Resonator elements, filters and modules

Abstract

The present invention improves the insertion loss of a resonant element. In the resonant element (10), a first via electrode (111) and a second via electrode (112) connect a first planar electrode (101) and a third planar electrode (103). A third via electrode (113) and a fourth via electrode (114) connect the first planar electrode (101) and a second planar electrode (102). When the first planar electrode (101) is viewed from the normal direction (Z) of the first planar electrode (101), a first imaginary line (VL11) connecting the first via electrode (111) and the second via electrode (112) and a second imaginary line (VL12) connecting the third via electrode (113) and the fourth via electrode (114) cross.

Description

TECHNICAL FIELD

[0001] The present application relates to a resonant element, a filter including the resonant element, and a module including the filter. BACKGROUND

[0002] In the past, a resonant element has been known. For example, a resonant element in which a plurality of via electrodes are formed inside a dielectric is disclosed in International Publication No. 2020 / 105257 (Patent Literature 1). Since the plurality of via electrodes form an inductor, the proportion of the dielectric in the resonant element increases. As a result, it is possible to improve the strength of the resonant element.

[0003] Patent Literature 1: International Publication No. 2020 / 105257

[0004] In the resonant element disclosed in Patent Literature 1, since one of the two planar electrodes forming a capacitor is connected to one of the via electrodes, the current flowing in the capacitor is concentrated in the via electrode. As a result, the insertion loss of the resonant element can deteriorate. SUMMARY

[0005] The present application has been made to solve the above-described problems, and aims to improve the insertion loss of a resonant element.

[0006] The resonant element of the present application includes a laminate, a first planar electrode, a second planar electrode, a third planar electrode, a first via electrode, a second via electrode, a third via electrode, and a fourth via electrode. The first planar electrode, the second planar electrode, and the third planar electrode are disposed in the laminate. The third planar electrode is disposed between the first planar electrode and the second planar electrode in the normal direction of the first planar electrode. The first via electrode and the second via electrode connect the first planar electrode and the third planar electrode. The third via electrode and the fourth via electrode connect the first planar electrode and the second planar electrode. When the first planar electrode is viewed from the normal direction of the first planar electrode, a first imaginary line and a second imaginary line intersect, wherein the first imaginary line is an imaginary line connecting the first via electrode and the second via electrode, and the second imaginary line is an imaginary line connecting the third via electrode and the fourth via electrode.

[0007] According to the resonant element of the present application, by the first imaginary line connecting the first via electrode and the second via electrode and the second imaginary line connecting the third via electrode and the fourth via electrode intersecting when the first planar electrode is viewed from the normal direction of the first planar electrode, it is possible to improve the insertion loss of the resonant element. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is an equivalent circuit diagram of a duplexer as one example of the filter of Embodiment 1.

[0009] Figure 2 is Figure 1 a perspective view of a duplexer.

[0010] Figure 3 is a perspective view of a plurality of electrodes formed inside a laminate of Figure 2 .

[0011] Figure 4 is a perspective view of a plurality of electrodes forming a resonant element of Figure 3 .

[0012] Figure 5 is a view of the resonant element of Figure 4 from the X-axis direction.

[0013] Figure 6 is a view of the resonant element of Figure 4 from the Z-axis direction.

[0014] Figure 7 is a perspective view of a plurality of electrodes forming an inductor and a capacitor of Figure 3 .

[0015] Figure 8 is a perspective view of a plurality of electrodes forming a resonant element of a comparative example.

[0016] Figure 9 is a perspective view of a plurality of electrodes forming a resonant element of Embodiment 2.

[0017] Figure 10 is a view of the resonant element of Figure 9 from the Z-axis direction.

[0018] Figure 11 is a perspective view of a plurality of electrodes forming a resonant element of Embodiment 3.

[0019] Figure 12 is a view of the resonant element of Figure 11 from the Z-axis direction. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments will be explained in detail with reference to the drawings. Furthermore, the same or equivalent portions in the drawings are denoted by the same reference numerals, and their explanations will not be repeated.

[0021] [Embodiment 1]

[0022] Figure 1 is an equivalent circuit diagram of a duplexer 1 as one example of a filter of Embodiment 1. As Figure 1As shown, the duplexer 1 includes: a common terminal Pcom, terminals P1 and P2, inductors L1 and L2, capacitors C1 and C2, and resonant elements 10 and 20. The resonant frequency of resonant element 20 is different from that of resonant element 10.

[0023] The resonant element 10 includes terminals P11 and P12, an inductor L11, and a capacitor C11. The inductor L11 and the capacitor C11 are connected in parallel between terminals P11 and P12. The resonant element 10 forms an LC parallel resonant circuit.

[0024] Inductor L1 is connected between the common terminal Pcom and terminal P11. Capacitor C1 is connected between terminal P11 and ground terminal G1, which serves as the grounding point. Terminals P1 and P12 are connected.

[0025] The resonant element 20 includes terminals P21 and P22, an inductor L21, and a capacitor C21. The inductor L21 and the capacitor C21 are connected in parallel between terminals P21 and P22. The resonant element 20 forms an LC parallel resonant circuit.

[0026] Capacitor C2 is connected between the common terminal Pcom and terminal P21. Inductor L2 is connected between terminal P21 and ground terminal G2, which serves as the grounding point. Terminals P2 and P22 are connected.

[0027] Figure 2 yes Figure 1 A perspective view of the duplexer 1. Figure 2 The X, Y, and Z axes shown are orthogonal to each other. Figures 3-12 The same applies in the laminate 100. In the laminate 100, multiple dielectric layers are stacked in the Z-axis direction. Multiple electrodes are formed inside the laminate 100, and these multiple electrodes form... Figure 1 The equivalent circuit shown is as follows. That is, the duplexer 1 is contained in the module, and multiple electrodes are formed in the multiple dielectric layers stacked in the module.

[0028] like Figure 2 As shown, a direction identification mark DM is formed on the upper surface UF of the duplexer 1. Common terminals Pcom, terminals P1, P2, and P3, and ground terminals G1 and G2 are formed on the bottom surface BF of the duplexer 1. The common terminals Pcom, terminals P1 to P3, and ground terminals G1 and G2 are, for example, LGA (Land Grid Array) terminals with planar electrodes regularly arranged on the bottom surface BF. The bottom surface BF of the duplexer 1 is connected to a circuit board (not shown).

[0029] Figure 3 It is formed in Figure 2A perspective view of the plurality of electrodes inside the stack 100. Hereinafter, for easy observation of the electrode structure formed by the plurality of electrodes, the plurality of electrodes shown in FIG. 1 is divided into a plurality of electrodes forming the resonant elements 10, 20 and a plurality of electrodes forming the inductors L1, L2 and the capacitors C1, C2 and described. Figure 3 The plurality of electrodes shown in FIG. 1 is divided into a plurality of electrodes forming the resonant elements 10, 20 and a plurality of electrodes forming the inductors L1, L2 and the capacitors C1, C2 and described.

[0030] Figure 4 is a perspective view of the plurality of electrodes forming the resonant elements 10, 20. Figure 3 is a perspective view of the plurality of electrodes forming the resonant elements 10, 20. Figure 5 is a plan view of the resonant elements 10, 20 from the X-axis direction. Figure 4 is a plan view of the resonant elements 10, 20 from the Y-axis direction. Figure 6 is a plan view of the resonant elements 10, 20 from the Z-axis direction. Figure 4 is a plan view of the resonant elements 10, 20 from the Z-axis direction.

[0031] As shown in FIG. 1, the resonant element 10 includes a planar electrode 101 (first planar electrode), a planar electrode 102 (second planar electrode), a planar electrode 103 (third planar electrode), a via electrode 111 (first via electrode), a via electrode 112 (second via electrode), a via electrode 113 (third via electrode), and a via electrode 114 (fourth via electrode). Figures 4-6

[0032] The planar electrode 103 is disposed between the planar electrode 101 and the planar electrode 102 in the normal direction (Z-axis direction) of the planar electrode 101. The via electrodes 111, 112 extend in the Z-axis direction and connect the planar electrodes 101 and 103. The via electrodes 113, 114 extend in the Z-axis direction and connect the planar electrodes 101 and 102.

[0033] The planar electrode 103 is connected to the via electrode 303. A terminal P11 is formed at the connection portion of the planar electrode 103 and the via electrode 303. The via electrode 301 connects the planar electrode 102 and the terminal P1. A terminal P12 is formed at the connection portion of the planar electrode 102 and the via electrode 301.

[0034] The via electrodes 111, 112 are each shorter than each of the via electrodes 113, 114. The distance between the planar electrode 103 and the planar electrode 102 is shorter than the distance between the planar electrode 103 and the planar electrode 101.

[0035] The via electrodes 111 to 114 form an inductor L11. The planar electrode 102 and the planar electrode 103 face each other in the Z-axis direction and form a capacitor C11.

[0036] ​The resonant element 20 includes: a planar electrode 201 (first planar electrode), a planar electrode 202 (second planar electrode), a planar electrode 203 (third planar electrode), a through-hole electrode 211 (first through-hole electrode), a through-hole electrode 212 (second through-hole electrode), a through-hole electrode 213 (third through-hole electrode), and a through-hole electrode 214 (fourth through-hole electrode).

[0037] Planar electrode 203 is disposed between planar electrode 201 and planar electrode 202 in the normal direction of planar electrode 201. Through-hole electrodes 211 and 212 extend in the Z-axis direction and connect planar electrode 201 and planar electrode 203. Through-hole electrodes 213 and 214 extend in the Z-axis direction and connect planar electrode 201 and planar electrode 202.

[0038] Planar electrode 203 is connected to through-hole electrode 304. Terminal P21 is formed at the connection between planar electrode 203 and through-hole electrode 304. Through-hole electrode 302 connects planar electrode 202 and terminal P2. Terminal P22 is formed at the connection between planar electrode 202 and through-hole electrode 302.

[0039] Through-hole electrodes 211 and 212 are shorter than each of the through-hole electrodes 213 and 214, respectively. The distance between planar electrode 203 and planar electrode 202 is shorter than the distance between planar electrode 203 and planar electrode 201.

[0040] Through-hole electrodes 211-214 form an inductor L21. Planar electrodes 202 and 203 are opposite to each other in the Z-axis direction and form a capacitor C21.

[0041] like Figure 6 As shown, when the planar electrode 101 is viewed from above along the Z-axis, the through-hole electrode 111, the region Rg11 between through-hole electrode 111 and through-hole electrode 113, the region Rg12 between through-hole electrode 113 and through-hole electrode 112, the region Rg13 between through-hole electrode 112 and through-hole electrode 114, the region Rg14 between through-hole electrode 114 and through-hole electrode 111 form an annular region. Within this annular region, through-hole electrodes 111 and 112 connecting planar electrode 101 and planar electrode 103, and through-hole electrodes 113 and 114 connecting planar electrode 101 and planar electrode 102, are alternately arranged. The imaginary line VL11 (first imaginary line) connecting the through-hole electrode 111 and the through-hole electrode 112 intersects with the imaginary line VL12 (second imaginary line) connecting the through-hole electrode 113 and the through-hole electrode 114.

[0042] The direction of the current flowing in through-hole electrode 111 is the same as the direction of the current flowing in through-hole electrode 112. The direction of the current flowing in through-hole electrode 113 is the same as the direction of the current flowing in through-hole electrode 114. The direction of the current flowing in through-hole electrode 111 is opposite to the direction of the current flowing in through-hole electrode 113.

[0043] A portion of planar electrode 103 does not overlap with planar electrodes 101 and 102. Terminal P11 is formed on the portion of planar electrode 103 that does not overlap with planar electrodes 101 and 102.

[0044] When the planar electrode 201 is viewed from above along the Z-axis, the following regions form annular regions: through-hole electrode 211, region Rg15 between through-hole electrode 211 and through-hole electrode 213, region Rg16 between through-hole electrode 213 and through-hole electrode 212, region Rg17 between through-hole electrode 212 and through-hole electrode 214, and region Rg18 between through-hole electrode 214 and through-hole electrode 211. Within this annular region, through-hole electrodes 211 and 212 connecting planar electrode 201 and planar electrode 203, and through-hole electrodes 213 and 214 connecting planar electrode 201 and planar electrode 202, are alternately arranged. The imaginary line VL13 (first imaginary line) connecting through-hole electrode 211 and through-hole electrode 212 intersects with the imaginary line VL14 (second imaginary line) connecting through-hole electrode 213 and through-hole electrode 214.

[0045] The direction of the current flowing in through-hole electrode 211 is the same as the direction of the current flowing in through-hole electrode 212. The direction of the current flowing in through-hole electrode 213 is the same as the direction of the current flowing in through-hole electrode 214. The direction of the current flowing in through-hole electrode 211 is opposite to the direction of the current flowing in through-hole electrode 213.

[0046] A portion of planar electrode 203 does not overlap with planar electrodes 201 and 202. Terminal P21 is formed on the portion of planar electrode 203 that does not overlap with planar electrodes 201 and 202.

[0047] Figure 7 It is formed Figure 3 A three-dimensional diagram of the multiple electrodes of inductors L1 and L2 and capacitors C1 and C2. (See diagram below.) Figure 7 As shown, planar electrode 161 is connected to ground terminal G1 through through-hole electrodes 305 and 306. Planar electrode 162 is opposite to planar electrode 161 in the Z-axis direction. Planar electrodes 161 and 162 form capacitor C1.

[0048] The line electrode 163 is connected to the planar electrode 162 through the via electrode 303. The line electrode 163 is connected to the line electrode 164 through the via electrode 308. The line electrode 164 is connected to the planar electrode 165 through the via electrode 307. The line electrode 163 and the line electrode 164 form an inductor L1.

[0049] The planar electrode 165 is connected to the common terminal Pcom through the via electrode 309. The planar electrode 165 is connected to the planar electrode 166 through the via electrode 310. The planar electrode 166 is opposed to the planar electrode 167 in the Z-axis direction. The planar electrode 166 and the planar electrode 167 form a capacitor C2.

[0050] The line electrode 168 is connected to the planar electrode 130 through the via electrode 313. The line electrode 168 is connected to the line electrode 169 through the via electrode 312. The line electrode 169 is connected to the planar electrode 167 through the via electrode 311. The line electrode 168 and the line electrode 169 form an inductor L2. The planar electrode 170 is connected to the ground terminal G2 through the via electrode 314 and the via electrode 315.

[0051] Figure 8 is a perspective view of a plurality of electrodes of a resonant element 9 of a comparative example. As shown in Figure 8 The resonant element 9 includes planar electrodes 901, 902, 903 and via electrodes 911, 912, 913, 914, 915.

[0052] The planar electrode 903 is disposed between the planar electrode 901 and the planar electrode 902 in the normal direction of the planar electrode 901. The via electrode 911 extends in the Z-axis direction and connects the planar electrode 901 and the planar electrode 903. The via electrodes 912 to 915 extend in the Z-axis direction and connect the planar electrode 901 and the planar electrode 902. The via electrodes 912 and 913 are disposed along the Y-axis direction. The via electrodes 913 and 914 are disposed along the X-axis direction. The via electrodes 914 and 915 are disposed along the Y-axis direction. The via electrodes 915 and 912 are disposed along the X-axis direction.

[0053] The via electrode 911 is shorter than each of the via electrodes 912 to 915. The planar electrode 903 is closer to the planar electrode 902 than to the planar electrode 901.

[0054] The via electrodes 911 to 915 form an inductor. The planar electrode 902 and the planar electrode 903 are opposed to each other in the Z-axis direction and form a capacitor.

[0055] The planar electrode 903 has a portion disposed between the via electrode 912 and the via electrode 913. The terminal P91 is formed in the portion. The terminal P92 is formed in the planar electrode 902.

[0056] In the resonant element 9, since the planar electrode 901 and the planar electrode 903 are connected by the via electrode 911, a current flowing in a capacitor formed by the planar electrode 901 and the planar electrode 903 is concentrated in the via electrode 911. As a result, the insertion loss of the resonant element 9 can be deteriorated.

[0057] Therefore, in the resonant element of the embodiment, when the first planar electrode is viewed from the direction of the normal line of the first planar electrode, a plurality of via electrodes connecting the first planar electrode and the third planar electrode and a plurality of via electrodes connecting the first planar electrode and the second planar electrode are alternately disposed in the annular region so that the first imaginary line and the second imaginary line cross. Since the first planar electrode and the third planar electrode are connected by the plurality of via electrodes, a current flowing in a capacitor formed by the second planar electrode and the third planar electrode is dispersed into the plurality of via electrodes connecting the first planar electrode and the third planar electrode. As a result, the insertion loss of the resonant element can be improved compared with the insertion loss of the resonant element of the comparative example.

[0058] In addition, since the directions of the currents flowing in the plurality of via electrodes connecting the first planar electrode and the third planar electrode and the directions of the currents flowing in the plurality of via electrodes connecting the first planar electrode and the second planar electrode are opposite to each other, the directions of the magnetic fields generated from two via electrodes adjacent to each other in the annular region are also opposite to each other. Since independent magnetic fields are generated from the plurality of via electrodes disposed in the annular region, the coupling of the resonant element and other circuit elements can be suppressed.

[0059] In the above, according to the resonant element of the embodiment 1, the insertion loss of the resonant element can be improved.

[0060] [Embodiment 2]

[0061] In the embodiment 2, a structure in which the width of the third planar electrode is widened, the manufacturing variation of the characteristics of the resonant element is reduced, and the risk of short-circuiting of the first planar electrode and the second planar electrode is reduced is described.

[0062] Figure 9 is a perspective view of a plurality of electrodes forming the resonant element 12 of the embodiment 2. As Figure 9As shown, the resonant element 12 includes: a planar electrode 121 (first planar electrode), a planar electrode 122 (second planar electrode), a planar electrode 123 (third planar electrode), a through-hole electrode 131 (first through-hole electrode), a through-hole electrode 132 (second through-hole electrode), a through-hole electrode 133 (third through-hole electrode), and a through-hole electrode 134 (fourth through-hole electrode).

[0063] Planar electrode 123 is disposed between planar electrode 121 and planar electrode 122 in the normal direction (Z-axis direction) of planar electrode 121. Through-hole electrodes 131 and 132 extend in the Z-axis direction and connect planar electrode 121 and planar electrode 123. Through-hole electrodes 133 and 134 extend in the Z-axis direction and connect planar electrode 121 and planar electrode 122.

[0064] Through-hole electrodes 131 and 132 are shorter than each of through-hole electrodes 133 and 134, respectively. The distance between planar electrode 123 and planar electrode 122 is shorter than the distance between planar electrode 123 and planar electrode 121.

[0065] Through-hole electrodes 131-134 form an inductor. Planar electrodes 122 and 123 are opposite to each other in the Z-axis direction and form a capacitor.

[0066] Figure 10 Viewed from the Z-axis Figure 9 The diagram shows the resonant element 12. Figure 10 As shown, when the planar electrode 123 is viewed from above along the Z-axis, the through-hole electrode 131, the region Rg21 between through-hole electrode 131 and through-hole electrode 133, the region Rg22 between through-hole electrode 133 and through-hole electrode 132, the region Rg23 between through-hole electrode 132 and through-hole electrode 134, the through-hole electrode 134, and the region Rg24 between through-hole electrode 134 and through-hole electrode 131 form an annular region. Within this annular region, through-hole electrodes 131 and 132 connecting the planar electrode 121 and the planar electrode 123, and through-hole electrodes 133 and 134 connecting the planar electrode 121 and the planar electrode 122, are alternately arranged. The imaginary line VL21 (first imaginary line) intersects with the imaginary line VL22 (second imaginary line). The imaginary line VL21 is the imaginary line connecting the through-hole electrode 131 and the through-hole electrode 132, and the imaginary line VL22 is the imaginary line connecting the through-hole electrode 133 and the through-hole electrode 134.

[0067] The direction of the current flowing in the through-hole electrode 131 and the direction of the current flowing in the through-hole electrode 132 are the same. The direction of the current flowing in the through-hole electrode 133 and the direction of the current flowing in the through-hole electrode 134 are the same. The direction of the current flowing in the through-hole electrode 131 and the direction of the current flowing in the through-hole electrode 133 are opposite.

[0068] The planar electrode 123 includes a portion Pr21 (first portion) that is a portion connecting the through-hole electrode 131 and a portion Pr22 (second portion) that is a portion connecting the through-hole electrode 132. A part of the portion Pr21 and a part of the portion Pr22 do not overlap the planar electrodes 121, 122.

[0069] Even if the relative positional relationship of the planar electrode 122 and the planar electrode 123 is shifted due to manufacturing variation, since there is a portion (margin) of the planar electrode 123 that does not overlap the planar electrode 122, it is possible to suppress a decrease in the area of the portion of the planar electrode 123 that overlaps the planar electrode 122. Since manufacturing variation in the capacitance of the capacitor formed by the planar electrode 122 and the planar electrode 123 is suppressed, it is possible to suppress manufacturing variation in the characteristics of the resonant element 12.

[0070] In addition, since the width of the planar electrode 123 is relatively wide, it is possible to make the capacitance of the capacitor formed by the planar electrode 122 and the planar electrode 123 relatively large. Therefore, the necessity of bringing the planar electrode 122 and the planar electrode 123 close to each other in order to increase the capacitance of the capacitor is low. Since it is possible to secure a certain degree of spacing between the planar electrode 122 and the planar electrode 123, it is possible to reduce the risk of short-circuiting the planar electrode 121 and the planar electrode 122 due to the through-hole electrodes 121, 122 penetrating the planar electrode 123 when the resonant element 12 is manufactured.

[0071] With the resonant element according to Embodiment 2 and the modification, it is possible to improve the insertion loss of the resonant element. In addition, with the resonant element according to Embodiment 2, it is possible to reduce manufacturing variation in the characteristics of the resonant element and the risk of short-circuiting the two planar electrodes.

[0072] [Embodiment 3]

[0073] In Embodiments 1, 2, a case in which the number of through-hole electrodes connecting the first planar electrode and the third planar electrode and the number of through-hole electrodes connecting the first planar electrode and the second planar electrode are each two is described. The number of through-hole electrodes can be three or more. In Embodiment 3, a case in which the number of through-hole electrodes is three is described.

[0074] Figure 11is a perspective view of a plurality of electrodes that form the resonant element 13 of Embodiment 3. As shown in Figure 11 The resonant element 13 includes a planar electrode 141 (first planar electrode), a planar electrode 142 (second planar electrode), a planar electrode 143 (third planar electrode), a via electrode 151 (first via electrode), a via electrode 152 (second via electrode), a via electrode 153 (third via electrode), a via electrode 154 (fourth via electrode), a via electrode 155 (fifth via electrode), and a via electrode 156 (sixth via electrode).

[0075] The planar electrode 143 is disposed between the planar electrode 141 and the planar electrode 142 in the normal direction (Z-axis direction) of the planar electrode 141. The via electrodes 151, 152, and 155 extend in the Z-axis direction and connect the planar electrode 121 and the planar electrode 123. The via electrodes 153, 154, and 156 extend in the Z-axis direction and connect the planar electrode 141 and the planar electrode 142.

[0076] The via electrodes 151, 152, and 155 are shorter than each of the via electrodes 153, 154, and 156, respectively. The planar electrode 143 is closer to the planar electrode 142 than to the planar electrode 141.

[0077] The via electrodes 151 to 156 form an inductor. The planar electrode 142 and the planar electrode 143 face each other in the Z-axis direction and form a capacitor.

[0078] Figure 12 is a view of the resonant element 13 viewed from the Z-axis direction. Figure 11 As shown in Figure 12 When the planar electrode 143 is viewed from the Z-axis direction, the via electrode 151, a region Rg31 between the via electrode 151 and the via electrode 153, the via electrode 153, a region Rg32 between the via electrode 153 and the via electrode 152, the via electrode 152, a region Rg35 between the via electrode 152 and the via electrode 156, the via electrode 156, a region Rg36 between the via electrode 156 and the via electrode 155, the via electrode 155, a region Rg37 between the via electrode 155 and the via electrode 154, the via electrode 154, and a region Rg34 between the via electrode 154 and the via electrode 151 form a ring-shaped region. In the ring-shaped region, the via electrodes 151, 152, and 155 that connect the planar electrode 141 and the planar electrode 143 and the via electrodes 153, 154, and 156 that connect the planar electrode 121 and the planar electrode 122 are alternately disposed.

[0079] The imaginary line VL31 (first imaginary line) and the imaginary line VL32 (second imaginary line) intersect, where the imaginary line VL31 is an imaginary line connecting the via electrode 151 and the via electrode 152, and the imaginary line VL32 is an imaginary line connecting the via electrode 153 and the via electrode 154. The imaginary line VL33 (third imaginary line) and the imaginary line VL34 (fourth imaginary line) intersect, where the imaginary line VL33 is an imaginary line connecting the via electrode 152 and the via electrode 155, and the imaginary line VL34 is an imaginary line connecting the via electrode 154 and the via electrode 156.

[0080] The direction of the current flowing in the via electrode 151, the direction of the current flowing in the via electrode 152, and the direction of the current flowing in the via electrode 155 are the same. The direction of the current flowing in the via electrode 153, the direction of the current flowing in the via electrode 154, and the direction of the current flowing in the via electrode 156 are the same. The direction of the current flowing in the via electrode 151 and the direction of the current flowing in the via electrode 153 are opposite.

[0081] Further, the via electrode 151, the region Rg31, the via electrode 153, the region Rg32, the via electrode 152, the region Rg33 between the via electrode 152 and the via electrode 154, the via electrode 154, and the region Rg34 also form a ring-shaped region as in Embodiment 1.

[0082] The planar electrode 143 includes a portion Pr31 (first portion) connected to the via electrode 151, a portion Pr32 (second portion) connected to the via electrode 152, and a portion Pr33 (third portion) connected to the via electrode 155. A part of the portion Pr31, a part of the portion Pr32, and a part of the portion Pr33 do not overlap the planar electrodes 141, 142.

[0083] In the resonant element 13, as in Embodiment 2, it is possible to reduce the manufacturing variation of the characteristics of the resonant element 13, and the risk of short-circuiting between the planar electrode 141 and the planar electrode 142.

[0084] In addition, the number of via electrodes connecting the planar electrode 141 and the planar electrode 143, and the number of via electrodes connecting the planar electrode 141 and the planar electrode 142 are each three, so the current flowing between the two planar electrodes is more dispersed than in Embodiments 1, 2. As a result, it is possible to further improve the insertion loss of the resonant element 13 compared to Embodiments 1, 2.

[0085] According to the resonant element of Embodiment 3, the insertion loss of the resonant element can be further improved compared to Embodiments 1 and 2. In addition, according to the resonant element of Embodiment 3, the manufacturing variation of the characteristics of the resonant element and the risk of short-circuiting of the two planar electrodes can be reduced.

[0086] It is also intended that each of the embodiments disclosed in this specification be appropriately combined where non-contradictory. It should be considered that the embodiments disclosed in this specification are illustrative in all respects, and are not restrictive. The scope of the present application is not represented by the above description, but is represented by the claims, and is intended to include all modifications within the meaning and range equivalent to the claims.

[0087] Explanation of Reference Numerals

[0088] 1...duplexer; 9, 10, 12, 13, 20...resonant element; 100...laminate; 101 to 103, 121 to 123, 130, 141 to 143, 161, 162, 165 to 167, 170, 201 to 203, 901 to 903...planar electrode; 111 to 114, 121, 122, 131 to 134, 151 to 156, 211 to 214, 301 to 315, 911 to 915...via electrode; 163, 164, 168, 169...line electrode; C1, C2, C11, C21...capacitor; DM...direction identification mark; G1, G2...ground terminal; L1, L2, L11, L21...inductor; P1 to P3, P11, P12, P21, P22, P91, P92...terminal; Pcom...common terminal; Pr21, Pr22, Pr31 to Pr33...portion; VL11 to VL14, VL21, VL22, VL31 to VL34...imaginary line.

Claims

1. A resonant element comprising: a laminate; a first planar electrode provided on the laminate; a second planar electrode provided on the laminate; a third planar electrode provided on the laminate, the third planar electrode being disposed between the first planar electrode and the second planar electrode in a normal direction of the first planar electrode; a first via electrode and a second via electrode connecting the first planar electrode and the third planar electrode; and a third via electrode and a fourth via electrode connecting the first planar electrode and the second planar electrode, wherein the first imaginary line is an imaginary line connecting the first via electrode and the second via electrode, the second imaginary line is an imaginary line connecting the third via electrode and the fourth via electrode, a direction of current flowing in the first via electrode is the same as a direction of current flowing in the second via electrode, a direction of current flowing in the third via electrode is the same as a direction of current flowing in the fourth via electrode, and a direction of current flowing in the first via electrode is opposite to a direction of current flowing in the third via electrode.

2. The resonant element according to claim 1, wherein a terminal is formed in the third planar electrode, and the terminal does not overlap the first planar electrode and the second planar electrode when the third planar electrode is viewed from the normal direction.

3. The resonant element according to claim 1 or 2, wherein the third planar electrode has a first portion and a second portion, the first portion is a portion connecting the first via electrode, the second portion is a portion connecting the second via electrode, and a portion of the first portion and a portion of the second portion do not overlap the second planar electrode when the third planar electrode is viewed from the normal direction.

4. The resonant element according to any one of claims 1 to 3, further comprising: a fifth via electrode connecting the first planar electrode and the third planar electrode; and a sixth via electrode connecting the first planar electrode and the second planar electrode, wherein a third imaginary line and a fourth imaginary line intersect when the first planar electrode is viewed from the normal direction, the third imaginary line is an imaginary line connecting the second via electrode and the fifth via electrode, and the fourth imaginary line is an imaginary line connecting the fourth via electrode and the sixth via electrode.

5. The resonant element according to claim 4, wherein a direction of current flowing in the first via electrode, a direction of current flowing in the second via electrode, and a direction of current flowing in the fifth via electrode are the same, a direction of current flowing in the third via electrode, a direction of current flowing in the fourth via electrode, and a direction of current flowing in the sixth via electrode are the same, and a direction of current flowing in the first via electrode is opposite to a direction of current flowing in the third via electrode.

6. The resonant element according to claim 4, wherein ​ When the first planar electrode is viewed from the normal direction, the first imaginary line and the second imaginary line intersect, and ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 4. The resonant element according to claim 1 or 2, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ The first via electrode, the fourth via electrode, and the fifth via electrode are arranged along a first direction orthogonal to an extension direction of the first via electrode, The third via electrode, the second via electrode, and the sixth via electrode are arranged along a second direction orthogonal to the extension direction.

7. The resonant element according to claim 4, wherein The third planar electrode further includes a third portion, wherein the third portion is a portion connected to the fifth via electrode, When the third planar electrode is viewed from the normal direction, a portion of the third portion does not overlap the second planar electrode.

8. A filter comprising the resonant element according to any one of claims 1 to 7.

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