Coil component

A coil component includes a body, a support substrate buried in the body, a coil portion disposed on at least one surface of the support substrate and having both ends exposed to a surface of the body, a noise removing portion disposed on the at least one surface of the support substrate, spaced apart from the coil portion, and forming an open loop such that one end of the noise removing portion is exposed to a surface of the body, an insulating layer disposed between the coil portion and the noise removing portion, first and second external electrodes disposed on a surface of the body and connected to both ends of the coil portion, respectively, and a third external electrode disposed on a surface of the body and connected to the one end of the noise removing portion.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims benefit of priority to Korean Patent Application No. 10-2019-0086176 filed on Jul. 17, 2019 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a coil component.

BACKGROUND

An inductor, a coil component, is a representative passive electronic component used in electronic devices together with a resistor and a capacitor.

As an electronic device has been designed to have high performance and a reduced size, the number of electronic components used in an electronic device has been increased, and the sizes of electric components have been reduced.

Accordingly, there has been increasing demand for removing noise from a coil component, such as electromagnetic interference (EMI).

SUMMARY

An aspect of the present disclosure is to provide a coil component which may easily remove noise.

According to an aspect of the present disclosure, a coil component includes a body; a support substrate buried in the body; a coil portion disposed on at least one surface of the support substrate and having both ends exposed to a surface of the body; a noise removing portion disposed on the at least one surface of the support substrate, spaced apart from the coil portion, and having an open loop such that one end of the noise removing portion is exposed to a surface of the body; an insulating layer disposed between the coil portion and the noise removing portion; first and second external electrodes disposed on a surface of the body and connected to both ends of the coil portion, respectively; and a third external electrode disposed on a surface of the body and connected to the one end of the noise removing portion.

DETAILED DESCRIPTION

The terms used in the exemplary embodiments are used to simply describe an exemplary embodiment, and are not intended to limit the present disclosure. A singular term includes a plural form unless otherwise indicated. The terms, “include,” “comprise,” “is configured to,” etc. of the description are used to indicate the presence of features, numbers, steps, operations, elements, parts or combination thereof, and do not exclude the possibilities of combination or addition of one or more features, numbers, steps, operations, elements, parts or combination thereof. Also, the term “disposed on,” “positioned on,” and the like, may indicate that an element is positioned on or beneath an object, and does not necessarily mean that the element is positioned on the object with reference to a gravity direction.

The term “coupled to,” “combined to,” and the like, may not only indicate that elements are directly and physically in contact with each other, but also include the configuration in which the other element is interposed between the elements such that the elements are also in contact with the other component.

Sizes and thicknesses of elements illustrated in the drawings are indicated as examples for ease of description, and exemplary embodiments in the present disclosure are not limited thereto.

In the drawings, an L direction is a first direction or a length direction, a W direction is a second direction or a width direction, a T direction is a third direction or a thickness direction.

In the descriptions described with reference to the accompanied drawings, the same elements or elements corresponding to each other will be described using the same reference numerals, and overlapped descriptions will not be repeated.

In electronic devices, various types of electronic components may be used, and various types of coil components may be used between the electronic components to remove noise, or for other purposes.

In other words, in electronic devices, a coil component may be used as a power inductor, a high frequency inductor, a general bead, a high frequency bead, a common mode filter, and the like.

First Embodiment and Modified Examples Thereof

FIG. 1is a diagram illustrating a coil component according to an example embodiment.FIG. 2is a diagram illustrating the coil component illustrated inFIG. 1, viewed from an upper surface.FIG. 3is a cross-sectional diagram taken along line I-I′ inFIG. 1.FIG. 4is a cross-sectional diagram taken along line II-II′ inFIG. 1. InFIG. 1, an insulating layer applied to the example embodiment is not illustrated to clearly represent combinations between the elements.

Referring toFIGS. 1 to 4, a coil component1000in the example embodiment may include a body100, a support substrate200, a coil portion300, insulating layers410and420, a noise removing portion500, and first to fourth external electrodes610,620,630, and640, and may further include an insulating film IF.

The body100may form an exterior of the coil component1000in the example embodiment, and the coil portion300may be buried in the body100.

The body100may have a hexahedral shape, for example.

The body100may include a first surface101and a second surface102opposing each other in a length direction X, a third surface103and a fourth surface104opposing each other in a width direction Y, and a fifth surface105and a sixth surface106opposing each other in a thickness direction Z. The first to fourth surfaces101,102,103, and104of the body100may be walls of the body100connecting the fifth surface105and the sixth surface106of the body100to each other. In the description below, “front and rear surfaces of the body” may refer to the first surface101and the second surface102, respectively, and “side surfaces of the body” may refer to the third surface103and the fourth surface104of the body, respectively. Also, “one surface and another surface” of the body100may refer to the fifth surface105and the sixth surface106of the body100, respectively.

As an example, the body100may be configured such that the coil component1000in which the external electrodes610,620,630, and640are formed may have a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm, but an exemplary embodiment thereof is not limited thereto. The above-mentioned sizes are example sizes determined without consideration of a process error, and the like, and an example of the sizes is not limited thereto.

The body100may include a magnetic material and a resin material. For example, the body100may be formed by layering one or more magnetic composite sheets including a magnetic material dispersed in a resin. Alternatively, the body100may have a structure different from the structure in which a magnetic material is dispersed in a resin. For example, the body100may be formed of a magnetic material such as a ferrite.

The magnetic material may be a ferrite or a magnetic metal powder.

The ferrite may include, for example, one or more materials of a spinel ferrite such as an Mg—Zn ferrite, an Mn—Zn ferrite, an Mn—Mg ferrite, a Cu—Zn ferrite, an Mg—Mn—Sr ferrite, an Ni—Zn ferrite, and the like, a hexagonal ferrite such as a Ba—Zn ferrite, a Ba—Mg ferrite, a Ba—Ni ferrite, a Ba—Co ferrite, a Ba—Ni—Co ferrite, and the like, a garnet ferrite such as a Y ferrite, and a Li ferrite.

The magnetic metal powder may include one or more selected from a group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the magnetic metal powder may be one or more of a pure iron powder, a Fe—Si alloy powder, a Fe—Si—Al alloy powder, a Fe—Ni alloy powder, a Fe—Ni—Mo alloy powder, Fe—Ni—Mo—Cu alloy powder, a Fe—Co alloy powder, a Fe—Ni—Co alloy powder, a Fe—Cr alloy powder, a Fe—Cr—Si alloy powder, a Fe—Si—Cu—Nb alloy powder, a Fe—Ni—Cr alloy powder, and a Fe—Cr—Al alloy powder.

The magnetic metal powder may be amorphous or crystalline. For example, the magnetic metal powder may be a Fe—Si—B—Cr amorphous alloy powder, but an exemplary embodiment of the magnetic metal powder is not limited thereto.

The ferrite and the magnetic metal powder may have an average diameter of 0.1 μm to 30 μm, but an example of the average diameter is not limited thereto.

The body100may include two or more types of magnetic materials dispersed in a resin. The notion that types of the magnetic materials are different may indicate that one of an average diameter, a composition, a crystallinity, and a form of one magnetic material is different from those of the other magnetic material(s).

The resin may include one of an epoxy, a polyimide, a liquid crystal polymer, or mixture thereof, but the example of the resin is not limited thereto.

The body100may include a core110penetrating through the coil portion300and the support substrate200. The core110may be formed by filling a through hole of the coil portion300with a magnetic composite sheet, but an exemplary embodiment thereof is not limited thereto.

The support substrate200may be buried in the body100. The support substrate200may support the coil portion300.

The support substrate200may be formed of an insulating material including a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a polyimide, or a photosensitive insulating resin, or may be formed of an insulating material including a reinforcing material such as a glass fiber or an inorganic filler with the above-described insulating resin. For example, the support substrate200may be formed of a material such as prepreg, Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) resin, a photoimageable dielectric (PID), a copper clad laminate (CCL) and the like, but an example of the material of the internal insulating layer is not limited thereto.

As an inorganic filler, one or more materials selected from a group consisting of silica (SiO2), alumina (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, mud, a mica powder, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3), and calcium zirconate (CaZrO3) may be used.

When the support substrate200is formed of an insulating material including a reinforcing material, the support substrate200may provide improved stiffness. When the support substrate200is formed of an insulating material which does not include a glass fiber, the support substrate200may be desirable to reduce an overall thickness of the coil portion300.

The coil portion300may be buried in the body100, and may embody properties of the coil component. For example, when the coil component1000is used as a power inductor, the coil portion300may store an electric field as a magnetic field such that an output voltage may be maintained, thereby stabilizing power of an electronic device.

The coil portion300may be formed on at least one of both surfaces of the support substrate200, and may form at least one turn. In the example embodiment, the coil portion300may include first and second coil patterns311and312formed on both surfaces of the support substrate200opposing each other in a thickness direction Z of the body100, respectively, and a via320penetrating the support substrate200to connect the first and second coil patterns311and312to each other.

Each of the first coil pattern311and the second coil pattern312may have a planar spiral form forming at least one turn with reference to the core110as a shaft. As an example, the first coil pattern311may form at least one turn with reference to the core110as a shaft on a lower surface of the support substrate200, and the second coil pattern312may form at least one turn with reference to the core110as a shaft on an upper surface of the support substrate200, in the direction indicated inFIG. 3.

Ends of the first and second coil patterns311and312may be connected to the first and second external electrodes610and620, respectively. As an example, an end of the first coil pattern311may extend to be exposed to the first surface101of the body100, and an end of the second coil pattern312may extend to be exposed to the second surface102of the body100, such that the first and second coil patterns311and312may be connected to the first and second external electrodes610formed on the first and second surfaces101and102of the body100, respectively. In this case, each of the coil patterns311and312including the ends may be formed in integrated form.

At least one of the coil patterns311and312and the via320may include at least one or more conductive layers.

As an example, when the second coil pattern312and the via320are formed on the other surface of the support substrate200by a plating process, each of the second coil pattern312and the via320may include a seed layer and an electroplating layer. The seed layer may be formed by a vapor deposition process such as an electroless plating process, a sputtering process, and the like. Each of the seed layer and the electroplating layer may have a single layer structure, or a multilayer structure. The electroplating layer having a multilayer structure may be formed in conformal film structure in which an electroplating layer is covered by another electroplating layer, or a structure in which an electroplating layer is only layered on one surface of one of the electroplating layers. A seed layer of the second coil pattern312and a seed layer of the via320may be integrated with each other such that a boundary may not be formed therebetween, but an example embodiment thereof is not limited thereto. An electroplating layer of the second coil pattern312and an electroplating layer of the via320may be integrated with each other, such that a boundary may not be formed therebetween, but an example embodiment thereof is not limited thereto.

As another example, with reference to the directions inFIGS. 3 and 4, when the coil portion300is formed by separately forming the first coil pattern311disposed on a lower surface of the support substrate200and the second coil pattern312disposed on an upper surface of the support substrate200and layering the first coil pattern311and the second coil pattern312on the support substrate200, the via320may include a metal layer having a high melting point and a metal layer having a low melting point, lower than a melting point of the metal layer having a high melting point. The metal layer having a low melting point may be formed as solder including lead (Pb) and/or tin (Sn). At least a portion of the metal layer having a low melting point may be melted due to pressure and a temperature when the metal layers are layered. Accordingly, an intermetallic compound (IMC) layer may be formed on at least a portion of a boundary between the metal layer having a low melting point and the second coil pattern312and a portion of a boundary between the metal layer having a low melting point and the metal layer having a high melting point.

The coil patterns311and312may be configured to be exposed from a lower surface and an upper surface of the support substrate200, respectively, in the direction indicated inFIGS. 3 and 4. As another example, the first coil pattern311may be formed on and exposed from a lower surface of the support substrate200, and the second coil pattern312may be buried in the support substrate200, and an upper surface of the second coil pattern312may be exposed to an upper surface of the support substrate200, in the direction indicated inFIGS. 3 and 4. In this case, a concave portion may be formed on the upper surface of the second coil pattern312, and the upper surface of the support substrate200and the upper surface of the second coil pattern312may not be coplanar with each other. As another example, the second coil pattern312may be formed on and exposed from an upper surface of the support substrate200, and the first coil pattern311may be buried in a lower surface of the support substrate200, and a lower surface of the first coil pattern311may be exposed to a lower surface of the support substrate200, in the direction inFIGS. 3 and 4. In this case, a concave portion may be formed on the lower surface of the second coil pattern312, and the lower surface of the support substrate200and the lower surface of the second coil pattern312may not be coplanar with each other.

The coil patterns311and312may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but an example of the material is not limited thereto.

The insulating film IF may be formed along surfaces of the first coil pattern311, the support substrate200, and the second coil pattern312. The insulating film IF may protect and insulate the coil patterns311and312, and may include a well-known insulating material such as parylene, or the like. An insulating material included in the insulating film IF is not limited to any particular material. The insulating film IF may be formed by a method such as a vapor deposition method, or the like, but an example of the method is not limited thereto. In the example embodiment, the insulating layers410and420may be formed on the insulating film IF, and accordingly, the insulating film IF may be disposed between the support substrate200and the insulating layers410and420and between the coil patterns311and312and the insulating layers410and420.

The insulating layers410and420may be disposed between the coil portion300and the noise removing portion500. As an example, as illustrated inFIGS. 3 and 4, the first insulating layer410may be disposed on the first coil pattern311, and may be disposed between the first coil pattern311and a first noise removing pattern510in the example embodiment. The second insulating layer420may be disposed on the second coil pattern312and may be disposed between the second coil pattern312and a second noise removing pattern520.

The insulating layers410and420may be formed by layering insulating films on both surfaces of the support substrate200on which the coil portion300and the insulating film IF are formed. The insulating film may be implemented by a general non-photosensitive insulating film such as Ajinomoto build-up film (ABF), prepreg, and the like, or a photosensitive insulating film such as a dry-film or a PID. The insulating layers410and420may function as dielectric layers in relation to capacitive coupling between the coil patterns311and312of the coil portion300and the noise removing patterns510and520of the noise removing portion500. For example, the insulating layers410and420may be composed of a dielectric material. In this case, the insulating layers410and420may not include a magnetic material.

The noise removing portion500may be disposed in the body100to emit noise transferred to components and/or noise generated from components to a substrate on which the coil component is mounted. For example, the noise removing portion500may be buried in the body100, may be disposed on the coil portion300, and may form an open loop such that one end of the noise removing portion500may be exposed to a surface of the body100. In the example embodiment, the first noise removing pattern510may be disposed on the first insulating layer410and may be disposed on the first coil pattern311, and the second noise removing pattern520may be disposed on the second insulating layer420and may be disposed on the second coil pattern312. The noise removing portion500including the first and second noise removing patterns510and520may be capacitively-coupled to the coil portion300by means of the insulating layers410and420.

The noise removing portion500may form an open loop. For example, each of the first and second noise removing patterns510and520may be disposed such that the other end extending from one end exposed to the third surface of the body100may be spaced apart from the one end. Thus, in the example embodiment, each of the first and second noise removing patterns510and520may have a ring shape including a slit S formed therein, corresponding to the first and second coil patterns311and312. The slit S may extend in a direction crossing adjacent turns. For example, the slit S may linearly extend in a direction perpendicular to, or substantially perpendicular to, the third or fourth surface103or104.

Each of the first and second noise removing patterns510and520may be disposed to correspond to a region in which the coil portion300is disposed. As an example, referring toFIGS. 1, 2, and 4, a value of a line width of a region of the second noise removing pattern520disposed on the third surface103of the body100may be similar to, or substantially equal to, a value of a distance between an innermost turn and an outermost turn of the second coil pattern312in a region disposed on the third surface103. As the noise removing portion500is disposed in a region corresponding to the coil portion300, noise may be easily removed, and a decrease in magnetic material in the body100may be significantly reduced. Accordingly, degradation of properties of the component caused by a decrease in magnetic material may be significantly prevented.

One end of the noise removing portion500may be exposed to the third surface103of the body100. One end of the noise removing portion500may be connected to the third external electrode630disposed on the third surface103of the body100. For example, in the example embodiment, one ends of the first and second noise removing patterns510and520may be exposed to the third surface103of the body100and may be connected to the third external electrode630. When the coil component1000is mounted on a substrate, the third external electrode630may be connected to a ground of the substrate, and when the coil component1000is packaged into an electronic component package, the third external electrode630may be connected to a ground of the electronic component package. In the example embodiment, the fourth external electrode640disposed on the fourth surface104of the body100may be included, and the fourth external electrode640may be used as a non-contact terminal (e.g., the fourth external electrode640may be spaced apart from the noise removing patterns500and the coil portion300) and may be connected to a ground of a substrate on which the coil component is mounted, or may be connected to a ground of a package. In one example, the support substrate200may include an end, overlapping the one end of the noise removing portion500in the thickness direction Z. The end of the support substrate200, similar to the one end of the noise removing portion500, may be exposed from the third surface103and connected to the third external electrode630.

The noise removing patterns510and520may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but an example of the material is not limited thereto. In one example, each of the noise removing patterns510and520may include an electrically conductive layer. The noise removing patterns510and520and the slit S may be formed by a method including at least one of a vapor deposition process such as an electroless plating process, an electroplating process, a sputtering process, and an etching process, but an example of the method is not limited thereto.

The first and second external electrodes610and620may be disposed on the first and second surfaces101and102of the body100, respectively, and may be connected to the first and second coil patterns311and312, respectively. Accordingly, the first external electrode610may be disposed on the first surface101of the body100and may be in contact with and connected to an end of the first coil pattern311exposed to the first surface101of the body100. The second external electrode620may be disposed on the second surface102of the body100and may be in contact with and connected to an end of the second coil pattern312exposed to the second surface102of the body100. The first and second external electrodes610and620may extend to the sixth surface106of the body100from the first and second surfaces101and102of the body100, respectively. The first and second external electrodes610and620may extend to a portion of each of the third, fourth, and fifth surfaces103,104, and105of the body100from the first and second surfaces101and102of the body100, respectively. Forms of the first and second external electrodes610and620illustrated inFIG. 1and the other diagrams are merely examples, and alternatively, each of the external electrodes610and620may be configured to not extend to a portion of each of the third, fourth, and fifth surfaces103,104, and105of the body100and may have an L-shaped form, and various other forms.

When the coil component1000is mounted on a substrate such as a printed circuit board, or the like, the first and second external electrodes610and620may electrically connect the coil component1000to the substrate. For example, the coil component1000in the example may be mounted such that the sixth surface106of the body100may be oriented to face an upper surface of a printed circuit board, and the external electrodes610and620extended to the sixth surface106of the body100may be electrically connected to a connection portion of the printed circuit board by a conductive coupling member such as solder, or the like.

The first to fourth external electrodes610,620,630, and640may include at least one of a conductive resin layer and an electroplating layer. The conductive resin layer may be formed by printing a paste, or the like, and may include one or more conductive metals selected from a group consisting of copper (Cu), nickel (Ni), and silver (Ag), and a thermosetting region. The electroplating layer may include one or more selected from a group consisting of nickel (Ni), copper (Cu), and tin (Sn).

FIG. 15is a diagram illustrating signal transmission properties (S-parameters) of a coil component in prior art.FIG. 16is a diagram illustrating signal transmission properties (S-parameters) of a coil component according to an example embodiment.FIG. 18is a diagram illustrating signal transmission properties (S-parameters) of a coil component including a noise removing portion having a closed-loop form. InFIGS. 15, 16, and 18, a solid line indicates an input reflective coefficient, S11, and a dotted line indicates a transmission coefficient from an input terminal to an output terminal, S21. Referring toFIG. 15, differently from the example embodiment, a general coil component in which a noise removing portion is not formed may smoothly transmit a low frequency signal from a direct current, but in a frequency higher than a resonance frequency, a self-resonance frequency (SRF), an effect of removing noise may significantly degrade. Referring toFIG. 16, the coil component1000in the example embodiment may relatively smoothly transmit a low frequency signal from a direct current similarly to a general coil component, and may effectively prevent unnecessary high frequency noise as compared to a general coil component. Referring toFIG. 18, when a noise removing portion forms a closed-loop differently from the example embodiment, noise may not be properly emitted externally, and accordingly, an effect of removing noise may degrade.

FIG. 5is a diagram illustrating a coil component according to a modified example, corresponding to a cross-sectional surface taken along line II-II′ inFIG. 1.FIG. 6is a diagram illustrating a coil component according to another modified example, corresponding to a cross-sectional surface taken along line II-II′ inFIG. 1.FIG. 7is a diagram illustrating a coil component according to another modified example, corresponding to a cross-sectional surface taken along line II-II′ inFIG. 1.

Referring toFIG. 5, in the example embodiment, one end of a first noise removing pattern510may be exposed to a fourth surface104of a body100, and one end of a second noise removing pattern520may be exposed to a third surface103of the body100. One end of the first noise removing pattern510may be in contact with and connected to a fourth external electrode640disposed on the fourth surface104of the body100, and one end of the second noise removing pattern520may be in contact with and connected to a third external electrode630disposed on the third surface103of the body100. Thus, in the example embodiment, even when one of the third and fourth external electrodes630and640connected to a ground of a substrate on which the coil component is mounted, or the like, is disconnected from the substrate, noise may be removed.

Referring toFIG. 6, in the example embodiment, noise removing portions500and520may be only disposed on a second coil pattern312. When it is not necessary to remove noise, the noise removing portion may be selectively formed on one of both surfaces of a support substrate200, and accordingly, material costs may be reduced, and by increasing a content of a magnetic material included in a component having the same size, component properties may improve. Optionally or alternatively, the coil component may further include the insulating layer410(not shown inFIG. 6) described above.

Referring toFIG. 7, in the example embodiment, an insulating film IF may be formed along surfaces of a support substrate200, coil patterns311and312, insulating layers410and420, and noise removing patterns510and520. In the example embodiment, a time point at which the insulating film IF is formed may be different from the aforementioned example embodiment. Accordingly, in the example embodiment, the insulating film IF may be formed by forming the coil patterns311and312, insulating layers410and420, and noise removing patterns510and520on the support substrate200and performing a trimming process. In the example embodiment, the number of trimming process may be reduced as compared to the aforementioned example embodiment.

Second Example Embodiment and Modified Examples Thereof

FIG. 8is a diagram illustrating a coil component according to another example embodiment.FIG. 9is a diagram illustrating the coil component illustrated inFIG. 8, viewed from an upper surface.FIG. 10is a cross-sectional diagram taken along line inFIG. 8.FIG. 11is a cross-sectional diagram taken along line IV-IV′ inFIG. 8. InFIG. 8, an insulating layer applied to the example embodiment is not illustrated to clearly represent combinations between the elements.

Referring toFIGS. 1 to 4andFIGS. 8 to 11, in a coil component2000in the example embodiment, a shape of a noise removing portion500may be different from that of the noise removing portion500of the coil component1000described in the aforementioned example embodiment. Thus, in the example embodiment, only the noise removing portion500will be described. The descriptions of the other elements in the example embodiment may be the same as the descriptions of the elements in the aforementioned example embodiment.

Referring toFIGS. 8 to 11, the noise removing portion500in the example embodiment may be formed in planar spiral form. Accordingly, each of first and second noise removing patterns510and520may have a planar spiral form, and may have a plurality of turns similarly to first and second coil patterns311and312.

In this case, a coil portion300and a noise removing portion500may have the same coiling direction from an innermost turn to an outermost turn. As an example, viewed from an upper surface in the direction indicated inFIG. 8, a coiling direction from an innermost turn to an outermost turn of the second coil pattern312may be the same as a coiling direction from an innermost turn to an outermost turn of the second noise removing pattern520. Also, viewed from a lower surface in the direction indicated inFIG. 8, a coiling direction from an innermost turn to an outermost turn of the first coil pattern311may be the same as a coiling direction from an innermost turn to an outermost turn of the first noise removing pattern510. When the coiling directions of the first and second noise removing patterns510and520are different from the coiling directions of the first and second coil patterns311and312, an effect of removing noise may degrade.

FIG. 17is a diagram illustrating signal transmission properties (S-parameters) of a coil component according to another example embodiment of the present disclosure. InFIG. 17, a solid line indicates an input reflective coefficient, S11, and a dotted line indicates a transmission coefficient from an input terminal to an output terminal, S21. Referring toFIG. 15, differently from the example embodiment, a general coil component in which a noise removing portion is not formed may smoothly transmit a low frequency signal from a direct current, but at a frequency higher than a resonance frequency, a self-resonance frequency (SRF), an effect of removing noise may significantly degrade. Differently from a general coil component, referring toFIG. 17, the coil component2000in the example embodiment may relatively smoothly transmit a low frequency signal from a direct current similarly to a general coil component, and may effectively prevent unnecessary high frequency noise as compared to a general coil component. Referring toFIG. 18, when a noise removing portion forms a closed-loop differently from the example embodiment, noise may not be properly emitted externally, and accordingly, an effect of removing noise may degrade.

FIG. 12is a diagram illustrating a coil component according to a modified example, corresponding to a cross-sectional surface taken along line IV-IV′ inFIG. 8.FIG. 13is a diagram illustrating a coil component according to another modified example, corresponding to a cross-sectional surface taken along line IV-IV′ inFIG. 8.FIG. 14is a diagram illustrating a coil component according to another modified example, corresponding to a cross-sectional surface taken along line IV-IV′ inFIG. 8.

ReferringFIG. 12, in the example embodiment, one end of a first noise removing pattern510may be exposed to a fourth surface104of a body100, and one end of a second noise removing pattern520may be exposed to a third surface103of the body100. One end of the first noise removing pattern510may be in contact with and connected to a fourth external electrode640disposed on the fourth surface104of the body100, and one end of the second noise removing pattern520may be in contact with and connected to a third external electrode630disposed on the third surface103of the body100. Thus, in the example embodiment, even when one of the third and fourth external electrodes630and640connected to a ground of a substrate on which the coil component is mounted, or the like, is disconnected from the substrate, noise may be removed.

Referring toFIG. 13, in the example embodiment, noise removing portions500and520may be only disposed on a second coil pattern312. When it is not necessary to remove noise, the noise removing portion may be selectively formed on one of both surfaces of a support substrate200, and accordingly, material costs may be reduced, and by increasing a content of a magnetic material included in a component having the same size, component properties may improve. Optionally or alternatively, the coil component may further include the insulating layer410(not shown inFIG. 13) described above.

Referring toFIG. 14, in the example embodiment, an insulating film IF may be formed along surfaces of a support substrate200, coil patterns311and312, insulating layers410and420, and noise removing patterns510and520. In the example embodiment, a time point at which the insulating film IF is formed may be different from the aforementioned example embodiment. Accordingly, in the example embodiment, the insulating film IF may be formed by forming the coil patterns311and312, insulating layers410and420, and noise removing patterns510and520and performing a trimming process. In the example embodiment, the number of trimming process may be reduced as compared to the aforementioned example embodiment.

Third Example Embodiment and Modified Examples Thereof

FIG. 19is a diagram illustrating a coil component according to another example embodiment.FIG. 20is a cross-sectional diagram taken along line V-V′ inFIG. 19. InFIG. 19, an insulating layer applied to the example embodiment is not illustrated to clearly represent combinations between the elements.

Referring toFIGS. 1 to 4andFIGS. 19 and 20, in a coil component3000, shapes of third and fourth external electrodes630and640in the example embodiment may be different from those of the third and fourth external electrodes630and640described in the aforementioned example embodiment. Thus, in the example embodiment, only the third and fourth external electrodes630and640will be described. The descriptions of the other elements in the example embodiment may be the same as the descriptions of the elements in the aforementioned example embodiment.

Referring toFIGS. 19 and 20, the third and fourth external electrodes630and640in the example embodiment may be connected to each other on a sixth surface106of a body100.

For example, an end of the third external electrode630extended to the sixth surface106of the body100may be in contact with and connected to an end of the fourth external electrode640extended to the sixth surface106of the body100. When the coil component3000in the example embodiment is mounted on a substrate such as a printed circuit board, the sixth surface106of the body100may be a mounting surface. A plurality of signal pads and a plurality of ground pads may be formed on a surface of the substrate on which the coil component is mounted to be connected to other components. In the example embodiment, by configuring the third and fourth external electrodes630and640to be connected to each other on the sixth surface106of the body100, a ground pad of the substrate on which the coil component is mounted may be easily connected to first and second noise removing patterns510and520. Accordingly, a mounting process may be easily performed.

FIG. 21is a diagram illustrating a coil component according to a modified example, corresponding to a cross-sectional surface taken along line V-V′ inFIG. 19.

Referring toFIG. 21, third and fourth external electrodes630and640in the example embodiment may be configured to surround third, fourth, fifth, and sixth surfaces103,104,105, and106of a body100. In the example embodiment, the third and fourth external electrodes630and640connected to noise removing patterns510and520may be easily formed on a surface of the body100. In other words, the third and fourth external electrodes630and640may be easily formed by a printing method such as a screen-printing process, or the like. Even when the third and fourth external electrodes630and640are formed by a plating process, by patterning a plating resist in a simplified manner, the third and fourth external electrodes630and630may be easily formed.

Although not illustrated, the example embodiment may also be modified as the aforementioned example embodiments.

Fourth Example Embodiment

FIG. 22is a diagram illustrating a coil component according to another example embodiment.FIG. 23is a cross-sectional diagram taken along line VI-VI′ inFIG. 22.FIG. 24is a cross-sectional diagram taken along line VII-VII′ inFIG. 22.FIG. 25is a diagram illustrating a connection relationship among a support substrate, a coil portion, and a noise removing portion according to another example embodiment. InFIGS. 22 and 25, an insulating layer applied to the example embodiment is not illustrated to clearly represent combinations between the elements.

Referring toFIGS. 1 to 4andFIGS. 22 to 25, in a coil component4000, a dispositional relationship among a coil portion300, a noise removing portion500, a first insulating layer410, and a second insulating layer420may be different from that of the coil portion300and the noise removing portion500of the coil component1000described in the aforementioned example embodiment. Thus, in the example embodiment, only a dispositional relationship among the coil portion300, the noise removing portion500, the first insulating layer410, and the second insulating layer420will be described. The descriptions of the other elements in the example embodiment may be the same as the descriptions of the elements in the aforementioned example embodiment.

Referring toFIGS. 22 to 25, the noise removing portion500in the example embodiment may be disposed between the coil portion300and the support substrate200.

For example, a first noise removing pattern510may be in contact with and formed on a lower surface of a support substrate200, the first coil pattern311may be disposed on the first noise removing pattern510, and a first insulating layer410may be disposed between the first noise removing pattern510and the first coil pattern311and may electrically connect the first noise removing pattern510and the first coil pattern311to each other, in the direction indicated inFIGS. 22 to 25. The second noise removing pattern520may be in contact with and formed on an upper surface of the support substrate200, a second coil pattern312may be disposed on the second noise removing pattern520, and a second insulating layer420may be disposed between the second noise removing pattern520and the second coil pattern312and may electrically insulate the second noise removing pattern520and the second coil pattern312from each other. A via320connecting the first and second coil patterns311and312to each other may include a first via321penetrating the support substrate200, a second via322penetrating the first insulating layer410, and a third via323penetrating the second insulating layer420. The second and third vias322and323may penetrate the first and second insulating layers410and420and may be in contact with and connected to both ends of the first via321. The second and third vias322and323may be spaced apart from the first and second noise removing patterns510and520.

The first to third vias321,322, and323may be formed in different processes, and a boundary may be formed among the vias. The first to third vias321,322, and323may also be formed in the same process and may be integrated with one another. When the first to third vias321,322, and323are formed in different processes, the second via322penetrating the first insulating layer410may cover one end of the first via321on which a seed layer penetrates the support substrate200. The third via323penetrating the second via322may cover the other end of the first via321on which a seed layer penetrates the support substrate200. Accordingly, the seed layers of the second and third vias322and323may be interposed between electroplating layers of the first to third vias321,322, and323, a boundary may be formed between the electroplating layers of the first to third vias321,322, and323. When the first to third vias321,322, and323are formed in the same process, a seed layer may be formed on an internal wall of a via hole penetrating the first insulating layer410, the support substrate200, and the second insulating layer420, and the via hole may be filled with an electroplating layer. In this case, the first to third vias321,322, and323may be distinguished from one another by a dispositional region, rather than being distinguished from one another by an interfacial surface therebetween, differently from the above-described process. In both the processes, the seed layer and the electroplating layer of the second via322may be integrated with the seed layer and the electroplating layer of the third via323, respectively, but an example embodiment thereof is not limited thereto. Similarly, the seed layer and the electroplating layer of the third via323may be integrated with a seed layer and an electroplating layer of the second coil pattern312, respectively, but an example embodiment thereof is not limited thereto.

FIG. 24illustrates an example in which diameters of the second and third vias322and323may be the same in upper and lower portions of the second and third vias322and323, but an example embodiment thereof is not limited thereto. As an example, although not limited thereto, to form the second and third vias322and323, the second and third vias322and323may be formed such that diameters of the second and third vias322and323may decrease in a direction of the other surfaces of the first and second insulating layers410and420in contact with the support substrate200from one surfaces of the first and second coil patterns311and312in contact with the first and second coil patterns311and312using a process for forming a via hole in the first and second insulating layers410and420. Also,FIG. 24illustrates an example in which both ends of the first via321taken in the thickness direction Z of the body100may be directly in contact with one ends of the second and third vias322and323, respectively, but an example embodiment thereof is not limited thereto. As an example, although not limited thereto, via pads spaced apart from the first and second noise removing patterns510and520may be formed on both surfaces of the support substrate200, and the first to third vias321,322, and323may be in contact with and interconnected to the via pads, respectively. By including the via pads, connection reliability among the first to third vias321,322, and323may be secured. A diameter of the via pad may be greater than a diameter of each of ends of the second and third vias322and323in contact with the via pad, but an example embodiment thereof is not limited thereto. Also,FIG. 24illustrates an example in which centers of the first to third vias321,322, and323may match, but an example embodiment thereof is not limited thereto. A via320may be configured as a staggered via such that centers of the first to third vias321,322, and323may not match.

In the example embodiment, differently from the aforementioned example embodiments, the noise removing portion500may be formed on the support substrate200, and the coil portion300may be formed on the noise removing portion500. As the coil portion300has a relatively high aspect ratio, when the insulating layers410and420are disposed on the coil portion300, it may be difficult to planarize surfaces of the insulating layers410and420, and accordingly, it may be difficult to dispose the noise removing portion500on the insulating layers410and420. In the example embodiment, to address the above-described issue, the noise removing portion500having a relatively simplified pattern shape and having a low aspect ratio may be preferentially formed on the support substrate200.

Although not illustrated, the example embodiment may also be modified as the aforementioned example embodiments.

According to the aforementioned example embodiments, noise may be easily removed.