable or other sacrificial layer. The carrier  470  can include or be made of glass, metal, silicon, or other material which can be removed by subsequent processing. 
     The height H 2  of the microelectronic element may vary depending on the application. In some examples, the height H 2  of the microelectronic element  420  may vary from 50-100 microns. The height H 1  can be greater than 100 microns or less than 50 microns. In an example where the height H 2  of the microelectronic element is approximately 100 microns, the conductive structure  472  may have a thickness T ranging from 0.2 mm to 2 mm. In some examples, the thickness may be greater than 0.2 mm, or less than 0.2 mm, or greater than 2 mm. 
     A conductive structure  472  can be used to provide back side routing and interconnection elements. An example conductive structure  472 , prior to being patterned, is illustrated in  FIG.  11 B . In one example, the conductive structure  472  may be formed from a layer of conductive material. The conductive material can include a planar first surface  474  and an opposed planar second surface  476 . The selected conductive material can be any conductive material or combination of materials. In some examples, the conductive material may include at least one of copper, nickel, tungsten, cobalt, palladium, gold, silver, alloy, and/or their respective alloys. 
     The conductive structure  472  may be a unitary and/or monolithic structure that is subsequently patterned, such as by etching or other known means, to include a plurality of interconnection elements. In some examples, the unitary structure may be formed by a plurality of layers of the same or different material. Example interconnection elements include interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1  ( FIG.  11 D ),  414   b   2  ( FIG.  11 D ) (collectively “interconnection elements”). As in the prior discussions, where needed to facilitate discussion, interconnection elements that form the EMI shield structure  402 , will also be referred to as EMI shield interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . The interconnection elements  414 ,  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may be formed by partial etching or etching portions of the conductive structure  472  to a height H 1  that is less than the thickness of the overall conductive structure prior to etching. The height H 1  may be, in some examples, one-half or three-fourths of the thickness T of the conductive material prior to etching ( FIG.  11 B ). But, in other examples, the height H 1  may be greater than, less than, or between these amounts. 
     The interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may extend outwardly and away from the base of the conductive structure  472 . An example base  480  can include a first outer surface  479  that is planar (which is the same surface as the first surface  474  of the conductive material  472 ), an opposed second surface  481  that is parallel to the first outer surface  474 , and an edge surface  487  that extends between the first and second surfaces  479 ,  481 . A first portion  483  of each of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  is disposed at and extends continuously from the second surface  481  of the base  480  of the conductive structure  472 . The interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  can include edge surfaces  485  that extend from the second surface  481  of the base  480  to opposed outer ends  486  of the respective interconnection element  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . As shown, the outer ends  486  of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  are exposed. The spacing and number of interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may vary based upon the number of desired connections. In one example, the rows of interconnection elements  414  that are not a part of the EMI shield structure  420  include six interconnection elements  414  in a single row. But, a greater or fewer number of interconnection elements may also be utilized. 
     A plurality of recessed areas  478 A- 478 G may be formed between each of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  and can vary in width. Recessed area  478 D is a central recessed area or a die attach area that includes a width W 1  that is at least large enough to receive the width of a microelectronic element. The interconnection elements  414  disposed on either side of the die attach area  478 D may be equally spaced apart from one another. However, any desired pitch can be achieved. In this example recessed areas  478 B-C and  478 E-F may have widths W 2  that are equal to the widths W 3  of recessed areas  478 A and  478 G. In other examples, the widths W 2  and W 3  may differ. For example, widths W 2  may be less than the widths W 3  and vice versa. 
     The boundary or edge of a recess can be defined by a sidewall edge of one of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . For example, the edges  485  of two adjacent interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  and a floor  477  defined by the second surface  481  of the base  480  form the boundaries of the recessed area, such as recessed area  478 B. Peripheral recessed areas  478 A and  478 G will only have a single interconnection element  414 ,  414   a   1 ,  414 ,  414   a   2 ,  414   b   1 ,  414   b   2  directly adjacent the recessed area, such that only one recessed wall surface is present. The central recessed area  478 D can be the largest of the recessed areas and can be sized to receive one or more microelectronic elements therein. 
     The conductive structure  472  may be patterned to accommodate the height H 2  ( FIG.  11 A ) of the microelectronic element by one-half etching when forming the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . In some examples, the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may have a height H 1  ranging from 50 μm to 400 μm, but generally need to be able to accommodate the height of the microelectronic element  420  and/or other electronic devices that may be in the assembly. In some examples, the height H 1  may be less than 50 μm, greater than 50 μm, or greater than 400 μm. 
     Any number of interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  can be patterned from the conductive structure  472  in any desired pattern or shape. The top view of  FIG.  11 D  shows the top surface  479  of base  480 . An example arrangement of the etched conductive structure  472  and interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  is shown in broken lines (since the posts are not visible from the top view). An array of interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  can extend across the bottom surface  481  of base  480  of the conductive structure  472 . Each of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  in this example have a circular or rounded cross-section. In this example, the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may have a cross-section that is constant along its length H 1 , but in other examples, the cross-section may vary. Similarly, in other examples, the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may have a different shaped-cross section, such as a square, a rectangle or other shape. Further, in other examples, the cross-section of the interconnection element may be uniform along the length H 1 . In still other examples, the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may have different shapes and sizes relative to one another. 
     Several interconnection elements can be arranged together to form a first part of an EMI shield structure, as will be discussed in more detail herein. For example, some of the interconnection elements may be EMI shield interconnection elements that are positioned adjacent recess  478 D and can form EMI shielding in an area around the recess  478 D, which is configured to receive one or more microelectronic elements. In one example, EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  may further extend around all or a part of the peripheral or lateral edge surfaces  426   a ,  426   b ,  426   c ,  426   d  of the microelectronic element  420 . For purposes of discussion, it is to be understand that the EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  are otherwise similar to the remaining interconnection elements in the assembly and discussions regarding interconnection elements  414  are similarly applicable to interconnection elements used to form an EMI shield structure, including EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . 
     As previously discussed, the EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 , may be patterned from the conductive component  472  so that the EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  have a predetermined and center-to-center pitch P that can provide necessary EMI shielding. Formation of EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  around recess  478 D forms the first part of the EMI shield structure that will eventually provide EMI shielding of components within central recess  478 D. 
     The number of overall interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  in any one row can be the same or vary from another row. For example, due to the central die attach area  478 D, the array of interconnection elements that extend in a lateral direction (parallel to an axis extending between the lateral surfaces  426   a ,  426   b  of microelectronic element  420 ) may vary between rows. In one example, the number of interconnection elements  414 ,  414   a   1 ,  414   a   2  in a first row  493 A that extends through die attach area  478 D may be less than the number of interconnection elements that extend in a second row  493 B and don&#39;t extend through the recessed or die attach area  478 D. However, the number of interconnection elements  414 ,  414   b   1 ,  414   b   2  in the second row  493 B can be the same as the interconnection elements  414  in a third row  493 C. 
     The patterned conductive structure  472  can be joined together with the carrier  470  and the microelectronic element  420 , as shown, for example, in  FIG.  11 E . The patterned conductive structure  472  can be removably attached or bonded to the carrier by an adhesive material (not shown) or other means of attachment. The microelectronic element  420  is shown fully positioned within the recessed area  478 D. In this example, the height H 1  of the interconnection element  414  and the recessed areas  478 A-G is greater than a height H 2  of the microelectronic element. 
     As seen in  FIG.  11 F , a dielectric encapsulant may be provided to encapsulate the microelectronic element  420  and each of the interconnection elements, including interconnection elements  414  and EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  ( FIG.  11 D ). In one example, an encapsulant  434  occupies and fills the space between each of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . As shown, the encapsulant  434  is adjacent each of the edges  485  of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . The encapsulant  434  can have outer edge  491  aligned with and extending along the same plane P as the outer edges  482  of the base  480  of the conductive structure  472 . A top edge  436  of the encapsulant  434  can be coplanar with and positioned directly adjacent the second surface  481  of the base  480 . A bottom surface  438  of the encapsulant  434  can be coplanar with and positioned directly adjacent the outer ends  486  of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . Encapsulant can also be positioned between the rear surface  428  of the microelectronic element  420  and the inner surface  481  of the base  480 . 
     In one example, the dielectric encapsulation can be formed by flowing an encapsulant into a mold onto the elements shown in  FIG.  11 E  to form a molded encapsulation. At the time of encapsulation, the ends of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  are unexposed and remain covered by the carrier  470 . Such encapsulation  434  may in some cases in the final assembly resist strain due to mismatch between coefficients of thermal expansion between the encapsulation, the microelectronic element, the carrier  470 , and the redistribution structure  440  ( FIG.  11 H ), which can be attached and electrically connected thereto. 
     Thereafter, as seen in  FIG.  11 G , the carrier  470  can be removed to form an encapsulated in-process assembly  489 , which exposes an interconnection surface  488  thereat, which are also the outer ends  486  of the interconnection elements  414 . The exposed ends outer  486  of the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 , the bond pads  422  of the microelectronic element  420 , and the bottom surface  438  of the encapsulant  434  extend along a substantially planar line and form an interconnection surface  488 . 
     A first part of an EMI shield structure  402  ( FIG.  11 I ) can be formed by the arrangement of EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  around the microelectronic element  420 . In one example, the EMI shield structure  402  can be formed by the arrangement of EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  around one or more peripheral edge surface  426   a ,  426   b ,  426   c ,  426   d  of the microelectronic element  420 . The closely spaced EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  around microelectronic element  420  can provide EMI shielding. In some examples, the EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  can be spaced apart from one another or have a center-to-center pitch P that may range from 100 μm to 1 mm. But, in other examples, the pitch may be less than 100 μm, greater than 100 μm, or greater than 1 mm. In one example, the pitch may be 300 μm. In still other examples, the pitch may be at least 300 μm. The pitch between two adjacent EMI shield interconnection elements  114   a   1 ,  114   a   2 ,  114   b   1 ,  114   b   2  may be the same for some or all EMI shield interconnection elements  114   a   1 ,  114   a   2 ,  114   b   1 ,  114   b   2  or can differ throughout. Although not required, a redistribution structure can be provided at the interconnection surface. The redistribution structure, such as, for example, the redistribution structure  440  shown in  FIG.  11 H , can be prefabricated prior to its electrical connection to the interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  and bond pads  422  of the microelectronic element  420 . The redistribution structure  440  may have a front surface  446 , a rear surface  450 , and an edge surface  451 . In one example, the prefabricated redistribution structure may first be manufactured on a temporary carrier (not shown) and later joined to the interconnection surface  488  of the redistribution structure  440 . Alternatively, the redistribution structure  440  can be manufactured directly thereon with a standard wafer level packaging process. In still other examples, a redistribution structure may be altogether omitted form the assembly. 
     In the example of forming the redistribution structure directly thereon, the process can be performed so as to form a plurality of dielectric layers  442  and electrically conductive features such as described above with reference to  FIG.  1   . For example, the dielectric layers  442  to be formed can include the front contacts  444  at the front surface  446  of the redistribution structure  440 . The last one of the dielectric layers  442  to be formed can include rear conductive elements  448  at the rear surface  450  of the redistribution structure  440 . The rear conductive elements  448  can be electrically coupled to the front contacts  444  by the conductive traces  452 . In examples where the conductive structure  472  is patterned after the redistribution structure is provided, the redistribution structure  472  can help prevent warping and twisting of the package. 
     The conductive structure  472  and in some examples, the base  480  can be further processed and patterned to form a plurality of back side conductive components. As shown, for example, in  FIG.  11 I , the conductive structure  472  can be thinned and patterned by etching to form a plurality of back side conductive components  410 ,  410 A,  410 B ( 11 J). 
     At least some of the back side conductive components can further include a back side routing layer that extends continuously from and is integrally formed with one of the interconnection elements and that can be configured to create any number of electronic interconnections. For example, some of the back side conductive components can be configured and patterned to form an EMI shield structure, while other of the back side conductive components may be patterned to form other conductive components, such as antennas, traces, and the like. In some examples, the back side conductive components  410  that do not form part of the EMI shield structure  402  can be patterned to include an interconnection element  414  that is integrally formed from back side routing line  412 . Such back side routing lines  412  may be an antenna, a trace, and/or or carry power, ground, or a signal. The EMI shield back side conductive components  410 A,  410 B that form part of the EMI shield structure  402  can include EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  that are integrally formed with and patterned to include at least one EMI shield back side routing line, such as EMI shield back side routing lines  404   a ,  404   b , as discussed in more detail below. 
       FIG.  11 J , a top down view of the in-process unit of  FIG.  11 I , illustrates patterning of the back side routing lines from the conductive component  472 . As shown, some of the back side conductive components may be EMI shield back side conductive components  410 A,  410 B. A second portion of EMI shield structure  402  can also be formed by patterning of the conductive component  472 . In one example, the outer surface  479  of the base  480  of the conductive component  472  can be patterned to form a grid-like pattern and a major surface  411  of the EMI shield structure  402 . The base  480  can be patterned with EMI horizontal back side routing lines  404   a . As shown, horizontal back side routing lines  404   a  are etched to extend in a direction parallel to a direction extending between the opposed lateral surfaces  426   a ,  426   b  of the microelectronic element. In this example, the horizontal back side routing lines  104   a  have an overall length L 1  defining the width of the magnetic shield  402 . Some of the horizontal back side routing lines  404   a  will overlie the rear surface  428  of the microelectronic element  420 . 
     The perpendicular back side routing lines  404   b  can extend perpendicular to and intersect with the horizontal back side routing lines  404   a . The perpendicular back side routing lines  404   b  further extend in a direction parallel to a direction extending between the opposed surfaces  425   c ,  425   d  of the microelectronic element  420 . Some of the vertical back side routing lines  404   b  overlie the rear surface  428  of the microelectronic element  420 . In this example, the perpendicular routing lines  104   b  have an overall length L 2  defining the length of the EMI shield structure  402 . The horizontal back side routing lines  404   a  and the perpendicular back side routing lines  404   b  can be collectively referred to as “EMI shield back side routing lines” or “back side routing lines.” 
     At least one end of each of the EMI shield back side horizontal and perpendicular back side routing line  404   a ,  404   b  can extend continuously from an interconnection element, such as one of EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2 . As shown in this example, a horizontal back side routing lines  404   a  can continuously extend from and between two interconnection elements  414   a   1 ,  414   a   2  positioned adjacent opposed edges  426   a ,  426   b  of microelectronic element  402 . The back side conductive component  410 A can, in some examples, include the two interconnection elements  414   a   1 ,  414   a   2  and the integrally formed back side EMI shield routing layer  404   a  may be positioned between the two interconnection elements  414   a   1 ,  414   a   2 . The back side conductive component  410 A can, in some examples, include the two interconnection elements  414   a   1 ,  414   a   2  and the integrally formed back side EMI routing layer  404   a . Similarly, back side conductive components  410 B include perpendicular back side routing lines  404   b  that are patterned to extend perpendicular to the horizontal back side routing lines  404   b . In some examples, the EMI shield back side conductive component  410 B will comprise two interconnection elements  414   b   1 ,  414   b   2  that are adjacent opposed edges  426   c ,  426   d  of microelectronic element  402  and that are joined by the horizontal EMI shield back side routing line  404   b.    
     The arrangement of the EMI shield back side conductive components  410 A (including EMI shield interconnection elements  414 ,  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  and back side routing lines  404   a ,  404   b ) around microelectronic element  420  forms an EMI shield structure  402  according to aspects of the disclosure. The first portion of the EMI shield structure  402  can be formed with etching of the conductive component  472  to form EMI shield interconnection elements  414   a   1 ,  414   a   2 ,  414   b   1 ,  414   b   2  around peripheral edge surfaces  426   a ,  426   b ,  426   c ,  426   d  of microelectronic element  420 . The second portion of the EMI shield structure  402  can be formed with patterning of the EMI shield back side routing lines  404   a ,  404   b . In this example, the back side conductive components are integrally formed from the conductive component  472 , such that the EMI shield structure is a unitary structure and in some examples, a monolithic structure. Further, in this example, the first portion of the EMI shield structure can be formed prior to encapsulation, whereas the second portion of the EMI shield structure can be formed after encapsulation so as to allow for the EMI shield back side conductive components and the corresponding back side routing lines to extend across the encapsulation surface. 
     As shown, other back side conductive components  410  that are not arranged to form EMI shield structure  402  are also provided within the microelectronic assembly  400 . The back side conductive components  410  may be integrally formed at the same time as the EMI shield layer. Some of the back side conductive components, may further provide connections for signal, power and/or ground. 
     With reference back to  FIG.  11 I , the back side routing lines can be patterned to any desired thickness. In this example, the thickness or height T 1  of the EMI shield back side routing layer  404   a ,  404   b  ( FIG.  11 J ) and thickness or height T 2  of the back side routing layers  110  adjacent the EMI shield  410 A may range from 2 μm to 500 μm, but in other examples, the shield structure may have a thickness T 1 /T 2  that is less than 2 μm or greater than 500 μm. In still other examples, the thickness T 1 /T 2  may be more than 100 μm. In still other examples, the thickness of the back side routing layers that form the EMI shield back side routing layers and the thickness of the back side routing layers  110  that do not form part of the EMI shield structure  402  may be the same. But, in other examples, the thicknesses may differ. 
     A dielectric layer, such as a solder mask  490  may be provided over the back side routing layer  412  and EMI shield back side routing layers  404   a , 404   b  of the back side conductive components  410 , 410 A,  410 B as shown in  FIG.  11 K . Thereafter, openings in the dielectric layer may be formed to allow for conductive masses, such as solder mass  464 , to be electrically connected with the back side routing layer  412 . Conductive masses  462  may also be provided on the rear conductive elements  448  of the redistribution structure  440 . The resulting structure is the microelectronic assembly  400  shown in  FIG.  11 K  (which is similar to the microelectronic assembly  100  of  FIG.  1   ). 
     In the alternative example where the redistribution structure carrier is pre-formed, the front surface  446  of the redistribution structure may be bonded to the encapsulant  434 . In one embodiment, the adhesive may be or include one or more layers of epoxy, elastomer, polyimide or other polymeric material. In some cases, a material used as a conformal dielectric coating over one or more of the microelectronic elements may also function as an adhesive. In one embodiment, such conformal dielectric coating can be a polyxylylene material such as commonly referred to as “parylene”. Parylene can also be used as a die attach adhesive between adjacent microelectronic elements. 
     It is to be appreciated that multiple microelectronic assemblies may be prepared at one time, and then singulated during any desired part of the manufacturing process. For example, with reference back to  FIG.  11 A , in an alternative example (not shown), instead of a single microelectronic element on a carrier, multiple microelectronic elements may be provided on the carrier and the conductive material  472  may be sized and patterned to include features for multiple conductive components  472 . Thereafter, during or after another part of the manufacturing process, such as during preparation of any of  FIGS.  11 G . to  11 K, individual microelectronic assemblies may be singulated. In one example, individual microelectronic assemblies may be singulated after the dielectric layer  490  is applied over the back side conductive components, such as at some during or after formation of the assembly shown in  FIG.  11 K . 
     In some examples, a thermal interface material (not shown) may also be provided over the rear surface  428  of the microelectronic element  420  prior to attachment of the conductive structure  472 , as shown in  FIG.  4 B . The thermal interface material layer can alternatively be provided onto the rear surface  428  of the microelectronic element  420  prior to being deposited on the carrier  470 . One example method that incorporates a thermal interface material layer into a microelectronic assembly is disclosed in U.S. Pat. No. 10,181,447, which issued on Jan. 15, 2019 and is entitled 3D-Interconnect, and the disclosure of which is incorporated herein by reference in its entirety. 
     Numerous modifications can be made to the design of the EMI shield structure  402 . For example, the number, shape, and size of the interconnection elements that are configured and arranged to provide lateral EMI shielding adjacent side edges of the microelectronic element can widely vary. Further, the patterning of the conductive component  472  to form a major surface of the EMI shield structure can widely vary. 
     In some examples, it may be desired to modify the design of a major surface of the EMI shield structure by further including additional horizontal and/or back side routing lines to increase the number of back side routing lines and increase the shielding capabilities of the EMI shield structure  402 . In some examples, additional back side routing lines can be created and formed from the same conductive component  472  ( FIG.  11 B ) at the same time the back side conductive components  410  are formed. The additional back side routing lines may be EMI shield back side routing lines that are not directly attached to an interconnection element  414 A, and may only be indirectly connected to one of the EMI shield interconnection elements  414 A through other conductive connectors. For example, another back side routing line may be etched from the conductive layer and indirectly connected to an interconnection element  414  via a trace or other routing line. 
       FIG.  12    illustrates such example method for patterning additional back side routing lines that are indirectly connected to an interconnection element. As in the previous example shown in  FIG.  11 J , the major surface  411 - 1  of the EMI shield structure  402 - 1  may include several horizontal back side routing lines  404   a - 1  and several perpendicular back side routing lines  404   b - 1 . The horizontal back side routing lines  404   a - 1  may extend continuously from respective interconnection elements  414   a   1 - 1 ,  414   a   2 - 1  and the perpendicular back side routing lines  404   b - 1  may extend continuously from interconnection elements  414   b   1 - 1 ,  414   b   2 - 1 . This is similar to the configuration shown and manufactured in  FIG.  11 J  of the prior example. However, in this example, during patterning of the base of the conductive structure (see prior  FIGS.  11 H- 11 I ), additional horizontal back side routines lines  405 - 1  may be provided or patterned between two directly adjacent horizontal back side routing lines  404   a - 1  (i.e., those back side routing lines  404   a  that have at least one end portion extending directly and continuously from an interconnection element  414   a   1 - 1 ). These additional back side routing lines  405 - 1  will not directly and continuously extend from one or more interconnection elements  414 - 1  in the assembly, but will alternatively extend from at least one adjacent routing line. For example, as shown, each routing line  405 - 1  can extend from at least one perpendicular routing line  404   b - 1 . Additional perpendicular back side routing lines (not shown) may additionally or alternatively be provided between two directly adjacent perpendicular back side routing lines  404   b - 1 . 
     Another example method of EMI shield structure formation is shown in  FIG.  13   , which is an exemplary method for forming microelectronic element assembly  100 - 3  shown in  FIGS.  5 - 6   . The components include the same components in  FIGS.  11 A- 11 C , but differs in the manufacturing of the back side routing layer. EMI shield structure  402 - 2  is shown, in which a major surface  411 - 2  of the EMI shield structure  402 - 2  is a continuous planar surface, such as discussed with regard to  FIGS.  5 - 6   . In this example, the major surface  411 - 2  of the EMI shield structure  402 - 2  extends continuously between the EMI shield interconnection elements  414   a   1 - 2 ,  414   a   2 - 2 ,  414   b   1 - 2 ,  414   b   2 - 2 . In this method of formation, individual routing lines are not patterned, as in previous examples, but instead only the peripheral edges of the EMI shield structure  402 - 2  are patterned to define the shape of the major surface  411 - 2  of the EMI shield structure  402 - 2 . In this example, the perimeter P of the EMI shield structure  402 - 2  forms the shape of a square with sharp edges, but in other examples, any other shape or pattern can be formed and/or edges, such as rounded, wavy, can be utilized. 
     This example further illustrates an alternate arrangement of other interconnection elements  414  in a microelectronic assembly (i.e., those interconnection elements  414 - 2  that do not form part of the EMI shield structure). As shown, interconnection elements  414 - 2  are positioned at the corners of the microelectronic assembly  400 - 2 , and a back side routing line  412 - 2  is shown extending between two interconnection elements  414 - 2 . 
     A manufacturing process that incorporates back side conductive components, such as back side conductive components  410  and EMI shield back side conductive components  410 A,  410 B integrally formed at the same time from a pre-processed unitary structure, as opposed to being formed by plating conductive vias or the like, allows for improvements over known assemblies, including a reduction in the overall cost of the assembly, simplified fabrication, improvements on package warpage, small form factor, and various other improvements. 
     With reference to  FIGS.  14 A- 14 J , an example method of assembling a microelectronic assembly that includes an antenna, such as microelectronic assembly  200  described in  FIGS.  7 - 8   , is disclosed. The method of manufacturing the assembly is similar to the previous embodiment ( FIGS.  11 A- 11 K ), except that instead of patterning the conductive component to form an EMI shield structure from the back side conductive components, an antenna is additionally or alternatively patterned or formed. As shown in  FIG.  14 A , microelectronic element  520  is provided on a carrier  570 . The conductive component  572  ( FIG.  14 B ) can be processed ( FIG.  14 C ) in a similar way as previously described in  FIGS.  11 B- 11 C  to form interconnection elements  514  that extend away from a base  580  and that are spaced apart from one another by recessed areas  578 A,  578 B,  578 C,  578 D,  578 E,  578 F,  578 G between the interconnection elements  514 .  FIG.  14 D  illustrates a top view of the patterned conductive structure  572 . An example arrangement of the etched conductive structure  572  and interconnection elements, including interconnection elements  514  and at least one antenna interconnection element  514   a  (also referred to as “interconnection element”) are shown in broken lines since the posts are not visible from the top view. Patterned conductive structure  572  can be joined with the carrier  570  supporting the microelectronic element  520  ( FIG.  14 E ), such that the conductive component  572  overlies the rear surface  528  of the microelectronic element  520 . The rear surface  528  of the microelectronic element  520  may be spaced apart from the second surface  576  of the conductive structure  572  by a distance H 4 . The distance H 4  can be any desired distance. The distance H 4  may be greater in circumstances where it may be desired to increase the distance between the microelectronic element and the conductive component  572  to accommodate other features or devices in the assembly. In other examples where it is desired to minimize the overall height of the assembly, the conductive structure  572  can extend along the rear surface  528  of the microelectronic element  520 . Still further, in other examples, another material, such as TIM (not shown) may be provided on the rear surface  528  of the microelectronic element  520 . 
     The microelectronic element  520  and conductive component  572  can be encapsulated, as shown in  FIG.  14 F . An encapsulant  534  can fill the space between the bottom surface  576  of the conductive component  572 , the rear surface  528  of the microelectronic element, the edge surfaces  526   a ,  526   b ,  526   c ,  526   d  ( FIG.  14 J ) of the microelectronic element  520 , and the edge surfaces  585  of each of the conductive interconnection elements  514 ,  514   a  ( FIG.  14 D ). In this example, all of the interconnection elements  514 ,  514   a  are encapsulated. Once encapsulated, the carrier  570  can be removed to expose an interconnection surface  588 . As shown in  FIG.  14 G , an interconnect surface  588  includes the ends  586  of the interconnection elements  514 ,  514   a  the bond pads  522 , and bottom surface  538  of the encapsulant  534 . An optional redistribution structure  540  can be manufactured, as previously disclosed herein, and joined to and electrically connected with the interconnection surface  588 . ( FIG.  14 H ). Front contacts  544  of the redistribution structure  540  can be juxtaposed with the ends  586  of the interconnection element  514 ,  514   a  and the bond pads  522  of the microelectronic element  520 . 
     The conductive component  572  can be etched so as to form a plurality of back side conductive components, including back side conductive components  510   a ,  510   b ,  510   c ,  510   d ,  510   e ,  510   f . As in previous examples, conductive components  510   a ,  510   b ,  510   d ,  510   e ,  510   f  can include respective back side routing lines  512  that are integrally formed with the interconnection elements  514  as shown in  FIG.  14 I . As in previous examples, back side routing lines  512  can extend along the top surface  536  of the encapsulant  534 . 
     At least one of the back side conductive components, such as back side conductive component  510   c , can be patterned to form an antenna  518 .  FIG.  14 J , a top down view of the in-process unit of  FIG.  14 I , illustrates the patterning of the back side routing lines from the conductive component  572 . Back side conductive component  510   c  comprises an interconnection element  514   a  and a continuous back side routing line  505  that is patterned to form an antenna  518 . Antenna  518  overlies encapsulant  534  and microelectronic element  520 . As shown in this example, antenna routing line  505  extends across top surface  536  of the encapsulant  536 . Antenna routing line  505  further overlies and extends across the rear surface  528  of microelectronic element  520 , and in this example, at least a portion of antenna routing line  505  can overlie the top surface  536  of encapsulant  534  and microelectronic element  520 . Antenna routing line  505  may be comprised of multiple shorter routing lines. For example, shorter routing lines  505   a ,  505   b ,  505   c ,  505   d ,  505   e  collectively form the antenna back side routing line  505  and the antenna  518 . Each of the shorter routing lines  505   a ,  505   b ,  505   c ,  505   d ,  505   e  may be joined end to end by a directly adjacent routing line. In this example, each of the shorter routing lines change direction from the prior shorter routing line and extends perpendicular to the prior shorter routing line. In other examples, fewer shorter routing lines, a greater number of shorter routing lines, and any shape of routing line can be provided. For example, antenna routing line may be circular and include only a single routing line that does not change directions and instead extends continuously in the same direction in a helical pattern. 
     As in previous examples, the back side routing lines of some other back side conductive components may be patterned as traces. As shown in  FIG.  14 J , the back side routing lines  512  of back side conductive components, such as back side conducive components  510   a ,  510   b ,  510   d ,  510   e ,  510   f  are traces. One or more of the back side conductive components  510   a ,  510   b ,  510   d ,  510   e ,  510   f  or other back side conductive components in the microelectronic assembly may further provide connections that can carry signal, power and/or ground. It is to be appreciated that the back side routing lines in  FIG.  14 J  are exemplary and numerous other modifications can be made to the patterning of the back side routing layer. 
     Once patterning of the base  580  of the conductive component  572  is complete, a dielectric layer  590 , as shown in  FIG.  14 K , can be provided over the back side routing lines  512  and antenna back side routing line  505  (such as back side routing lines  505   a ,  505   b  and  505   c  ( FIG.  14 J ), and  505   d . Openings ( FIG.  14 K ) may be provided therein to allow for conductive bumps  564  to be provided at the first side  506  of the assembly  500 . ( FIGS.  14 K and  14 L .) Conductive bond bumps  562  can also be joined with the rear contracts  548  of the redistribution structure  540  at the second side  508  of the assembly  500 . 
     It is to be appreciated that in this example, patterning of the conductive component  572  occurred after the redistribution layer  540  was provided. In other examples, the back side conductive component  572  may be patterned prior to the attachment of the redistribution layer  540 . For example, patterning may occur after encapsulation ( FIG.  14 F ). In such example, patterning can further occur prior to removal of the carrier layer  570  ( FIG.  14 G ). Optionally, after removal of the carrier layer  570 , another carrier layer can be provided or in process unit may be directly attached to a circuit board or other external component. 
     A manufacturing process that incorporates back side conductive components, such as back side conductive components  510  that include an antenna  518  integrally formed at the same time from a pre-processed unitary structure, as opposed to being formed by plating the antenna pattern or the like, allows for improvements over known assemblies, including a reduction in the overall cost of the assembly, simplified fabrication, improvements on package warpage, small form factor, and various other improvements. 
     Turning now to  FIG.  15   , a method of manufacturing a microelectronic assembly with an electromagnetic shield structure is described. At box  610 , a conductive structure may be patterned to comprise a base, a plurality of interconnection elements extending continuously away from the base, and a die attach area sized to receive a microelectronic element. Some of the plurality of interconnection elements may be EMI shield interconnection elements that extend around a perimeter of the recessed area. 
     At box  620 , ends of the plurality of interconnection elements and the EMI shield interconnection elements may be bonded to a carrier so that a microelectronic element disposed on the carrier is positioned within the die attach area and so that the EMI shield interconnection elements are laterally adjacent and extend around the microelectronic element. The patterning the conductive structure may further comprise patterning the plurality of EMI shield interconnection elements so that the EMI shield interconnection elements are spaced around the microelectronic element to form a first portion of the EMI shield structure. 
     At box  630 , the plurality of interconnection elements, the EMI shield interconnection elements, and the microelectronic element may be encapsulated 
     At box  640 , the carrier may be removed to expose the free ends of the plurality of interconnection elements and the EMI shield interconnection elements. 
     At box  650 , the exposed top surface of the conductive structure overlying the microelectronic element may be patterned to form a second portion of the EMI shield structure, and so that the second portion of the EMI shield structure extends continuously away from and is integrally formed with the first portion of the EMI shield structure, 
       FIG.  16    illustrates a method of manufacturing a microelectronic assembly that includes an antenna. At block  710 , a conductive structure may be patterned to form a base, a plurality of interconnection elements that extend continuously away from the base, and a die attach area sized to receive a microelectronic element. Ends of the plurality of interconnection elements may be bonded to a carrier so that a microelectronic element disposed on the carrier is positioned within the die attach area at block  720 . 
     The plurality of interconnection elements and the microelectronic element may be encapsulated with an encapsulant and so that an outer surface of the conductive structure remains exposed at block  730 . The carrier may be removed to expose the free ends of the plurality of interconnection elements at block  740 . 
     At block  750 , the exposed outer surface of the conductive structure may be patterned to expose a surface of the encapsulant and to include a plurality of conductive back side routing lines that extend continuously from and are integrally formed with the plurality of interconnection elements. The plurality of conductive back side routing lines may extend across the surface of the encapsulant. The first back side conductive routing line of the plurality of conductive back side routing lines may be patterned into an antenna routing line to form an antenna. A second back side conductive routing line of the plurality of conductive back side routing lines is patterned into a trace that can carry at least one of a signal, ground, or power. 
     The assemblies and methods described above with reference to  FIGS.  1 - 16    above can be utilized in construction of diverse electronic systems, such as the system  1000  shown in  FIG.  17   . For example, the system  1000  in accordance with a further embodiment of the invention includes one or more modules or components  1006  such as the assemblies as described above, in conjunction with other electronic components  1010  and  1011 . 
     In the exemplary system  1000  shown, the system can include a circuit panel, motherboard, or riser panel  1002  such as a flexible printed circuit board, and the circuit panel can include numerous conductors  1004 , of which only one is depicted in  FIG.  16   , interconnecting the modules or components  1006 ,  1010 , and  1011  with one another. Such a circuit panel  1002  can transport signals to and from each of the microelectronic packages and/or microelectronic assemblies included in the system  1000 . However, this is merely exemplary; any suitable structure for making electrical connections between the modules or components  1006  can be used. 
     In a particular embodiment, the system  1000  can also include a processor such as the semiconductor chip  1008 , such that each module or component  1006  can be configured to transfer a number N of data bits in parallel in a clock cycle, and the processor can be configured to transfer a number M of data bits in parallel in a clock cycle, M being greater than or equal to N. Additionally, other chip packages, such as chip packages  1008 ′ may be provided within the system, as well. 
     In the example depicted in  FIG.  17   , the component  1008  is a semiconductor chip and component  1010  is a display screen, but any other components can be used in the system  1000 . Of course, although only two additional components  1010  and  1011  are depicted in  FIG.  8    for clarity of illustration, the system  1000  can include any number of such components. 
     Modules or components  1006  and components  1008 ,  1010 , and  1011  can be mounted in a common housing  1001 , schematically depicted in broken lines, and can be electrically interconnected with one another as necessary to form the desired circuit. The housing  1001  is depicted as a portable housing of the type usable, for example, in a cellular telephone or personal digital assistant, and screen  1010  can be exposed at the surface of the housing. In embodiments where a structure  1006  includes a light-sensitive element such as an imaging chip, a component  1011 , such as a lens or other optical device also can be provided for routing light to the structure. Again, the simplified system shown in  FIG.  17    is merely exemplary; other systems, including systems commonly regarded as fixed structures, such as desktop computers, routers and the like can be made using the structures discussed above. 
     According to an aspect of the disclosure, a method of manufacturing a microelectronic package with an integrally formed EMI shield structure comprises patterning a conductive structure to comprise a base, a plurality of interconnection elements extending continuously away from the base, and a die attach area sized to receive a microelectronic element, wherein some of the plurality of interconnection elements are EMI shield interconnection elements that extend around a perimeter of the die attach area; bonding ends of the plurality of interconnection elements and the EMI shield interconnection elements to a carrier so that a microelectronic element disposed on the carrier is positioned within the die attach area and so that the EMI shield interconnection elements are laterally adjacent and extend around the microelectronic element, wherein the patterning further comprises patterning the plurality of EMI shield interconnection elements so that the EMI shield interconnection elements are spaced around the microelectronic element to form a first portion of the EMI shield structure; encapsulating the plurality of interconnection elements, the EMI shield interconnection elements, and the microelectronic element with an encapsulant and so that an outer surface of the conductive structure remains exposed; removing the carrier to expose free ends of the plurality of interconnection elements and the EMI shield interconnection elements; and patterning the exposed outer surface of the conductive structure overlying the microelectronic element to form a second portion of the EMI shield structure, and so that the second portion of the EMI shield structure extends continuously away from and is integrally formed with the first portion of the EMI shield structure; and/or 
     patterning the exposed outer surface of the conductive structure to form the second part of the EMI shield occurs after the encapsulating; and/or 
     the second portion of the EMI shield structure extends along and overlies surface of the encapsulant; and/or 
     the patterning the exposed outer surface to form the second portion further comprises patterning EMI routing lines that extend continuously from the EMI shield interconnection elements; and/or 
     the patterning the exposed outer surface further comprises patterning a first set of EMI shield routing lines to extend in parallel to one another and patterning a second set of EMI shield routing lines to extend in a direction perpendicular to the first set so as to form a grid pattern; and/or 
     etching a monolithic conductive material to form the conductive structure comprises etching the monolithic conductive material to form the plurality of interconnections; and/or the patterning comprises patterning the exposed outer surface to define a continuous planar surface that overlies the microelectronic element and that extends continuously from the EMI shield interconnection elements; and/or 
     patterning the exposed outer surface of the conductive structure to form an antenna pattern extending across a surface of the encapsulant and connected to one of the plurality of interconnection elements; and/or 
     the patterning the outer surface of the conductive structure to form the antenna pattern further comprises patterning a portion of the outer surface of the conductive structure that is spaced away from the EMI shield interconnection elements; and/or 
     the plurality of EMI shield interconnections are spaced apart from one another to form a plurality of recessed areas therebetween, and wherein the encapsulating further comprises filling the plurality of recessed areas with the encapsulant, and wherein the patterning exposes a surface of the encapsulant. 
     According to another aspect of the disclosure, a microelectronic assembly comprises a microelectronic element, a plurality of back side conductive components and an encapsulant. The microelectronic element may have an active front surface, an opposed rear surface, and opposed edge surfaces extending between the front and rear surface. At least some of the plurality of back side conductive components are EMI shield back side conductive components. The EMI shield back side conductive components may further comprising EMI shield interconnection elements and at least one EMI shield back side routing line, the EMI shield back side conductive components forming an EMI shield structure adjacent at least one of the edge surfaces and the rear surface of the microelectronic element; and an encapsulant surrounding at least the opposed edge surfaces of the microelectronic element and the EMI shield interconnection elements. The EMI shield interconnection elements are configured to form a first portion of the EMI shield structure, wherein the at least one EMI shield back side routing line overlies the rear surface of the microelectronic element and forms a second portion of the EMI shield structure, and wherein the at least one back side routing line extends continuously from at least one of the EMI shield interconnection elements and along a surface of the encapsulant; and/or 
     the at least one EMI shield back side routing line is a single routing line overlying a rear surface of the microelectronic element and extending away from a corresponding one of the EMI shield interconnection elements; and/or 
     the at least one EMI shield back side routing line comprises an EMI shield back side routing line that forms a major surface of the EMI shield structure, the major surface being a continuous planar surface extending from and joined to each of the EMI shield interconnection elements; and/or 
     the at least one EMI shield back side routing line is a plurality of EMI shield back side routing lines, and wherein each of the plurality of EMI shield back side routing lines extends continuously from a corresponding one of the EMI shield interconnection elements; and/or 
     the plurality of EMI shield back side routing lines are arranged in a grid pattern; and/or 
     some of the plurality of EMI shield back side routing lines extend in a horizontal direction and others of the plurality of EMI shield back side routing lines extend in a direction perpendicular to the some of the plurality of EMI shield back side routing lines; and/or 
     other of the plurality of back side conductive components each comprise an interconnection element and traces extending continuously away from the interconnection element and across a surface of the encapsulant; and/or 
     at least one other of the plurality of back side conductive components comprises an interconnection element and a back side routing line that is patterned to form an antenna; and/or 
     the microelectronic element is a first microelectronic element and the assembly further comprises a second microelectronic element, wherein the first microelectronic element is positioned within the EMI shield structure and the second microelectronic element is positioned outside of the EMI shield structure. 
     According to another aspect, a system further comprises the aforementioned microelectronic assembly and one or more other electronic components electrically connected to the assembly; and/or 
     the system further includes a housing, the assembly and the other electronic components being mounted to the housing. 
     According to another aspect of the disclosure, method of manufacturing a microelectronic package with an integrally formed antenna comprises patterning a conductive structure to form a base, a plurality of interconnection elements extending continuously away from the base, and a die attach area sized to receive a microelectronic element; bonding ends of the plurality of interconnection elements to a carrier so that a microelectronic element disposed on the carrier is positioned within the die attach area; encapsulating the plurality of interconnection elements and the microelectronic element with an encapsulant and so that an outer surface of the conductive structure remains exposed; removing the carrier to expose free ends of the plurality of interconnection elements; and patterning the exposed outer surface of the conductive structure to expose a surface of the encapsulant and to include a plurality of conductive back side routing lines extending continuously from and integrally formed with the plurality of interconnection elements, the plurality of conductive back side routing lines extending across the surface of the encapsulant; wherein a first conductive back side routing line of the plurality of conductive back side routing lines is patterned into an antenna routing line to form an antenna, and wherein a second conductive back side routing line of the plurality of conductive back side routing lines is patterned into a trace that can carry at least one of a signal, a ground, or a power; and/or 
     the patterning the antenna routing line comprises patterning the antenna routing line to extend in two or more directions across the surface of the encapsulant; and/or 
     the trace carries ground, and the patterning the exposed outer surface further comprises patterning a third back side conductive routing line of the plurality of conductive back side routing lines so as to carry one of the signal or the power; and/or the patterning the exposed outer surface further comprises patterning some of the plurality of conductive back side routing lines into an electromagnetic interference shield structure overlying the microelectronic element. 
     According to another aspect of the disclosure, an assembly, comprises a microelectronic element having an active front surface, an opposed rear surface, and opposed edge surfaces extending between the front and rear surfaces; a plurality of back side conductive components, each of the plurality comprising an interconnection element and a back side routing line integrally formed with and connected to the interconnection element; and an encapsulant surrounding the microelectronic element and edges of the plurality of back side conductive components, wherein a first back side routing line of a first back side conductive component comprises an antenna pattern, and wherein a second back side routing line of a second back side conductive component comprises a trace that provides a conductive connection for one of a power, a ground, or a signal; and/or 
     some of the plurality of conductive back side routing lines form an electromagnetic interference shield structure overlying the microelectronic element. 
     As used in this disclosure, terms such as “upper,” “lower,” “top,” “bottom,” “above,” “below,” and similar terms denoting directions, refer to the frame of reference of the components themselves, rather than to the gravitational frame of reference. With the parts oriented in the gravitational frame of reference in the directions shown in the figures, with the top of drawing being up and the bottom of the drawing being down in the gravitational frame of reference, the top surface of the microelectronic element is, indeed, above the bottom surface of the microelectronic element in the gravitational frame of reference. However, when the parts are turned over, with the top of the drawing facing downwardly in the gravitational frame of reference, the top surface of the microelectronic element is below the bottom surface of the microelectronic element in the gravitational frame of reference. 
     With reference to a dielectric region or a dielectric structure of a component, e.g., circuit structure, interposer, microelectronic element, capacitor, voltage regulator, circuit panel, substrate, etc., as used in this disclosure, a statement that an electrically conductive element is “at” a surface of the carrier, dielectric region, or other component indicates that, when the surface is not covered or assembled with any other element, the electrically conductive element is available for contact with a theoretical point moving in a direction perpendicular to that surface of the dielectric region from outside the dielectric region or component. Thus, a terminal or other conductive element which is at a surface of a dielectric region may project from such surface; may be flush with such surface; or may be recessed relative to such surface in a hole or depression in the dielectric region. 
     The incorporation of back side conductive components manufactured according to the disclosure herein into microelectronic assemblies can provide improvements over the art. Such assemblies allow for lower cost construction due to the materials needed and a small form factor. Additionally, for assemblies including a redistribution structure, the back side routing layer can counter-balance warpage caused by the redistribution structure. While certain examples were disclosed herein, it should be appreciated that back side routing layers can be further designed for other three-dimensional connections and heat dissipation. 
     Throughout this disclosure, the directions parallel to the front and rear surfaces of the microelectronic element or redistribution structure are referred to herein as “horizontal” or “lateral” directions, whereas the directions perpendicular to the front and rear surfaces or parallel to the edge surfaces of the microelectronic element are referred to herein as upward or downward directions and are also referred to herein as the “vertical” directions. The directions referred to herein are in the frame of reference of the structures referred to in the disclosure. Thus, these directions may lie at any orientation to the normal or gravitational frame of reference. 
     Unless otherwise stated, the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. Among others, the descriptions of features in one embodiment are understood to be applicable in another embodiment. For example, the discussion of various heights, thicknesses, and general descriptions of similar components or features in one embodiment can be the same in other embodiments, although not required. As these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the subject matter defined by the claims. In addition, the provision of the examples described herein, as well as clauses phrased as “such as,” “including” and the like, should not be interpreted as limiting the subject matter of the claims to the specific examples; rather, the examples are intended to illustrate only one of many possible embodiments. Further, the same or similar reference numbers in different drawings can identify the same or similar elements.