Filter having a laminated structure and electronic device including the same

Abstract

The filter having a laminated structure of the embodiment includes a plurality of grounding sections stacked in a first direction and having a plate shape, a plate-shaped signal section arranged between the plurality of grounding sections facing the plurality of grounding sections in the first direction, a line signal section arranged adjacent to at least one of the plurality of grounding sections or the plate-shaped signal sections in at least one of a second direction or a third direction, and a plurality of connecting sections extending in the first direction and electrically connecting at least two of the plurality of grounding sections, the plate-shaped signal sections, and the line signal sections to each other, wherein the second direction intersects with the first direction, and the third direction intersects with each of the first and second directions.

Description

[Technical field]

[0001] The embodiment relates to a filter having a laminated structure. [Background technology]

[0002] When implementing a filter using multiple resonators, the matching of the filter may be reduced due to the occurrence of parasitic capacitance caused by the potential difference between grounds. Also, the size of the filter may increase due to the distance between the grounds. Furthermore, the efficiency of the inductor included in the resonator may be reduced due to the parasitic capacitance between the grounds. As the performance of the filter is reduced due to the above-mentioned various reasons, continuous research is being conducted to improve the performance of the filter. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments provide filters having laminated structures with improved performance. [Means for solving the problem]

[0004] A filter having a laminated structure according to one embodiment includes a plurality of plate-shaped ground sections stacked in a first direction, a planar signal section arranged between the plurality of ground sections facing the plurality of ground sections in the first direction, a line signal section arranged adjacent to at least one of the plurality of ground sections or the planar signal sections in at least one of a second direction or a third direction, and a plurality of connecting sections extending in the first direction and electrically connecting at least two of the plurality of ground sections, the planar signal sections, and the line signal section to each other, wherein the second direction may intersect with the first direction, and the third direction may intersect with each of the first and second directions.

[0005] For example, the plurality of grounding sections may include a bottom grounding section, a top grounding section disposed on the bottom grounding section in the first direction, a first inserted grounding section disposed adjacent to the top grounding section, a second inserted grounding section disposed adjacent to the bottom grounding section, a first separated grounding section disposed between the first inserted grounding section and the second inserted grounding section in the first direction, a third inserted grounding section disposed adjacent to the bottom grounding section and spaced apart from the second inserted grounding section in the second direction, a fourth inserted grounding section disposed adjacent to the top grounding section and spaced apart from the first inserted grounding section in the second direction, and a second separated grounding section disposed between the third inserted grounding section and the fourth inserted grounding section in the first direction, wherein the first separated grounding section is electrically connected to the first and second inserted grounding sections, and the second separated grounding section is electrically connected to the third and fourth inserted grounding sections.

[0006] For example, the planar signal portion may include a first planar signal portion spaced apart from each of the first insertion ground portion and the first isolated ground portion in the first direction and disposed between the first insertion ground portion and the first isolated ground portion, a second planar signal portion spaced apart from each of the first isolated ground portion and the second insertion ground portion in the first direction and disposed between the first isolated ground portion and the second insertion ground portion, and a third planar signal portion spaced apart from each of the first planar signal portion and the second planar signal portion in the first direction and disposed between the first planar signal portion and the second planar signal portion. a fourth plate-shaped signal portion spaced apart from each of the third insertion ground portion and the second isolated ground portion in the first direction and disposed between the third insertion ground portion and the second isolated ground portion, a fifth plate-shaped signal portion spaced apart from each of the fourth insertion ground portion and the second isolated ground portion in the first direction and disposed between the fourth insertion ground portion and the second isolated ground portion, and a sixth plate-shaped signal portion spaced apart from each of the fourth plate-shaped signal portion and the fifth plate-shaped signal portion in the first direction and disposed between the fourth plate-shaped signal portion and the fifth plate-shaped signal portion.

[0007] For example, the first to sixth plate-shaped signal portions may be disposed apart from adjacent ground portions in the first direction among the plurality of ground portions with a dielectric interposed therebetween.

[0008] For example, the first isolated ground part may have a planar shape surrounding and spaced from the third plate-shaped signal part.

[0009] For example, the second isolated ground part may have a planar shape surrounding and spaced from the sixth plate-shaped signal part.

[0010] For example, the multiple connecting portions may include a first connecting portion extending in the first direction to connect the first flat-shaped signal portion and the third flat-shaped signal portion to each other, and a second connecting portion extending in the first direction to connect the fifth flat-shaped signal portion and the sixth flat-shaped signal portion to each other.

[0011] For example, the line signal section may include a first line signal section arranged in a curved line shape extending from the first plate-shaped signal section in at least one of the second direction or the third direction, a second line signal section arranged in a curved line shape extending from a periphery of the first separated ground section in at least one of the second direction or the third direction, a third line signal section arranged in a curved line shape extending from the fourth plate-shaped signal section in at least one of the second direction or the third direction, and a fourth line signal section arranged in a curved line shape extending from the fifth plate-shaped signal section in at least one of the second direction or the third direction.

[0012] For example, the plurality of connecting parts may further include a third connecting part extending in the first direction to connect the second line signal part and the second plate-shaped signal part.

[0013] For example, the plurality of connecting portions may include a fourth connecting portion extending in the first direction and connecting the first inserted ground portion, the first separated ground portion, and the second inserted ground portion to the top ground portion and the bottom ground portion, respectively; a fifth connecting portion extending in the first direction and connecting the third inserted ground portion, the second separated ground portion, and the fourth inserted ground portion to the top ground portion and the bottom ground portion, respectively; a sixth connecting portion connecting the first line signal portion to the top ground portion and the bottom ground portion, respectively; a seventh connecting portion connecting the second line signal portion to the top ground portion and the bottom ground portion, respectively; an eighth connecting portion connecting the third line signal portion to the top ground portion and the bottom ground portion, respectively; and a ninth connecting portion connecting the fourth line signal portion to the top ground portion and the bottom ground portion, respectively.

[0014] For example, the second insertion ground portion and the third insertion ground portion may be disposed in a first layer spaced apart from each other in the second direction, the second planar signal portion, the fourth planar signal portion, and the third line signal portion may be disposed in a second layer located higher than the first layer in the first direction, the first isolated ground portion and the second isolated ground portion spaced apart from each other in the second direction, the third planar signal portion and the sixth planar signal portion, and the second line signal portion spaced apart from each other in the second direction, may be disposed in a third layer located higher than the second layer in the first direction, the first planar signal portion and the fifth planar signal portion, and the first and fourth line signal portions spaced apart from each other in the second direction, may be disposed in a fourth layer located higher than the third layer in the first direction, and the first insertion ground portion and the fourth insertion ground portion may be disposed in a fifth layer spaced apart from each other in the second direction and higher than the fourth layer in the first direction.

[0015] For example, the filter having the laminated structure may further include a plurality of fences having a strip column shape extending in the first direction, arranged adjacent to the first and fourth line signal portions, and electrically connecting the top ground portion and the bottom ground portion to each other.

[0016] For example, the plurality of fences may include a first fence adjacent to the sixth connecting portion, a second fence adjacent to the ninth connecting portion, and an intermediate fence spaced apart from each other and arranged in the second direction between the first fence and the second fence.

[0017] For example, a filter having a laminated structure according to an embodiment may have a transmission zero point corresponding to a separation distance between the first and fourth line signal parts and the number of the plurality of fences.

[0018] For example, the first line signal portion and the fourth line signal portion may have planar shapes spaced apart from each other with at least a portion of the plurality of fences interposed therebetween.

[0019] For example, the plurality of ground parts, the planar signal part and the line signal part form a plurality of resonators separated from each other, and the plurality of resonators may include a first resonator including the first insertion ground part, the first planar signal part, the third planar signal part, the first isolated ground part and the first line signal part, a second resonator including the first isolated ground part, the second planar signal part, the third planar signal part, the second insertion ground part and the second line signal part, a third resonator including the second isolated ground part, the fourth planar signal part, a sixth planar signal part, the third insertion ground part and the third line signal part, and a fourth resonator including the fourth insertion ground part, the fifth planar signal part, the sixth planar signal part, the second isolated ground part and the fourth line signal part.

[0020] For example, the filter having a laminated structure may further include a first input / output port protruding outward from one side of the first line signal section connected to the first plate-type signal section, and a second input / output port protruding outward from one side of the fourth line signal section connected to the fifth plate-type signal section.

[0021] For example, the filter having a laminated structure may further include a dielectric in which the ground parts, the plate-type signal part, the line signal part and the connecting parts are embedded.

[0022] A filter having a stacked structure according to another embodiment may include a top ground portion and a bottom ground portion arranged vertically opposite each other and spaced apart, an isolated ground portion arranged between the top ground portion and the bottom ground portion, a plurality of signal portions arranged between each of the top ground portion and the bottom ground portion and the isolated ground portion to form a resonator, and a connecting portion connecting the isolated ground portion and the plurality of signal portions to the top ground portion and the bottom ground portion, respectively. Effect of the Invention

[0023] The filter having the laminated structure according to the embodiment has excellent performance such as being compact, having a small insertion loss, being able to easily adjust the center frequency and bandwidth, and being able to accurately adjust the transmission zero point, and being able to have an extended order, so that it can be easily applied to filters having various functions and the range of application can be widened. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is an exploded perspective view of the appearance of the filter according to the embodiment.

[0025] [Diagram 2] FIG. 2 is a perspective view of the external appearance of the filter shown in FIG. 1;

[0026] [Diagram 3] FIG. 2 shows a front view of the filter shown in FIG.

[0027] [Figure 4a] FIG. 4 is a bottom view of the fifth layer in the filter shown in FIGS. 1 and 3.

[0028] [Figure 4b] FIG. 4 is a plan view of the first to fourth layers after only the fifth layer has been removed in the filter shown in FIGS. 1 and 3.

[0029] [Figure 4c] FIG. 4 is a plan view of the first to third layers of the filter shown in FIGS. 1 and 3 after the fourth and fifth layers have been removed.

[0030] [Figure 4d] FIG. 4 is a plan view of the first and second layers of the filter shown in FIGS. 1 and 3 after the third to fifth layers have been removed.

[0031] [Figure 4e] FIG. 4 is a plan view of only the first layer after the second to fifth layers have been removed in the filter shown in FIGS. 1 and 3.

[0032] [Diagram 5] FIG. 2 is a diagram illustrating an equivalent circuit of the filter shown in FIG.

[0033] [Figure 6] 11 is a graph illustrating the characteristics of a filter according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] In the following, in order to specifically explain the present invention, a description will be given based on an embodiment, and a detailed description will be given with reference to the accompanying drawings to help understand the invention. However, the embodiment according to the present invention can be modified into various other forms, and the scope of the present invention should not be interpreted as being limited to the embodiment described below. The embodiment of the present invention is provided to more completely explain the present invention to those having average knowledge in the art.

[0035] In the description of this embodiment, when a component is described as being formed "on" or "under" an element, "on" or "under" includes not only the case where both elements are in direct contact with each other, but also the case where one or more other elements are indirectly disposed between the two elements.

[0036] In addition, when the term "upper" or "lower" is used, it can mean not only the upper direction but also the lower direction based on one element.

[0037] Additionally, as used hereinafter, relational terms such as "first" and "second," "top / upper / upper side" and "bottom / lower / lower," etc. do not necessarily require or imply a certain physical or logical relationship or order between such entities or elements, but may be used to distinguish one entity or element from another entity or element.

[0038] Hereinafter, a filter having a laminated structure according to an embodiment (hereinafter referred to as a filter) will be described with reference to the accompanying drawings as follows. For convenience, the filter will be described using a Cartesian coordinate system (x-axis, y-axis, z-axis), but it goes without saying that it can also be described using other coordinate systems. For convenience, the x-axis direction is referred to as the third direction, the y-axis direction is referred to as the first direction, and the z-axis direction is referred to as the second direction. For example, if the first direction corresponds to the vertical direction, at least one of the second and third directions intersecting with the first direction may correspond to the horizontal direction.

[0039] Fig. 1 is an external exploded perspective view of a filter according to an embodiment, Fig. 2 is an external combined perspective view of the filter shown in Fig. 1, Fig. 3 is a front view of the filter shown in Fig. 1, Fig. 4a is a bottom view of the fifth layer in the filter shown in Fig. 1 and Fig. 3, Fig. 4b is a plan view of the first to fourth layers after only the fifth layer is removed in the filter shown in Fig. 1 and Fig. 3, Fig. 4c is a plan view of the first to third layers after the fourth and fifth layers are removed in the filter shown in Fig. 1 and Fig. 3, Fig. 4d is a plan view of the first and second layers after the third to fifth layers are removed in the filter shown in Fig. 1 and Fig. 3, and Fig. 4e is a plan view of only the first layer after the second to fifth layers are removed in the filter shown in Fig. 1 and Fig. 3. For convenience of explanation, the first to fourth line signal parts LS1 to LS4 shown in Fig. 1 are omitted in Fig. 3.

[0040] The filter according to the embodiment may include a top ground 110T, a bottom ground 110B, separate grounds (SG) SG1 and SG2, and a plurality of signal sections and a connection section.

[0041] The top ground portion 110T and the bottom ground portion 110B may be disposed vertically opposite to and spaced apart from each other.

[0042] Separate grounds SG1, SG2 may be disposed between the top ground 110T and the bottom ground 110B.

[0043] A plurality of signal parts may be disposed between the top ground part 110T and the bottom ground part 110B and the isolated ground parts SG1 and SG2 to form capacitors and inductors included in the resonators of the filter.

[0044] The connection part serves to connect the separated ground parts SG1 and SG2 and the plurality of signal parts to the top ground part 110T and the bottom ground part 110B, respectively.

[0045] More specifically, the configuration of the filter according to the embodiment will be described as follows.

[0046] The filter may include a plurality of ground sections, a plate signal (PS) section, a line signal (LS) section, and a plurality of connection sections.

[0047] The plurality of ground portions are stacked in a first direction, and each of the plurality of ground portions may have a plate shape, may be conductive, and may be implemented by a metal.

[0048] The multiple ground portions may include a bottom ground portion 110B, a top ground portion 110T, first and second separated ground portions SG1, SG2, and first to fourth inserted ground portions (IG) IG1, IG2, IG3, IG4.

[0049] The top contact portion 110T may be disposed on the bottom contact portion 110B in the first direction. For example, the top contact portion 110T may overlap the bottom contact portion 110B in the first direction.

[0050] The first insert ground portion IG1 may be disposed adjacent to the top ground portion 110T, and the second insert ground portion IG2 may be disposed adjacent to the bottom ground portion 110B.

[0051] The first isolated ground part SG1 is disposed between the first inserted ground part IG1 and the second inserted ground part IG2 in the first direction. The first isolated ground part SG1 serves to divide the space between the top ground part 110T and the bottom ground part 110B in the first direction. For example, the first distance by which the first isolated ground part SG1 is separated from the top ground part 110T in the first direction and the second distance by which the first isolated ground part SG1 is separated from the bottom ground part 110B in the first direction may be the same, but the embodiment is not limited thereto. That is, as described below, the first and second distances may be determined so that a capacitor included in the resonator has a desired capacitance.

[0052] The third insert ground part IG3 may be adjacent to the bottom ground part 110B and spaced apart from the second insert ground part IG2 in the second direction.

[0053] The fourth inserted ground part IG4 may be adjacent to the top ground part 110T and spaced apart from the first inserted ground part IG1 in the second direction.

[0054] The second isolated ground part SG2 may be disposed between the third inserted ground part IG3 and the fourth inserted ground part IG4 in the first direction. The second isolated ground part SG2 may be disposed apart from the first isolated ground part SG1 in the second direction. Like the first isolated ground part SG1, the second isolated ground part SG2 serves to divide the space between the top ground part 110T and the bottom ground part 110B in the first direction. For example, the third distance by which the second isolated ground part SG2 is separated from the top ground part 110T in the first direction and the fourth distance by which the second isolated ground part SG2 is separated from the bottom ground part 110B in the first direction may be the same, but the embodiment is not limited thereto. That is, as described below, the third and fourth distances may be determined so that a capacitor included in a resonator has a desired capacitance.

[0055] As described below, the first isolated ground part SG1 may be electrically connected to the first and second inserted ground parts IG1 and IG2 via connecting parts, respectively, and the second isolated ground part SG2 may be electrically connected to the third and fourth inserted ground parts IG3 and IG4 via connecting parts, respectively.

[0056] Meanwhile, the plate-shaped signal portion may be disposed between the plurality of ground portions, facing the plurality of ground portions in the first direction, and may be conductive. For example, the plate-shaped signal portion may be embodied by a metal.

[0057] The flat-plate signal section may include first to sixth flat-plate signal sections PS1 to PS6.

[0058] The first plate-shaped signal part PS1 may be spaced apart from each of the first insertion ground part IG1 and the first isolated ground part SG1 in a first direction and may be disposed between the first insertion ground part IG1 and the first isolated ground part SG1.

[0059] The second plate-shaped signal part PS2 may be spaced apart from each of the first isolated ground part SG1 and the second inserted ground part IG2 in the first direction and may be disposed between the first isolated ground part SG1 and the second inserted ground part IG2.

[0060] The third flat-shaped signal portion PS3 may be spaced apart from the first flat-shaped signal portion PS1 and the second flat-shaped signal portion PS2 in the first direction and may be disposed between the first flat-shaped signal portion PS1 and the second flat-shaped signal portion PS2.

[0061] The fourth plate-shaped signal part PS4 may be spaced apart from each of the third insertion ground part IG3 and the second isolated ground part SG2 in the first direction and may be disposed between the third insertion ground part IG3 and the second isolated ground part SG2.

[0062] The fifth plate-shaped signal part PS5 may be spaced apart from each of the fourth insertion ground part IG4 and the second isolated ground part SG2 in the first direction and may be disposed between the fourth insertion ground part IG4 and the second isolated ground part SG2.

[0063] The sixth plate-type signal portion PS6 may be spaced apart from each of the fourth plate-type signal portion PS4 and the fifth plate-type signal portion PS5 in the first direction and may be disposed between the fourth plate-type signal portion PS4 and the fifth plate-type signal portion PS5.

[0064] Here, the first to sixth plate-type signal sections PS1 to PS6 may be arranged to be spaced apart from adjacent ground sections in the first direction among the plurality of ground sections with a dielectric therebetween, in order to form a capacitor of a resonator, as described later.

[0065] According to the embodiment, the first isolated ground part SG1 may have a planar shape surrounding and spaced from the third plate-type signal part PS3. For example, referring to Fig. 3 and Fig. 4c, a gap (Gap) (hereinafter, referred to as a first gap) G1 may be formed between the first isolated ground part SG1 and the third plate-type signal part PS3. A dielectric may be disposed in the first gap G1.

[0066] Also, the second isolated ground part SG2 may have a planar shape surrounding and spaced from the sixth plate-type signal part PS6. To this end, referring to Fig. 3 and Fig. 4c, a gap (hereinafter, referred to as a second gap) G1 may be formed between the second isolated ground part SG2 and the sixth plate-type signal part PS6. A dielectric may be disposed in the second gap G2.

[0067] Meanwhile, a line signal (LS) section may be disposed adjacent to at least one of the ground sections or the plate-type signal sections in at least one of the second direction or the third direction, and may be made of a conductive material, for example, the line signal section may be made of a metal.

[0068] For example, the line signal section may include first to fourth line signal sections LS1 to LS4.

[0069] The first line signal section LS1 may be arranged in a curved line shape extending from the first plate-shaped signal section PS1 in at least one of the second direction and the third direction. In the case of the embodiment, as shown in the figure, the first line signal section LS1 may have a curved line shape extending from the first plate-shaped signal section PS1 in the second direction and the third direction.

[0070] The second line signal section LS2 may be disposed in a curved line shape extending in at least one of the second direction and the third direction from the periphery of the first isolated ground section SG1. In the embodiment, as shown in the figure, the second line signal section LS2 may have a curved line shape extending in the second direction and the third direction from the periphery of the first isolated ground section SG1.

[0071] The third line signal section LS3 may be disposed in a curved line shape extending from the fourth plate-type signal section PS4 in at least one of the second direction and the third direction. In the case of the embodiment, as shown in the figure, the third line signal section LS3 may have a curved line shape extending from the fourth plate-type signal section PS4 in the second direction and the third direction.

[0072] The fourth line signal section LS4 may be arranged in a curved line shape extending from the fifth plate-type signal section PS5 in at least one of the second direction and the third direction. In the case of the embodiment, as shown in the figure, the fourth line signal section LS4 may have a curved line shape extending from the fifth plate-type signal section PS5 in the second direction and the third direction.

[0073] Meanwhile, the plurality of connection portions (CPs) extend in a first direction and electrically connect at least two of the plurality of ground portions, the plate-type signal portions, and the line signal portions to each other. To this end, the plurality of connection portions may be implemented by a conductive metal.

[0074] According to the embodiment, the multiple connecting portions may include first to ninth connecting portions CP1 to CP9.

[0075] The first connecting part CP1 extends in a first direction and electrically connects the first plate-type signal part PS1 and the third plate-type signal part PS3 to each other, so that the first plate-type signal part PS1 and the third plate-type signal part PS3 are connected to each other by the first connecting part CP1 to form an equipotential.

[0076] The second connection part CP2 extends in the first direction and can electrically connect the fifth plate-type signal part PS5 and the sixth plate-type signal part PS6 to each other, so that the fifth plate-type signal part PS5 and the sixth plate-type signal part PS6 can be connected to each other by the second connection part CP2 to form an equipotential.

[0077] The third connection part CP3 extends in the first direction and can electrically connect the second line signal part LS2 and the second plate-type signal part PS2.

[0078] The fourth connecting part CP4 extends in a first direction and may electrically connect the first inserted ground part IG1, the first separated ground part SG1, and the second inserted ground part IG2 to the top ground part 110T and the bottom ground part 110B, respectively. To this end, the fourth connecting part CP4 may include 4-1 to 4-4th connecting parts CP41, CP42, CP43, and CP44 electrically connecting four corners of the first inserted ground part IG1, the first separated ground part SG1, and the second inserted ground part IG2 to the top ground part 110T and the bottom ground part 110B, respectively.

[0079] The fifth connecting part CP5 extends in the first direction and may electrically connect the third inserted ground part IG3, the second separated ground part SG2 and the fourth inserted ground part IG4 to the top ground part 110T and the bottom ground part 110B, respectively. To this end, the fifth connecting part CP5 may include 5-1 to 5-4 connecting parts CP51, CP52, CP53 and CP54 electrically connecting four corners of each of the third inserted ground part IG3, the second separated ground part SG2 and the fourth inserted ground part IG4 to the top ground part 110T and the bottom ground part 110B, respectively.

[0080] The sixth connecting part CP6 may electrically connect the first line signal part LS1 to the top ground part 110T and the bottom ground part 110B, respectively.

[0081] The seventh connecting part CP7 may electrically connect the second line signal part LS2 to the top ground part 110T and the bottom ground part 110B, respectively.

[0082] The eighth connecting part CP8 may electrically connect the third line signal part LS3 to the top ground part 110T and the bottom ground part 110B, respectively.

[0083] The ninth connecting part CP9 may electrically connect the fourth line signal part LS4 to the top ground part 110T and the bottom ground part 110B, respectively.

[0084] Meanwhile, the filter according to the embodiment may further include a plurality of fences (Fences) F.

[0085] The fences F may extend in a first direction, be adjacent to the first line signal portion LS1 and the fourth line signal portion LS4, and have a strip column shape that electrically connects the top ground portion 110T and the bottom ground portion 110B to each other. The fences F may be made of a conductive metal.

[0086] The plurality of fences F may include first, second and intermediate fences F1, F2 and IF. The first fence F1 may be adjacent to the sixth connector CP6, the second fence F2 may be adjacent to the ninth connector CP9, and the intermediate fences IF may be arranged in the second direction between the first fence F1 and the second fence F2 and spaced apart from each other.

[0087] As shown, the number of fences F may be thirteen, but may be more or less than thirteen as shown.

[0088] The transmission zero point of the filter according to the embodiment can be determined by the distance between the first line signal part LS1 and the fourth line signal part LS4 and the number of the fences F, which will be described in detail later.

[0089] Referring to FIG. 4b, the first line signal portion LS1 and the fourth line signal portion LS4 may have a planar shape spaced apart from each other with at least a portion of the fences F interposed therebetween.

[0090] Meanwhile, as shown in FIG. 3, the filter according to the embodiment may have a multi-layer structure, for example, a five-layer structure.

[0091] The layers are sequentially referred to as the first layer LY1 to the fifth layer LY5 from bottom to top in the first direction. That is, the second layer LY2 is located higher than the first layer LY1 in the first direction, the third layer LY3 is located higher than the second layer LY2 in the first direction, the fourth layer LY4 is located higher than the third layer LY3 in the first direction, and the fifth layer LY5 is located higher than the fourth layer LY4 in the first direction.

[0092] The first layer LY1 has a second insertion ground portion IG2 and a third insertion ground portion IG3 spaced apart from each other in the second direction.

[0093] The second layer LY2 is provided with a second signal plate section PS2, a fourth signal plate section PS4, and a third line signal section LS3 spaced apart from each other in the second direction.

[0094] The third layer LY3 is arranged with a first isolated ground section SG1 and a second isolated ground section SG2 spaced apart from each other in the second direction, a third plate-type signal section PS3 and a sixth plate-type signal section PS6 spaced apart from each other in the second direction, and a second line signal section LS2.

[0095] The fourth layer LY4 is provided with a first plate-type signal section PS1, a fifth plate-type signal section PS5, and first and fourth line signal sections LS1 and LS4 spaced apart from each other in the second direction.

[0096] On the fifth layer LY5, a first insertion ground part IG1 and a fourth insertion ground part IG4 are arranged to be spaced apart from each other in the second direction.

[0097] The filter according to an embodiment includes at least one unit module, and the unit module may include a plurality of resonators. That is, the above-mentioned plurality of ground parts, plate-type signal parts, and line signal parts may form a plurality of resonators separated from each other. One unit module may have a configuration as shown in FIG.

[0098] A filter according to another embodiment may include a plurality of unit modules arranged in at least one of the first to third directions, and each of the plurality of unit modules may have the configuration shown in FIG.

[0099] The multiple resonators may include first to fourth resonators.

[0100] The first resonator may include a first insertion ground section IG1, a first plate-shaped signal section PS1, a third plate-shaped signal section PS3, a first isolated ground section SG1, and a first line signal section LS1.

[0101] The second resonator may include a first isolated ground part SG1, a second planar signal part PS2, a third planar signal part PS3, a second inserted ground part IG2, and a second line signal part LS2. Also, the third connection part CP3 may belong to the second resonator.

[0102] The third resonator may include a second isolated ground section SG2, a fourth signal plate section PS4, a sixth signal plate section PS6, a third inserted ground section IG3, and a third line signal section LS3.

[0103] The fourth resonator may include a fourth insertion ground portion IG4, a fifth signal plate portion PS5, a sixth signal plate portion PS6, a second isolated ground portion SG2, and a fourth line signal portion LS4.

[0104] The filter according to the embodiment may include a dielectric. The ground parts, the plate-type signal parts, the line signal parts, and the connecting parts may be embedded in the dielectric. Therefore, in Figs. 1 to 4e, the background parts between the ground parts, the plate-type signal parts, the line signal parts, and the connecting parts may correspond to the dielectric.

[0105] In particular, as described above, in order to embody the capacitors included in the first to fourth resonators in the structure shown in FIG. 1, a dielectric may be disposed between the portions of the ground parts and the plate-type signal parts that face each other. In this case, the connecting parts and the fences may be embedded in the dielectric in the form of vias. In this case, the vias may be stacked vias rather than through vias.

[0106] For example, the dielectric can be manufactured by the Low Temperature Co-fired Ceramics (LTCC) process.

[0107] The operation of the filter according to the above-mentioned embodiment will now be described with reference to the accompanying drawings.

[0108] FIG. 5 shows an equivalent circuit of the filter shown in FIG.

[0109] The capacitors and inductors included in the resonator shown in Figure 1 are distributed constant circuits, but to help understand the operation of the filter shown in Figure 1, they are interpreted as lumped constant circuits in Figure 5.

[0110] The filter shown in FIG. 5 may include first to fourth resonators 202, 204, 206, and 208.

[0111] The first resonator 202 may include a first inductor L1 and a first capacitor C1, the second resonator 204 may include a second inductor L2 and a second capacitor C2, the third resonator 206 may include a third inductor L3 and a third capacitor C3, and the fourth resonator 208 may include a fourth inductor L4 and a fourth capacitor C4.

[0112] Moreover, the filter shown in FIG. 5 may further include fifth to seventh capacitors C5, C6, and C7 and fifth to ninth inductors L5, L6, L7, L8, and L9.

[0113] 5 may further include first and second input / output ports PT1, PT2. For example, the first input / output port PT1 may be an input terminal of the filter and the second input / output port PT2 may be an output terminal of the filter, or the first input / output port PT1 may be an output terminal of the filter and the second input / output port PT2 may be an input terminal of the filter.

[0114] First, the first to seventh capacitors C1, C2, C3, C4, C5, C6, and C7 included in the resonators 202, 204, 206, and 208 will be described with reference to FIGS. 1 and 3 as follows.

[0115] The first inserted ground section IG1 and the first plate-type signal section PS1 face each other with a dielectric therebetween to form the 1-1 capacitor C11, and the first plate-type signal section PS1 and the first isolated ground section SG1 face each other with a dielectric therebetween to form the 1-2 capacitor C12. Here, the first capacitor C1 shown in FIG. 3 may include the capacitance components of the 1-1 and 1-2 capacitors C11 and C12. For example, the first capacitor C1 shown in FIG. 5 may correspond to the first capacitor C1 shown in FIG. 3, but the embodiment is not limited thereto. That is, the first capacitor C1 shown in FIG. 5 may also include a capacitance component formed by the third plate-type signal section PS3 and the first isolated ground section SG1 facing each other with a dielectric therebetween.

[0116] The first isolated ground section SG1 and the second plate-type signal section PS2 face each other with a dielectric therebetween to form the 2-1 capacitor C21, and the second plate-type signal section PS2 and the second inserted ground section IG2 face each other with a dielectric therebetween to form the 2-2 capacitor C22. Here, the second capacitor C2 shown in FIG. 3 may include the capacitance components of the 2-1 and 2-2 capacitors C21 and C22. For example, the second capacitor C2 shown in FIG. 5 may correspond to the second capacitor C2 shown in FIG. 3, but the embodiment is not limited thereto. That is, the second capacitor C2 shown in FIG. 5 may also include a capacitance component formed by the third plate-type signal section PS3 and the first isolated ground section SG1 facing each other with a dielectric therebetween.

[0117] The second isolated ground section SG2 and the fourth plate-type signal section PS4 face each other with a dielectric therebetween to form the 3-1 capacitor C31, and the fourth plate-type signal section PS4 and the third inserted ground section IG3 face each other with a dielectric therebetween to form the 3-2 capacitor C32. Here, the third capacitor C2 shown in FIG. 3 may include the capacitance components of the 3-1 and 3-2 capacitors C31 and C32. For example, the third capacitor C3 shown in FIG. 5 may correspond to the third capacitor C3 shown in FIG. 3, but the embodiment is not limited thereto. That is, the third capacitor C3 shown in FIG. 5 may also include a capacitance component formed by the sixth plate-type signal section PS6 and the second isolated ground section SG2 facing each other with a dielectric therebetween.

[0118] The fourth inserted ground part IG4 and the fifth plate-type signal part PS5 face each other with a dielectric therebetween to form the 4-1 capacitor C41, and the fifth plate-type signal part PS5 and the second isolated ground part SG2 face each other with a dielectric therebetween to form the 4-2 capacitor C42. Here, the fourth capacitor C4 shown in FIG. 3 may include the capacitance components of the 4-1 and 4-2 capacitors C41 and C42. For example, the fourth capacitor C4 shown in FIG. 5 may correspond to the fourth capacitor C4 shown in FIG. 3, but the embodiment is not limited thereto. That is, the fourth capacitor C4 shown in FIG. 5 may also include a capacitance component formed by the sixth plate-type signal part PS6 and the second isolated ground part SG2 facing each other with a dielectric therebetween.

[0119] Also, a fifth capacitor C5 shown in Fig. 5 may be formed by a multi-coupling, i.e., an electrical coupling, between the first capacitor C1 and the second capacitor C2 shown in Fig. 3. For example, the fifth capacitor C5 formed by the first plate-shaped signal part PA1 and the second plate-shaped signal part PA2 shown in Fig. 3 facing each other in the first direction may correspond to the fifth capacitor C5 shown in Fig. 5.

[0120] The parasitic capacitance between the second line signal part LS2 and the third line signal part LS3 shown in FIG. 1 may be equivalent to the sixth capacitor C6 shown in FIG. 5. That is, the capacitance of the sixth capacitor C6 may be formed by the potential difference between the second line signal part LS2 and the third line signal part LS3. The internal parasitic capacitance component of the second line signal part LS2 is included in the second capacitor C2, and the internal parasitic capacitance component of the third line signal part LS3 is included in the third capacitor C3. Each of the second and third line signal parts LS2 and LS3 mainly has an inductance component, but also has a capacitance component. The sixth capacitor C6 may be realized by such a capacitance component, and the capacitance component of the sixth capacitor C6 is very small. In this way, the filter according to the embodiment may be used in a resonator without removing the parasitic capacitance component.

[0121] A seventh capacitor C7 shown in Fig. 5 may be formed by multiple coupling, i.e., electrical coupling, between the third capacitor C3 and the fourth capacitor C4 shown in Fig. 3. For example, the seventh capacitor C7 formed by the fifth plate-shaped signal part PA5 and the fourth plate-shaped signal part PA4 shown in Fig. 3 facing each other in the first direction may correspond to the seventh capacitor C7 shown in Fig. 5.

[0122] Moreover, the first to ninth inductors L1, L2, L3, L4, L5, L6, L7, L8, and L9 included in the resonators 202, 204, 206, and 208 will be described below with reference to FIG.

[0123] The first inductor L1 shown in FIG. 5 can be realized by shorting the ends of the first line signal section LS1 arranged on the fourth layer LY4 together with the first plate-type signal section PS1 shown in FIG.

[0124] Also, the second line signal section LS2 may be short-circuited to implement the second inductor L2 shown in Fig. 5. Here, the third connection section CP3 connecting the second line signal section LS2 and the second plate-type signal section PS2 may implement the second inductor L2.

[0125] The third inductor L3 shown in FIG. 5 can be implemented by shorting an end of the third line signal section LS3 arranged on the second layer LY2 together with the fourth plate-type signal section PS4.

[0126] The fourth inductor L4 shown in FIG. 5 can be implemented by shorting an end of the fourth line signal unit LS4 arranged on the fourth layer LY4 together with the fifth plate-type signal unit PS5.

[0127] The fifth inductor L5 may be realized by a parasitic value of the fifth capacitor C5, and the seventh inductor L7 may be realized by a parasitic value of the seventh capacitor C7. The fifth and seventh inductors L5 and L7 may be realized by mutual inductance due to magnetic coupling caused by the parasitic inductance components included in the fifth and seventh capacitors C5 and C7, and may have a very small value.

[0128] The sixth inductor L6 may be realized by a mutual inductance due to magnetic coupling between the second line signal part LS2 and the third line signal part LS3. That is, the inductance coupling between the second resonator 204 and the third resonator 206 may be reflected in the sixth inductor L6.

[0129] Also, referring to Figures 1 and 5, the eighth inductor L8 has an inductance component located between the first input / output port PT1 and the first line signal section LS1, and the ninth inductor L9 has an inductance component located between the second input / output port PT2 and the fourth line signal section LS4.

[0130] For example, as shown in FIGS. 1 and 2, the first input / output port PT1 may have a shape that protrudes outward from one side of the first line signal section LS1 connected to the first plate-type signal section PS1, and the second input / output port PT2 may have a shape that protrudes outward from one side of the fourth line signal section LS4 connected to the fifth plate-type signal section PS5, but the embodiment is not limited to specific positions of the first and second input / output ports PT1 and PT2.

[0131] Hereinafter, filters according to comparative examples and examples will be described with reference to the accompanying drawings as follows.

[0132] In the filter according to the comparative example, the top ground part 110T is not present and is open, so noise generated inside the filter is radiated to the outside, whereas in the filter according to the embodiment, noise inside the filter can be removed through the ground.

[0133] The filter according to the embodiment may include only one unit module as shown in Figure 1. In this case, the number of resonators 202, 204, 206, and 208 is four, so the filter according to the embodiment is a fourth-order filter.

[0134] A filter according to another embodiment may include a plurality of unit modules arranged in an array form in at least one of the first, second, and third directions, as shown in Fig. 1. In this case, the order of the filter according to the embodiment may be extended to 10th to 20th orders. As such, since the filter according to the embodiment has a laminated structure, it can be extended to a multi-order filter and can be used as a SAW (Surface Acoustic Wave) filter and a BAR commercial filter.

[0135] In the comparative example, the size of the filter increases due to the distance between the grounds, whereas in the embodiment, the grounds are inserted inside the structure, i.e., the first and second isolated ground parts SG1 and SG2 are disposed on the third layer LY3 among the five layers LY1 to LY5, so that the size of the filter can be smaller than that of the comparative example.

[0136] 6 is a graph for explaining the characteristics of the filter according to the embodiment, where the horizontal axis indicates frequency and the vertical axis indicates insertion loss, where reference numeral 302 indicates the characteristics of the filter according to the comparative example, and 300 indicates the characteristics of the filter according to the embodiment.

[0137] The filters according to the comparative example and the embodiment are bandpass filters.

[0138] A reverse mutual inductance component -M exists between the first line signal section LS1 and the fourth line signal section LS4, and cross-coupling is provided between the first line signal section LS1 and the fourth line signal section LS4, so that the stopband of the filter can be adjusted as desired.

[0139] The larger the mutual inductance M, the closer the transmission zeros fl and fh are to the passband. By using multiple fences F as shown in Figure 1, for example by adjusting the number of fences F, the degree of coupling can be precisely adjusted, thereby accurately forming the transmission zeros fl and fh in the desired band.

[0140] That is, the first and second transmission zeros fl and fh shown in FIG. 6 can be determined by the coupling between the first line signal section LS1 and the fourth line signal section LS4, i.e., the interval between the first line signal section LS1 and the fourth line signal section LS4 and the number of the plurality of fences F. When the coupling is stronger, the transmission zeros fl and fh approach the center frequency fc. As the number of the plurality of fences F increases, the coupling becomes weaker. That is, when the number of the plurality of fences F increases, the negative coupling decreases, and the transmission zeros fl and fh can move away from the center frequency fc.

[0141] As shown in FIG. 1, the first and fourth line signal sections LS1 and LS4 are formed long because the inductance of each of the first and fourth line signal sections LS1 and LS4 is reduced by negative coupling. Meanwhile, the first and fourth line signal sections LS1 and LS4 are coupled to a wide area, so that the insertion loss can be reduced compared to the comparative example.

[0142] Furthermore, when the distance in the first direction between the plate-shaped signal parts forming each of the first to fourth capacitors C1 to C4 shown in Fig. 5 increases, the capacitance of each decreases, and the center frequency fc shown in Fig. 6 can shift to the higher frequency side. Therefore, according to the embodiment, the center frequency fc of the filter can be varied by adjusting the distance in the first direction between the plate-shaped signal parts.

[0143] 5 are coupling amounts, the bandwidth of the filter can be reduced by reducing these capacitances. Therefore, according to the embodiment, the bandwidth of the filter can be varied by adjusting the capacitances of the fifth to seventh capacitors C5 to C7.

[0144] Also, as shown in Fig. 1, if the second line signal section LS2 and the second plate-type signal section PS2 are not connected by the third connection part CP3, the same layer will have a horizontal connection structure instead of a vertical connection, which may significantly increase loss. However, according to the embodiment, as shown in Fig. 1, the second line signal section LS2 and the second plate-type signal section PS2 are connected by the third connection part CP3, thereby reducing loss.

[0145] Furthermore, when the portions corresponding to the layers are arranged in the form shown in FIG. 1, the coupling of the inductors becomes small, and the insertion loss can be reduced.

[0146] The above description is based on the embodiments, but these are merely illustrative and do not limit the present invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. Such modifications and differences in applications should be interpreted as being included in the scope of the present invention defined in the appended claims. MODE FOR CARRYING OUT THEINVENTION

[0147] The embodiment of the invention has been fully described in the above detailed description. [Industrial Applicability]

[0148] The filter having the laminated structure according to the embodiment can be used in various electronic devices.

Claims

1. A plurality of ground portions each having a plate shape and stacked in a first direction; a plate-shaped signal portion disposed between the plurality of grounding portions and facing the plurality of grounding portions in the first direction; a line signal portion disposed adjacent to at least one of the plurality of ground portions or the plate-shaped signal portion in at least one of a second direction and a third direction; a plurality of connecting portions extending in the first direction and electrically connecting at least two of the plurality of grounding portions, the plate-shaped signal portion, and the line signal portion to each other; The filter has a laminated structure, wherein the second direction intersects with the first direction, and the third direction intersects with both the first and second directions.

2. The plurality of ground portions include A bottom grounding portion; a top ground portion disposed on the bottom ground portion in the first direction; a first insert ground portion disposed adjacent to the top ground portion; a second insert ground portion disposed adjacent to the bottom ground portion; a first isolated ground portion disposed between the first insertion ground portion and the second insertion ground portion in the first direction; a third insertion ground portion adjacent to the bottom ground portion and spaced apart from the second insertion ground portion in the second direction; a fourth insertion ground portion adjacent to the top ground portion and spaced apart from the first insertion ground portion in the second direction; a second isolated ground portion disposed between the third insertion ground portion and the fourth insertion ground portion in the first direction, the first isolated ground part is electrically connected to the first and second inserted ground parts; The filter having a laminated structure as claimed in claim 1 , wherein the second isolated ground part is electrically connected to the third and fourth inserted ground parts.

3. The plate-shaped signal unit includes: a first plate-shaped signal portion disposed between the first insertion ground portion and the first isolated ground portion and spaced apart from the first insertion ground portion and the first isolated ground portion in the first direction; a second plate-shaped signal portion disposed between the first isolated ground portion and the second inserted ground portion and spaced apart from the first isolated ground portion and the second inserted ground portion in the first direction; a third flat signal portion disposed between the first flat signal portion and the second flat signal portion and spaced apart from the first flat signal portion and the second flat signal portion in the first direction; a fourth plate-shaped signal portion disposed between the third insertion ground portion and the second isolated ground portion and spaced apart from the third insertion ground portion and the second isolated ground portion in the first direction; a fifth plate-shaped signal portion disposed between the fourth insertion ground portion and the second isolated ground portion and spaced apart from the fourth insertion ground portion and the second isolated ground portion in the first direction; 3. The filter having a laminated structure according to claim 2, further comprising: a sixth plate-shaped signal portion spaced apart from each of the fourth plate-shaped signal portion and the fifth plate-shaped signal portion in the first direction and disposed between the fourth plate-shaped signal portion and the fifth plate-shaped signal portion.

4. 4. The filter having a laminated structure according to claim 3, wherein the first to sixth plate-shaped signal sections are arranged separated from adjacent ground sections in the first direction among the plurality of ground sections by a dielectric.

5. The filter having a laminated structure according to claim 3 , wherein the first isolated ground portion has a planar shape surrounding and spaced from the third plate-shaped signal portion.

6. The filter having a laminated structure according to claim 3 , wherein the second isolated ground portion has a planar shape surrounding and spaced from the sixth plate-shaped signal portion.

7. The plurality of connecting portions are a first connecting portion extending in the first direction and connecting the first flat signal portion and the third flat signal portion to each other; The filter having a laminated structure according to claim 3 , further comprising: a second connecting portion extending in the first direction to connect the fifth flat-shaped signal portion and the sixth flat-shaped signal portion to each other.

8. The line signal unit includes: a first line signal portion extending from the first plate-shaped signal portion in at least one of the second direction and the third direction and arranged in a curved line shape; a second line signal portion disposed in a curved line shape extending from a periphery of the first isolated ground portion in at least one of the second direction and the third direction; a third line signal portion extending from the fourth plate-shaped signal portion in at least one of the second direction and the third direction and arranged in a curved line shape; and a fourth line signal portion arranged in a curved line shape extending from the fifth plate-shaped signal portion in at least one of the second direction and the third direction.

9. 9. The filter having a laminated structure according to claim 8, wherein the plurality of connecting parts further include a third connecting part extending in the first direction and connecting the second line signal part and the second plate-shaped signal part.

10. a top ground portion and a bottom ground portion disposed vertically opposite and spaced apart from each other; an isolated ground disposed between the top ground and the bottom ground; a plurality of signal sections disposed between the top ground section and the bottom ground section and the isolated ground section to form a resonator; a connection portion connecting the isolated ground portion and the plurality of signal portions to the top ground portion and the bottom ground portion, respectively.

Images