JP2001119209A - Laminated filter module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small laminated filter module that has a small amount of electrical coupling among a plurality of built-in filters. SOLUTION: The axes of the inductors L1 to L3 of resonators Q1 to Q3 constituting a bandpass filter BPF1 cross orthogonally with those of the inductors L4 to L6 of resonators Q4 to Q6 constituting a bandpass filter BPF2. The inductors L1 to L3 are respectively constituted of patterns of the inductors 61a, 61b, 62a, 62b, 63a and 63b formed on the surfaces of insulation sheets 46 and 48. The inductors L3 to L6 are constituted of patterns for the inductors 64a, 64b, 65a, 65b, 66a and 66b formed on the surfaces of the insulation sheets 46 and 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer filter module, for example, a multilayer duplexer, a multilayer triplexer, a multilayer diplexer used in a microwave band,
Alternatively, it relates to a laminated filter array or the like.

[0002]

2. Description of the Related Art As this type of laminated filter module, a laminated duplexer having a structure shown in FIGS. 8 and 9 has been conventionally known. As shown in FIG. 8, the laminated duplexer 1 has a ceramic sheet 6 provided with inductor patterns 12 to 17 on its surface, a ceramic sheet 7 provided with frequency adjusting capacitor patterns 18 to 23 on its surface, And ceramic sheets 3 and 9 each having a shield pattern 28a, 29a, 28b, 29b provided on the surface.

In the left half of the duplexer 1, a three-stage band-pass filter BPF1 comprising LC resonators Q1 to Q3 is provided.
Are arranged. LC on the right half of duplexer 1
Three-stage bandpass filter B including resonators Q4 to Q6
PF2 is provided. The inductors L1 to L6 of the LC resonators Q1 to Q6 are respectively the inductor pattern 1
2, 13, 14, 15, 16 and 17.
The capacitors C1 to C6 of the LC resonators Q1 to Q6 are frequency-adjusting capacitor patterns 18, 19, 2 respectively.
0, 21, 22, 23, and inductor patterns 12, 13, 14, 1 facing these frequency adjustment capacitor patterns 18, 19, 20, 21, 22, 23.
5, 16, and 17 are formed.

Further, the L of the band-pass filter BPF1 is
The C resonators Q1 to Q3 have inductor patterns 12 to 1 respectively.
4 and coupling capacitors Cs1 and Cs2 formed by coupling adjustment capacitor patterns 24 and 25 facing the inductor patterns 12 to 14, respectively. And patterns 12-14, 18-20, 2
4 and 25 are sandwiched between the shield patterns 28a and 28a.
b is arranged. Similarly, the bandpass filter BP
The LC resonators Q4 to Q6 of F2 include inductor patterns 15 to 17 and coupling adjustment capacitor patterns 26 and 27 facing these inductor patterns 15 to 17.
And are electrically coupled by coupling capacitors Cs3 and Cs4 formed by. And patterns 15-17, 21-
Shield pattern 29 with 23, 26, 27 interposed
a, 29b are arranged.

[0005] As shown in FIG.
To the transmission terminal electrode T
x, a receiving terminal electrode Rx, an antenna terminal electrode ANT, and ground terminal electrodes G1 to G4. The transmitting terminal electrode Tx is connected to the inductor pattern 12 of the LC resonator Q1, the receiving terminal electrode Rx is connected to the inductor pattern 17 of the LC resonator Q6, and the antenna terminal electrode ANT is connected to the LC resonator. The inductor patterns 14 and 15 of Q3 and Q4 are connected. The grounding terminal electrodes G1 and G2 are connected to the LC resonator Q1 respectively.
To Q3, one end of inductor patterns 12 to 14, one end of frequency adjustment capacitor patterns 18 to 20, and shield patterns 28a and 28b. Each of the ground terminal electrodes G3 and G4 has LC
One end of inductor patterns 15 to 17 of resonators Q4 to Q6, and capacitor patterns 21 to 21 for frequency adjustment
23 is connected to one end and shield patterns 29a and 29b.

[0006]

The conventional duplexer 1 has two inductor patterns 12 to 14 forming a band-pass filter BPF1 and an inductor pattern 15 forming a band-pass filter BPF2.
17 to 17 are formed on the same ceramic sheet 6 in a state of running parallel to each other over the entire length. For this reason, the magnetic field components generated in the inductor patterns 12 to 14 and the magnetic field components generated in the inductor patterns 15 to 17 have a mutually parallel relationship over the entire length of the inductor patterns 12 to 17. As a result, there is a problem that the band-pass filters BPF1 and BPF2 are easily electrically coupled, and the filter characteristics of the band-pass filters BPF1 and PBF2 change.

As a countermeasure against this, a band-pass filter BP
It is necessary to increase the interval between F1 and BPF2, and to arrange a shield pattern between the bandpass filters BPF1 and BPF2. However, even if such measures are taken, it is not enough to suppress the electrical coupling between the band-pass filters BPF1 and BPF2, and new problems such as an increase in the size of the duplexer 1 arise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small-sized laminated filter module in which electric coupling between a plurality of built-in filters is small.

[0009]

To achieve the above object, a laminated filter module according to the present invention has at least one pair of input / output terminals, one end of which is grounded and the other end of which is open. A plurality of filters having conductors are embedded in the laminate, and the inductor conductors of the adjacent filters do not have a portion running in parallel over the entire length. Here, "the inductor conductor does not have a portion that runs in parallel over the entire length" means that when the inductor conductor is viewed from the grounded end to the open end, each inductor has a direction of extension. This means that there are no portions that extend parallel to each other over the entire length.
In order to prevent the inductor conductor from having a portion running parallel in parallel over the entire length, for example, the inductor conductors are orthogonal to each other, the inductor conductors are opposed to each other, or the inductor Conductors are arranged in an interdigital manner with each other.

[0010]

According to the above arrangement, since the inductor conductors of the filters do not have a portion running in parallel, electrical coupling between the filters is suppressed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a laminated filter module according to an embodiment of the present invention.

[First Embodiment, FIGS. 1 to 3] FIG. 1 shows the configuration of a laminated duplexer 41, and FIGS. 2 and 3 show an external perspective view and an electrical equivalent circuit diagram of the duplexer 41, respectively. The duplexer 41 includes LC parallel resonators Q1 to Q1.
A three-stage bandpass filter BPF1 having Q3;
This is a combination of a three-stage bandpass filter BPF2 having C parallel resonators Q4 to Q6.

As shown in FIG. 1, the laminated duplexer 4
1 is a frequency adjustment capacitor pattern 73a-76.
a, an insulating sheet 4 provided with each of 73b to 76b
5, 49 and inductor patterns 61a to 66a, 6
Insulating sheets 46 and 48 provided with 1b to 66b, respectively.
And an insulating sheet 47 provided with coupling adjustment capacitor patterns 81 to 84, and shield patterns 94a and 95.
a, the insulating sheet 4 provided with 94b and 95b respectively
3, 51, and dummy insulating sheets 44, 50 and the like.

The insulating sheets 42 to 51 are formed by kneading a dielectric powder or a magnetic powder together with a binder or the like to form a sheet. Inductor patterns 61a to 66
a, 61b-66b and frequency-adjusting capacitor patterns 73a-76a, 73b-76b are Ag, Pd, C
u, Au, Ag-Pd, etc., and formed by a method such as printing.

Inductor patterns 61a to 63a, 6
1b to 63b are formed in a substantially left half area of the insulating sheets 46 and 48. Inductor pattern 61a
To 63a, 61b to 63b are insulating sheets 46, 48
Are arranged in parallel from the left side to the right side. Inductor patterns 61a to 63a, 6
One end of each of 1b to 63b is exposed on the left side of the sheets 46 and 48, and the other end is an open end.

The inductor patterns 61a and 61b have substantially the same shape and are laminated via sheets 46 and 47.
The inductor L1 has a double structure. Similarly, the inductor patterns 62a, 62b, 63a, 63b also constitute the double-structured inductors L2, L3, respectively. Since the inductors L1 to L3 have a double structure, by adjusting the interval between the inductor patterns 61a and 61b, the interval between the inductor patterns 62a and 62b, and the interval between the inductor patterns 63a and 63b, each of the inductors L1 to L3 is adjusted. Can be optimized, and the concentration of the magnetic field H at the edges of the inductor patterns 61a to 63b can be reduced.

The axes of the inductors L1 to L3 are parallel to the direction from the left side to the right side of the insulating sheets 46 and 48. When a current flows through the inductors L1 to L3, a magnetic field is generated around each of the inductors L1 to L3 so as to orbit a plane perpendicular to the axial direction of the inductors L1 to L3.

The inductor patterns 61a and 61b are:
The lead patterns 85a and 85b are connected to the lead patterns 85a and 85b, respectively, and the lead patterns 85a and 85b are exposed on the left side of the inner sides of the sheets 46 and 48. Inductor pattern 6
3a and 63b are inductor patterns 91, respectively.
a, 91b. Inductor pattern 91
a and 91b constitute an impedance matching inductor Ls1.

The frequency adjusting capacitor pattern 73a,
73b extends from the near side to the far side of the sheets 45, 49 at a position near the center left of the insulating sheets 45, 49. The frequency-adjusting capacitor patterns 73a and 73b face the front ends of the inductor patterns 61a and 61b with the sheets 45 and 48 interposed therebetween, respectively, and form a capacitor C1. And the capacitor C
The LC parallel resonator Q1 is composed of a single inductor L1 and a double-structure inductor L1.
Is configured. Further, the frequency adjusting capacitor patterns 73a and 73b are connected to the inductor patterns 62a and 62b.
The capacitor C2 is formed facing the tip of the capacitor pattern b, and the capacitor C3 is formed facing the tip of the inductor patterns 63a and 63b. The capacitor C2 and the inductor L2 having a double structure are connected to the LC parallel resonator Q.
2 and a capacitor C3 and a double-structured inductor L
3 together form an LC parallel resonator Q3.

Coupling adjustment capacitor patterns 81 and 82
Are arranged on the left side of the center of the seat 47, and the seats 42 to
In the stacking direction of 51, the inductor pattern 6
It is located between 1a-63a and 61b-63b. The coupling adjustment capacitor patterns 81 and 82 are
Inductor patterns 61a-63 across 6, 47
a, a coupling capacitor Cs1 and a resonator Q opposing the distal ends of 61b to 63b for coupling the resonators Q1 and Q2.
2 and a resonator Q3 to form a coupling capacitor Cs2. Then, the patterns 61a to 63b, 73a, 73
b of the shield patterns 94a, 94
b is arranged.

Inductor patterns 64a to 66a, 6
4b to 66b are formed in a substantially right half area of the insulating sheets 46 and 48. Inductor pattern 64a
To 66a, 64b to 66b are insulating sheets 46, 48
Are arranged in parallel from the near side to the far side. Inductor patterns 64a-
One end of each of 66a, 64b to 66b is a sheet 4
It is exposed to the front side of 6, 48, and the other end is an open end. The inductor patterns 64a and 64b are stacked via the sheets 46 and 47, and have a double-structured inductor L.
4. Similarly, the inductor pattern 65
a, 65b, 66a, and 66b also constitute the double-structured inductors L5 and L6, respectively.

The axes of the inductors L4 to L6 are parallel to the direction from the near side to the far side of the insulating sheets 46 and 48. Then, when a current flows through the inductors L4 to L6, a magnetic field orbiting around a plane perpendicular to the axial direction of the inductors L4 to L6 is generated around each of the inductors L4 to L6. Note that inductors L4 to L6
Are parallel to the direction from the right side to the left side of the sheets 46 and 48, and the axes of the inductors L1 to L3 are
It is needless to say that 6,48 may be parallel to the direction from the near side to the far side.

The inductor patterns 66a and 66b are:
The lead patterns 86a and 86b are connected to the lead patterns 86a and 86b, respectively, and are exposed on the right sides of the sheets 46 and 48. Inductor patterns 64a, 64b
Are connected to the inductor patterns 92a and 92b. The inductor patterns 92a and 92b constitute an impedance matching inductor Ls2.
The inductor patterns 92a and 92b are connected to the lead patterns 87a and 87b together with the inductor patterns 91a and 91b, respectively. Drawer pattern 87
a, 87b are exposed at the center of the front side of the sheets 46, 48.

Frequency adjusting capacitor patterns 74a-
76a, 74b to 76b are formed in substantially the right half area of the insulating sheets 45, 49, and one end of each is exposed to the back side of the sheets 45, 49. The frequency adjustment capacitor patterns 74a and 74b are connected to the frequency adjustment capacitor patterns 73a and 73b, respectively.

The frequency adjusting capacitor patterns 74a,
74b opposes the leading ends of the inductor patterns 64a and 64b with the sheets 45 and 48 interposed therebetween, respectively, and forms the capacitor C4. The capacitor C4 and the inductor L4 having a double structure constitute an LC parallel resonator Q4. Frequency adjustment capacitor patterns 75a, 75b
Oppose the tips of the inductor patterns 65a and 65b, respectively, to form a capacitor C5. The capacitor C5 and the inductor L5 having a double structure constitute an LC parallel resonator Q5. The frequency adjusting capacitor patterns 76a and 76b are respectively
A capacitor C6 is formed so as to face the tips of 6a and 66b. The capacitor C6 and the double-structured inductor L6 constitute an LC parallel resonator Q6.

Coupling adjusting capacitor patterns 83 and 84
Are arranged on the right side of the sheet 47, and in the stacking direction of the sheets 42 to 51, the inductor patterns 64a to
66a and between 64b-66b. The coupling adjustment capacitor patterns 83 and 84 are
7 with inductor patterns 64a to 66a, 64
b to 66b, the resonators Q4 and Q5
And a coupling capacitor Cs4 coupling the resonators Q5 and Q6. Wide shield patterns 95a and 95b are arranged with the patterns 64a to 66b and 74a to 76b interposed therebetween. The shield patterns 95a and 95b are electrically connected to the shield patterns 94a and 94b via connection patterns 96a and 96b, respectively.

Each of the sheets 42 to 51 having the above-described configuration is sequentially stacked as shown in FIG. 1 and integrally fired to form a laminate 100 shown in FIG. A ground terminal electrode G1 and a receiving terminal electrode Rx are formed on the left and right end surfaces of the laminate 100, respectively. A transmitting terminal electrode Tx and a ground terminal electrode G3 are formed on the back side surface of the multilayer body 100, and an antenna terminal electrode ANT and ground terminal electrodes G2 and G4 are formed on the near side surface.

The lead pattern 8 is connected to the transmitting terminal electrode Tx.
5a and 85b are connected, the lead patterns 86a and 86b are connected to the receiving terminal electrode Rx, and the lead patterns 87a and 87b are connected to the antenna terminal electrode ANT. The ground terminal electrode G1 has shield patterns 94a and 94b and inductor patterns 61a to 61a.
3a, 61b to 63b are connected, the shield terminal 94a, 94b and the ends of the frequency adjusting capacitor patterns 73a, 73b are connected to the ground terminal electrode G2, and the shield pattern 95a is connected to the ground terminal electrode G3. , 95b and the ends of the frequency adjustment capacitor patterns 74a to 76a, 74b to 76b are connected to the ground terminal electrode G4.
95b and inductor patterns 64a to 66a, 64
The ends of b to 66b are connected.

FIG. 3 is an electrical equivalent circuit diagram of the laminated duplexer 41 thus obtained. Resonators Q1 to Q3
Are electrically connected via the coupling capacitors Cs1 and Cs2 to form a three-stage bandpass filter BPF1. Resonators Q4 to Q6 are coupling capacitors Cs3 and Cs
4 to form a three-stage bandpass filter BPF2. Further, one end (resonator Q1) of the bandpass filter BPF1 is connected to the transmitting terminal electrode Tx.
And the other end (resonator Q3) is connected to an antenna terminal electrode ANT via an impedance matching inductor Ls1. Bandpass filter BPF2
(Resonator Q6) is connected to the receiving terminal electrode Rx, and the other end (resonator Q4) is connected to the antenna terminal electrode ANT via the impedance matching inductor Ls2.

Next, the operation and effect of the laminated duplexer 41 having the above configuration will be described. The duplexer 41 outputs a transmission signal entering the transmission terminal electrode Tx from a transmission circuit system (not shown) from the antenna terminal electrode ANT via the band-pass filter BPF1, and
The reception signal input from the antenna terminal electrode ANT is output from the reception terminal electrode Rx to the reception circuit system (not shown) via the band-pass filter BPF2.

The pass frequencies of the band-pass filter BPF1 are as follows: a resonator Q1 composed of an inductor L1 and a capacitor C1, a resonator Q2 composed of an inductor L2 and a capacitor C2, an inductor L3 and a capacitor C3.
Is determined by the respective resonance frequencies of the resonator Q3 constituted by The pass frequency of the band-pass filter BPF1 is adjusted by changing the capacitances of the capacitors C1 to C3, for example, by changing the areas of the capacitor patterns 73a and 73b of the capacitors C1 to C3.

On the other hand, the passing frequency of the band-pass filter BPF2 is determined by the resonator Q4 composed of the inductors L4 and C4, the resonator Q5 composed of the inductor L5 and the capacitor C5, and the inductor L6 and the capacitor C6. It is determined by each resonance frequency of the resonator Q6 configured. The pass frequency of the band-pass filter BPF2 is adjusted, for example, by changing the areas of the capacitor patterns 74a to 76a and 74b to 76b of the capacitors C4 to C6.

In the multilayer duplexer 41, as shown in FIG. 1, the axial directions of the inductors L1 to L3 of the bandpass filter BPF1 and the bandpass filter BPF2
Are orthogonal to the axial directions of the inductors L4 to L6. Therefore, the magnetic field generated by the current flowing through the inductors L1 to L3 is orthogonal to the magnetic field generated by the current flowing through the inductors L4 to L6, and the inductors L1 to L3 and the inductors L4 to L4
Electrical coupling with L6 can be minimized. As a result, it is possible to obtain the laminated duplexer 41 in which the deterioration of the attenuation characteristic and the impedance shift are small.

Here, the band-pass filters BPF1 and BPF1
It is not necessary to make the impedance matching inductors Ls1 and Ls2 electrically connected between the PF2 orthogonal.

[Second Embodiment, FIGS. 4 and 5] FIG. 4 shows the configuration of the laminated duplexer 110, and FIG. 5 is an external perspective view of the duplexer 110. Duplexer 110
Is a combination of a three-stage bandpass filter BPF1 having resonators Q1 to Q3 and a three-stage bandpass filter BPF2 having resonators Q4 to Q6.

Inductor patterns 111a to 113
a, 111b to 113b are formed in a substantially left half area of the insulating sheets 46, 48. The inductor patterns 111a to 113a and 111b to 113b are arranged in parallel with each other from the left side to the right side of the insulating sheets 46 and 48. One end of each of the inductor patterns 111a to 113a and 111b to 113b is exposed on the left side of the sheets 46 and 48, and the other end is an open end.

Inductor patterns 111a and 111b
Have substantially the same shape, are stacked via the sheets 46 and 47, and constitute an inductor L1 having a double structure. Similarly, inductor patterns 112a, 112b, 113
a and 113b are also double-structured inductors L2 and L2, respectively.
3. The axes of the inductors L1 to L3 are parallel to the direction from the left side to the right side of the insulating sheets 46 and 48.

Inductor patterns 111a and 111b
Are connected to the extraction patterns 135a and 135b, respectively, and the extraction patterns 135a and 135b are connected to the sheet 4
It is exposed on the left side of the back side of 6,48. The inductor patterns 113a and 113b are connected to the inductor patterns 141a and 141b, respectively. The inductor patterns 141a and 141b constitute an impedance matching inductor Ls1.

On the other hand, inductor patterns 114a-1
16a, 114b to 116b are insulating sheets 46, 4
8 is formed in a substantially right half area. The inductor patterns 114a to 116a and 114b to 116b
The insulating sheets 46 and 48 are arranged in a state of running in parallel from the right side to the left side. One end of each of the inductor patterns 114a to 116a and 114b to 116b is exposed on the right side of the sheets 46 and 48, and the other end is an open end. Inductor pattern 114a, 1
14b is laminated via the sheets 46 and 47, and constitutes a double structure inductor L4. Similarly, inductor patterns 115a, 115b, 116a, 116b
Also constitute the double-structured inductors L5 and L6.

The axes of the inductors L4, L5 and L6 are substantially collinear with the axes of the inductors L3, L2 and L1, respectively. Inductor patterns 111a, 112a, 113
a on the open side and the inductor patterns 116a, 1
15a and 114a are opposed to the open end portions, respectively.
Open-side tips of inductor patterns 111b, 112b, 113b and inductor patterns 116b, 115
b and 114b face the open end. In the second embodiment, the inductor patterns 111a to 116b are formed so as to extend inward from the left and right sides of the sheets 46 and 48, but are formed to extend in opposite directions. You may.

Inductor patterns 116a and 116b
Are connected to the extraction patterns 136a and 136b, respectively, and the extraction patterns 136a and 136b are connected to the sheet 4
It is exposed on the right side of the back side of 6,48. The inductor patterns 114a and 114b are connected to the inductor patterns 142a and 142b. The inductor patterns 142a and 142b constitute an impedance matching inductor Ls2. The inductor patterns 142a and 142b are formed together with the inductor patterns 141a and 141b, respectively, together with the lead pattern 13a.
7a and 137b. Withdrawal pattern 137
a, 137b are exposed on the left side of the front side of the sheets 46, 48.

Frequency adjusting capacitor pattern 121a
To 126a, 121b to 126b are insulating sheets 4
5 and 49 are formed at the center, and one end of each is electrically connected to the connection patterns 127a and 127b. Both ends of the connection patterns 127a and 127b are exposed to the back side and the front side of the sheets 45 and 49.

Frequency adjusting capacitor pattern 121
a, 121b are inductor patterns 111a, 11b;
The capacitor C1 is formed so as to face the tip of 1b. The capacitor C1 and the inductor L1 having a double structure constitute an LC parallel resonator Q1. The frequency-adjusting capacitor patterns 122a and 122b are opposed to the leading ends of the inductor patterns 112a and 112b.
Form 2 The capacitor C2 and the inductor L2 having a double structure constitute an LC parallel resonator Q2. The frequency adjusting capacitor patterns 123a and 123b face the tips of the inductor patterns 113a and 113b to form a capacitor C3. And the capacitor C
The LC parallel resonator Q3 is composed of the inductor L3 and the inductor L3 having a double structure.
Is configured.

Frequency adjusting capacitor pattern 124
a and 124b are inductor patterns 114, respectively.
a, a capacitor C4 is formed facing the tip of 114b. The capacitor C4 and the inductor L4 having a double structure constitute an LC parallel resonator Q4. The frequency adjusting capacitor patterns 125a and 125b face the tips of the inductor patterns 115a and 115b, respectively, and form a capacitor C5. And the capacitor C
5 and an inductor L5 having a double structure, an LC parallel resonator Q5.
Is configured. Frequency adjustment capacitor pattern 126
a, 126b are inductor patterns 116, respectively.
a, a capacitor C6 is formed opposite to the tip of 116b. The capacitor C6 and the double-structured inductor L6 constitute an LC parallel resonator Q6.

Coupling adjustment capacitor patterns 131, 1
32 denotes inductor patterns 111a to 113a, 1
A coupling capacitor Cs1 and a resonator Q2 opposing the tips of 11b to 113b and coupling the resonators Q1 and Q2.
And a resonator Q3 to form a coupling capacitor Cs2. Similarly, the coupling adjustment capacitor patterns 133, 1
34 denotes inductor patterns 114a to 116a, 1
A coupling capacitor Cs3 and a resonator Q5 opposing the distal ends of 14b to 116b and coupling the resonators Q4 and Q5.
And a resonator Q6 to form a coupling capacitor Cs4. Then, the patterns 111a to 116b and 121a to
Wide shield pattern 144 with 127b interposed
a and 144b are arranged.

Each of the sheets 42 to 51 is sequentially stacked as shown in FIG.
The laminated body 150 shown in FIG. Ground terminal electrodes G1 and G4 are formed on the left and right end surfaces of the laminate 150, respectively. A transmitting terminal electrode Tx, a receiving terminal electrode Rx, and a ground terminal electrode G2 are formed on the back side surface of the stacked body 150, and an antenna terminal electrode ANT and a ground terminal electrode G3 are formed on the near side surface. Is formed.

The lead pattern 1 is connected to the transmitting terminal electrode Tx.
35a and 135b are connected, the lead-out patterns 136a and 136b are connected to the receiving terminal electrode Rx, and the lead-out patterns 137a and 137 are connected to the antenna terminal electrode ANT.
7b is connected. The ends of the shield patterns 144a, 144b and the inductor patterns 111a to 113a, 111b to 113b are connected to the ground terminal electrode G1, and the shield patterns 144a, 144b and the connection patterns 127a, 1 are connected to the ground terminal electrode G2.
27b, the ends of the shield patterns 144a, 144b and the connection patterns 127a, 127b are connected to the ground terminal electrode G3, and the shield patterns 144a, 144b and the inductor pattern are connected to the ground terminal electrode G4. 114a to 116a, 114b
To 116b are connected. The multilayer duplexer 110 thus obtained has an equivalent circuit similar to the electric equivalent circuit shown in FIG.

In this laminated type duplexer 110,
As shown in FIG. 4, the axes of the inductors L1, L2, and L3 of the bandpass filter BPF1 are
The axis of the inductors L6, L5 and L4 of the PF2 is located substantially on the same line, and the inductors L1 to L3 and
6 are opposed to each other. Therefore, the inductors L1 to L1
The magnetic field generated by the current flowing through L3 and the inductors L4 to L4
6, the magnetic field generated by the flow of the current hardly crosses, and the electrical coupling between the inductors L1 to L3 and the inductors L4 to L6 can be minimized. As a result, it is possible to obtain the laminated duplexer 110 with less deterioration of the attenuation characteristics and less impedance shift.

[Third Embodiment, FIGS. 6 and 7] FIG. 6 shows the configuration of the laminated duplexer 160, and FIG. 7 shows an external perspective view of the duplexer 160. Duplexer 160
Is a combination of a three-stage bandpass filter BPF1 having resonators Q1 to Q3 and a three-stage bandpass filter BPF2 having resonators Q4 to Q6.

Inductor patterns 161a to 163
a, 161b to 163b are formed in a substantially left half area of the insulating sheets 46, 48. The inductor patterns 161a to 163a and 161b to 163b are arranged in a state of running in parallel from the front side of the insulating sheets 46 and 48 toward the back side. One end of each of the inductor patterns 161a to 163a and 161b to 163b is exposed to the front side of the sheets 46 and 48, and the other end is an open end.

Inductor patterns 161a, 161b
Have substantially the same shape, are stacked via the sheets 46 and 47, and constitute an inductor L1 having a double structure. Similarly, inductor patterns 162a, 162b, 163
a, 163b are also double-structured inductors L2, L
3. The axes of the inductors L1 to L3 are parallel to the direction from the front side to the back side of the insulating sheets 46 and 48.

Inductor patterns 161a, 161b
Are connected to the extraction patterns 185a and 185b, respectively, and the extraction patterns 185a and 185b are connected to the sheet 4
It is exposed on the left side of 6,48. The inductor patterns 163a and 163b are connected to the inductor patterns 191a and 191b, respectively. The inductor patterns 191a and 191b constitute an impedance matching inductor Ls1.

On the other hand, the inductor patterns 164a to 164a-1
66a, 164b to 166b are insulating sheets 46, 4
8 is formed in a substantially right half area. The inductor patterns 164a to 166a and 164b to 166b
The insulating sheets 46 and 48 are arranged so as to run in parallel from the back side to the front side. Inductor patterns 164a to 166a, 164b to 166
One end of each of b is exposed to the back side of the sheets 46 and 48, and the other end is an open end. The inductor patterns 164a and 164b are stacked via the sheets 46 and 47 to form a double-structured inductor L4. Similarly, inductor patterns 165a, 165b, 16
6a and 166b are also double-structured inductors L5 and L5, respectively.
L6.

The inductors L1 to L3 of the bandpass filter BPF1 and the inductors L4 to L6 of the bandpass filter BPF2 are arranged alternately. That is,
Inductor patterns 161a-163a, 161b-
163b and inductor patterns 164a to 166a,
164b to 166b are respectively arranged in an interdigital manner.

Inductor patterns 166a, 166b
Are connected to the extraction patterns 186a and 186b, respectively, and the extraction patterns 186a and 186b are connected to the sheet 4
It is exposed on the right side of 6,48. The inductor patterns 164a and 164b are the inductor patterns 192a,
192b. Inductor pattern 192
a and 192b constitute an impedance matching inductor Ls2. Inductor pattern 192
a and 192b are inductor patterns 191 respectively.
a, 191b, and withdrawal patterns 187a, 187
b. Leader patterns 187a, 187b
Are exposed at the center of the back side of the sheets 46 and 48.

Frequency adjusting capacitor pattern 171a
To 173a and 171b to 173b are insulating sheets 4
5 and 49 are formed in substantially the left half area, and one end of each is exposed to the back side of the sheets 45 and 49. Frequency adjusting capacitor patterns 174a to 176a, 17
4b to 176b are formed in substantially the right half area of the insulating sheets 45 and 49, and one end of each is
9 is exposed on the front side.

Frequency Adjusting Capacitor Pattern 171
a, 171b are the inductor patterns 161a, 161b;
The capacitor C1 is formed so as to face the tip of 1b. Then, a resonator Q1 is formed by the capacitor C1 and the inductor L1.
Is configured. Frequency adjustment capacitor pattern 172
a, 172b are inductor patterns 162a, 162b;
A capacitor C2 is formed facing the tip of 2b. Then, a resonator Q2 is formed by the capacitor C2 and the inductor L2.
Is configured. Frequency adjustment capacitor pattern 173
a, 173b are inductor patterns 163a, 163b;
A capacitor C3 is formed facing the tip of 3b. The capacitor C3 and the inductor L3 form a resonator Q3.
Is configured.

Frequency adjusting capacitor pattern 174
a, 174b are inductor patterns 164a, 164b;
A capacitor C4 is formed so as to face the tip of 4b. Then, a resonator Q4 is formed by the capacitor C4 and the inductor L4.
Is configured. Frequency adjustment capacitor pattern 175
a, 175b are inductor patterns 165a, 165b;
A capacitor C5 is formed so as to face the tip of 5b. The capacitor C5 and the inductor L5 form a resonator Q5.
Is configured. Frequency adjustment capacitor pattern 176
a, 176b are inductor patterns 166a, 166b;
A capacitor C6 is formed so as to face the tip of 6b. Then, a resonator Q6 is formed by the capacitor C6 and the inductor L6.
Is configured.

Coupling adjustment capacitor pattern 181, 1
82 denotes inductor patterns 161a to 163a, 1
A coupling capacitor Cs1 and a resonator Q2 opposing the distal ends of 61b to 163b and coupling the resonators Q1 and Q2.
And a resonator Q3 to form a coupling capacitor Cs2. Similarly, the coupling adjustment capacitor patterns 183, 1
84 denotes inductor patterns 164a to 166a, 1
64b to 166b, a coupling capacitor Cs3 and a resonator Q5 that couple the resonators Q4 and Q5.
And a resonator Q6 to form a coupling capacitor Cs4. Then, the patterns 161a to 163b and 171a to
Wide shield pattern 193 with 173b interposed
a, 193b are arranged, and patterns 164a to 166 are arranged.
b, 174a to 176b are interposed therebetween, and shield patterns 194a and 194b having a wide area are arranged.

Each of the sheets 42 to 51 having the above-described configuration is stacked in order as shown in FIG. 6 and integrally fired to form a laminate 200 shown in FIG. The transmission terminal electrodes Tx are respectively provided on the left and right end faces of the laminate 200.
And a receiving terminal electrode Rx. Laminate 20
The antenna terminal electrode ANT and the ground terminal electrodes G1 and G3 are formed on the side surface on the far side of 0, and the ground terminal electrodes G2 and G4 are formed on the front side surface.

The drawing pattern 1 is applied to the transmitting terminal electrode Tx.
85a and 185b are connected to the receiving terminal electrode Rx, and lead patterns 186a and 186b are connected to the receiving terminal electrode Rx.
7b is connected. The shield patterns 193a and 193b and the frequency adjustment capacitor patterns 171a to 173a and 171b to 17 are provided on the ground terminal electrode G1.
3b is connected to the ground terminal electrode G2, the shield patterns 193a and 193b and the inductor patterns 161a to 163a and 161b to 163b are connected to the ground terminal electrode G2. The ground terminal electrode G3 is connected to the shield patterns 194a and 194b. And inductor pattern 16
4a to 166a and 164b to 166b are connected to one another.
The ends of the capacitor patterns 94a, 194b and the frequency adjustment capacitor patterns 174a to 176a, 174b to 176b are connected.

In this laminated type duplexer 160,
As shown in FIG. 6, the inductors L1 to L3 of the bandpass filter BPF1 and the inductors L4 to L6 of the bandpass filter BPF2 are arranged in an interdigital manner. Here, the inductor patterns 161a to
When the length of 166b is set to λ / 4 (λ: wavelength of a desired resonance frequency), resonators Q1 to Q6 are λ / 4 resonators. In this case, the inductor patterns 161a to 161a
The current density is maximum at the grounded portion 66b, and the generated magnetic field is also maximum. However, the duplexer 160
Are the inductor patterns 161a to 161a to maximize the magnetic field.
Since the ground portions of the inductor patterns 164a to 166a and 164b to 166b are separated from the ground portions of the inductors 163a and 161b to 163b, the electrical coupling between the inductors L1 to L3 and the inductors L4 to L6 can be minimized. it can. As a result, it is possible to obtain the laminated duplexer 160 with less deterioration of the attenuation characteristics and less impedance shift.

[Other Embodiments] The multilayer filter module according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist. For example, in the above-described embodiment, the duplexer configured by combining the band-pass filters has been described as an example.In addition, a low-pass filter, a high-pass filter, and a trap circuit, or a duplexer configured by combining these different types of circuits. You may. Further, the filter module includes a module in which a plurality of filters are built in one laminated body, such as a triplexer, a diplexer, or a filter array, in addition to the duplexer. The diplexer is configured by combining, for example, a low-pass filter and a high-pass filter. The filter array includes, for example, a plurality of functionally independent bandpass filters.

In the above embodiment, all the inductors L1 to L3 of the band-pass filter BPF1 and all the inductors L4 to L6 of the band-pass filter BPF2 are made orthogonal or the like. Are arranged orthogonally, facing each other, or in an interdigital manner, it is not always necessary to make all inductors orthogonal. For example, in the case of inductors that are spaced apart and do not cause electrical coupling, if electrical coupling does not affect the electrical characteristics,
Alternatively, when electrical coupling is actively used,
Not all inductors need be orthogonal.

Further, in the above embodiment, the inductors Ls1 and Ls2 are used for impedance matching, but a capacitor may be used instead. Although the inductor patterns 61a to 66a are formed on the same insulating sheet, the inductor patterns 61a to 66a may be formed on different insulating sheets.

Further, in the above embodiment, the insulating sheets each having the conductor formed thereon are stacked and then integrally fired, but the present invention is not limited to this. As the insulating sheet, a pre-fired one may be used. Also,
The filter module may be created by a manufacturing method described below. After an insulating layer is formed from a paste-like insulating material by a method such as printing, a paste-like conductive material is applied to the surface of the insulating layer to form an arbitrary conductor. Next, a paste-like insulating material is applied over the conductor to form an insulating layer in which the conductor is embedded. Similarly, a filter module having a laminated structure can be obtained by successively applying layers.

[0067]

As is apparent from the above description, according to the present invention, since the inductor conductor has no parallel running portions, the magnetic field components generated by the respective inductors hardly cross each other. Or, even if they cross, they are only orthogonal. Therefore, electrical coupling between the inductors can be suppressed. As a result, it is not necessary to take measures such as increasing the interval between adjacent filters. It is also possible to make the interval between filters narrower than before.
The size of the multilayer filter module can be reduced.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a multilayer filter module according to the present invention.
FIG. 2 is an exploded perspective view showing the embodiment.

FIG. 2 is a perspective view showing the appearance of the multilayer filter module shown in FIG.

FIG. 3 is an electrical equivalent circuit diagram of the multilayer filter module shown in FIG.

FIG. 4 shows a second embodiment of the multilayer filter module according to the present invention.
FIG. 2 is an exploded perspective view showing the embodiment.

FIG. 5 is a perspective view showing the appearance of the multilayer filter module shown in FIG. 4;

FIG. 6 shows a third example of the multilayer filter module according to the present invention.
FIG. 2 is an exploded perspective view showing the embodiment.

FIG. 7 is an exemplary perspective view showing the appearance of the multilayer filter module shown in FIG. 6;

FIG. 8 is an exploded perspective view of a conventional multilayer filter module.

FIG. 9 is a perspective view showing the appearance of the multilayer filter module shown in FIG. 8;

[Explanation of symbols]

41, 110, 160: laminated type duplexers 42 to 51: insulating sheets 61a to 66b, 111a to 116b, 161a to 16
6b: Inductor patterns 73a to 76b, 121a to 126b, 171a to 17
6b: capacitor pattern Tx: transmitting terminal electrode Rx: receiving terminal electrode ANT: antenna terminal electrode C1 to C6: capacitor L1 to L6: inductor Q1 to Q6: resonator BPF1, BPF2: bandpass filter

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroko Nomura 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto F-term in Murata Manufacturing Co., Ltd. (reference) 5J006 HA35 HB05 HB21 JA01 JA21 KA03 LA03 LA13 NA03 NB07 NC03

Claims (4)

[Claims] 1. A plurality of filters each having at least one pair of input / output terminals and having an inductor conductor grounded at one end and open at the other end are buried in a laminate, and a plurality of filters for inductors of the adjacent filters are provided. A laminated filter module, wherein the conductor does not have a portion running in parallel over the entire length. 2. The multilayer filter module according to claim 1, wherein the inductor conductors are orthogonal to each other. 3. The multilayer filter module according to claim 1, wherein the inductor conductors face each other. 4. The inductor conductor according to claim 1, wherein the inductor conductors are arranged in an interdigital manner.
The laminated filter module as described in the above.