LC filter

Abstract

Improves the adjustment accuracy of the characteristics of the LC filter. The first electrode (131) is connected to the first conducting conductor (V1) between the two ends of the first conducting conductor (V1). The second electrode (132) is connected to the second conducting conductor (V2) between the two ends of the second conducting conductor (V2). The third electrode (134) is connected to the third conducting conductor (V4) between the two ends of the third conducting conductor (V4). When viewed from the stacking direction (Z), the second conducting conductor (V2) and the fourth conducting conductor (V3) are respectively arranged on both sides of the dotted line (VL1) connecting the first conducting conductor (V1) and the third conducting conductor (V4). The second electrode (132) is opposite to the first electrode (131) and is opposite to the third electrode (134).

Description

Technical Field

[0001] The present invention relates to an LC filter including a plurality of LC resonators. Background Art

[0002] LC filters with multiple LC resonators are known. For example, International Publication No. 2018 / 100923 (Patent Document 1) discloses a bandpass filter in which four LC resonators are arranged in a staggered pattern, with each LC resonator adjacent to at least two other LC resonators. This staggered arrangement of the four LC resonators enhances magnetic coupling between the LC resonators compared to a linear arrangement, thereby expanding the passband of the bandpass filter.

[0003] Patent Document 1: International Publication No. 2018 / 100923

[0004] The characteristics of the LC filter need to be adjusted depending on the communication system in which it is used. To adjust the characteristics of the LC filter disclosed in Patent Document 1, for example, it is necessary to change the structure of the LC resonator by changing the arrangement of the inductor included in the LC resonator and the capacitance value of the capacitor included in the LC resonator.

[0005] In miniaturized LC filters, the design space available for LC resonator placement is limited. Changes in the LC resonator structure within this limited design space can affect the entire design space, potentially causing the LC filter's characteristics to deviate from the desired characteristics. Therefore, in the LC filter disclosed in Patent Document 1, there is room for improvement in the accuracy with which the LC filter's characteristics can be adjusted. Summary of the Invention

[0006] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve the adjustment accuracy of the characteristics of an LC filter.

[0007] In an LC filter according to one embodiment of the present invention, multiple dielectric layers are stacked in a stacking direction. The LC filter includes a first LC resonator, a second LC resonator, a third LC resonator, and a fourth LC resonator. The first LC resonator includes a first via conductor and at least one first electrode. The first via conductor extends in the stacking direction. The first electrode is connected to the first via conductor between its ends. The second LC resonator includes a second via conductor and at least one second electrode. The second via conductor extends in the stacking direction. The second electrode is connected to the second via conductor between its ends. The third LC resonator includes a third via conductor and at least one third electrode. The third via conductor extends in the stacking direction. The third electrode is connected to the third via conductor between its ends. The fourth LC resonator includes a fourth via conductor. The fourth via conductor extends in the stacking direction. When viewed from above in the stacking direction, the second and fourth via conductors are respectively arranged on either side of an imaginary line connecting the first and third via conductors. The second electrode is opposite the first electrode and also opposite the third electrode.

[0008] According to the LC filter of one embodiment of the present invention, the second electrode faces the first electrode and the third electrode, thereby improving the accuracy of adjusting the characteristics of the LC filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is an equivalent circuit diagram of a bandpass filter as an example of the LC filter according to the first embodiment.

[0010] Figure 2 yes Figure 1 A three-dimensional diagram of the bandpass filter.

[0011] Figure 3 Looking down from the Z axis Figure 2 Figure 2 is a diagram of the upper surface of a bandpass filter.

[0012] Figure 4 Looking down from the X-axis Figure 2 Figure 5. A side view of a bandpass filter.

[0013] Figure 5 This is a perspective view of the appearance of a bandpass filter as an example of an LC filter according to Modification 1 of Embodiment 1.

[0014] Figure 6 Looking down from the X-axis Figure 5 Figure 5. A side view of a bandpass filter.

[0015] Figure 7 This is a perspective view of the appearance of a bandpass filter as an example of an LC filter according to a second modification of the first embodiment.

[0016] Figure 8 Looking down from the Y axis Figure 7 Figure 5. A side view of a bandpass filter.

[0017] Figure 9 This is an equivalent circuit diagram of a bandpass filter as an example of an LC filter according to Modification 3 of Embodiment 1.

[0018] Figure 10 yes Figure 9 A three-dimensional diagram of the bandpass filter.

[0019] Figure 11 Looking down from the Y axis Figure 10 Figure 5. A side view of a bandpass filter.

[0020] Figure 12 This is an equivalent circuit diagram of a bandpass filter as an example of the LC filter according to the second embodiment.

[0021] Figure 13 Looking down from the Z axis Figure 12 Diagram of a bandpass filter.

[0022] Figure 14 This is an equivalent circuit diagram of a bandpass filter as an example of the LC filter according to the third embodiment.

[0023] Figure 15 Looking down from the Z axis Figure 14 Diagram of a bandpass filter.

[0024] Figure 16 This is a diagram showing a bandpass filter as an example of an LC filter according to a fourth embodiment, viewed from above in the Z-axis direction.

[0025] Figure 17 This is a perspective view of the appearance of a bandpass filter as an example of the LC filter according to the fifth embodiment.

[0026] Figure 18 Looking down from the X-axis Figure 17 Diagram of a bandpass filter.

[0027] Figure 19 It is shown together Figure 17 The pass characteristics of the bandpass filter (solid line) and Figure 2 Graph of the pass characteristics (dashed line) of the bandpass filter.

[0028] Figure 20 It is shown together Figure 17 The reflection characteristics of the bandpass filter (solid line) and Figure 2 Graph of the reflection characteristics (dashed line) of the bandpass filter.

[0029] Figure 21 It means to make Figure 18 Graph showing changes in the transmission characteristics of the bandpass filter when the distance between the dielectric layer and the adjustment electrode is changed.

[0030] Figure 22 This is a diagram showing an electrode structure of a bandpass filter according to a first modification of the fifth embodiment.

[0031] Figure 23 Looking down from the Y axis Figure 22 Diagram of the electrode structure of a bandpass filter.

[0032] Figure 24 This is a diagram showing an electrode structure of a bandpass filter according to a second modification of the fifth embodiment.

[0033] Figure 25 This is a diagram showing an electrode structure of a bandpass filter according to a third modification of the fifth embodiment.

[0034] Figure 26 This is a diagram showing an electrode structure of a bandpass filter according to a fourth modification of the fifth embodiment.

[0035] Figure 27 This is a diagram showing an electrode structure of a bandpass filter according to a fifth modification of the fifth embodiment. DETAILED DESCRIPTION

[0036] Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings. In addition, the same reference numerals are attached to the same or corresponding parts in the drawings, and their description will not be repeated in principle.

[0037] [Implementation Method 1]

[0038] Figure 1 FIG. 1 is an equivalent circuit diagram of a bandpass filter 1 as an example of an LC filter according to the first embodiment. Figure 1 As shown, bandpass filter 1 includes input / output terminals P1 and P2, LC parallel resonators LC1 to LC4, capacitors C12, C13, C23, C24, and C34. Hereinafter, the wavelength corresponding to the operating frequency of the bandpass filter (e.g., the center frequency of the passband) is denoted as λ. Furthermore, the LC filter of the embodiment may also include an LC series resonator.

[0039] LC parallel resonator LC1 is connected to input / output terminal P1. LC parallel resonator LC4 is connected to input / output terminal P2. Alternatively, LC parallel resonator LC1 may be indirectly connected to input / output terminal P1 via an inductor or capacitor. Similarly, LC parallel resonator LC4 may be indirectly connected to input / output terminal P2 via an inductor or capacitor.

[0040] The LC parallel resonators LC2 and LC3 are arranged between the LC parallel resonators LC1 and LC4. The LC parallel resonators LC1 to LC4 are sequentially coupled according to the strength of magnetic coupling and capacitive coupling described later, thereby forming a four-stage LC filter.

[0041] Capacitor C12 is connected between the LC parallel resonators LC1 and LC2. Capacitor C12 represents capacitive coupling between the LC parallel resonators LC1 and LC2.

[0042] Capacitor C13 is connected between the LC parallel resonators LC1 and LC3. Capacitor C13 represents capacitive coupling between the LC parallel resonators LC1 and LC3.

[0043] Capacitor C23 is connected between the LC parallel resonators LC2 and LC3. Capacitor C23 represents capacitive coupling between the LC parallel resonators LC2 and LC3.

[0044] Capacitor C24 is connected between the LC parallel resonators LC2 and LC4. Capacitor C24 represents capacitive coupling between the LC parallel resonators LC2 and LC4.

[0045] Capacitor C34 is connected between the LC parallel resonators LC3 and LC4. Capacitor C34 represents capacitive coupling between the LC parallel resonators LC3 and LC4.

[0046] The LC parallel resonator LC1 (first LC resonator) includes an inductor L1 and a capacitor C1. The inductor L1 and the capacitor C1 are connected in parallel between a ground point and a connection point between the input / output terminal P1 and the capacitor C12.

[0047] The LC parallel resonator LC2 (second LC resonator) includes an inductor L2 and a capacitor C2. The inductor L2 and the capacitor C2 are connected in parallel between the ground point and the connection point of the capacitors C12 and C23.

[0048] The LC parallel resonator LC3 (fourth LC resonator) includes an inductor L3 and a capacitor C3. The inductor L3 and the capacitor C3 are connected in parallel between the ground point and the connection point of the capacitors C23 and C34.

[0049] The LC parallel resonator LC4 (third LC resonator) includes an inductor L4 and a capacitor C4. The inductor L4 and the capacitor C4 are connected in parallel between the ground point and the connection point between the capacitor C34 and the input / output terminal P2.

[0050] Figure 2 yes Figure 1 The appearance of the bandpass filter 1 is shown in FIG. Figure 2In the embodiment, the X-axis, Y-axis, and Z-axis are orthogonal to each other. Figures 3 to 8 、 Figure 10 、 Figure 11 、 Figure 13 、 Figure 15 ,as well as Figure 16 The same is true in Chinese.

[0051] Reference Figure 2 The bandpass filter 1 is a laminated body in which a plurality of dielectric layers are stacked in the Z-axis direction (stacking direction). The bandpass filter 1 is, for example, in the shape of a rectangular parallelepiped. The surfaces of the bandpass filter 1 perpendicular to the Z-axis direction are defined as the bottom surface BF and the top surface UF. Among the surfaces parallel to the stacking direction, the surfaces along the YZ plane are defined as side surfaces SF1 and SF3. Among the surfaces along the stacking direction, the surfaces along the ZX plane are defined as side surfaces SF2 and SF4.

[0052] A side surface electrode 105 is arranged on the side surface SF1. The side surface electrode 105 forms the input / output terminal P1. A side surface electrode 106 is arranged on the side surface SF3. The side surface electrode 106 forms the input / output terminal P2.

[0053] Ground terminals 101 and 102 are arranged on the bottom surface BF. Ground terminals 151 and 152 are arranged on the upper surface UF. A side electrode 103 is arranged on the side surface SF2. The side electrode 103 connects the ground terminals 101 and 151. A side electrode 104 is arranged on the side surface SF4. The side electrode 104 connects the ground terminals 102 and 152. The ground terminals 101, 102, 151, and 152 are connected to the Figure 1 corresponding to the grounding point.

[0054] A ground electrode 111 (first ground electrode) and a ground electrode 141 (second ground electrode) are arranged within the bandpass filter 1. Ground electrode 111 faces bottom surface BF. Ground electrode 141 faces top surface UF. Capacitor electrodes 121-124, via conductors V1-V4, and planar electrodes 131-134 are arranged between ground electrodes 111 and 141.

[0055] Capacitor electrode 121 (first capacitor electrode) is connected to side electrode 105. Capacitor electrode 121 faces ground electrode 111. Capacitor electrode 121 and ground electrode 111 form capacitor C1. Capacitor electrode 121 and ground electrode 141 are connected via via conductor V1 (first via conductor) extending in the Z-axis direction.

[0056] The via conductor V1 forms an inductor L1. One end of the via conductor V1 is connected to the capacitor electrode 121. The via conductor V1 is an open end that is DC-insulated from the ground electrode 111 by the capacitor electrode 121. The LC parallel resonator LC1 is a λ / 4 resonator. The length of the via conductor V1 is approximately equal to λ / 4.

[0057] The capacitor electrode 122 (second capacitor electrode) faces the ground electrode 111. The capacitor electrode 122 and the ground electrode 111 form a capacitor C2. The capacitor electrode 122 and the ground electrode 141 are connected by a via conductor V2 (second via conductor) extending in the Z-axis direction.

[0058] The via conductor V2 forms an inductor L2. One end of the via conductor V2 is connected to the capacitor electrode 122. The via conductor V2 is an open end that is DC-insulated from the ground electrode 111 by the capacitor electrode 122. The LC parallel resonator LC2 is a λ / 4 resonator. The length of the via conductor V2 is approximately equal to λ / 4.

[0059] Capacitor electrode 123 (fourth capacitor electrode) faces ground electrode 111. Capacitor electrode 123 and ground electrode 111 form capacitor C3. Capacitor electrode 123 and ground electrode 141 are connected via via conductor V3 (fourth via conductor) extending in the Z-axis direction. Capacitor electrode 123 faces capacitor electrode 122 in the Y-axis direction. Capacitor electrodes 122 and 123 form capacitor C23.

[0060] The via conductor V3 forms an inductor L3. One end of the via conductor V3 is connected to the capacitor electrode 123. The via conductor V3 is an open end that is DC-insulated from the ground electrode 111 by the capacitor electrode 123. The LC parallel resonator LC3 is a λ / 4 resonator. The length of the via conductor V3 is approximately equal to λ / 4.

[0061] Capacitor electrode 124 (third capacitor electrode) is connected to side electrode 106. Capacitor electrode 124 faces ground electrode 111. Capacitor electrode 124 and ground electrode 111 form capacitor C4. Capacitor electrode 124 and ground electrode 141 are connected via via conductor V4 (third via conductor) extending in the Z-axis direction.

[0062] Via conductor V4 forms inductor L4. One end of via conductor V4 is connected to capacitor electrode 124. Via conductor V4 is open and DC-insulated from ground electrode 111 by capacitor electrode 124. LC parallel resonator LC4 is a λ / 4 resonator. The length of via conductor V4 is approximately equal to λ / 4.

[0063] The planar electrode 131 (first electrode) is connected to the via conductor V1 between its two ends. The planar electrode 132 (second electrode) is connected to the via conductor V2 between its two ends. The planar electrode 133 (fourth electrode) is connected to the via conductor V3 between its two ends. The planar electrode 134 (third electrode) is connected to the via conductor V4 between its two ends.

[0064] At least a portion of one side of the planar electrode 132 faces at least a portion of one side of each of the planar electrodes 131 and 134 in the Y-axis direction. The planar electrodes 131 and 132 form a capacitor C12. The planar electrodes 132 and 134 form a capacitor C24.

[0065] At least a portion of one side of the planar electrode 133 faces at least a portion of one side of each of the planar electrodes 131 and 134 in the Y-axis direction. The planar electrodes 131 and 133 form a capacitor C13. The planar electrodes 133 and 134 form a capacitor C34.

[0066] Figure 3 Looking down from the Z axis Figure 2 FIG. 1 is a diagram of the upper surface UF of the bandpass filter 1. Figure 3 As shown, via conductors V2 and V3 are arranged on either side of a dashed line VL1 connecting via conductors V1 and V4. That is, via conductors V1 and V4 are located on dashed line VL1, while via conductors V2 and V3 are not. Via conductor V2 is arranged on one side of dashed line VL1, and via conductor V3 is arranged on the other side. When viewing bandpass filter 1 from above in the Y-axis direction, via conductors V2 and V3 are sandwiched between via conductors V1 and V4.

[0067] Generally speaking, each LC resonator couples to other LC resonators through magnetic and capacitive coupling. The strength of these couplings is determined by the shape and position of each LC resonator. The LC resonators are sequentially coupled based on the strength of the combined magnetic and capacitive coupling, forming an LC filter.

[0068] For example, in Embodiment 1, it is assumed that magnetic coupling is superior to capacitive coupling. The distance between via conductors V1 and V2 is shorter than the distance between via conductors V1 and V3. Therefore, the magnetic coupling between LC parallel resonators LC1 and LC2 is stronger than the magnetic coupling between LC parallel resonators LC1 and LC3.

[0069] The distance between via conductors V4 and V3 is shorter than the distance between via conductors V4 and V2. Therefore, the magnetic coupling between LC parallel resonators LC4 and LC3 is stronger than the magnetic coupling between LC parallel resonators LC4 and LC2. As a result, from the input / output terminal P1 side, LC parallel resonator LC1, LC parallel resonator LC2, LC parallel resonator LC3, and LC4 are coupled in this order, forming a four-stage LC filter.

[0070] The via conductors V2 and V3 are arranged on both sides of the dotted line VL1. The distance between the via conductors V1 and V2 is shorter than the distance between the via conductors V1 and V3. The distance between the via conductors V4 and V3 is shorter than the distance between the via conductors V4 and V2. In other words, the via conductors V1 to V4 are arranged in a staggered manner. As a result, Figure 1 The LC parallel resonators LC1 to LC4 are also arranged in a staggered pattern. This staggered arrangement enhances magnetic coupling between the LC parallel resonators compared to a linear arrangement. This facilitates signal transmission between the inductors and expands the passband of bandpass filter 1.

[0071] In bandpass filter 1, the capacitances of capacitors C12, C13, C24, and C34 can be independently adjusted by changing the shapes and arrangements of the planar electrodes 131 to 134. As a result, the characteristics of bandpass filter 1 can be brought close to desired characteristics with high accuracy.

[0072] Figure 4 Looking down from the X-axis Figure 2 FIG. 1 is a side view of the bandpass filter 1 SF1. Figure 4 As shown, the planar electrodes 131 to 134 are arranged on the dielectric layer Ly1 (first dielectric layer). By forming the planar electrodes 131 to 134 on the same dielectric layer, the bandpass filter 1 can be made thinner.

[0073] When manufacturing bandpass filter 1 using ceramic multilayer substrate technology, multiple layers of ceramic sheets having identical wiring conductor patterns and through-conductors formed in the planar direction are stacked and fired to form a stacked assembly. This stacked assembly is then divided in the planar direction to produce individual bandpass filters 1. To adjust the characteristics of bandpass filter 1 according to a particular communication system, a prototype stacked assembly is formed in which the shape and arrangement of the wiring conductor patterns corresponding to planar electrodes 131 to 134 are modified in the planar direction. This stacked assembly is then divided to produce multiple prototype bandpass filters 1 with different characteristics. By extracting a bandpass filter 1 that matches the desired characteristics from the prototype bandpass filters 1 and using the same planar electrode pattern as the pattern for mass production, the characteristics of bandpass filter 1 can be adjusted more efficiently.

[0074] Furthermore, planar electrodes 131 to 134 do not need to be formed on the same dielectric layer. For example, planar electrode 132 may be formed on a different dielectric layer from the dielectric layer forming planar electrodes 131 and 134. In this case, planar electrode 132 is arranged so that at least a portion of one side faces at least a portion of one side of planar electrodes 131 and 134 in the Z-axis direction. The same applies to planar electrode 133.

[0075] The capacitor electrodes 121 to 124 are arranged on the dielectric layer Ly2 (second dielectric layer). By forming the capacitor electrodes 121 to 124 on the same dielectric layer, the bandpass filter 1 can be made thinner.

[0076] Distance H1 is equal to the length of each of via conductors V1 to V4. Distance H2 is the distance from capacitor electrodes 121 to 124 to planar electrodes 131 to 134. The ratio of distance H2 to distance H1 is 0.05 to 0.95. By connecting planar electrode 131 to the center of via conductor V1 instead of near the end of via conductor V1, the impact of changes in the shape and configuration of planar electrode 131 on other circuit elements can be minimized. The same applies to planar electrodes 132 to 134.

[0077] [Variation 1 of Embodiment 1]

[0078] In Embodiment 1, each LC resonator includes a single planar electrode for adjusting the capacitive coupling between the two LC resonators. However, the LC resonator may include multiple planar electrodes. By including multiple planar electrodes in the LC resonator, the range of adjustable characteristics can be expanded.

[0079] Figure 5 This is an external perspective view of a bandpass filter 1A as an example of an LC filter according to a first modification of the first embodiment. Figure 6 Looking down from the X-axis Figure 5 The side view SF1 of the bandpass filter 1A is shown. The bandpass filter 1A is constructed to Figure 2 The bandpass filter 1 is provided with additional planar electrodes 131A to 134A. The remaining configuration is the same and therefore will not be described again.

[0080] like Figure 5 as well as Figure 6 As shown, the planar electrode 131A (first electrode) is connected to the via conductor V1 between both ends of the via conductor V1 . The planar electrode 131A is arranged between the planar electrode 131 and the capacitor electrode 121 and along the planar electrode 131 .

[0081] The planar electrode 132A (second electrode) is connected to the via conductor V2 between both ends of the via conductor V2 . The planar electrode 132A is disposed between the planar electrode 132 and the capacitor electrode 122 and along the planar electrode 132 .

[0082] The planar electrode 133A (fourth electrode) is connected to the via conductor V3 between both ends of the via conductor V3 . The planar electrode 133A is arranged between the planar electrode 133 and the capacitor electrode 123 and along the planar electrode 133 .

[0083] The planar electrode 134A (third electrode) is connected to the via conductor V4 between both ends of the via conductor V4 . The planar electrode 134A is arranged between the planar electrode 134 and the capacitor electrode 124 and along the planar electrode 134 .

[0084] The planar electrode 132A faces the planar electrode 131A in the Y-axis direction and faces the planar electrode 134A. The planar electrodes 131, 131A and 132, 132A form a capacitor C12. The planar electrodes 132, 132A and 134, 134A form a capacitor C24.

[0085] The planar electrode 133A faces the planar electrode 131A in the Y-axis direction and faces the planar electrode 134A. The planar electrodes 131, 131A and 133, 133A form a capacitor C13. The planar electrodes 133, 133A and 134, 134A form a capacitor C34.

[0086] [Variation 2 of Embodiment 1]

[0087] In the first embodiment, a configuration was described in which electrodes forming input and output terminals are arranged on the side surfaces (peripheral surfaces) of an LC filter formed as a laminate. The input and output terminals may also be formed on surfaces other than the periphery of the laminate. In a second variation of the first embodiment, a configuration is described in which the input and output terminals of a bandpass filter are formed as LGA (Land Grid Array) terminals regularly arranged on the bottom surface of the laminate.

[0088] Figure 7 This is a perspective view of the appearance of a bandpass filter 1B as an example of an LC filter according to a second modification of the first embodiment. Figure 8 Looking down from the Y axis Figure 7 The side view SF2 of the bandpass filter 1B is shown. The bandpass filter 1B is constructed by Figure 2The side electrodes 105 and 106, the ground electrode 111, and the capacitor electrodes 121 and 124 of the bandpass filter 1 are replaced with LGA terminals 105B and 106B, the ground electrode 111B, and the capacitor electrodes 121B and 124B, respectively, and via conductors V5 and V6 are added. Other than these, the configuration is the same and will not be repeated.

[0089] like Figure 7 as well as Figure 8 As shown, the LGA terminal 105B and the capacitor electrode 121B are connected by a via conductor V5, and the LGA terminal 106B and the capacitor electrode 124B are connected by a via conductor V6.

[0090] [Variation 3 of Embodiment 1]

[0091] In the first embodiment, a configuration in which one end of the inductor of the LC resonator included in the LC filter is open is described. In a third variation of the first embodiment, a configuration in which both ends of the inductor are open is described.

[0092] Figure 9 This is an equivalent circuit diagram of a bandpass filter 1C as an example of an LC filter according to a third modification of the first embodiment. Figure 9 The equivalent circuit diagrams shown are for Figure 1 The LC parallel resonators LC1 to LC4 in the equivalent circuit diagram shown have the addition of capacitors C10, C20, C30, and C40. Other than these, the components are the same and their description will not be repeated.

[0093] like Figure 9 As shown, capacitor C10 is connected between inductor L1 and ground. Capacitor C20 is connected between inductor L2 and ground. Capacitor C30 is connected between inductor L3 and ground. Capacitor C40 is connected between inductor L4 and ground.

[0094] Figure 10 yes Figure 9 A three-dimensional diagram of the appearance of the bandpass filter 1C. Figure 11 Looking down from the Y axis Figure 10 The side view of the bandpass filter 1C is shown in FIG. SF2. The bandpass filter 1C is configured to Figure 1 The configuration of the bandpass filter 1 is the same as that of the bandpass filter 1 except that capacitor electrodes 161 to 164 are added and via conductors V1 to V4 are replaced with V1C to V4C, respectively.

[0095] like Figure 10 as well as Figure 11As shown, the capacitor electrode 161 (fifth capacitor electrode) faces the ground electrode 141. The capacitor electrode 161 and the ground electrode 141 form a capacitor C10.

[0096] The via conductor V1C (first via conductor) forms the inductor L1. One end of the via conductor V1C is connected to the capacitor electrode 121. One end of the via conductor V1C is an open end that is DC-insulated from the ground electrode 111 by the capacitor electrode 121. The other end of the via conductor V1C is connected to the capacitor electrode 161. The other end of the via conductor V1C is an open end that is DC-insulated from the ground electrode 141 by the capacitor electrode 161. Since both ends of the via conductor V1C are open, Figure 9 The LC parallel resonator LC1 is a λ / 2 resonator, and the length of the via conductor V1C is substantially equal to λ / 2.

[0097] The capacitor electrode 162 (sixth capacitor electrode) faces the ground electrode 141. The capacitor electrode 162 and the ground electrode 141 form a capacitor C20.

[0098] The via conductor V2C (second via conductor) forms the inductor L2. One end of the via conductor V2C is connected to the capacitor electrode 122. One end of the via conductor V2C is an open end that is DC-insulated from the ground electrode 111 by the capacitor electrode 122. The other end of the via conductor V2C is connected to the capacitor electrode 162. The other end of the via conductor V2C is an open end that is DC-insulated from the ground electrode 141 by the capacitor electrode 162. Since both ends of the via conductor V2C are open, Figure 9 The LC parallel resonator LC2 is a λ / 2 resonator, and the length of the via conductor V2C is substantially equal to λ / 2.

[0099] The capacitor electrode 163 (eighth capacitor electrode) faces the ground electrode 141. The capacitor electrode 163 and the ground electrode 141 form a capacitor C30.

[0100] The via conductor V3C (fourth via conductor) forms the inductor L3. One end of the via conductor V3C is connected to the capacitor electrode 123. One end of the via conductor V3C is an open end that is DC-insulated from the ground electrode 111 via the capacitor electrode 123. The other end of the via conductor V3C is connected to the capacitor electrode 163. The other end of the via conductor V3C is an open end that is DC-insulated from the ground electrode 141 via the capacitor electrode 163. Since both ends of the via conductor V3C are open, Figure 9 The LC parallel resonator LC3 is a λ / 2 resonator. The length of the via conductor V3C is approximately equal to λ / 2.

[0101] The capacitor electrode 164 (seventh capacitor electrode) faces the ground electrode 141. The capacitor electrode 164 and the ground electrode 141 form a capacitor C40.

[0102] A via conductor V4C (third via conductor) forms inductor L4. One end of via conductor V4C is connected to capacitor electrode 124. One end of via conductor V4C is an open end, DC-insulated from ground electrode 111 by capacitor electrode 124. The other end of via conductor V4C is connected to capacitor electrode 164. The other end of via conductor V4C is an open end, DC-insulated from ground electrode 141 by capacitor electrode 164. Because both ends of via conductor V4C are open, LC parallel resonator LC4 is a λ / 2 resonator. The length of via conductor V4C is approximately equal to λ / 2.

[0103] As described above, according to the LC filters of the first embodiment and modifications 1 to 3, the adjustment accuracy of the characteristics of the LC filter can be improved.

[0104] In the first embodiment, the LC filter includes four LC resonators. However, the number of LC resonators included in the LC filter of the embodiment is not limited to four. The following describes a configuration including five LC resonators in the second embodiment, and a configuration including seven LC resonators in the third embodiment.

[0105] [Implementation Method 2]

[0106] Figure 12 FIG. 1 is an equivalent circuit diagram of a bandpass filter 2 as an example of an LC filter according to the second embodiment. Figure 12 In the equivalent circuit diagram shown in Figure 1 The equivalent circuit diagram shown in the figure adds an LC parallel resonator LC5 and capacitors C25 and C35. In other words, five stages of LC resonators are coupled in sequence to form a five-stage LC filter. Other than these, the description will not be repeated.

[0107] like Figure 12 As shown, the LC parallel resonator LC5 is arranged between the LC parallel resonators LC2 and LC3.

[0108] Capacitor C25 is connected between the LC parallel resonators LC2 and LC5. Capacitor C25 represents the capacitive coupling between the LC parallel resonators LC2 and LC5.

[0109] Capacitor C35 is connected between the LC parallel resonators LC3 and LC5. Capacitor C35 represents the capacitive coupling between the LC parallel resonators LC3 and LC5.

[0110] The LC parallel resonator LC5 includes an inductor L5 and a capacitor C5. The inductor L5 and the capacitor C5 are connected in parallel between the ground point and the connection point of the capacitors C25 and C35.

[0111] Figure 13 Looking down from the Z axis Figure 12 Figure 2 of the bandpass filter. Figure 13 In order to emphasize the characteristics of the bandpass filter 2, the structure is shown. Figure 12 The main electrodes of the LC parallel resonator LC1 to LC5. Figure 13 As shown, the bandpass filter 2 includes a ground electrode 211 , via conductors V21 to V25 , planar electrodes 231 to 235 , and capacitor electrodes 221 to 225 .

[0112] Capacitor electrodes 221 to 225 face ground electrode 211 in the Z-axis direction and form capacitors C1 to C5, respectively, together with ground electrode 211. Capacitor electrodes 222, 223, and 225 are arranged between capacitor electrodes 221 and 224 in the X-axis direction. Capacitor electrode 225 is arranged between capacitor electrodes 222 and 223 in the Y-axis direction.

[0113] One end of the via conductor V21 (first via conductor) is connected to the capacitor electrode 221 (first capacitor electrode). The via conductor V21 forms the inductor L1.

[0114] One end of the via conductor V22 (second via conductor) is connected to the capacitor electrode 222 (second capacitor electrode). The via conductor V22 forms the inductor L2.

[0115] One end of the via conductor V23 (fourth via conductor) is connected to the capacitor electrode 223 (fourth capacitor electrode). The via conductor V23 forms the inductor L3.

[0116] One end of the via conductor V24 (third via conductor) is connected to the capacitor electrode 224 (third capacitor electrode). The via conductor V24 forms the inductor L4.

[0117] One end of the via conductor V25 is connected to the capacitor electrode 225. The via conductor V25 forms an inductor L5.

[0118] The via conductors V22 and V23 are arranged on both sides of a dotted line VL2 connecting the via conductors V21 and V24. The via conductor V25 is arranged on the dotted line VL2.

[0119] For example, in Embodiment 2, it is assumed that magnetic coupling is superior to capacitive coupling. The distance between via conductors V21 and V22 is shorter than the distance between via conductors V21 and V25. Therefore, the magnetic coupling between LC parallel resonators LC1 and LC2 is stronger than the magnetic coupling between LC parallel resonators LC1 and LC5.

[0120] The distance between via conductors V24 and V23 is shorter than the distance between via conductors V24 and V25. Therefore, the magnetic coupling between LC parallel resonators LC4 and LC3 is stronger than the magnetic coupling between LC parallel resonators LC4 and LC5. As a result, from the input / output terminal P1 side, the LC parallel resonators LC1, LC2, LC5, LC3, and LC4 are coupled in this order, forming a five-stage LC filter.

[0121] The planar electrode 231 (first electrode) is connected to the via conductor V21 between its two ends. The planar electrode 232 (second electrode) is connected to the via conductor V22 between its two ends. The planar electrode 233 (fourth electrode) is connected to the via conductor V23 between its two ends. The planar electrode 234 (third electrode) is connected to the via conductor V24 between its two ends. The planar electrode 235 is connected to the via conductor V25 between its two ends.

[0122] The planar electrode 232 faces the planar electrodes 231, 234, and 235 in the Y-axis direction. The planar electrodes 231 and 232 form a capacitor C12. The planar electrodes 232 and 234 form a capacitor C24. The planar electrodes 232 and 235 form a capacitor C25.

[0123] The planar electrode 233 faces the planar electrodes 231, 234, and 235 in the Y-axis direction. The planar electrodes 231 and 233 form a capacitor C13. The planar electrodes 233 and 234 form a capacitor C34. The planar electrodes 233 and 235 form a capacitor C35.

[0124] As described above, according to the LC filter of the second embodiment, it is possible to improve the adjustment accuracy of the characteristics of the LC filter.

[0125] [Implementation Method 3]

[0126] Figure 14 : is an equivalent circuit diagram of a bandpass filter 3 as an example of an LC filter according to the third embodiment. Figure 14 In the equivalent circuit diagram shown in Figure 1The equivalent circuit diagram shown here adds LC parallel resonators LC5-LC7 and capacitors C45, C46, ​​C56, C57, and C67. In other words, seven LC resonators are coupled in sequence to form a seven-stage LC filter. Other than these, the circuit is identical and will not be described again.

[0127] like Figure 14 As shown, the LC parallel resonators LC5 and LC6 are arranged between the LC parallel resonators LC4 and LC7.

[0128] Capacitor C45 is connected between the LC parallel resonators LC4 and LC5. Capacitor C45 represents the capacitive coupling between the LC parallel resonators LC4 and LC5.

[0129] Capacitor C46 is connected between the LC parallel resonators LC4 and LC6. Capacitor C46 represents the capacitive coupling between the LC parallel resonators LC4 and LC6.

[0130] Capacitor C56 is connected between the LC parallel resonators LC5 and LC6. Capacitor C56 represents the capacitive coupling between the LC parallel resonators LC5 and LC6.

[0131] Capacitor C57 is connected between the LC parallel resonators LC5 and LC7. Capacitor C57 represents the capacitive coupling between the LC parallel resonators LC5 and LC7.

[0132] Capacitor C67 is connected between the LC parallel resonators LC6 and LC7. Capacitor C67 represents the capacitive coupling between the LC parallel resonators LC6 and LC7.

[0133] The LC parallel resonator LC5 includes an inductor L5 and a capacitor C5. The inductor L5 and the capacitor C5 are connected in parallel between the ground point and the connection point of the capacitors C45 and C56.

[0134] The LC parallel resonator LC6 includes an inductor L6 and a capacitor C6. The inductor L6 and the capacitor C6 are connected in parallel between the ground point and the connection point of the capacitors C56 and C67.

[0135] The LC parallel resonator LC7 includes an inductor L7 and a capacitor C7. The inductor L7 and the capacitor C7 are connected in parallel between the ground point and the connection point between the capacitor C67 and the input / output terminal P2.

[0136] Figure 15 Looking down from the Z axis Figure 14 Figure 3 of the bandpass filter. Figure 15 In order to emphasize the characteristics of the bandpass filter 3, the composition is shown. Figure 14 The main electrodes of the LC parallel resonator LC1 to LC7. Figure 15As shown, the bandpass filter 3 includes a ground electrode 311 (first ground electrode), via conductors V31 to V37 , planar electrodes 331 to 337 , and capacitor electrodes 321 to 327 .

[0137] Capacitor electrodes 321 to 327 are positioned opposite ground electrode 311 in the Z-axis direction and, together with ground electrode 311, form capacitors C1 to C7, respectively. Capacitor electrodes 322 and 323 are positioned between capacitor electrodes 321 and 324 in the X-axis direction. Capacitor electrodes 322 and 323 are positioned side by side in the Y-axis direction. Capacitor electrodes 325 and 326 are positioned between capacitor electrodes 324 and 327 in the X-axis direction. Capacitor electrodes 325 and 326 are positioned side by side in the Y-axis direction.

[0138] One end of the via conductor V31 (first via conductor) is connected to the capacitor electrode 321 (first capacitor electrode). The via conductor V31 forms the inductor L1.

[0139] One end of the via conductor V32 (second via conductor) is connected to the capacitor electrode 322 (second capacitor electrode). The via conductor V32 forms the inductor L2.

[0140] One end of the via conductor V33 (fourth via conductor) is connected to the capacitor electrode 323 (fourth capacitor electrode). The via conductor V33 forms the inductor L3.

[0141] One end of the via conductor V34 (third via conductor) is connected to the capacitor electrode 324 (third capacitor electrode). The via conductor V34 forms the inductor L4.

[0142] One end of the via conductor V35 is connected to the capacitor electrode 325. The via conductor V35 forms an inductor L5.

[0143] One end of the via conductor V36 is connected to the capacitor electrode 326. The via conductor V36 forms an inductor L6.

[0144] One end of the via conductor V37 is connected to the capacitor electrode 327. The via conductor V37 forms an inductor L7.

[0145] The via conductors V32 and V33 are arranged on both sides of a dotted line VL31 connecting the via conductors V31 and V34 . The via conductors V35 and V36 are arranged on both sides of a dotted line VL32 connecting the via conductors V34 and V37 .

[0146] For example, in Embodiment 3, it is assumed that magnetic coupling is superior to capacitive coupling. The distance between via conductors V31 and V32 is shorter than the distance between via conductors V31 and V33. Therefore, the magnetic coupling between LC parallel resonators LC1 and LC2 is stronger than the magnetic coupling between LC parallel resonators LC1 and LC3.

[0147] The distance between the via conductors V34 and V33 is shorter than the distance between the via conductors V34 and V32. Therefore, the magnetic coupling between the LC parallel resonators LC4 and LC3 is stronger than the magnetic coupling between the LC parallel resonators LC4 and LC2.

[0148] The distance between the via conductors V34 and V35 is shorter than the distance between the via conductors V34 and V36. Therefore, the magnetic coupling between the LC parallel resonators LC4 and LC5 is stronger than the magnetic coupling between the LC parallel resonators LC4 and LC6.

[0149] The distance between via conductors V37 and V36 is shorter than the distance between via conductors V37 and V35. Therefore, the magnetic coupling between LC parallel resonators LC7 and LC6 is stronger than the magnetic coupling between LC parallel resonators LC7 and LC5. As a result, from the input / output terminal P1 side, the LC parallel resonators LC1, LC2, LC3, LC4, LC5, LC6, and LC7 are coupled in this order, forming a seven-stage LC filter.

[0150] The planar electrode 331 (first electrode) is connected to the via conductor V31 between the two ends of the via conductor V31. The planar electrode 332 (second electrode) is connected to the via conductor V32 between the two ends of the via conductor V32. The planar electrode 333 (fourth electrode) is connected to the via conductor V33 between the two ends of the via conductor V33. The planar electrode 334 (third electrode) is connected to the via conductor V34 between the two ends of the via conductor V34. The planar electrode 335 is connected to the via conductor V35 between the two ends of the via conductor V35. The planar electrode 336 is connected to the via conductor V36 between the two ends of the via conductor V36. The planar electrode 337 is connected to the via conductor V37 between the two ends of the via conductor V37.

[0151] The planar electrode 332 faces the planar electrodes 331 and 334 in the Y-axis direction. The planar electrodes 331 and 332 form a capacitor C12. The planar electrodes 332 and 334 form a capacitor C24.

[0152] The planar electrode 333 faces the planar electrodes 331 and 334 in the Y-axis direction. The planar electrodes 331 and 333 form a capacitor C13. The planar electrodes 333 and 334 form a capacitor C34.

[0153] The capacitor electrode 322 faces the capacitor electrode 323 in the Y-axis direction. The capacitor electrodes 322 and 323 form a capacitor C23.

[0154] The planar electrode 335 faces the planar electrodes 334 and 337 in the Y-axis direction. The planar electrodes 334 and 335 form a capacitor C45. The planar electrodes 335 and 337 form a capacitor C57.

[0155] The planar electrode 336 faces the planar electrodes 334 and 337 in the Y-axis direction. The planar electrodes 334 and 336 form a capacitor C46. The planar electrodes 336 and 337 form a capacitor C67.

[0156] The capacitor electrode 325 faces the capacitor electrode 326 in the Y-axis direction. The capacitor electrodes 325 and 326 form a capacitor C56.

[0157] As described above, according to the LC filter of the third embodiment, it is possible to improve the adjustment accuracy of the characteristics of the LC filter.

[0158] [Implementation Method 4]

[0159] In the first embodiment, a configuration in which a plurality of LC resonators included in an LC filter are arranged in a staggered manner is described. In the fourth embodiment, a configuration in which the plurality of LC resonators are arranged in a straight line is described.

[0160] Figure 16 This is a diagram showing a bandpass filter 4 as an example of an LC filter according to a fourth embodiment, viewed from the Z-axis direction. The equivalent circuit diagram of the bandpass filter 4 is similar to the Figure 1 Same. Figure 16 In order to emphasize the characteristics of the bandpass filter 4, the composition is shown. Figure 1 The main electrodes of the LC parallel resonators LC1 to LC4.

[0161] like Figure 16 As shown, the bandpass filter 4 includes a ground electrode 411 , via conductors V41 to V44 , planar electrodes 431 to 434 , and capacitor electrodes 421 to 424 .

[0162] Capacitor electrodes 421-424 face ground electrode 411 in the Z-axis direction and form capacitors C1-C4 together with ground electrode 411. Capacitor electrodes 422 and 423 are arranged between capacitor electrodes 421 and 424 in the X-axis direction. Capacitor electrodes 421-424 are arranged side by side on a straight line in the X-axis direction.

[0163] One end of the via conductor V41 (first via conductor) is connected to the capacitor electrode 421 (first capacitor electrode). The via conductor V41 forms the inductor L1.

[0164] One end of the via conductor V42 (second via conductor) is connected to the capacitor electrode 422 (second capacitor electrode). The via conductor V42 forms the inductor L2.

[0165] One end of the via conductor V43 (fourth via conductor) is connected to the capacitor electrode 423 (fourth capacitor electrode). The via conductor V43 forms the inductor L3.

[0166] One end of the via conductor V44 (third via conductor) is connected to the capacitor electrode 424 (third capacitor electrode). The via conductor V44 forms the inductor L4.

[0167] The via conductors V42 and V43 are arranged on both sides of a dotted line VL4 connecting the via conductors V41 and V44 .

[0168] The distance between the via conductors V41 and V42 is shorter than the distance between the via conductors V41 and V43. Therefore, the magnetic coupling between the via conductors V41 and V42 is stronger than the magnetic coupling between the via conductors V41 and V43.

[0169] The distance between the via conductors V44 and V43 is shorter than the distance between the via conductors V44 and V42. Therefore, the magnetic coupling between the via conductors V44 and V43 is stronger than the magnetic coupling between the via conductors V44 and V42.

[0170] The planar electrode 431 (first electrode) is connected to the via conductor V41 between its two ends. The planar electrode 432 (second electrode) is connected to the via conductor V42 between its two ends. The planar electrode 433 (fourth electrode) is connected to the via conductor V43 between its two ends. The planar electrode 434 (third electrode) is connected to the via conductor V44 between its two ends.

[0171] The planar electrode 432 faces the planar electrodes 431 and 434 in the Y-axis direction. The planar electrodes 431 and 432 form a capacitor C12. The planar electrodes 432 and 434 form a capacitor C24.

[0172] The planar electrode 433 faces the planar electrodes 431 and 434 in the Y-axis direction. The planar electrodes 431 and 433 form a capacitor C13. The planar electrodes 433 and 434 form a capacitor C34.

[0173] The capacitor electrode 422 faces the capacitor electrode 423 in the X-axis direction. The capacitor electrodes 422 and 423 form a capacitor C23.

[0174] As described above, according to the LC filter of the fourth embodiment, it is possible to improve the adjustment accuracy of the characteristics of the LC filter.

[0175] [Implementation 5]

[0176] In the fifth embodiment, an LC filter will be described that further includes an adjustment electrode portion that interconnects at least two of the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor.

[0177] Figure 17 1 is a perspective view of the appearance of a bandpass filter 5 as an example of an LC filter according to the fifth embodiment. Figure 18 Looking down from the X-axis Figure 17 The bandpass filter 5 is a diagram of the bandpass filter 5. The bandpass filter 5 is composed of Figure 2 The bandpass filter 1 of FIG. 1 is additionally configured with an adjustment electrode 540 (adjustment electrode portion). Other configurations are the same, so descriptions thereof will not be repeated. Figure 17 、 Figure 18 As shown, the adjustment electrode 540 connects the via conductors V1 to V4 to each other.

[0178] Figure 19 It is shown together Figure 17 The pass characteristics of the bandpass filter 5 (solid line) and Figure 2 The pass characteristic (dashed line) of the bandpass filter 1 is shown in FIG. Figure 19 As shown, the passband PB5 of the bandpass filter 5 (a band where the attenuation is below the reference attenuation d0 (eg, 3 dB)) is wider than the passband PB1 of the bandpass filter 1. By adjusting the electrode 540, the bandpass filter 5 is widened.

[0179] Figure 20 It is shown together Figure 17 The reflection characteristics of the bandpass filter 5 (solid line) and Figure 2 The reflection characteristics (dashed line) of the bandpass filter 1 are shown in FIG. Figure 20 As shown, the maximum value d5 of the reflection loss in the passband of the bandpass filter 5 is larger than the maximum value d1 of the reflection loss in the passband of the bandpass filter 1. By adjusting the electrode 540, the reflection characteristics of the bandpass filter 5 can be improved.

[0180] Figure 21 It means to make Figure 18 The figure shows the change of the pass characteristic of the bandpass filter 5 when the distance H5 between the dielectric layer Ly1 and the adjustment electrode 540 changes. The distance H5 becomes shorter in the order of the curves IL1, IL2, and IL3. Figure 21 As shown, the shorter the distance H5 is, the wider the passband of the bandpass filter 5 can be.

[0181] In Embodiment 5, the adjustment electrode portion is formed by the adjustment electrode 540 and the adjustment electrode connects the via conductors V1 to V4 to each other. However, the adjustment electrode portion may include a plurality of electrodes. Figure 22 This is a diagram showing an electrode structure of a bandpass filter 5A according to a first modification of the fifth embodiment. Figure 23 Looking down from the Y axis Figure 22 The electrode structure of the bandpass filter 5A is shown in FIG. The bandpass filter 5A is constructed by Figure 17 The configuration is such that the adjustment electrode 540 is replaced with the adjustment electrode portion 540A. Other configurations are the same, so description thereof will not be repeated.

[0182] like Figure 22 、 Figure 23 As shown, adjustment electrode section 540A includes adjustment electrode 541 (first adjustment electrode), adjustment electrode 542 (second adjustment electrode), adjustment electrode 543 (third adjustment electrode), and adjustment electrode 544 (fourth adjustment electrode). Adjustment electrode 541 connects via conductors V1 and V2. Adjustment electrode 542 connects via conductors V1 and V4. Adjustment electrode 543 connects via conductors V2 and V3. Adjustment electrode 544 connects via conductors V4 and V3.

[0183] The adjustment electrode portion may have any electrode structure as long as it connects at least two of the via conductors V1 to V4 to each other. Figures 24 to 27 , for use Figure 22 A part of the plurality of electrodes included in the adjustment electrode portion 540A shown will be described as a modified example of the adjustment electrode portion.

[0184] Figure 24 FIG. 5 is a diagram showing an electrode structure of a bandpass filter 5B according to a second modification of the fifth embodiment. The bandpass filter 5B is constructed by Figure 22 The configuration of the adjustment electrode portion 540A is replaced by the adjustment electrode portion 540B. The configuration of the adjustment electrode portion 540B is the configuration obtained by removing the adjustment electrode 543 from the adjustment electrode portion 540A. Other than these, the configuration is the same and therefore will not be described again.

[0185] Figure 25 FIG. 5 is a diagram showing an electrode structure of a bandpass filter 5C according to a third variation of the fifth embodiment. The bandpass filter 5C is configured by Figure 22 The configuration is obtained by replacing the adjustment electrode unit 540A with the adjustment electrode unit 540C. The configuration of the adjustment electrode unit 540C is obtained by removing the adjustment electrodes 542 and 543 from the adjustment electrode unit 540A. The configuration is otherwise the same, so the description will not be repeated.

[0186] Figure 26FIG. 5 is a diagram showing an electrode structure of a bandpass filter 5D according to a fourth variation of the fifth embodiment. The bandpass filter 5D is constructed by Figure 22 The configuration is such that the adjustment electrode portion 540A is replaced with the adjustment electrode 542 (adjustment electrode portion). Other configurations are the same, so description thereof will not be repeated.

[0187] Figure 27 FIG. 5 is a diagram showing an electrode structure of a bandpass filter 5E according to a fifth modification of the fifth embodiment. The bandpass filter 5E is constructed by Figure 22 The configuration is such that the adjustment electrode portion 540A is replaced with the adjustment electrode 541 (adjustment electrode portion). Other configurations are the same, so description thereof will not be repeated.

[0188] As described above, according to the LC filters of the fifth embodiment and modifications 1 to 5, the adjustment accuracy of the characteristics of the LC filter can be improved.

[0189] The various embodiments disclosed herein are intended to be combined and implemented as appropriate within the scope of non-inconsistency. The embodiments disclosed herein should be considered illustrative in all respects and not restrictive. The scope of the present invention is not defined by the above description but by the technical solutions, and includes all modifications within the meaning and scope of the technical solutions.

[0190] Description of Reference Numerals

[0191] 1-5, 1A-1C, 5A-5E...bandpass filter, 101, 102, 151, 152...ground terminal, 103-106...side electrode, 105B, 106B...LGA terminal, 111, 111B, 141, 211, 311, 411...ground electrode, 121-124, 121B, 124B, 161-164, 221-225, 321-327, 421-424...capacitor electrode, 131-134, 131A-134A, 231-235, 331-337, 431-434...flat Surface electrodes, 540-544…adjustment electrodes, 540A-540C…adjustment electrode portion, C1-C7, C10, C12, C13, C20, C23-C25, C30, C34, C35, C40, C45, C46, ​​C56, C57, C67…capacitors, L1-L7…inductors, LC1-LC7…LC parallel resonators, Ly1, Ly2…dielectric layers, P1, P2…input / output terminals, V1C, V1-V6, V1C-V4C, V21-V25, V31-V37, V41-V44…through conductors.

Claims

1. An LC filter comprising a plurality of dielectric layers stacked in a stacking direction, comprising: a first LC resonator; a second LC resonator; a third LC resonator; and The fourth LC resonator, The first LC resonator comprises: A first via conductor extending in the stacking direction; and at least one first electrode connected to the first conducting conductor between both ends of the first conducting conductor; The second LC resonator includes: A second via conductor extending in the stacking direction; and at least one second electrode connected to the second conducting conductor between both ends of the second conducting conductor; The third LC resonator includes: A third via conductor extending in the stacking direction; and at least one third electrode connected to the third conducting conductor between both ends of the third conducting conductor; The fourth LC resonator includes a fourth via conductor extending in the stacking direction. When viewed from above in the stacking direction, the second via conductor and the fourth via conductor are respectively arranged on both sides of a virtual line connecting the first via conductor and the third via conductor. The at least one second electrode is opposite to the at least one first electrode and is opposite to the at least one third electrode. The second via conductor and the fourth via conductor each define an inductor located at a distance away from the dotted line in a plan view.

2. The LC filter according to claim 1, wherein The fourth LC resonator further includes at least one fourth electrode connected to the fourth via conductor between both ends of the fourth via conductor. The at least one fourth electrode is opposite to the at least one first electrode and is opposite to the at least one third electrode.

3. The LC filter according to claim 2, wherein The plurality of dielectric layers include a first dielectric layer on which the at least one first electrode, the at least one second electrode, the at least one third electrode, and the at least one fourth electrode are arranged.

4. The LC filter according to claim 2 or 3, wherein: further comprising a first ground electrode, The first LC resonator further includes a first capacitor electrode connected to one end of the first via conductor and facing the first ground electrode in the stacking direction. The second LC resonator further includes a second capacitor electrode connected to one end of the second via conductor and facing the first ground electrode in the stacking direction. The third LC resonator further includes a third capacitor electrode connected to one end of the third via conductor and facing the first ground electrode in the stacking direction. The fourth LC resonator further includes a fourth capacitor electrode connected to one end of the fourth via conductor and facing the first ground electrode in the stacking direction.

5. The LC filter according to claim 4, wherein The plurality of dielectric layers include a second dielectric layer on which the first capacitor electrode, the second capacitor electrode, the third capacitor electrode, and the fourth capacitor electrode are arranged.

6. The LC filter according to claim 4, wherein A second ground electrode is further provided, the second ground electrode being connected to the other end of the first via conductor, the other end of the second via conductor, the other end of the third via conductor, and the other end of the fourth via conductor.

7. The LC filter according to claim 5, wherein A second ground electrode is further provided, the second ground electrode being connected to the other end of the first via conductor, the other end of the second via conductor, the other end of the third via conductor, and the other end of the fourth via conductor.

8. The LC filter according to claim 4, wherein further comprising a second ground electrode, The first LC resonator further includes a fifth capacitor electrode connected to the other end of the first via conductor and facing the second ground electrode in the stacking direction. The second LC resonator further includes a sixth capacitor electrode connected to the other end of the second via conductor and facing the second ground electrode in the stacking direction. The third LC resonator further includes a seventh capacitor electrode connected to the other end of the third via conductor and facing the second ground electrode in the stacking direction. The fourth LC resonator further includes an eighth capacitor electrode connected to the other end of the fourth via conductor and facing the second ground electrode in the stacking direction.

9. The LC filter according to claim 5, wherein further comprising a second ground electrode, The first LC resonator further includes a fifth capacitor electrode connected to the other end of the first via conductor and facing the second ground electrode in the stacking direction. The second LC resonator further includes a sixth capacitor electrode connected to the other end of the second via conductor and facing the second ground electrode in the stacking direction. The third LC resonator further includes a seventh capacitor electrode connected to the other end of the third via conductor and facing the second ground electrode in the stacking direction. The fourth LC resonator further includes an eighth capacitor electrode connected to the other end of the fourth via conductor and facing the second ground electrode in the stacking direction.

10. The LC filter according to claim 2 or 3, wherein: The number of the at least one first electrode, the at least one second electrode, the at least one third electrode, and the at least one fourth electrode is plural.

11. The LC filter according to any one of claims 1 to 3, wherein A ratio of a distance from one end of the first via conductor to the at least one first electrode to a length of the first via conductor is not less than 0.05 and not more than 0.

95.

12. The LC filter according to any one of claims 1 to 3, wherein The device further includes an adjustment electrode portion that connects at least two of the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor to each other.

13. The LC filter according to claim 12, wherein The adjustment electrode portion includes an adjustment electrode that connects the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor to one another.

14. The LC filter according to claim 12, wherein The adjustment electrode section includes: a first adjustment electrode connecting the first conductive conductor and the second conductive conductor; a second adjustment electrode connecting the first conductive conductor and the third conductive conductor; a third adjustment electrode connecting the second via conductor and the fourth via conductor; and The fourth adjustment electrode connects the third via conductor and the fourth via conductor.

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