Filter and electronic device

Abstract

In an electronic device (1), a second end of a first LC parallel resonator (R1) and a second end of a second LC parallel resonator (R2) are connected at contacts (P3, P4), a capacitor (C3) and an inductor (L3) are connected in series with respect to a contact (P1), a capacitor (C5) and an inductor (L4) are connected in series with respect to a contact (P2), and a capacitor (C4) and inductors (L5, L6) are connected in series with respect to a contact (P4). The capacitor (C3) and the inductor (L3), the capacitor (C5) and the inductor (L4), and the capacitor (C4) and the inductors (L5, L6) are connected at contacts (P6, P7), and the inductors (L7, L8) are connected to the contacts (P6, P7).

Description

Technical Field

[0001] The present disclosure relates to filters and electronic devices. Background Art

[0002] Japanese Patent Publication No. 2002-204136 discloses a filter comprising a stacked low-pass filter formed by stacking and integrating a magnetic layer with a built-in coil and a dielectric layer with a built-in capacitor. The filter comprises two coils connected in series, three grounded capacitors connected between the connection point and the ends of the series coils, and three electrostatic capacitors located between the connection point and the ends of the series coils. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] Electronic components are mounted on other electronic devices (e.g., circuit boards). Within electronic devices, wiring components located on the mounting surface of the electronic component are electrically connected to other components located on the other surface (layer) via through-holes. If the position of the through-holes in the wiring components connected to the grounding members of an electronic device deviates, the inductance component fluctuates. If a filter (electronic component) is installed in an electronic device in an environment where the inductance component fluctuates, the filter's characteristics may also change due to the fluctuations in the inductance component of the electrical device.

[0005] One aspect of the present disclosure aims to provide a filter and an electronic device capable of suppressing changes in characteristics even in an environment where an inductance component may fluctuate in an electronic device in which the filter is installed.

[0006] (2) Technical solution

[0007] (1) A filter according to one aspect of the present disclosure includes: a first input / output port; a second input / output port; a first LC parallel resonator and a second LC parallel resonator, which are connected in series between the first input / output port and the second input / output port; a first capacitor, a second capacitor, and a third capacitor; a first inductor, a second inductor, and a third inductor; and a grounded inductor connected to a ground member, wherein a first end of the first LC parallel resonator and the first input / output port are connected at a first connection point, a first end of the second LC parallel resonator and the second input / output port are connected at a second connection point, a second end of the first LC parallel resonator and a second end of the second LC parallel resonator are connected at a third connection point, the first capacitor and the first inductor are connected in series at the first connection point, the second capacitor and the second inductor are connected in series at the second connection point, the third capacitor and the third inductor are connected in series at the third connection point, the first capacitor and the first inductor, the second capacitor and the second inductor, and the third capacitor and the third inductor are connected at a fourth connection point, and the grounded inductor is connected to the fourth connection point.

[0008] In one aspect of the present disclosure, a filter includes, in addition to a grounded inductor, a first inductor, a second inductor, and a third inductor. In the filter, the first inductor, the second inductor, and the third inductor are connected to the grounded inductor via a fourth contact. This increases the inductance component of the grounded inductor in the filter. Therefore, even in an electronic device equipped with the filter in an environment where the inductance component may fluctuate, the impact of this fluctuation on the filter can be reduced. Consequently, changes in the filter's characteristics can be suppressed.

[0009] (2) In the filter of (1) above, the third inductor may be configured to include two or more inductance components. In this configuration, the inductance component of the grounded inductor can be increased in the filter.

[0010] (3) In the filter of (1) or (2) above, the grounded inductor may be configured to include two or more inductance components. In this configuration, the inductance component of the grounded inductor can be increased in the filter.

[0011] (4) In any of the filters of (1) to (3) above, the inductances of the first inductor, the second inductor, and the third inductor may be larger than the inductance of the grounded inductor. In this configuration, the inductance of the grounded inductor can be increased.

[0012] (5) An electronic device according to one aspect of the present disclosure comprises: a body having a main surface and a mounting surface facing each other; a plurality of terminal electrodes arranged on the body, including a ground terminal electrode connected to a grounding member; a first grounded inductor conductor, a second grounded inductor conductor, a capacitor conductor, and a ground conductor arranged in the body, the first grounded inductor conductor being connected to the ground terminal electrode, the capacitor conductor and the ground conductor being arranged near the mounting surface, the first grounded inductor conductor being arranged between the ground conductor and the main surface in a direction in which the main surface and the mounting surface face each other, the second grounded inductor conductor being arranged between the capacitor conductor and the mounting surface in a direction in which the main surface and the mounting surface face each other, the first grounded inductor conductor and the second grounded inductor conductor being connected via a connecting conductor, and the ground conductor being connected to the first grounded inductor conductor.

[0013] In an electronic device according to one aspect of the present disclosure, a first grounded inductor conductor connected to a ground terminal electrode and a second grounded inductor conductor are connected via a connecting conductor, and the ground conductor is connected to the first grounded inductor conductor. Thus, in the electronic device, the inclusion of the first and second grounded inductor conductors increases the inductance component of the grounded inductor. Therefore, even in an electronic device in which the electronic device is installed, where the inductance component may fluctuate, the impact of such fluctuations on the electronic device can be minimized. Consequently, fluctuations in the characteristics of the electronic device can be suppressed.

[0014] (6) In the electronic device of (5) above, the inductance of the second grounded inductor conductor may be larger than the inductance of the first grounded inductor conductor.

[0015] (7) In the electronic device of (5) or (6) above, the second grounded inductor conductor may be longer than the first grounded inductor conductor. In this configuration, the inductance of the second grounded inductor conductor can be set to be greater than the inductance of the first grounded inductor conductor.

[0016] (8) In any of the electronic devices described in (5) to (7) above, the first grounded inductor conductor and the second grounded inductor conductor may each include two conductors, the connecting conductor may include a first connecting conductor and a second connecting conductor, the first grounded inductor conductor and the second grounded inductor conductor being connected by the first connecting conductor, and the second grounded inductor conductor and the first grounded inductor conductor being connected by the second connecting conductor. This configuration can increase the inductance component of the grounded inductor.

[0017] (9) In the electronic device of (8) above, the capacitor conductor and the two first grounded inductor conductors may be integrally formed, the capacitor conductor extending in one direction, one first grounded inductor conductor connected to one end portion of the capacitor conductor in the extending direction, and the other first grounded inductor conductor connected to the other end portion of the capacitor conductor in the extending direction, the first connecting conductor being provided at the one end portion of the capacitor conductor in the extending direction, and the second connecting conductor being provided at the other end portion of the capacitor conductor in the extending direction.

[0018] (10) In the electronic device described in (8) or (9), the two first grounded inductor conductors and the two second grounded inductor conductors may be arranged symmetrically. In this configuration, by symmetrically arranging the two first grounded inductor conductors and the two second grounded inductor conductors, it is possible to suppress variations in characteristics.

[0019] (3) Beneficial effects

[0020] According to one aspect of the present disclosure, even in an environment where an inductance component may vary in an installed electronic device, a change in characteristics can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an equivalent circuit diagram of the electronic device according to the first embodiment.

[0022] Figure 2 yes Figure 1 A perspective view of the electronic device shown.

[0023] Figure 3 yes Figure 1 A perspective view of the electronic device shown.

[0024] Figure 4 yes Figure 1 A side view of the electronic device is shown.

[0025] Figure 5 yes Figure 1 An end view of the electronic device is shown.

[0026] Figure 6 yes Figure 1 An end view of the electronic device is shown.

[0027] Figure 7 yes Figure 1 An exploded perspective view of the electronic device shown.

[0028] Figure 8 It is a perspective view of an electronic device according to a second embodiment.

[0029] Figure 9 yes Figure 8 A perspective view of the electronic device shown. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and repeated descriptions are omitted.

[0031] [First embodiment] Figure 1This is an equivalent circuit diagram of an electronic device according to the first embodiment. Electronic device 1 includes an input port (first input / output port) IN for inputting signals, an output port (second input / output port) OUT for outputting signals, inductor L1, inductor L2, inductor (first inductor) L3, inductor (second inductor) L4, inductor (third inductor) L5, inductor (third inductor) L6, inductor (grounded inductor) L7, inductor (grounded inductor) L8, capacitor C1, capacitor C2, capacitor (first capacitor) C3, capacitor (third capacitor) C4, and capacitor (second capacitor) C5. Electronic device 1 is, for example, a low-pass filter.

[0032] Inductor L1 and inductor L2 are electrically connected in series. Capacitor C1 and capacitor C2 are electrically connected in series. Inductor L1 and capacitor C1 are electrically connected in parallel. Inductor L2 and capacitor C2 are electrically connected in parallel. Capacitor C3, capacitor C4, and capacitor C5 are electrically connected in parallel. Inductor L3, inductor L4, inductor L5, and inductor L6 are electrically connected in parallel. Inductor L5 and inductor L7 are electrically connected in series. Inductor L6 and inductor L8 are electrically connected in series. Inductor L3 and capacitor C3 are electrically connected in series. Inductor L4 and capacitor C5 are electrically connected in series. Inductor L5 and capacitor C4 are electrically connected in series. Inductor L6 and capacitor C4 are electrically connected in series.

[0033] Inductor L1 and capacitor C1 form a first LC parallel resonator R1. Inductor L2 and capacitor C2 form a second LC parallel resonator R2. Inductor L3, inductor L4, inductor L5, inductor L6, inductor L7, and inductor L8 form a grounding inductor Lg. In this embodiment, grounding inductor Lg does not include any inductors formed from wiring components or the like.

[0034] The first end (the end on the input port IN side) of the first LC parallel resonator R1 is connected to a contact (first contact) P1. Contact P1 is the connection point with the input port IN. In other words, the input port IN and the first LC parallel resonator R1 are connected via contact P1. In this embodiment, connection via contact P1 means that no other components are present between the input port IN and the first LC parallel resonator R1. In the first LC parallel resonator R1, the first end is the end closest to the input port IN.

[0035] The first end of the second LC parallel resonator R2 (the end on the output port OUT side) is connected to the contact point (second contact point) P2. Contact point P2 is the connection point with the output port OUT. In other words, the output port OUT and the second LC parallel resonator R2 are connected via contact point P2. In the second LC parallel resonator R2, the first end is the end closest to the output port OUT.

[0036] The second end of the first LC parallel resonator R1 (the end of the inductor L1) is connected to the connection point (third connection point) P3. The second end of the second LC parallel resonator R2 (the end of the inductor L2) is connected to the connection point P3. Connection point P3 is the connection point between the first LC parallel resonator R1 and the second LC parallel resonator R2. The second end of the first LC parallel resonator R1 (the end of the capacitor C1) is connected to the connection point (third connection point) P4. The second end of the second LC parallel resonator R2 (the end of the capacitor C2) is connected to the connection point P4. Connection point P4 is the connection point between the first LC parallel resonator R1 and the second LC parallel resonator R2.

[0037] The first end of capacitor C3 is connected to point P1. The second end of capacitor C3 is connected to the first end of inductor L3. The first end of capacitor C4 is connected to point P4. The second end of capacitor C4 is connected to point P5. Point P5 is the connection point between capacitor C4, inductor L5, and inductor L6. The first end of capacitor C5 is connected to point P2. The second end of capacitor C5 is connected to the first end of inductor L4.

[0038] The first end of inductor L3 is connected to the second end of capacitor C3. The second end of inductor L3 is connected to node (fourth node) P6. Node P6 is the connection point between inductor L3, inductor L5, and inductor L7. The first end of inductor L4 is connected to the second end of capacitor C5. The second end of inductor L4 is connected to node (fourth node) P7. Node P7 is the connection point between inductor L4, inductor L6, and inductor L8. The first end of inductor L5 is connected to node P5. The second end of inductor L5 is connected to node P6. The first end of inductor L6 is connected to node P5. The second end of inductor L6 is connected to node P7.

[0039] A first end of the inductor L7 is connected to the node P6 , a second end of the inductor L7 is connected to the ground Gnd1 , a first end of the inductor L8 is connected to the node P7 , and a second end of the inductor L8 is connected to the ground Gnd2 .

[0040] In electronic device 1, capacitor C3 and inductor L3 are electrically connected to capacitor C4 and inductor L5 at point P6 (they merge at point P6) and are connected to inductor L7. In electronic device 1, capacitor C5 and inductor L4 are electrically connected to capacitor C4 and inductor L6 at point P7 and are connected to inductor L8.

[0041] The inductances of the inductor L3 , the inductor L4 , the inductor L5 , and the inductor L6 are larger than the inductances of the inductor L7 and the inductor L8 .

[0042] Figure 2 yes Figure 1A perspective view of the electronic device shown. Figure 3 yes Figure 1 A perspective view of the electronic device shown. Figure 4 yes Figure 1 A side view of the electronic device is shown. Figure 5 yes Figure 1 An end view of the electronic device is shown. Figure 6 yes Figure 1 An end view of the electronic device shown in FIG. Figures 2 to 6 As shown, the electronic device 1 includes an element body 2 , and first, second, third, fourth, fifth, and sixth terminal electrodes 3 , 4 , 5 , 6 , 7 , and 8 disposed at both ends of the element body 2 .

[0043] The element body 2 has a rectangular parallelepiped shape. This rectangular parallelepiped shape includes a shape with chamfered corners and edges, and a shape with rounded corners and edges. The element body 2 has, as its outer surfaces, a pair of opposing end faces 2a and 2b, a pair of opposing principal faces 2c and 2d, and a pair of opposing side faces 2e and 2f. The pair of end faces 2a and 2b face in a first direction D1. The pair of principal faces 2c and 2d face in a second direction D2. The pair of side faces 2e and 2f face in a third direction D3.

[0044] In this embodiment, the first direction D1 is the length direction of the element body 2. The second direction D2 is the height direction of the element body 2 and is perpendicular to the first direction D1. The third direction D3 is the width direction of the element body 2 and is perpendicular to the second direction D2 and the first direction D1.

[0045] The pair of end surfaces 2a and 2b extend in the second direction D2, connecting the pair of principal surfaces 2c and 2d. The pair of end surfaces 2a and 2b also extend in the third direction D3 (the direction of the shorter sides of the pair of principal surfaces 2c and 2d). The pair of side surfaces 2e and 2f extend in the second direction D2, connecting the pair of principal surfaces 2c and 2d. The pair of side surfaces 2e and 2f also extend in the first direction D1 (the direction of the longer sides of the pair of principal surfaces 2c and 2d). The principal surface 2d can be defined as a mounting surface, which faces the other electronic device when the electronic device 1 is mounted on the other electronic device (e.g., a circuit board or electronic device).

[0046] The element body 2 is formed by stacking a plurality of dielectric layers 9 (see Figure 7). Each dielectric layer 9 is stacked in the second direction D2. That is, the second direction D2 is the stacking direction. The element body 2 comprises a plurality of stacked dielectric layers 9. Each dielectric layer 9 is formed, for example, from a sintered body of a ceramic green sheet containing a dielectric material (e.g., a BaTiO3-based, Ba(Ti, Zr)O3-based, or (Ba, Ca)TiO3-based dielectric ceramic). In the actual element body 2, the plurality of dielectric layers 9 are integrated to such an extent that the boundaries between the layers are not visually discernible.

[0047] The first terminal electrode 3, the second terminal electrode 4, and the third terminal electrode 5 are arranged on the side surface 2e of the element body 2. The first terminal electrode 3, the second terminal electrode 4, and the third terminal electrode 5 are formed so as to cover a portion of the side surface 2e along the second direction D2 of the element body 2, and are formed on a portion of the principal surface 2c and a portion of the principal surface 2d. The first terminal electrode 3 is located on the end surface 2a side, and the third terminal electrode 5 is located on the end surface 2b side. The second terminal electrode 4 is located between the first terminal electrode 3 and the third terminal electrode 5.

[0048] The fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 are arranged on the side surface 2f of the element body 2. The fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 are formed so as to cover a portion of the side surface 2f along the second direction D2 of the element body 2, and are formed on a portion of the principal surface 2c and a portion of the principal surface 2d. The fourth terminal electrode 6 is located on the end surface 2a side, and the sixth terminal electrode 8 is located on the end surface 2b side. The fifth terminal electrode 7 is located between the fourth terminal electrode 6 and the sixth terminal electrode 8.

[0049] The first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, the fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 contain a conductive material (e.g., Ag or Pd). The first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, the fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 are formed as a sintered body of a conductive paste containing a conductive material (e.g., Ag powder or Pd powder). A plating layer may be formed on the surfaces of the first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, the fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8. The plating layer is formed, for example, by electroplating. The plating layer may have a layer structure consisting of Cu plating, Ni plating, and Sn plating, or a layer structure consisting of Ni plating and Sn plating.

[0050] The second terminal electrode 4 constitutes the output port OUT (see Figure 1 ). The fourth terminal electrode 6 constitutes the ground Gnd1 (refer to Figure 1 The fifth terminal electrode 7 constitutes the input port IN (refer to Figure 1 ). The sixth terminal electrode 8 constitutes the ground Gnd2 (refer to Figure 1 The fourth terminal electrode 6 and the sixth terminal electrode 8 are ground terminal electrodes connected to a ground of the electronic device.

[0051] Figure 7 1 is an exploded perspective view of the electronic device 1. Figure 7 As shown, the electronic device 1 includes an inductor conductor 10, an inductor conductor 11, an inductor conductor 12, an inductor conductor 13, an inductor conductor 14, an inductor conductor 15, an inductor conductor 16, an inductor conductor 17, an inductor conductor 18, an inductor conductor 19, a through-hole conductor 20, a through-hole conductor 21, a through-hole conductor 22, a through-hole conductor 23, a through-hole conductor 24, a through-hole conductor 25, a through-hole conductor 26, a through-hole conductor 27, a through-hole conductor 28, a through-hole conductor 29, a through-hole conductor 30, a through-hole conductor 31, a through-hole conductor 32, a capacitor conductor 33, a capacitor conductor 34, a capacitor conductor 35, a conductor 36, and a conductor 37.

[0052] Inductor conductor 10 and inductor conductor 11 are arranged on the same dielectric layer 9. Inductor conductor 12 and inductor conductor 13 are arranged on the same dielectric layer 9. Inductor conductor 14 and inductor conductor 15 are arranged on the same dielectric layer 9. Inductor conductor 16 and inductor conductor 17 are arranged on the same dielectric layer 9. Via-hole conductor 27, via-hole conductor 28, and capacitor conductor 33 are arranged on the same dielectric layer 9. Via-hole conductor 29, via-hole conductor 30, capacitor conductor 34, and capacitor conductor 35 are arranged on the same dielectric layer 9. Via-hole conductor 31 and via-hole conductor 32 are arranged on the same dielectric layer 9. Via-hole conductor 26 and conductor 36 are arranged on the same dielectric layer 9.

[0053] In this embodiment, inductor conductors 10 and 12 have the same shape. Inductor conductors 11 and 13 have the same shape. Inductor conductors 14 and 16 have the same shape. Inductor conductors 15 and 17 have the same shape. Inductor conductors 18 and 19 have the same shape.

[0054] The inductor conductor 10, the inductor conductor 11, the inductor conductor 12, the inductor conductor 13, the inductor conductor 14, the inductor conductor 15, the inductor conductor 16, the inductor conductor 17, the inductor conductor 18, and the inductor conductor 19 are arranged in a position close to the principal surface 2c (positions close to the principal surface 2c) in the element body 2. Specifically, the inductor conductor 10, the inductor conductor 11, the inductor conductor 12, the inductor conductor 13, the inductor conductor 14, the inductor conductor 15, the inductor conductor 16, the inductor conductor 17, the inductor conductor 18, and the inductor conductor 19 are arranged in a region closer to the principal surface 2c than the center of the element body 2 in the second direction D2.

[0055] The capacitor conductors 33, 34, 35, 36, and 37 are arranged in a position close to the principal surface 2d (close to the principal surface 2d) in the element body 2. Specifically, the capacitor conductors 33, 34, 35, 36, and 37 are arranged in a region closer to the principal surface 2d than the center of the element body 2 in the second direction D2.

[0056] The conductor 36, capacitor conductor 33, capacitor conductor 34 (capacitor conductor 35), and conductor 37 are arranged in this order from the main surface 2c toward the main surface 2d in the second direction D2. The conductor 36 is arranged between the main surface 2c and the conductor 37 in the second direction D2. The conductor 37 is arranged between the main surface 2d and the conductor 36 in the second direction D2.

[0057] The conductor 36 includes a first conductor portion 36A, a second conductor portion (a first grounded inductor conductor, one first grounded inductor conductor) 36B, and a third conductor portion (a first grounded inductor conductor, the other first grounded inductor conductor) 36C. The first conductor portion 36A, the second conductor portion 36B, and the third conductor portion 36C are integrally formed. In this embodiment, the conductor 36 has a pipe shape (a generally U-shaped shape). The conductor 36 has a symmetrical shape (a shape having a symmetrical relationship). The conductor 36 has linear symmetry about a line along the third direction D3.

[0058] The first conductor portion 36A has a rectangular (strip-like) shape and extends along the first direction D1. The first conductor portion 36A functions as an inductor conductor and a capacitor conductor. The second conductor portion 36B is connected to one end of the first conductor portion 36A (the end facing the end surface 2a). The second conductor portion 36B has a rectangular shape and extends along the third direction D3. The third conductor portion 36C is connected to the other end of the first conductor portion 36A (the end facing the end surface 2b). The third conductor portion 36C has a rectangular shape and extends along the third direction D3.

[0059] The conductor 37 includes a first conductor portion 37A, a second conductor portion (a second grounded inductor conductor, one second grounded inductor conductor) 37B, and a third conductor portion (a second grounded inductor conductor, the other second grounded inductor conductor) 37C. The first conductor portion 37A, the second conductor portion 37B, and the third conductor portion 37C are integrally formed. The conductor 37 has a symmetrical shape. The conductor 37 has linear symmetry about a line along the third direction D3.

[0060] The first conductor portion 37A has a rectangular shape. The first conductor portion 37A functions as a ground conductor. The second conductor portion 37B extends from the end of the first conductor portion 37A on the end surface 2a side. The third conductor portion 37C extends from the end of the first conductor portion 37A on the end surface 2b side.

[0061] The length (path length) of the second conductor portion 37B is longer than that of the second conductor portion 36B. In other words, the length of the second conductor portion 36B is shorter than that of the second conductor portion 37B. The length of the third conductor portion 37C is longer than that of the third conductor portion 36C. In other words, the length of the third conductor portion 36C is shorter than that of the third conductor portion 37C.

[0062] The inductor conductor 10 is exposed on the side surface 2f and connected to the fifth terminal electrode 7. The inductor conductor 11 is exposed on the side surface 2e and connected to the second terminal electrode 4. The inductor conductor 12 is exposed on the side surface 2f and connected to the fifth terminal electrode 7. The inductor conductor 13 is exposed on the side surface 2e and connected to the second terminal electrode 4.

[0063] The capacitor conductor 34 is exposed on the side surface 2f and connected to the fifth terminal electrode 7. The capacitor conductor 35 is exposed on the side surface 2e and connected to the second terminal electrode 4. The second conductor portion 36B is exposed on the side surface 2f and connected to the fourth terminal electrode 6. The third conductor portion 36C is exposed on the side surface 2f and connected to the sixth terminal electrode 8.

[0064] Inductor conductor 10, inductor conductor 12, inductor conductor 14, inductor conductor 16, inductor conductor 18, and inductor conductor 19 constitute inductor L1. Inductor conductor 11, inductor conductor 13, inductor conductor 15, inductor conductor 17, inductor conductor 18, and inductor conductor 19 constitute inductor L2. Second conductor portion 37B constitutes inductor L3. Third conductor portion 37C constitutes inductor L4. First conductor portion 36A constitutes inductor L5. First conductor portion 36A constitutes inductor L6. Second conductor portion 36B constitutes inductor L7. Third conductor portion 36C constitutes inductor L8. First conductor portion 36A constitutes two inductance components (inductor L5 and inductor L6).

[0065] Capacitor conductor 33 and capacitor conductor 34 constitute capacitor C1. Capacitor conductor 33 and capacitor conductor 35 constitute capacitor C2. Capacitor conductor 34 and first conductor portion 37A constitute capacitor C3. Capacitor conductor 33 and first conductor portion 36A constitute capacitor C4. Capacitor conductor 35 and first conductor portion 37A constitute capacitor C5.

[0066] The via-hole conductor 20 , the via-hole conductor 21 , the via-hole conductor 22 , the via-hole conductor 23 , the via-hole conductor 24 , the via-hole conductor 25 , and the via-hole conductor 26 constitute a connection conductor 38 . The connection conductor 38 electrically connects the inductor conductor 19 and the capacitor conductor 33 .

[0067] The through-hole conductors 27, 29, and 31 constitute a first connection conductor (connection conductor) 39. The first connection conductor 39 electrically connects the conductor 36 and the conductor 37. The first connection conductor 39 connects one end portion in the extending direction of the first conductor portion 36A of the conductor 36 (the end portion on the end face 2a side of the substrate 2) and the end portion of the second conductor portion 37B of the conductor 37 (the front end portion opposite to the base end portion connected to the first conductor portion 37A).

[0068] The through-hole conductors 28, 30, and 32 constitute a second connection conductor (connection conductor) 40. The second connection conductor 40 electrically connects the conductor 36 and the conductor 37. The second connection conductor 40 connects the other end portion in the extending direction of the first conductor portion 36A of the conductor 36 (the end portion on the end face 2b side of the substrate 2) and the end portion of the third conductor portion 37C of the conductor 37 (the front end portion opposite to the base end portion connected to the first conductor portion 37A).

[0069] The conductor 36 and the conductor 37 are connected by the first connection conductor 39 and the second connection conductor 40, and thus are electrically connected to the fourth terminal electrode 6 and the sixth terminal electrode 8. The fourth terminal electrode 6 and the sixth terminal electrode 8 are mounted on a pad electrode (Japanese: ランド電極) connected to a grounding member in an electronic device. Thus, when the electronic device 1 is mounted in an electronic device, the conductor 36 and the conductor 37 are connected to the grounding member of the electrical device. Thus, in the electronic device 1, the first conductor portion 36A, the second conductor portion 36B, the third conductor portion 36C, the second conductor portion 37B, and the third conductor portion 37C function as a grounding inductor Lg (refer to Figure 1 ).

[0070] As described above, in the electronic device 1 of the present embodiment, in addition to the inductors L7 and L8, inductors L3, L4, L5, and L6 are also provided. In the electronic device 1, the inductors L3 and L5 are connected to the inductor L7 via the contact point P6. In the electronic device 1, the inductors L4 and L6 are connected to the inductor L8 via the contact point P7. Thus, in the electronic device 1, the inductance component of the grounding inductor Lg is increased. Therefore, in the electronic device 1, even in an environment where the inductance component may vary in the electronic device in which the electronic device 1 is mounted, the influence on the electronic device 1 due to the variation can be reduced. Therefore, in the electronic device 1, the change in characteristics can be suppressed.

[0071] [Second Embodiment]Next, the second embodiment will be described. Figure 8 It is a perspective view of the electronic device of the second embodiment. Figure 9 It is Figure 8 the perspective view of the electronic device shown. As Figure 8 and Figure 9As shown, the electronic device 1A includes an element body 2 , and first, second, third, fourth, fifth, and sixth terminal electrodes 3 , 4 , 5 , 6 , 7 , and 8 disposed at both ends of the element body 2 .

[0072] The structures of conductors 36 and 37 in electronic device 1A differ from those in electronic device 1. In electronic device 1, conductor 36 includes a first conductor portion 36A and a second conductor portion 36B. That is, in electronic device 1A, conductor 36 lacks the third conductor portion 36C found in electronic device 1. Conductor 37 includes a first conductor portion 37A and a second conductor portion 37B. That is, in electronic device 1A, conductor 37 lacks the third conductor portion 37C found in electronic device 1. Conductors 36 and 37 are connected by a single first connecting conductor 39.

[0073] As described above, electronic device 1A of this embodiment also includes inductor L3 and inductor L5 in addition to inductor L7. In electronic device 1A, inductor L3 and inductor L5 are connected to inductor L7 via contact P6. This increases the inductance component of grounded inductor Lg in electronic device 1A. Therefore, even if the inductance component of an electronic device in which electronic device 1A is installed fluctuates, the impact of this fluctuation can be minimized. Consequently, fluctuations in the characteristics of electronic device 1A can be suppressed.

[0074] As mentioned above, although embodiment of this disclosure was described, this disclosure is not necessarily limited to the said embodiment, Various changes are possible within the range which does not deviate from the summary.

[0075] In the above embodiment, the conductor 36 is described as an example in which the conductor 36 has a pipe shape. However, the shape of the conductor 36 is not limited to this. The same applies to the shape of the conductor 37.

[0076] In the above embodiment, the fourth terminal electrode 6 and the sixth terminal electrode 8 are ground terminal electrodes connected to a ground. However, the first terminal electrode 3 and the third terminal electrode 5 may also be ground terminal electrodes.

[0077] In the above embodiment, the inductor L1 is described as an example in which the inductor conductors 10, 12, 14, 16, 18, and 19 constitute the inductor. However, the number and shape of the inductor conductors constituting the inductor L1 are not limited thereto. The same applies to the inductor L2.

[0078] In the above embodiment, the first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, the fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 are each partially formed on the principal surface 2c and the principal surface 2d. However, the first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, the fourth terminal electrode 6, the fifth terminal electrode 7, and the sixth terminal electrode 8 may be formed only on the side surfaces 2e and 2f.

Claims

1. A filter comprising: a first input / output port; a second input / output port; A first LC parallel resonator and a second LC parallel resonator are connected in series between the first input / output port and the second input / output port; a first capacitor, a second capacitor, and a third capacitor; a first inductor, a second inductor, and a third inductor; A grounding inductor connected to the ground, The first end of the first LC parallel resonator and the first input-output port are connected at a first junction. The first end of the second LC parallel resonator and the second input-output port are connected at a second junction. The second end of the first LC parallel resonator and the second end of the second LC parallel resonator are connected at a third junction. With respect to the first connection point, the first capacitor and the first inductor are connected in series, With respect to the second connection point, the second capacitor and the second inductor are connected in series, With respect to the third connection point, the third capacitor and the third inductor are connected in series, The first capacitor and the first inductor, the second capacitor and the second inductor, and the third capacitor and the third inductor are connected at a fourth node. The ground inductor is connected to the fourth node.

2. The filter according to claim 1, wherein The third inductor includes two or more inductance components.

3. The filter according to claim 1 or 2, characterized in that The grounded inductor includes two or more inductance components.

4. The filter according to claim 1 or 2, characterized in that The inductances of the first inductor, the second inductor, and the third inductor are greater than the inductance of the ground inductor.

5. An electronic device comprising: A body having a main surface and a mounting surface facing each other; a plurality of terminal electrodes disposed on the element body, including a ground terminal electrode connected to a ground member; The first grounded inductor conductor, the second grounded inductor conductor, the capacitor conductor, and the ground conductor are arranged in the element body. The first grounded inductor conductor is connected to the ground terminal electrode. The capacitor conductor and the ground conductor are arranged at positions close to the mounting surface. The first grounded inductor conductor is arranged between the ground conductor and the main surface in the opposing direction of the main surface and the mounting surface. The second grounded inductor conductor is arranged between the capacitor conductor and the mounting surface in the opposing direction of the main surface and the mounting surface. The first grounded inductor conductor and the second grounded inductor conductor are connected by a connecting conductor, The ground conductor is connected to the first grounded inductor conductor.

6. The electronic device according to claim 5, characterized in that The inductance of the second grounded inductor conductor is greater than the inductance of the first grounded inductor conductor.

7. The electronic device according to claim 5 or 6, characterized in that: The second grounded inductor conductor has a length longer than that of the first grounded inductor conductor.

8. The electronic device according to claim 5 or 6, characterized in that: The first grounded inductor conductor and the second grounded inductor conductor each include two. The connecting conductor includes a first connecting conductor and a second connecting conductor. One of the first grounded inductor conductors and one of the second grounded inductor conductors are connected via the first connection conductor. The other first grounded inductor conductor and the other second grounded inductor conductor are connected via the second connection conductor.

9. The electronic device according to claim 8, characterized in that The capacitor conductor and the two first grounded inductor conductors are formed integrally, The capacitor conductor extends in one direction, One of the first grounded inductor conductors is connected to one end portion of the capacitor conductor in the extending direction. The other first grounded inductor conductor is connected to the other end portion of the capacitor conductor in the extending direction. The first connection conductor is provided at the one end portion of the capacitor conductor in the extending direction. The second connection conductor is provided at the other end portion of the capacitor conductor in the extending direction.

10. The electronic device according to claim 9, characterized in that The two first grounded inductor conductors and the two second grounded inductor conductors are arranged in a symmetrical relationship.

Images