TW201711381A - Multilayer lc filter - Google Patents

Abstract

Provided is a multilayer LC filter capable of increasing an inductance value of an inductor of an LC parallel resonator. The multilayer LC filter is provided with: a layered product 1 in which insulator layers 1a to 1o are stacked; line electrodes 4a to 4j; capacitor electrodes 5a to 5e; via electrodes 8a to 8w; a first input-output terminal 2a; a second input-output terminal 2b; and ground terminals 3a and 3b. A first LC parallel resonator and a second parallel resonator are inserted in serial between the first input-output terminal 2a and the second input-output terminal 2b, and the line electrodes 4d, 4f, and 4h forming a first inductor of the first LC parallel resonator and the line electrodes 4c, 4e, and 4g forming a second inductor of the second LC parallel resonator are formed between layers of the layered product 1 different from each other.

Description

Multilayer LC filter

The present invention relates to a laminated LC filter, and more particularly to a laminated LC filter capable of increasing the inductance of an inductor of an LC parallel resonator.

The laminated LC filter is used for signal filtering in electronic equipment. The laminated LC filter is formed of an inductor or a capacitor by a line electrode, a via electrode, a capacitor electrode or the like in a laminate in which an insulator layer is laminated, and has a structure suitable for small size and light weight.

The above-described laminated LC filter (layered filter) is disclosed in Japanese Laid-Open Patent Publication No. 2011-61760.

The laminated LC filter 1100 disclosed in Patent Document 1 is shown in Fig. 12, Fig. 13, and Fig. 14, respectively. 12 is an exploded perspective view of the laminated LC filter 1100. FIG. 13 is a perspective view of a laminated LC filter 1100. FIG. 14 is an equivalent circuit diagram of the laminated LC filter 1100.

As shown in FIG. 12, the laminated LC filter 1100 includes a laminated body 101 composed of four insulating layers 101a to 101d.

The insulator layer 101a is a protective layer, and electrodes are not formed on the main surface.

On one main surface of the insulator layer 101b, two line electrodes 102a and 102b and two capacitor electrodes 103a and 103b are formed.

On one main surface of the insulator layer 101c, two line electrodes 102c, 102d are formed. And a capacitor electrode 103c. Further, in the insulator layer 101c, via electrodes 104a and 104b are formed to penetrate between the main surfaces. Further, the line electrode 102a and the line electrode 102c are connected by the via electrode 104a, and the line electrode 102b and the line electrode 102d are connected by the via electrode 104b.

As shown in FIG. 13, a pair of input/output terminals (external electrodes) 105a and 105b and two ground terminals (external ground electrodes) 106a and 106b are formed on the surface of the laminated body 101.

Further, the line electrode 102a and the capacitor electrode 103a are connected to the input/output terminal 105a, and the line electrode 102b and the capacitor electrode 103b are connected to the input/output terminal 105b.

Further, the line electrode 102c and the line electrode 102d are connected to the ground terminal 106a, and the capacitor electrode 103c is connected to the ground terminal 106b.

As a result, the laminated LC filter 1100 includes the equivalent circuit shown in FIG. Specifically, the inductor L1 formed by the line electrode 102a and the line electrode 102c and the first LC parallel resonator Re1 in which the capacitor electrode 103a and the capacitor C1 formed by the capacitor electrode 103c are connected in parallel are inserted into the input/output terminal 105a. Between the ground terminals 106a, 106b. Further, the inductor L2 formed by the line electrode 102b and the line electrode 102d and the second LC parallel resonator Re2 formed by connecting the capacitor electrode 103b and the capacitor C2 formed by the capacitor electrode 103c in parallel are inserted into the input/output terminal 105b and the ground. Between the terminals 106a, 106b. Further, a capacitor C3 formed of the capacitor electrode 103a and the capacitor electrode 103b is inserted between the input/output terminal 105a and the input/output terminal 105b. Further, the inductor L1 of the first LC parallel resonator Re1 and the inductor L2 of the second LC parallel resonator Re2 are magnetically coupled as indicated by the symbol M.

In addition, a filter having a strip line formed on both main faces of a dielectric substrate is disclosed in Patent Document 2 (Japanese Laid-Open Patent Publication No. Hei No. 5-140006). Line filter) 1200. A filter 1200 disclosed in Patent Document 2 is shown in Figs. 15(A) and (B). 15(A) is a plan view of the filter 1200, and FIG. 15(B) is a bottom view of the filter 1200.

The filter 1200 is attached to one main surface of the dielectric substrate 201, and a strip line 202a and a strip line 202b are formed to face each other. Further, on the other main surface of the dielectric substrate 201, a strip line 202c and a strip line 202d are formed to face each other. Further, the strip line 202a and the strip line 202c are connected by a through hole 204a formed through the dielectric substrate 201. Similarly, the strip line 202b and the strip line 202d are connected by a through hole 204b formed through the dielectric substrate 201.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-61760

[Patent Document 2] Japanese Patent Laid-Open No. Hei 5-14006

Recently, electronic devices such as mobile phones and mobile phones such as smart phones and mobile phones have been further reduced in size and weight in electronic devices such as digital cameras and video cameras. Along with this, further reduction in size and weight is required for electronic components used in electronic equipment.

Further, the range of frequencies used in electronic equipment has been increasing year by year, from tens of MHz on the low frequency side to around 5 GHz on the high frequency side. The result of this is that the laminated LC In the filter, it is necessary to further reduce the size and weight, and to match the product group corresponding to the wide frequency of the low frequency to the high frequency.

In addition, in the laminated LC filter, if the pattern of the line electrode of the inductor of the LC parallel resonator is increased without increasing the size of the laminated body, and the inductance value is increased, the size and lightness are reduced for the following reasons. Various aspects such as quantification, enhancement of features, and diversification of product groups are beneficial.

First, in the laminated LC filter, as long as the inductance value of the inductor of the LC parallel resonator can be increased, the capacitance value of the capacitor of the LC parallel resonator or the insertion between the signal line and the ground can be reduced correspondingly. The capacitance value of the capacitor used for the branch pipe can obtain the same characteristics even if the capacitance value of the capacitor is reduced. Further, as long as the capacitance value of the capacitor can be reduced, the area of the capacitor electrode can be reduced, and the size of the layered body in the planar direction can be reduced, whereby the size and weight of the laminated LC filter can be reduced.

Moreover, as long as the inductance value of the inductor of the LC parallel resonator can be increased, the Q (quality factor) of the inductor is improved. Further, as long as the Q of the inductor is increased, the characteristics of the laminated LC filter such as the reduction in insertion loss can be improved.

Further, as long as the pattern of the line electrode of the inductor of the LC parallel resonator can be increased and the pattern is made close to a square, the inductance Q increases and the Q of the inductor increases. Further, as described above, as long as the Q of the inductor is increased, the characteristics of the LC-type filter such as the reduction in insertion loss can be improved.

Moreover, as long as the inductance value of the inductor of the LC parallel resonator can be increased, the magnetic coupling between the inductors of the adjacent LC parallel resonator can be enhanced, and the characteristic adjustment of the laminated LC filter can be performed, thereby enabling Product group of laminated LC filters with various frequency characteristics Consistent.

Further, in particular, in the case of fabricating a laminated LC filter corresponding to a low frequency, it is necessary to increase the inductance value of the inductor of the LC parallel resonator. However, it is necessary to avoid increasing the size of the laminate. It is also important to increase the size of the laminated body to increase the pattern of the line electrode of the inductor of the LC parallel resonator and increase the inductance value in the case of fabricating a laminated LC filter corresponding to a low frequency.

As described above, in the laminated LC filter, it is desirable to increase the pattern of the line electrode of the inductor of the LC parallel resonator and increase the inductance value, but in the conventional LC type filter, it is difficult to increase the line electrode of the inductor. The pattern and increase the inductance value.

For example, in the multilayer LC filter 1100 disclosed in Patent Document 1, even if the inductance value of the inductor L1 or the inductor L2 shown in the equivalent circuit of FIG. 14 is increased, as shown in FIG. 12, the laminated body 101 is as shown in FIG. The patterns of the line electrodes 102a, 102b, 102c, and 102d are formed to the maximum extent, and the line electrodes 102a, the line electrodes 102b, the line electrodes 102c, and the line electrodes 102d are formed close to each other. Therefore, it is difficult for the laminated LC filter 1100 to further increase the pattern of the line electrodes 102a, 102b, 102c, and 102d, and to increase the inductance values of the inductor L1 and the inductor L2. Further, in the multilayer LC filter 1100, it is also difficult to bring the line electrode 102a, the line electrode 102b, and the line electrode 102c closer to the line electrode 102d, and to enhance the magnetic coupling between the inductor L1 and the inductor L2.

In the filter 1200 disclosed in Patent Document 2, the strip lines 202a, 202b, 202c, and 202d are respectively formed to the maximum extent, and the strip line 202a is close to the strip line 102b and the strip line 202c and the strip line 202d. Ground formation. Therefore, in the filter 1200, it is difficult to further increase the strip lines 202a, 202b, 202c, and 202d and increase the inductance value. Moreover, in the filter 1200, It is also difficult to bring the strip line 202a closer to the strip line 102b, the strip line 202c, and the strip line 202d, and to enhance the magnetic coupling between the strip lines.

Further, in the laminated LC filter, in order to increase the inductance value of the inductor of the LC parallel resonator, there is a method of increasing the number of layers of the insulator layer constituting the laminated body and increasing the number of turns of the inductor, but the method is due to the laminated body. It is large in size and heavy in weight and is not good.

The present invention has been made in order to solve the above-mentioned conventional problems, and the laminated LC filter of the present invention has a laminated body in which a plurality of insulator layers are laminated, and a plurality of line electrodes are formed in a plurality of constituent layers. Between the layers of the insulator layer; a plurality of capacitor electrodes formed between the layers of the plurality of insulator layers constituting the laminate; a plurality of via electrodes are formed between the two main faces of the insulator layer; the first input/output terminal and the second input/output a terminal formed on a surface of the laminated body; and at least one ground terminal, wherein at least a first LC parallel resonator and a second LC parallel resonator are inserted between the first input/output terminal and the second input/output terminal, and the first LC parallel resonator The first inductor and the first capacitor are connected in parallel, and the second LC parallel resonator is connected in parallel with the second inductor and the second capacitor, and the first inductor and the second inductor are respectively plural. The line electrodes and the at least one via electrode are connected in a predetermined order, and the first capacitor and the second capacitor are formed using capacitor electrodes, respectively. One of a plurality of insulator layers constituting the laminated body is formed with a line electrode forming a first inductor, and a line electrode of the second inductor is not formed, and the other layer of the plurality of insulator layers constituting the laminated body is formed to form a layer 2 The line electrode of the inductor is not formed with the line electrode of the first inductor.

The first LC parallel resonator and the second LC parallel resonator may be connected in series between the first input/output terminal and the second input/output terminal.

Between the connection point of the first input/output terminal and the first LC parallel resonator and the ground terminal, between the connection point of the first LC parallel resonator and the second LC parallel resonator, and the ground terminal, the second LC parallel resonator and the second At least one of a connection point between the input/output terminal and the ground terminal connects the third capacitor or the third capacitor to the fourth capacitor or the third capacitor, the fourth capacitor, and the fifth capacitor to form a low-pass filter .

When the laminated body is seen in the laminated direction of the insulator layer, the line electrode forming the first inductor and the line electrode of the second inductor may partially overlap. In this case, since the first inductor and the second inductor are close to each other, the magnetic coupling between the first inductor and the second inductor can be enhanced. Further, the first inductor and the second inductor may be capacitively coupled.

When the laminated body is seen in the laminated direction of the insulating layer, the line electrode forming the first inductor and the line electrode forming the second inductor may overlap each other and intersect at two places. In this case, the length of the line electrode forming the first inductor and the length of the line electrode of the second inductor can be further increased, and the inductance value of the first inductor and the inductance of the second inductor can be further increased, respectively. value.

The line electrode forming the first inductor and the line electrode of the second inductor may be formed between the layers of the laminated body in a layered direction of the insulator layer. In this case, the balance between the magnetic coupling between the first inductor and the second inductor is improved, and the magnetic coupling can be enhanced.

Between the first input/output terminal and the second input/output terminal, in addition to the first LC parallel resonator and the second LC parallel resonator, one or a plurality of LC parallel resonators may be further connected in series. In this case, the frequency characteristics of the laminated LC filter can be made more excellent.

When the laminated body is seen in the direction of the lamination of the insulator layer, the direction of the current flowing through the line electrode forming the first inductor and the line flowing through the second inductor can be made. The direction of the pole current is opposite. In this case, the direction of the magnetic flux generated in the hollow core of the first inductor is opposite to the direction of the magnetic flux generated in the hollow core of the second inductor in the direction of the laminated layer of the insulator layer, thereby enhancing the first inductor and the first 2 magnetic coupling of the inductor.

In the multilayer LC filter of the present invention, the line electrode forming the first inductor and the line electrode forming the second inductor are formed between layers which are different from each other in the laminated body. Therefore, in the multilayer LC filter of the present invention, the line electrode forming the first inductor and the line electrode of the second inductor can be freely arranged in the planar direction without interfering with each other. As a result, the multilayer LC filter of the present invention can increase the pattern of the line electrode forming the first inductor, increase the length, and increase the inductance value of the first inductor. Similarly, the pattern of the line electrode forming the second inductor can be increased, the length can be increased, and the inductance value of the second inductor can be increased.

1‧‧ ‧ laminated body

1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1l, 1m, 1n, 1o‧‧‧ insulator layer

2a, 2b‧‧‧ input and output terminals

3a, 3b‧‧‧ grounding terminal

4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, 14c, 14d, 14e, 14f, 14g, 14h, 24a, 24b, 24c, 24d, 24e, 24f, 24g, 24h, 24i, 24j‧‧‧ line electrode

5a, 5b, 5c, 5d, 5e‧‧‧ capacitor electrodes

6a, 6b‧‧‧ grounding electrode

7a, 7b, 7c, 7d, 7e‧‧‧ connection electrodes

8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h, 8i, 8j, 8k, 8l, 8m, 8n, 8o, 8p, 8q, 8r, 8s, 8t, 8u, 8v, 8w, 18i, 18j, 18k, 18l, 18m, 18n, 18o, 18p, 18q, 18r, 18s, 18t, 18u, 18v, 18w‧‧‧ through-hole electrodes

100, 200, 300‧‧‧ laminated LC filters

Fig. 1 is an exploded perspective view showing the LC-type LC filter 100 of the first embodiment.

FIG. 2 is a perspective view showing the laminated LC filter 100.

Fig. 3(A) is a cross-sectional view showing the laminated LC filter 100. FIG. 3(B) is a plan view showing the insulator layer 1m of the laminated LC filter 100.

4 is an equivalent circuit diagram of the laminated LC filter 100.

Fig. 5 is an exploded perspective view showing a laminated LC filter 1300 of a comparative example.

Fig. 6(A) is a cross-sectional view showing the laminated LC filter 1300. Fig. 6(B) is a plan view showing the insulator layer 51j of the laminated LC filter 1300.

Fig. 7 is a layered type of the laminated LC filter 100 of the embodiment and a comparative example. A graph showing the frequency characteristics of the LC filter 1300 compared.

Fig. 8 is an exploded perspective view showing the multilayer LC filter 200 of the second embodiment.

FIG. 9 is a plan view showing the insulator layer 1m of the laminated LC filter 200.

FIG. 10 is an exploded perspective view showing the LC-type LC filter 300 of the third embodiment.

Fig. 11 is a plan view showing the insulator layer 11 of the laminated LC filter 300.

FIG. 12 is an exploded perspective view showing the laminated LC filter 1100 disclosed in Patent Document 1.

FIG. 13 is a perspective view showing a laminated LC filter 1100.

FIG. 14 is an equivalent circuit diagram of the laminated LC filter 1100.

Fig. 15(A) is a plan view showing the filter 1200 disclosed in Patent Document 2. Fig. 15(B) is a bottom view showing the filter 1200.

Hereinafter, the drawings and the modes for carrying out the invention will be described.

In addition, each embodiment exemplarily shows an embodiment of the present invention, and the present invention is not limited to the embodiment. Further, the contents described in the different embodiments may be combined and implemented, and the implementation contents in this case are also included in the present invention. Moreover, the drawings are not necessarily strictly depicted in order to assist the understanding of the embodiment. For example, the ratio of the dimensions of the constituent elements or constituent elements depicted may not match the ratio of the dimensions described in the specification. Further, the constituent elements described in the specification may be omitted or omitted in the drawings, and may be drawn.

[First Embodiment]

The laminated LC filter 100 according to the first embodiment of the present invention is shown in Fig. 1 to Fig. 4 .

1 is an exploded perspective view of the laminated LC filter 100. Figure 2 is A perspective view of the laminated LC filter 100. 3(A) is a cross-sectional view of the laminated LC filter 100. FIG. 3(B) is a plan view showing the insulator layer 1m described later in the multilayer LC filter 100. 4 is an equivalent circuit diagram of the laminated LC filter 100.

In addition, in FIGS. 1 and 3 (A) and (B), illustration of a pair of input/output terminals 2a and 2b and two ground terminals 3a and 3b which will be described later is omitted. Moreover, Fig. 3(A) shows the X-X portion of Fig. 2. Further, Fig. 3(B) shows the line electrode 4h formed on the main surface on the upper side of the insulator layer 1m to be described later, and the line electrode 4g formed on the principal surface on the lower side of the insulator layer 1m is seen in perspective.

The laminated LC filter 100 shown in FIG. 1 includes, for example, a laminated body 1 in which 15 insulating layers 1a to 1o are laminated. The laminated body 1 is composed of a rectangular parallelepiped shape. For example, ceramics are used as the material of the laminate 1 (insulator layers 1a to 1p).

As shown in FIG. 2, a pair of input/output terminals 2a and 2b and two ground terminals 3a and 3b are formed on the surface of the laminated body 1. The input/output terminals 2a and 2b and the ground terminals 3a and 3b are mainly formed on the side surface of the laminated body 1, and one end portion is formed to extend on the main surface on the upper side of the laminated body 1, and the other end portion is formed on the lower surface of the laminated body 1 Extended to form. The input/output terminals 2a and 2b and the ground terminals 3a and 3b are made of, for example, Ag, Cu, or a metal containing a main component such as these alloys, and if necessary, a plating layer mainly composed of Ni, Sn, or Au, and a layer. Or a plurality of layers formed on the surface.

Hereinafter, the insulator layers 1a to 1o, the line electrodes 4a to 4j formed on the main surfaces, the capacitor electrodes 5a to 5e, the ground electrodes 6a and 6b, and the connection electrodes 7a to 7e will be described with reference to Figs. 1 to 3 . The via electrodes 8a to 8w formed by passing between the two main faces will be described.

A ground electrode 6a is formed on the main surface of the upper side of the insulator layer 1a. Further, the ground electrode 6a is connected to the ground terminal 3a and the ground terminal 3b.

A capacitor electrode 5a, a capacitor electrode 5b, and three connection electrodes 7a to 7c are formed on the main surface on the upper side of the insulator layer 1b. Further, three via electrodes 8a to 8c are formed to penetrate between the main faces of the insulator layer 1c. Further, the capacitor electrode 5a is connected to the input/output terminal 2a, and the capacitor electrode 5b is connected to the input/output terminal 2b. Further, the connection electrode 7a is connected to the via electrode 8a, the connection electrode 7b is connected to the via electrode 8b, and the connection electrode 7c is connected to the via electrode 8c. Further, the via electrodes 8a to 8c are connected to the ground electrode 6a, respectively.

A ground electrode 6b is formed on the main surface of the upper side of the insulator layer 1c. Further, three via electrodes 8d to 8f are formed between the two main faces of the insulator layer 1c. Further, the ground electrode 6b is connected to the ground terminal 3a and the ground terminal 3b. Further, the ground electrodes 6b are connected to the via electrodes 8d to 8f, respectively. Further, the via electrode 8d is connected to the connection electrode 7a, the via electrode 8e is connected to the connection electrode 7b, and the via electrode 8f is connected to the connection electrode 7c.

A capacitor electrode 5c is formed on the main surface of the upper side of the insulator layer 1d.

A capacitor electrode 5d, a capacitor electrode 5e, and a connection electrode 7d are formed on the main surface on the upper side of the insulator layer 1e. Further, a via electrode 8g is formed between the two main faces of the insulator layer 1e. Further, the capacitor electrode 5d is connected to the input/output terminal 2a, and the capacitor electrode 5e is connected to the input/output terminal 2b. Further, the connection electrode 7d is connected to the via electrode 8g. Further, the via electrode 8g is connected to the capacitor electrode 5c.

A connection electrode 7e is formed on the main surface of the upper side of the insulator layer 1f. Further, a via electrode 8h is formed to penetrate between the main faces of the insulator layer 1f. Further, the connection electrode 7e is connected to the via electrode 8h. Further, the via electrode 8h is connected to the connection electrode 7d.

A line electrode 4a and a line electrode 4b are formed on the main surface on the upper side of the insulator layer 1g. Further, a via electrode 8i is formed between the two main faces of the insulator layer 1g. And the line One end of the electrode 4a and one end of the line electrode 4b are connected to each other, and then connected to the via electrode 8i. Further, the via electrode 8i is connected to the connection electrode 7e.

A line electrode 4c is formed on the main surface on the upper side of the insulator layer 1h. Further, two via electrodes 8j and 8k are formed to penetrate between the main faces of the insulator layer 1h. Further, one end of the line electrode 4c is connected to the via electrode 8k. Further, the via electrode 8j is connected to the other end of the line electrode 4a, and the via electrode 8k is connected to the other end of the line electrode 4b.

A line electrode 4d is formed on the main surface on the upper side of the insulator layer 1i. Further, two via electrodes 8l and 8m are formed between the two main faces of the insulator layer 1i. Further, one end of the line electrode 4d is connected to the via electrode 81. Further, the via electrode 8l is connected to the via electrode 8j, and the via electrode 8m is connected to the other end of the line electrode 4c.

A line electrode 4e is formed on the main surface on the upper side of the insulator layer 1j. Further, two via electrodes 8n and 8o are formed between the two main faces of the insulator layer 1j. Further, one end of the line electrode 4e is connected to the via electrode 8o. Further, the via electrode 8n is connected to the other end of the line electrode 4d, and the via electrode 8o is connected to the via electrode 8m.

A line electrode 4f is formed on the main surface on the upper side of the insulator layer 1k. Further, two via electrodes 8p and 8q are formed to penetrate between the main faces of the insulator layer 1k. Further, one end of the line electrode 4f is connected to the via electrode 8p. Further, the via electrode 8p is connected to the via electrode 8n, and the via electrode 8q is connected to the other end of the line electrode 4e.

A line electrode 4g is formed on the main surface on the upper side of the insulator layer 11. Further, two via electrodes 8r and 8s are formed to penetrate between the main faces of the insulator layer 11l. Further, one end of the line electrode 4g is connected to the via electrode 8s. Further, the via electrode 8r is connected to the other end of the line electrode 4f, and the via electrode 8s is connected to the via electrode 8q.

A line electrode 4h is formed on the main surface on the upper side of the insulator layer 1m. Further, two via electrodes 8t and 8u are formed between the two main faces of the insulator layer 1m. Further, one end of the line electrode 4h is connected to the via electrode 8t. Further, the via electrode 8t is connected to the via electrode 8r, and the via electrode 8u is connected to the other end of the line electrode 4g.

A line electrode 4i and a line electrode 4j are formed on the main surface on the upper side of the insulator layer 1n. Further, two via electrodes 8v and 8w are formed between the two main faces of the insulator layer 1n. Further, one end of the line electrode 4i is connected to the through hole electrode 8v, and one end of the line electrode 4j is connected to the through hole electrode 8w. Further, the other end of the line electrode 4i is connected to the input/output terminal 2a, and the other end of the line electrode 4j is connected to the input/output terminal 2b. Further, the via electrode 8v is connected to the other end of the line electrode 4h, and the via electrode 8w is connected to the via electrode 8u.

The insulator layer 1o is a protective layer, and no electrode is formed.

As described above, in the materials of the line electrodes 4a to 4j, the capacitor electrodes 5a to 5e, the ground electrodes 6a and 6b, the connection electrodes 7a to 7e, and the via electrodes 8a to 8w, for example, Ag, Cu, or the alloys thereof are used as a main component. metal.

The multilayer LC filter 100 of the first embodiment which is formed by the above-described configuration can be manufactured by a general manufacturing method used for a laminated LC filter which is formed by using a laminate in which an insulator layer is laminated.

Fig. 4 shows an equivalent circuit of the multilayer LC filter 100 of the first embodiment.

In the multilayer LC filter 100, a first LC parallel resonator Re1 and a second LC parallel resonator Re2 are inserted in series between the input/output terminal 2a and the input/output terminal 2b.

The first LC parallel resonator Re1 includes a first inductor L1 and a first capacitor C1 connected in parallel.

The second LC parallel resonator Re2 includes a second inductor L2 and a second capacitor C2 connected in parallel.

Further, in the multilayer LC filter 100, the first inductor L1 of the first LC parallel resonator Re1 and the second inductor L2 of the second LC parallel resonator Re2 are magnetically coupled. Further, the first inductor L1 of the first LC parallel resonator Re1 and the second inductor L2 of the second LC parallel resonator Re2 are overlapped in the laminated body 1, and are also capacitively coupled.

A third capacitor C3 is inserted between the connection point of the input/output terminal 2a and the first LC parallel resonator Re1 and the ground terminals 3a and 3b.

A fourth capacitor C4 is inserted between the connection point of the first LC parallel resonator Re1 and the second LC parallel resonator Re2 and the ground terminals 3a and 3b.

A fifth capacitor C5 is inserted between the connection point of the second LC parallel resonator Re2 and the input/output terminal 2b and the ground terminals 3a and 3b.

The third capacitor C3 to the fifth capacitor C5 are capacitors for branch pipes.

Next, the relationship between the configuration of the laminated LC filter 100 and the equivalent circuit will be described while comparing FIG. 1, FIG. 2, FIG. 3(A), and FIG.

The first inductor L1 of the first LC parallel resonator Re1 is formed by a conductive line that sequentially takes the line electrode 4i, the via electrode 8v, the line electrode 4h, and the via electrode with the input/output terminal 2a as a starting point. 8t, the via electrode 8r, the line electrode 4f, the via electrode 8p, the via electrode 8n, the line electrode 4d, the via electrode 81, the via electrode 8j, and the line electrode 4a are connected.

The first capacitor C1 of the first LC parallel resonator Re1 is formed by a capacitance formed between the capacitor electrode 5d connected to the input/output terminal 2a and the capacitor electrode 5c.

In addition, the line electrode 4a and the capacitor which are the end points of the first inductor L1 The capacitor electrode 5c of C1 is connected by a conductive line in which the via electrode 8i, the connection electrode 7e, the via electrode 8h, the connection electrode 7d, and the via electrode 8g are sequentially connected. Further, the via electrode 8i, the connection electrode 7e, the via electrode 8h, the connection electrode 7d, and the via electrode 8g may constitute a connection point between the first LC parallel resonator Re1 and the second LC parallel resonator Re2.

The second inductor L2 of the second LC parallel resonator Re2 is formed by a conductive line that sequentially takes the line electrode 4j, the via electrode 8w, the via electrode 8u, and the line electrode starting from the input/output terminal 2b. 4g, the via electrode 8s, the via electrode 8q, the line electrode 4e, the via electrode 8o, the via electrode 8m, the line electrode 4c, the via electrode 8k, and the line electrode 4b are connected. In the multilayer LC filter 100 of the present embodiment, the winding direction of the first inductor L1 of the first LC parallel resonator Re1 and the winding direction of the second inductor L2 of the second LC parallel resonator Re2 are opposite to each other.

The second capacitor C2 of the second LC parallel resonator Re2 is formed by a capacitance formed between the capacitor electrode 5e connected to the input/output terminal 2b and the capacitor electrode 5c.

Further, the line electrode 4b as the starting point of the second inductor L2 and the capacitor electrode 5c of the capacitor C2 are formed by a conductive line which sequentially connects the via electrode 8i, the connection electrode 7e, the via electrode 8h, and the like. The electrode 7d and the via electrode 8g are connected. Further, as described above, the via electrode 8i, the connection electrode 7e, the via electrode 8h, the connection electrode 7d, and the via electrode 8g may constitute a connection point between the first LC parallel resonator Re1 and the second LC parallel resonator Re2.

The third capacitor C3 is formed by a capacitance formed between the capacitor electrode 5a connected to the input/output terminal 2a and the ground electrode 6b.

The fourth capacitor C4 is connected to the capacitor formed between the capacitor electrode 5c and the ground electrode 6b at the connection point between the first LC parallel resonator Re1 and the second LC parallel resonator Re2. form.

The fifth capacitor C5 is formed by a capacitance formed between the capacitor electrode 5b connected to the input/output terminal 2b and the ground electrode 6b.

The multilayer LC filter 100 of the first embodiment having the above configuration and equivalent circuit has the following features.

In the laminated LC filter 100, the line electrodes 4d, 4f, and 4h of the first inductor L1 constituting the first LC parallel resonator Re1 and the line electrode 4c of the second inductor L2 constituting the second LC parallel resonator Re2, 4e and 4g are formed in layers which are different from each other inside the laminated body 1. For example, as shown in FIG. 3(B), the line electrode 4h formed on the main surface on the upper side of the insulator layer 1m and the line electrode 4g formed on the main surface on the lower side of the insulator layer 1m are formed inside the laminated body 1 The layers which are different from each other can be freely arranged without interfering with each other in the planar direction.

In the related art, for example, the line electrode 4c, the line electrode 4d, the line electrode 4e, and the line electrode 4f, the line electrode 4g and the line electrode 4h are formed in the same layer inside the laminated body 1, respectively, and thus the line electrode 4c and the line electrode 4d are formed. A gap must be provided between the line electrode 4e and the line electrode 4f, and between the line electrode 4g and the line electrode 4h, so that the line electrodes 4c, 4e, 4g, 4d, 4f, and 4h cannot be freely arranged. Further, the patterns of the line electrodes 4c, 4e, 4g, 4d, 4f, and 4h cannot be increased, and the lengths of the line electrodes 4c, 4e, 4g, 4d, 4f, and 4h cannot be increased.

In the multilayer LC filter 100, the line electrodes 4d, 4f, and 4h constituting the first inductor L1 and the line electrodes 4c, 4e, and 4g constituting the second inductor L2 are formed inside the laminated body 1. Layers different from each other, and thus the line electrodes 4c, 4e, 4g, 4d, 4f, 4h is freely arranged in the plane direction. Further, the pattern of the line electrodes 4c, 4e, 4g, 4d, 4f, 4h can be increased, and the lengths of the line electrodes 4c, 4e, 4g, 4d, 4f, 4h can be increased.

In the present embodiment, the patterns of the line electrodes 4c, 4e, 4g, 4d, 4f, and 4h are increased, and the lengths of the line electrodes 4c, 4e, 4g, 4d, 4f, and 4h are increased as compared with the prior art.

Further, in the present embodiment, when the laminated body 1 is seen in the laminated direction of the insulating layers 1a to 1o, the line electrodes 4d, 4f, 4h of the inductor L1 and the line electrodes 4c, 4e constituting the second inductor L2 are formed. 4g is formed in a partially overlapping manner.

As a result, in the multilayer LC filter 100, the inductance value of the first inductor L1 and the inductance value of the second inductor L2 increase.

Further, in the multilayer LC filter 100, the line electrodes 4d, 4f, and 4h of the first inductor L1 and the line electrodes 4c, 4e, and 4g of the second inductor L2 are partially overlapped, and thus the first inductor L1. A capacitive coupling occurs between the second inductor L2 and the second inductor L2.

Further, in the multilayer LC filter 100, the line electrodes 4d, 4f, and 4h of the first inductor L1 are formed close to the line electrodes 4c, 4e, and 4g of the second inductor L2, thereby enhancing the first inductor L1. Magnetic coupling with the second inductor L2.

Further, in the present embodiment, as described above, the line electrodes 4d, 4f, and 4h constituting the inductor L1 and the line electrodes 4c, 4e, and 4g constituting the second inductor L2 are partially overlapped when they are seen in the laminated direction. For example, when it is desired to increase the diameter of one line electrode and reduce the diameter of the other line electrode, it may be formed so as not to overlap.

As described above, in the multilayer LC filter 100 of the first embodiment, the line electrodes 4d, 4f, and 4h constituting the first inductor L1 and the line electrodes 4c, 4e, and 4g constituting the second inductor L2 are provided. The inside of the laminated body 1 is formed in layers different from each other, so that the line can be The path electrodes 4c, 4e, 4g, 4d, 4f, and 4h are freely arranged in the planar direction, and the degree of freedom in designing the laminated LC filter is particularly improved.

[Experimental example]

The following experiment was conducted in order to confirm the effectiveness of the present invention.

As an embodiment, the LC-type LC filter 100 of the first embodiment shown in Figs. 1 to 4 is produced.

As a comparative example, the multilayer LC filter 1300 shown in FIGS. 5 and 6 (A) and (B) was produced. FIG. 5 is an exploded perspective view of the laminated LC filter 1300. Fig. 6(A) is a cross-sectional view showing a laminated LC filter 1300. Fig. 6(B) is a plan view showing the insulator layer 51j which will be described later in the laminated LC filter 1300. In addition, the laminated LC filter 1300 has the same equivalent value as the equivalent circuit of the multilayer LC filter 100 of the first embodiment shown in FIG. 4, although the characteristic values of the elements are different.

The multilayer LC filter 1300 of the comparative example will be described.

The laminated LC filter 1300 includes a laminated body 51 in which insulator layers 51a to 51m are laminated.

The insulator layers 51a to 51f also include the electrodes formed, and have the same structure as the insulator layers 1a to 1f of the laminated LC filter 100, and thus the description thereof will be omitted.

A line electrode 54a and a line electrode 54b are formed on the main surface of the upper side of the insulator layer 51g. Further, a via electrode 58i is formed between the two main faces of the insulator layer 51g. Further, one end of the line electrode 54a and one end of the line electrode 54b are connected to each other, and then connected to the via electrode 58i. Further, the via electrode 58i is connected to the connection electrode 7e.

The main surface of the upper side of the insulator layer 51h is formed with a line electrode 54c and a line electrode. Extreme 54d. Further, a via electrode 58j and a via electrode 58k are formed to penetrate between the main faces of the insulator layer 51h. Further, one end of the line electrode 54c is connected to the via electrode 58j, and one end of the line electrode 54d is connected to the via electrode 58k. Further, the via electrode 58j is connected to the other end of the line electrode 54a, and the via electrode 58k is connected to the other end of the line electrode 54b.

A line electrode 54e and a line electrode 54f are formed on the main surface on the upper side of the insulator layer 51i. Further, a via electrode 58l and a via electrode 58m are formed between the two main faces of the insulator layer 51i. Further, one end of the line electrode 54e is connected to the via electrode 58l, and one end of the line electrode 54f is connected to the via electrode 58m. Further, the via electrode 58l is connected to the other end of the line electrode 54c, and the via electrode 58m is connected to the other end of the line electrode 54d.

A line electrode 54g and a line electrode 54h are formed on the main surface on the upper side of the insulator layer 51j. Further, a via electrode 58n and a via electrode 58o are formed between the two main faces of the insulator layer 51j. Further, one end of the line electrode 54g is connected to the via electrode 58n, and one end of the line electrode 54h is connected to the via electrode 58o. Further, the via electrode 58n is connected to the other end of the line electrode 54e, and the via electrode 58o is connected to the other end of the line electrode 54f.

A line electrode 54i and a line electrode 54j are formed on the main surface on the upper side of the insulator layer 51k. Further, a via electrode 58p and a via electrode 58q are formed between the two main faces of the insulator layer 51k. Further, one end of the line electrode 54i is connected to the via electrode 58p, and one end of the line electrode 54j is connected to the via electrode 58q. Further, the via electrode 58p is connected to the other end of the line electrode 54g, and the via electrode 58q is connected to the other end of the line electrode 54h.

A line electrode 54k and a line electrode 54l are formed on the main surface of the upper side of the insulator layer 51l. Further, two via electrodes 58r and 58s are formed between the two main faces of the insulator layer 51l. Moreover, one end of the line electrode 54k is connected to the via electrode 58r, and one end of the line electrode 54l is connected. On the via electrode 58s. Further, the other end of the line electrode 54k is connected to the input/output terminal 2a, and the other end of the line electrode 54j is connected to the input/output terminal 2b (see FIG. 2, and the terminal electrodes 2a and 2b are included in FIG. 2 according to the first embodiment). The same structure). Further, the via electrode 58r is connected to the other end of the line electrode 54i, and the via electrode 58s is connected to the other end of the line electrode 54j.

The insulator layer 51m is a protective layer, and no electrode is formed.

In the multilayer LC filter 1300 of the comparative example, the first inductor L1 of the first LC parallel resonator Re1 is formed by a conductive line, and the conductive line uses the input/output terminal 2a as a starting point to sequentially connect the line electrode 54k, The via electrode 58r, the line electrode 54i, the via electrode 58p, the line electrode 54g, the via electrode 58n, the line electrode 54e, the via electrode 581, the line electrode 54c, the via electrode 58j, and the line electrode 54a are connected. Further, the second inductor L2 of the second LC parallel resonator Re2 is formed by a conductive path. The conductive line uses the input/output terminal 2b as a starting point, and sequentially connects the line electrode 54l, the via electrode 58s, the line electrode 54j, and the pass. The hole electrode 58q, the line electrode 54h, the via electrode 58o, the line electrode 54f, the via electrode 58m, the line electrode 54d, the via electrode 58k, and the line electrode 54b are connected.

However, in the multilayer LC filter 1300 of the comparative example, the line electrode 54c and the line electrode 54d, the line electrode 54e and the line electrode 54f, the line electrode 54g and the line electrode 54h, the line electrode 54i and the line electrode 54j, the line electrode 54k, and the line The electrodes 54l are formed close to each other in the same layer of the laminated body 1, so that the size and length of the pattern of the line electrodes 54c, 54e, 54g, 54i, 54k and the line electrodes 54d, 54f, 54h, 54j, 54l cannot be further increased. The size and length of the pattern. Further, the line electrodes 54c, 54e, 54g, 54i, 54k cannot be brought closer to the line electrodes 54d, 54f, 54h, 54j, 54l. For example, as shown in FIG. 6(B), the line electrode 54g and the line electrode 54h formed on the main surface on the upper side of the insulator layer 51j cannot be further Increase the size or length of the respective pattern, or make it closer to the two.

As a result, in the multilayer LC filter 1300 of the comparative example, the inductance value of the first inductor L1 and the inductance value of the second inductor L2 are respectively decreased. Further, Q of the first inductor L1 and Q of the second inductor L2 are respectively decreased. Further, the magnetic coupling between the first inductor L1 and the second inductor L2 is weakened. Further, the first inductor L1 and the second inductor L2 are hardly capacitively coupled.

The frequency characteristic of the multilayer LC filter 100 of the embodiment is compared with the frequency characteristic of the multilayer LC filter 1300 of the comparative example in FIG.

As can be seen from FIG. 7, in the multilayer LC filter 100 of the embodiment, the inductance values of the first inductor L1 and the second inductor L2 are larger than the multilayer LC filter 1300 of the comparative example, and Q is increased, and as symbol A. As shown, the insertion loss is improved by approximately 0.1 dB. Further, the first inductor L1 and the second inductor L2 are close to each other, and the magnetic coupling is increased, whereby the pole P formed near 2.2 GHz is shifted toward the high frequency side. As apparent from the above, according to the present invention, the characteristics of the laminated LC filter can be improved.

[Second Embodiment]

The laminated LC filter 200 of the second embodiment is shown in Figs. 8 and 9 .

8 is an exploded perspective view of the laminated LC filter 200. FIG. 9 is a plan view showing the insulator layer 1m of the laminated LC filter 200. In addition, FIG. 9 shows the line electrode 14h formed on the main surface on the upper side of the insulator layer 1m, and the line electrode 14g formed on the main surface on the lower side of the insulator layer 1m is seen in perspective.

In the multilayer LC filter 200, the shapes of the line electrodes 4c, 4d, 4e, 4f, 4g, and 4h of the multilayer LC filter 100 of the first embodiment are changed, and the pattern is made larger and the length is larger to form a line. Electrodes 14c, 14d, 14e, 14f, 14g, 14h.

As a result, when the laminated LC filter 200 sees the laminated body 1 in the laminated direction of the insulating layers 1a to 1o, the line electrodes 14d, 14f, and 14h which are part of the first inductor L1 of the first LC parallel resonator Re1 are formed. The line electrodes 14c, 14e, and 14g which are part of the second inductor L2 constituting the second LC parallel resonator Re2 overlap and intersect at two places. For example, as shown in FIG. 9, the line electrode 14g and the line electrode 14h overlap and intersect at two places (B1, B2).

The other configuration of the laminated LC filter 200 is the same as that of the laminated LC filter 100.

In the multilayer LC filter 200, the inductance values of the first inductor L1 and the second inductor L2 are further increased, and Q is further improved.

[Third embodiment]

Fig. 10 and Fig. 11 show a laminated LC filter 300 according to the third embodiment.

10 is an exploded perspective view of the laminated LC filter 300. FIG. 11 is a plan view showing the insulator layer 11 which will be described later in the multilayer LC filter 200. In addition, FIG. 11 shows the line electrode 24g formed on the main surface on the upper side of the insulator layer 11, and the line electrode 24f formed on the principal surface on the lower side of the insulator layer 11 is seen in perspective.

In the multilayer LC filter 100 of the first embodiment, the winding direction of the first inductor L1 of the first LC parallel resonator Re1 and the winding direction of the second inductor L2 of the second LC parallel resonator Re2 are opposite directions. On the other hand, in the multilayer LC filter 300 of the third embodiment, the winding direction of the first inductor L1 is reversed, and the winding direction of the first inductor L1 and the second inductor L2 are wound. The direction is the same direction.

Specifically, in the laminated LC filter 300, first, the winding direction of the line electrode 4a formed in the insulator layer 1g in the first embodiment is reversed to form the line electrode 24a. Then, the winding direction of the line electrode 4i formed in the insulator layer 1n in the first embodiment is reversed to form the line electrode 24i.

Then, in accordance with the above-described changes, the shapes of the line electrodes 4b, 4c, 4d, 4e, 4f, 4g, 4h, and 4j formed in the insulator layers 1h to 1n in the first embodiment are changed (adjusted) to form The line electrodes 14b, 14c, 14d, 14e, 14f, 14g, 14h, and 14j (the line electrodes whose shape is not changed also exist). Next, the via electrodes 8j, 8k, 8l, 8m, 8n, 8o, 8p, 8q, 8r, 8s, 8p, 8q, 8r, 8s, 8t, 8u, 8v, 8w formed in the insulator layers 1h to 1n in the first embodiment are changed (adjusted). The formation positions are such that the via electrodes 28j, 28k, 28l, 28m, 28n, 28o, 28p, 28q, 28r, 28s, 28t, 28u, 28v, 28w (the via electrodes whose formation positions are not changed) are formed.

As a result, in the laminated LC filter 300, the winding direction of the first inductor L1 and the winding direction of the second inductor L2 are in the same direction.

When the laminated LC filter 300 is used, the first inductor L1 takes the input/output terminal 2a as a starting point, and follows the line electrode 4i, the via electrode 8v, the line electrode 4h, the via electrode 8t, and the via electrode 8r. The line electrode 4f, the via electrode 8p, the via electrode 8n, the line electrode 4d, the via electrode 81, the via electrode 8j, and the line electrode 4a flow in a sequence. On the other hand, in the second inductor L2, the via electrode 4b is used as the starting point, and the via electrode 8k, the line electrode 4c, the via electrode 8m, the via electrode 8o, the line electrode 4e, the via electrode 8q, and the via electrode are used. The current flows in the order of 8s, the line electrode 4g, the via electrode 8u, the via electrode 8w, the line electrode 4j, and the input/output terminal 2b.

When the laminated body 1 is seen in the laminated direction of the insulator layers 1a to 1o, the current flowing in the first inductor L1 rotates counterclockwise, and the current flows in the second inductor L2. Rotate clockwise.

Fig. 11 shows the line electrode 24f and the line electrode 24g formed on the two main faces of the insulator layer 11, and the direction of the current flowing in the first inductor L1 is indicated by the symbol D1, and the flow is performed in the second inductor L2 by the symbol D2. The direction of the current. As can be seen from FIG. 11, the current flowing in the line electrode 24f constituting the first inductor L1 rotates counterclockwise D1, and the current flowing in the line electrode 24g constituting the second inductor L2 rotates clockwise D2.

Further, in the hollow core of the first inductor L1, magnetic flux is generated from the top to the bottom in the laminated direction of the insulator layers 1a to 1o. On the other hand, in the hollow core of the second inductor L2, a magnetic flux is generated from the bottom in the laminated direction of the insulator layers 1a to 1o.

As a result, the multilayer LC filter 300 of the third embodiment is the second inductor L1 of the first LC parallel resonator Re1 and the second inductor of the second LC parallel resonator Re2, compared with the multilayer LC filter 100 of the first embodiment. The magnetic coupling of the inductor L2 is enhanced. The structure of the multilayer LC filter 300 of the third embodiment is effective for enhancing the magnetic coupling between the LC parallel resonators.

As described above, the multilayer LC filter 100 of the first embodiment has been described as the laminated LC filter 300 of the third embodiment. However, the present invention is not limited to the above, and various modifications can be made in accordance with the gist of the invention.

For example, the LC filters 100 to 300 are all 5th-order LC filters with two LC parallel resonators and three branch capacitors. However, it is also necessary to increase the LC parallel resonator or branch capacitors to increase the order of the LC filter. number.

Further, in the multilayer LC filters 100 to 300, the line electrodes constituting the first inductor and the line electrodes constituting the second inductor are alternately laminated, but this need not be the case. The stacking order of the line electrodes is changed according to the required frequency characteristics.

Further, the laminated LC filters 100 to 300 are all low-pass filters, but the type of the filter in the present invention is not limited, and may be a band pass filter or a high-pass filter. Further, in these cases, as described above, the number of stages (the order of the filters) of the LC parallel resonator is arbitrary.

Further, in the case where the laminated LC filters 100 to 300 are both formed in the laminated direction, the line electrode constituting the first inductor partially overlaps the line electrode constituting the second inductor, but the overlap is not The composition necessary in the present invention. For example, when the diameter of the line electrode constituting the first inductor is large and the diameter of the line electrode constituting the second inductor is small, when it is seen in the laminated direction, the two may not overlap each other. In this case, the effect of the present invention can be achieved by increasing the diameter of the line electrode constituting the first inductor, and is included in the present invention.

1‧‧ ‧ laminated body

1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1l, 1m, 1n, 1o‧‧‧ insulator layer

4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j‧‧‧ line electrodes

5a, 5b, 5c, 5d, 5e‧‧‧ capacitor electrodes

6a, 6b‧‧‧ grounding electrode

7a, 7b, 7c, 7d, 7e‧‧‧ connection electrodes

8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h, 8i, 8j, 8k, 8l, 8m, 8n, 8o, 8p, 8q, 8r, 8s, 8t, 8u, 8v, 8w‧‧‧ through holes electrode

100‧‧‧Multilayer LC filter

Claims (8)

A laminated LC filter comprising: a laminate body in which a plurality of insulator layers are laminated; a plurality of line electrodes formed between layers of the plurality of insulator layers constituting the laminate; and a plurality of capacitor electrodes formed to constitute the laminate Between the plurality of layers of the insulator layer; a plurality of via electrodes are formed to penetrate between the two main faces of the insulator layer; the first input/output terminal and the second input/output terminal are formed on the surface of the laminate; and at least one a grounding terminal having at least a first LC parallel resonator and a second LC parallel resonator inserted between the first input/output terminal and the second input/output terminal, wherein the first LC parallel resonator is a first inductor and a first inductor A capacitor is connected in parallel, wherein the second LC parallel resonator is connected in parallel with a second inductor and a second capacitor, and the first inductor and the second inductor each have a plurality of the line electrodes And at least one of the via electrodes is connected in a predetermined order, and the first capacitor and the second capacitor are respectively used The capacitor electrodes are formed, a layer constituting the above-described laminate of a plurality of the aforementioned insulating layers, is formed above the aforementioned first line electrode forming the inductor, said line is not formed with the second electrode of the inductor, in the structure The other electrode layer of the plurality of insulator layers forming the laminate is formed with the line electrode forming the second inductor, and the line electrode of the first inductor is not formed. The multilayer LC filter according to the first aspect of the invention, wherein the first LC parallel resonator and the second LC parallel resonator are connected in series between the first input/output terminal and the second input/output terminal. The multilayer LC filter according to the second aspect of the invention, wherein the first LC parallel resonator and the second LC are between a connection point between the first input/output terminal and the first LC parallel resonator and the ground terminal; At least one of a connection point between the parallel resonator and the ground terminal, and a connection point between the second LC parallel resonator and the second input/output terminal and the ground terminal, the third capacitor or the third capacitor The fourth capacitor or the third capacitor, the fourth capacitor, and the fifth capacitor are connected to each other to constitute a low-pass filter. The laminated LC filter according to any one of claims 1 to 3, wherein, when the laminated body is seen in a direction of lamination of the insulating layer, the line electrode of the first inductor is formed and The above-mentioned line electrodes of the second inductor partially overlap. The laminated LC filter according to the fourth aspect of the invention, wherein the layer electrode of the first inductor and the second inductor are formed when the layered body is seen in a direction of lamination of the insulator layer The line electrodes overlap and cross each other at two places. The multilayer LC filter according to any one of claims 1 to 3, wherein the line electrode forming the first inductor and the line electrode of the second inductor are laminated on the insulator layer The direction is formed between layers of the above laminated body which are different from each other. The multilayer LC filter according to any one of claims 1 to 3, wherein the first LC parallel resonator and the second LC are interposed between the first input/output terminal and the second input/output terminal Outside the parallel resonator, one or a plurality of LC parallel resonators are connected in series. The laminated LC filter according to any one of claims 1 to 3, wherein, when the laminated body is seen in a direction of lamination of the insulating layer, the line electrode forming the first inductor is passed through The direction of the current is opposite to the direction of the current flowing through the line electrode forming the second inductor.