filter

Abstract

A filter capable of suppressing a decrease in reliability is provided. [Solution] The filter (1) comprises a first ground conductor (26) arranged within the element body (2) closer to the principal surface (2c), a second ground conductor (27) arranged within the element body (2) closer to the principal surface (2d), and an inductor conductor and a capacitor conductor arranged within the element body (2). The third terminal electrode (5) has a first portion (5a) arranged on the principal surface (2c), a second portion (5b) arranged on the principal surface (2d), and a third portion (5c) arranged on the side surface (2e) and connecting the first portion (5a) and the second portion (5b). The first ground conductor (26) and the first portion (5a) of the third terminal electrode (5) are electrically connected by connecting conductors (14, 15, 16), and the second ground conductor (27) and the second portion (5b) of the third terminal electrode (5) are electrically connected by connecting conductors (20, 21, 22).

Description

[Technical Field]

[0001] The present disclosure relates to filters. [Background technology]

[0002] A known example of a filter is that described in Patent Document 1. The filter described in Patent Document 1 includes a laminate formed by stacking a plurality of insulator layers, first to fourth terminals provided on the surface of the laminate, a main line connected between the first and second terminals and provided on the insulator layer, a first sub-line connected to the third terminal and electromagnetically coupled to the main line, the first sub-line provided on the insulator layer, a second sub-line connected to the fourth terminal and electromagnetically coupled to the main line, the second sub-line provided on the insulator layer, and a ground conductor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-12323 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above filter, the ground conductor is connected to a terminal located on the side of the laminate via a flat connection part (draw-out part) exposed on the side of the laminate. In this configuration, foreign matter such as moisture or water may enter the laminate through a gap at the interface between the laminate and the connection part, which may reduce the reliability of the filter.

[0005] An object of one aspect of the present disclosure is to provide a filter that can suppress a decrease in reliability. [Means for solving the problem]

[0006] (1) A filter according to one aspect of the present disclosure includes: an element body having a mounting surface and a main surface facing each other and four side surfaces connecting the mounting surface and the main surface; a terminal electrode arranged on at least one of the four side surfaces, the terminal electrode being arranged across the mounting surface, the side surface, and the main surface; a first ground conductor arranged within the element body near the main surface; a second ground conductor arranged within the element body near the mounting surface; and an inductor conductor and a capacitor conductor arranged within the element body, wherein the terminal electrode has a first portion arranged on the main surface, a second portion arranged on the mounting surface, and a third portion arranged on the side surface and connecting the first portion and the second portion, the first ground conductor and the first portion of the terminal electrode being electrically connected by a first connecting conductor, and the second ground conductor and the second portion of the terminal electrode being electrically connected by a second connecting conductor, and each of the first connecting conductor and the second connecting conductor has a circular shape when viewed from the opposing direction of the mounting surface and the main surface.

[0007] In a filter according to one aspect of the present disclosure, the first connecting conductor and the second connecting conductor are circular, which can uniformly distribute stress on the first connecting conductor and the second connecting conductor. This can prevent gaps from forming between the element body and the first connecting conductor and the second connecting conductor. This can prevent foreign matter from entering the element body, thereby preventing a decrease in reliability.

[0008] Furthermore, in a filter, because the terminal electrodes are arranged across the mounting surface, side surfaces, and main surface, stress can be dispersed more effectively than in a configuration in which the terminal electrodes are arranged only on the mounting surface (bottom terminals). Therefore, in a filter, stress applied to the first connecting conductor and the second connecting conductor connected to the terminal electrodes can also be dispersed, thereby preventing gaps from forming between the element body and the first connecting conductor and the second connecting conductor. Therefore, in a filter, foreign matter can be prevented from entering the element body, preventing a decrease in reliability.

[0009] (2) In the filter of (1), at least one of the first connecting conductor and the second connecting conductor may be provided in plurality. In this configuration, the terminal electrode and the first ground conductor and / or the second ground conductor are connected by a plurality of first ground conductors and / or a plurality of second ground conductors. Therefore, since there are multiple paths connecting the terminal electrode and the first ground conductor and / or the second ground conductor, the ground can be strengthened.

[0010] (3) In any one of the filters (1) or (2) above, one end of the inductor conductor may be electrically connected to the first ground conductor, and the other end of the inductor conductor may be electrically connected to the capacitor conductor.

[0011] (4) In the filter of (4), the second ground conductor and the capacitor conductor may be disposed opposite each other in the opposing direction of the mounting surface and the main surface, thereby forming a capacitor.

[0012] (5) In the filter of (3) or (4), the inductor conductor may extend in the opposing direction between the mounting surface and the main surface. In this configuration, the capacitor conductor is suspended from the inductor conductor. This creates a space around the inductor conductor in the filter, ensuring an area where magnetic flux is generated around the inductor conductor, allowing a magnetic field to be formed around the inductor conductor. Therefore, the apparent volume of the inductor in the filter can be increased. As a result, the Q value of the filter can be improved. [Effects of the Invention]

[0013] According to one aspect of the present disclosure, a decrease in reliability can be suppressed. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a filter according to one embodiment. [Figure 2] FIG. 2 is a perspective view of the filter shown in FIG. [Figure 3] FIG. 3 is a side view of the filter shown in FIG. [Figure 4] FIG. 4 is a view of the filter shown in FIG. 1 as seen from one end face side. [Figure 5] FIG. 5 is a view of the filter shown in FIG. 1 as seen from the other end face side. [Figure 6] FIG. 6 is an exploded perspective view of the filter. [Figure 7] FIG. 7 is a perspective view of the filter shown in FIG. [Figure 8] FIG. 8 is an equivalent circuit diagram of the filter shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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 equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0016] FIG. 1 is a perspective view of a filter according to one embodiment. FIG. 2 is a see-through perspective view of the filter shown in FIG. 1. FIG. 3 is a view of the filter shown in FIG. 1 as seen from the side. FIG. 4 is a view of the filter shown in FIG. 1 as seen from one end face. FIG. 5 is a view of the filter shown in FIG. 1 as seen from the other end face. As shown in FIGS. 1 to 5, the filter 1 includes an element body 2, a first terminal electrode 3, a second terminal electrode 4, a third terminal electrode 5, and a fourth terminal electrode 6, which are respectively arranged on the element body 2, and a filter section 7.

[0017] The element body 2 has a rectangular parallelepiped shape. Rectangular parallelepiped shapes include those in which the corners and ridges are chamfered and those in which the corners and ridges are rounded. The element body 2 has, as its outer surfaces, a pair of end faces (side faces) 2a, 2b facing each other, a pair of main faces 2c, 2d facing each other, and a pair of side faces 2e, 2f facing each other. The facing direction in which the pair of end faces 2a, 2b face each other is a first direction D1. The facing direction in which the pair of main faces 2c, 2d face each other is a second direction D2. The facing direction in which the pair of side faces 2e, 2f face each other is a third direction D3.

[0018] In this embodiment, the first direction D1 is the longitudinal direction of the element body 2. The second direction D2 is the height direction of the element body 2 and is perpendicular to the second direction D2. 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.

[0019] The pair of end faces 2a, 2b extend in the second direction D2 to connect the pair of principal faces 2c, 2d together. The pair of end faces 2a, 2b also extend in the third direction D3 (the direction of the short sides of the pair of principal faces 2c, 2d). The pair of side faces 2e, 2f extend in the second direction D2 to connect the pair of principal faces 2c, 2d together. The pair of side faces 2e, 2f also extend in the first direction D1 (the direction of the long sides of the pair of end faces 2a, 2b). The principal face 2d can be defined as a mounting surface that faces another electronic device (for example, a circuit board or a filter) when the filter 1 is mounted on the other electronic device.

[0020] The element body 2 is constructed by laminating multiple dielectric layers 8 (see FIG. 6). Each dielectric layer is laminated in the second direction D2. That is, the second direction D2 is the lamination direction. The element body 2 has multiple laminated dielectric layers. Each dielectric layer 8 is constructed, for example, from a sintered ceramic green sheet containing a dielectric material (dielectric ceramic such as BaTiO3-based, Ba(Ti,Zr)O3-based, or (Ba,Ca)TiO3-based). In an actual element body 2, the multiple dielectric layers 8 are integrated to the extent that the boundaries between the layers are not visible.

[0021] The first terminal electrode 3 is arranged on the end surface 2a side of the element body 2. The first terminal electrode 3 is arranged in the center of the end surface 2a in the third direction D3. The first terminal electrode 3 is formed so as to cover part of the end surface 2a along the second direction D2 of the element body 2, and is also formed on part of the main surface 2c and part of the main surface 2d. The first terminal electrode 3 has a first portion 3a, a second portion 3b, and a third portion 3c. The first portion 3a, the second portion 3b, and the third portion 3c are integrally formed. The first portion 3a is arranged on the main surface 2c. The second portion 3b is arranged on the main surface 2d. The third portion 3c is arranged on the end surface 2a. The third portion 3c extends along the second direction D2 and electrically connects the first portion 3a and the second portion 3b.

[0022] The second terminal electrode 4 is arranged on the end face 2b side of the element body 2. The second terminal electrode 4 is arranged in the center of the end face 2b in the third direction D3. The second terminal electrode 4 is formed so as to cover part of the end face 2b along the second direction D2 of the element body 2, and is also formed on part of the main face 2c and part of the main face 2d. The second terminal electrode 4 has a first portion 4a, a second portion 4b, and a third portion 4c. The first portion 4a, the second portion 4b, and the third portion 4c are integrally formed. The first portion 4a is arranged on the main face 2c. The second portion 4b is arranged on the main face 2d. The third portion 4c is arranged on the end face 2b. The third portion 4c extends along the second direction D2 and electrically connects the first portion 4a and the second portion 4b.

[0023] The third terminal electrode 5 is arranged on the side surface 2e side of the element body 2. The third terminal electrode 5 is formed so as to cover part of the side surface 2e along the second direction D2 of the element body 2, and is also formed on part of the main surface 2c and part of the main surface 2d. The third terminal electrode 5 has a first portion 5a, a second portion 5b, and a third portion 5c. The first portion 5a, the second portion 5b, and the third portion 5c are integrally formed. The first portion 5a is arranged on the main surface 2c. The first portion 5a extends along the first direction D1. The second portion 5b is arranged on the main surface 2d. The second portion 5b extends along the first direction D1. The third portion 5c is arranged on the side surface 2e. The third portion 5c extends along the second direction D2 and electrically connects the first portion 5a and the second portion 5b.

[0024] The fourth terminal electrode 6 is arranged on the side surface 2f of the element body 2. The fourth terminal electrode 6 is formed so as to cover part of the side surface 2f along the second direction D2 of the element body 2, and is also formed on part of the main surface 2c and part of the main surface 2d. The fourth terminal electrode 6 has a first portion 6a, a second portion 6b, and a third portion 6c. The first portion 6a, the second portion 6b, and the third portion 6c are integrally formed. The first portion 6a is arranged on the main surface 2c. The first portion 6a extends along the first direction D1. The second portion 6b is arranged on the main surface 2d. The second portion 6b extends along the first direction D1. The third portion 6c is arranged on the side surface 2f. The third portion 6c extends along the second direction D2 and electrically connects the first portion 6a and the second portion 6b.

[0025] The first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, and the fourth terminal electrode 6 contain a conductive material (for example, Ag or Pd). The first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, and the fourth terminal electrode 6 are configured as a sintered body of a conductive paste containing a conductive material (for example, Ag powder or Pd powder). A plating layer may be formed on the surface of the first terminal electrode 3, the second terminal electrode 4, the third terminal electrode 5, and the fourth terminal electrode 6. The plating layer is formed by, for example, electroplating. The plating layer has a layer structure consisting of a Cu plating layer, a Ni plating layer, and a Sn plating layer, or a layer structure consisting of a Ni plating layer and a Sn plating layer.

[0026] The first terminal electrode 3 constitutes an input terminal (a terminal to which a signal is input). The second terminal electrode 4 constitutes an output terminal (a terminal from which a signal is output). The third terminal electrode 5 constitutes a ground terminal (a terminal connected to ground). The fourth terminal electrode 6 constitutes a ground terminal.

[0027] 6 is an exploded perspective view of the filter 1. As shown in FIGS. 1 to 6, the filter section 7 includes a first inductor conductor 10, a second inductor conductor 11, a third inductor conductor 12, a fourth inductor conductor 13, a connecting conductor (first connecting conductor) 14, a connecting conductor (first connecting conductor) 15, a connecting conductor (first connecting conductor) 16, a connecting conductor (first connecting conductor) 17, a connecting conductor (first connecting conductor) 18, a connecting conductor (first connecting conductor) 19, a connecting conductor (second connecting conductor) 20, a connecting conductor (second connecting conductor) 21, a connecting conductor (second connecting conductor) 22, a connecting conductor (second connecting conductor) 23, and a connecting conductor (second connecting conductor). The capacitor conductor 20 includes a connecting conductor (second connecting conductor) 24, a connecting conductor (second connecting conductor) 25, a first ground conductor 26, a second ground conductor 27, a connecting conductor 28, a capacitor conductor 29, a capacitor conductor 30, a capacitor conductor 31, a capacitor conductor 32, a capacitor conductor 33, a capacitor conductor 34, a capacitor conductor 35, a capacitor conductor 36, a capacitor conductor 37, a capacitor conductor 38, a connecting conductor 39, a connecting conductor 40, a capacitor conductor 41, a capacitor conductor 42, a connecting conductor 43, and a connecting conductor 44.

[0028] Each conductor may include a conductive material (e.g., Ag or Pd), and may be configured as a sintered body of a conductive paste containing a conductive material (e.g., Ag powder or Pd powder).

[0029] The first inductor conductor 10 extends along the second direction D2. The first inductor conductor 10 may be composed of a plurality of via conductors B1. The first inductor conductor 10 is arranged in a central position in the third direction D3 and closer to the end face 2a in the first direction D1. The first inductor conductor 10 electrically connects the first ground conductor 26 to the capacitor conductor 32 and the capacitor conductor 35. One end of the first inductor conductor 10 (the end on the principal surface 2c side) is connected to the first ground conductor 26. The other end of the first inductor conductor 10 (the end on the principal surface 2d side) is connected to the capacitor conductor 32 and the capacitor conductor 35.

[0030] The second inductor conductor 11 extends along the second direction D2. The second inductor conductor 11 may be composed of a plurality of via conductors B2. The second inductor conductor 11 is disposed closer to the side surface 2f than the first inductor conductor 10 in the third direction D3. The second inductor conductor 11 is disposed closer to the center than the first inductor conductor 10 in the first direction D1. The second inductor conductor 11 electrically connects the first ground conductor 26 to the capacitor conductor 30 and the capacitor conductor 37. One end of the second inductor conductor 11 (the end on the principal surface 2c side) is connected to the first ground conductor 26. The other end of the second inductor conductor 11 (the end on the principal surface 2d side) is connected to the capacitor conductor 30 and the capacitor conductor 37.

[0031] The third inductor conductor 12 extends along the second direction D2. The third inductor conductor 12 may be composed of a plurality of via conductors B3. The third inductor conductor 12 is arranged in a central position in the third direction D3 and closer to the end face 2b in the first direction D1. The third inductor conductor 12 electrically connects the first ground conductor 26 to the capacitor conductor 33 and the capacitor conductor 36. One end of the third inductor conductor 12 (the end on the principal surface 2c side) is connected to the first ground conductor 26. The other end of the third inductor conductor 12 (the end on the principal surface 2d side) is connected to the capacitor conductor 33 and the capacitor conductor 36.

[0032] The fourth inductor conductor 13 extends along the second direction D2. The fourth inductor conductor 13 may be composed of a plurality of via conductors B4. The fourth inductor conductor 13 is disposed closer to the side surface 2f than the third inductor conductor 12 in the third direction D3. The fourth inductor conductor 13 is disposed closer to the center than the third inductor conductor 12 in the first direction D1. The fourth inductor conductor 13 electrically connects the first ground conductor 26 to the capacitor conductor 31 and the capacitor conductor 38. One end of the fourth inductor conductor 13 (the end on the principal surface 2c side) is connected to the first ground conductor 26. The other end of the fourth inductor conductor 13 (the end on the principal surface 2d side) is connected to the capacitor conductor 31 and the capacitor conductor 38.

[0033] The connecting conductor 14 electrically connects the first portion 5a of the third terminal electrode 5 and the first ground conductor 26. The connecting conductor 14 may be formed of a through-hole conductor T1. The connecting conductor 14 is disposed at a position closer to the end face 2a in the first direction D1.

[0034] The connection conductor 15 electrically connects the first portion 5a of the third terminal electrode 5 and the first ground conductor 26. The connection conductor 15 may be formed by a through-hole conductor T2. The connection conductor 15 is disposed at a central position in the first direction D1.

[0035] The connection conductor 16 electrically connects the first portion 5a of the third terminal electrode 5 and the first ground conductor 26. The connection conductor 16 may be formed of a through-hole conductor T3. The connection conductor 14 is disposed closer to the end face 2b in the first direction D1. The connection conductors 14, 15, and 16 are disposed at predetermined intervals in the first direction D1.

[0036] The connecting conductor 17 electrically connects the first portion 6a of the fourth terminal electrode 6 and the first ground conductor 26. The connecting conductor 17 may be formed of a through-hole conductor T4. The connecting conductor 17 is disposed closer to the end face 2a in the first direction D1.

[0037] The connection conductor 18 electrically connects the first portion 6a of the fourth terminal electrode 6 and the first ground conductor 26. The connection conductor 18 may be formed by a through-hole conductor T5. The connection conductor 18 is disposed at a central position in the first direction D1.

[0038] The connection conductor 19 electrically connects the first portion 6a of the fourth terminal electrode 6 and the first ground conductor 26. The connection conductor 19 may be formed of a through-hole conductor T6. The connection conductor 19 is disposed closer to the end face 2b in the first direction D1. The connection conductors 17, 18, and 19 are disposed at a predetermined interval in the first direction D1.

[0039] The connecting conductor 20 electrically connects the second portion 5b of the third terminal electrode 5 and the second ground conductor 27. The connecting conductor 20 may be formed of a through-hole conductor T7. The connecting conductor 20 is disposed at a position closer to the end face 2a in the first direction D1.

[0040] The connecting conductor 21 electrically connects the second portion 5b of the third terminal electrode 5 and the second ground conductor 27. The connecting conductor 21 may be formed by a through-hole conductor T8. The connecting conductor 21 is disposed at a central position in the first direction D1.

[0041] The connection conductor 22 electrically connects the second portion 5b of the third terminal electrode 5 and the second ground conductor 27. The connection conductor 22 may be formed of a through-hole conductor T9. The connection conductor 22 is disposed closer to the end face 2b in the first direction D1. The connection conductors 20, 21, and 22 are disposed at a predetermined interval in the first direction D1.

[0042] The connecting conductor 23 electrically connects the second portion 6b of the fourth terminal electrode 6 and the second ground conductor 27. The connecting conductor 23 may be formed of a through-hole conductor T10. The connecting conductor 23 is disposed at a position closer to the end face 2a in the first direction D1.

[0043] The connecting conductor 24 electrically connects the second portion 6b of the fourth terminal electrode 6 and the second ground conductor 27. The connecting conductor 24 may be formed by a through-hole conductor T11. The connecting conductor 24 is disposed at a central position in the first direction D1.

[0044] The connection conductor 25 electrically connects the second portion 6b of the fourth terminal electrode 6 and the second ground conductor 27. The connection conductor 25 may be formed of a through-hole conductor T12. The connection conductor 25 is disposed closer to the end face 2b in the first direction D1. The connection conductors 23, 24, and 25 are disposed at a predetermined interval in the first direction D1.

[0045] The connecting conductors 14 to 25 have a circular shape when viewed in the second direction D2. The connecting conductors 14 to 25 extend in a cylindrical shape in the second direction D2.

[0046] The first ground conductor 26 is disposed at a position closer to the principal surface 2c. The first ground conductor 26 is electrically connected to the third terminal electrode 5 (first portion 5a) by the connection conductors 14, 15, and 16. The first ground conductor 26 is electrically connected to the fourth terminal electrode 6 (first portion 6a) by the connection conductors 17, 18, and 19.

[0047] The second ground conductor 27 is disposed at a position closer to the principal surface 2d. The second ground conductor 27 is electrically connected to the third terminal electrode 5 (second portion 5b) by connecting conductors 20, 21, and 22. The second ground conductor 27 is electrically connected to the fourth terminal electrode 6 (second portion 6b) by connecting conductors 23, 24, and 25.

[0048] The connecting conductor 28 electrically connects the second inductor conductor 11 and the fourth inductor conductor 13. The capacitor conductor 29 is disposed in a position facing the capacitor conductor 30 and the capacitor conductor 31. The capacitor conductor 30 is connected to the second inductor conductor 11. The capacitor conductor 31 is connected to the fourth inductor conductor 13.

[0049] The capacitor conductor 32 is connected to the first inductor conductor 10. The capacitor conductor 33 is connected to the third inductor conductor 12. The capacitor conductor 34 is disposed in a position facing the capacitor conductors 32 and 33. The capacitor conductor 35 is connected to the first inductor conductor 10. The capacitor conductor 36 is connected to the third inductor conductor 12. The capacitor conductor 37 is connected to the second inductor conductor 11. The capacitor conductor 38 is connected to the fourth inductor conductor 13.

[0050] The connecting conductor 39 is electrically connected to the capacitor conductor 35. The connecting conductor 39 is exposed at the end face 2 a and connected to the first terminal electrode 3. The connecting conductor 40 is electrically connected to the capacitor conductor 36. The connecting conductor 40 is exposed at the end face 2 b and connected to the second terminal electrode 4.

[0051] The capacitor conductor 41 is electrically connected to the capacitor conductor 37. The capacitor conductor 41 is disposed opposite the second ground conductor 27. The capacitor conductor 42 is electrically connected to the capacitor conductor 38. The capacitor conductor 42 is disposed opposite the second ground conductor 27.

[0052] Fig. 7 is a transparent perspective view of the filter shown in Fig. 1. The filter 1 shown in Fig. 7 shows a pad 45 and a pad 46. The pad 45 and the pad 46 contain a conductive material (for example, Ag or Pd).

[0053] The pad 45 is disposed between the third terminal electrode 5 and the main surface 2c of the element body 2. The pad 45 is provided so as to cover the connecting conductors 14 to 16. The connecting conductors 14 to 16 are connected to the third terminal electrode 5 via the pad 45. In the actual filter 1, the pad 45 is integrated with the third terminal electrode 5 by firing to the extent that the boundary between the pad 45 and the third terminal electrode 5 is not visible.

[0054] The pad 46 is disposed between the fourth terminal electrode 6 and the main surface 2c of the element body 2. The pads 45 and 46 are formed on the dielectric layer 8. The pad 46 is provided so as to cover the connecting conductors 17 to 19. The connecting conductors 17 to 19 are connected to the fourth terminal electrode 6 via the pad 46. In the actual filter 1, the pad 46 is integrated with the fourth terminal electrode 6 by firing to such an extent that the boundary between the pad 46 and the fourth terminal electrode 6 is not visible.

[0055] Fig. 8 is an equivalent circuit diagram of the filter 1 shown in Fig. 1. As shown in Fig. 8, the filter 1 includes an input port P1, an output port P2, a ground Gnd1, a ground Gnd2, a ground Gnd3, a ground Gnd4, a ground Gnd5, an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, and a capacitor C9.

[0056] The input port P1 is formed by a first terminal electrode 3. The output port P2 is formed by a second terminal electrode 4. The grounds Gnd1, Gnd2, Gnd3, Gnd4, and Gnd5 are formed by a third terminal electrode 5 and a fourth terminal electrode 6.

[0057] The inductor L1 is formed by a first inductor conductor 10. The inductor L2 is formed by a second inductor conductor 11. The inductor L3 is formed by a third inductor conductor 12. The inductor L4 is formed by a fourth inductor conductor 13.

[0058] The capacitor C1 is formed by the second ground conductor 27 and a capacitor conductor 35. The capacitor C2 is formed by the second ground conductor 27 and a capacitor conductor 41. The capacitor C3 is formed by the second ground conductor 27 and a capacitor conductor 36. The capacitor C4 is formed by the second ground conductor 27 and a capacitor conductor 42.

[0059] The capacitor C5 is composed of a capacitor conductor 30 and a capacitor conductor 32. The capacitor C6 is composed of a capacitor conductor 29, a capacitor conductor 30, and a capacitor conductor 31. The capacitor C7 is composed of a capacitor conductor 31 and a capacitor conductor 33.

[0060] The capacitor C8 is composed of a capacitor conductor 34 and a capacitor conductor 35. The capacitor C9 is composed of a capacitor conductor 34 and a capacitor conductor 36.

[0061] As described above, in filter 1 according to this embodiment, connecting conductors 14 to 25 have a circular shape, which can uniformly distribute stress on each of connecting conductors 14 to 25. This can prevent gaps from forming between element body 2 and connecting conductors 14 to 25 in filter 1. This can prevent foreign matter from entering element body 2 in filter 1, thereby preventing a decrease in reliability.

[0062] In the filter 1 according to this embodiment, the third terminal electrode 5 is formed to cover a portion of the side surface 2e along the second direction D2 of the element body 2, and is also formed on a portion of the principal surface 2c and a portion of the principal surface 2d. In this configuration, the third terminal electrode 5 is disposed across the principal surface 2c, the side surface 2e, and the principal surface 2d. This configuration allows for more effective stress dispersion than, for example, a configuration in which the terminal electrode is disposed only on the principal surface 2d (mounting surface) (bottom surface terminal). Therefore, in the filter 1, stress applied to the connecting conductors 14-16 and the connecting conductors 20-22 connected to the third terminal electrode 5 can be dispersed, thereby preventing gaps from forming between the element body 2 and the connecting conductors 14-16 and the connecting conductors 20-22. Therefore, in the filter 1, foreign matter is prevented from entering the element body 2, preventing a decrease in reliability. The same applies to the fourth terminal electrode 6.

[0063] In the filter 1 according to this embodiment, the third terminal electrode 5 is connected to the first ground conductor 26 and the second ground conductor 27 by the connecting conductors 14-16 and the connecting conductors 20-22. By connecting the third terminal electrode 5 to the first ground conductor 26 and the second ground conductor 27 on the principal surfaces 2c and 2d in this manner, the risk of peeling off of the dielectric layer 8 is reduced. In particular, in a configuration in which the terminal electrodes and the ground conductors are connected by multiple connecting conductors (connection portions, lead-out portions) exposed on the side surfaces 2e and 2f, the risk of peeling off from the interface between the element body and the connecting conductors may be increased. In contrast, in the filter 1, the third terminal electrode 5 is connected to the first ground conductor 26 and the second ground conductor 27 on the principal surfaces 2c and 2d, which reduces the risk of peeling off of the dielectric layer 8.

[0064] In the filter 1 according to this embodiment, the third terminal electrode 5 is electrically connected to the first ground conductor 26 by a plurality of connecting conductors 14 to 16, and is electrically connected to the second ground conductor 27 by a plurality of connecting conductors 20 to 22. Therefore, in the filter 1, there are multiple paths connecting the third terminal electrode 5 to the first ground conductor 26 and the second ground conductor 27, thereby strengthening the ground. Also, in the filter 1, the fourth terminal electrode 6 is electrically connected to the first ground conductor 26 by a plurality of connecting conductors 17 to 19, and is electrically connected to the second ground conductor 27 by a plurality of connecting conductors 23 to 25. Therefore, in the filter 1, there are multiple paths connecting the fourth terminal electrode 6 to the first ground conductor 26 and the second ground conductor 27, thereby strengthening the ground.

[0065] In the filter 1 according to this embodiment, the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13 extend in the second direction D2. In this configuration, the capacitor conductor 30, the capacitor conductor 31, the capacitor conductor 32, and the capacitor conductor 33 are suspended from the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13. This creates space around the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13 in the filter 1, ensuring an area where magnetic flux is generated around the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13, and forming a magnetic field around the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13. This allows the apparent volume of the inductors in the filter 1 to be increased. As a result, the Q value of the filter can be improved.

[0066] In the filter 1 according to this embodiment, pads 45 and 46 are provided before firing. Pad 45 is provided so as to cover the connecting conductors 14 to 16. Pad 46 is provided so as to cover the connecting conductors 17 to 19. With this configuration, it is possible to prevent foreign matter from entering the element body 2 through the connecting conductors 14 to 19 in the process before firing.

[0067] Although the embodiments of the present disclosure have been described above, the present disclosure is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure.

[0068] In the above embodiment, the first portion 5a of the third terminal electrode 5 and the first ground conductor 26 are connected to each other by three connecting conductors, namely, connecting conductor 14, connecting conductor 15, and connecting conductor 16. However, the first portion 5a of the third terminal electrode 5 and the first ground conductor 26 may be connected to each other by one or two connecting conductors, or by four or more connecting conductors. The same applies to the connecting conductors 17 to 25.

[0069] In the above embodiment, the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13 are described as extending linearly along the second direction D2 as an example. However, the first inductor conductor 10, the second inductor conductor 11, the third inductor conductor 12, and the fourth inductor conductor 13 are not limited to extending linearly, and various other configurations may be adopted. [Explanation of symbols]

[0070] 1...filter, 2...element body, 2c...main surface, 2d...main surface (mounting surface), 2e, 2f...side surface, 5...third terminal electrode, 5a...first portion, 5b...second portion, 5c...third portion, 6...fourth terminal electrode, 6a...first portion, 6b...second portion, 6c...third portion, 10...first inductor conductor, 11...second inductor conductor, 12...third inductor conductor, 13...fourth inductor conductor, 26...first ground conductor, 27...second ground conductor, 30, 31, 32, 33...capacitor conductors.

Claims

1. an element body having a mounting surface and a main surface facing each other, and four side surfaces connecting the mounting surface and the main surface; a terminal electrode disposed on at least one of the four side surfaces, the terminal electrode being disposed across the mounting surface, the side surface, and the main surface; a first ground conductor disposed in the element body near the main surface; a second ground conductor disposed in the element body at a position closer to the mounting surface; an inductor conductor and a capacitor conductor disposed within the element body; the terminal electrode has a first portion disposed on the main surface, a second portion disposed on the mounting surface, and a third portion disposed on the side surface and connecting the first portion and the second portion, the first ground conductor and the first portion of the terminal electrode are electrically connected by a first connecting conductor; the second ground conductor and the second portion of the terminal electrode are electrically connected by a second connecting conductor; The filter, wherein the first connecting conductor and the second connecting conductor each have a circular shape when viewed from a direction in which the mounting surface and the main surface face each other.

2. The filter according to claim 1 , wherein at least one of the first connecting conductor and the second connecting conductor is provided in plurality.

3. one end of the inductor conductor is electrically connected to the first ground conductor; The filter according to claim 1 , wherein the other end of the inductor conductor is electrically connected to the capacitor conductor.

4. The filter according to claim 3 , wherein the second ground conductor and the capacitor conductor are disposed opposite each other in an opposing direction between the mounting surface and the main surface, and form a capacitor.

5. The filter according to claim 3 , wherein the inductor conductor extends in a direction in which the mounting surface and the main surface oppose each other.

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