JPH10209707A - Laminated filter and laminated module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated filter, with which impedance matching is easily taken and an external electrode at the side face of the dielectric body is easily formed and the laminated module with a good characteristics and to which circuit components are easily mounted to a portable telephone set. SOLUTION: A dielectric constant of a dielectric layer between a resonator electrode 103 and capacitor electrodes 105, 106 is selected higher than a dielectric constant of other dielectric layers. Then a land electrode is formed to an upper face of an uppermost dielectric layer, circuit components are mounted to form a low-pass filter and a high-frequency switch circuit, and they are connected by external electrodes 110-113 provided to the side face of the dielectric body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated filter and a laminated module suitable as a duplexer for a mobile communication mobile phone.

[0002]

2. Description of the Related Art FIG. 7 shows a configuration of a conventional laminated filter. In FIG. 7, reference numeral 726 denotes a sixth dielectric layer, on which a first ground electrode 101 is provided, on the upper surface thereof, a first dielectric layer 102 is laminated, and on the upper surface, a plurality of dielectric layers are provided. Are provided. Further, a second dielectric layer 104 is stacked on the plurality of resonator electrodes 103, and a capacitor electrode including an input / output coupling capacitor electrode 705, an inter-stage coupling capacitor electrode 106, and a load capacitor electrode 107 is formed on the upper surface of the second dielectric layer 104. Is provided. Next, on the upper side of the capacitor electrode,
, A second ground electrode 109 is provided on the upper surface thereof, and a fifth dielectric layer 519 is further provided thereon. The first ground electrode 101 and the second ground electrode are via holes (not shown).
Is connected to a second ground electrode 727a provided below the sixth dielectric layer 726, and a plurality of resonator electrodes 1
One end of the third ground electrode 103 is provided below the first ground electrode 101, the second ground electrode 109, and the sixth dielectric layer 726, and is connected to the second land electrode 727b through a via hole (not shown). One end of the capacitor electrode 107 is connected to a first ground electrode 101, a second ground electrode, and a second land electrode 727 c provided below the sixth dielectric layer 726 via a via hole (not shown). I have. Further, the input / output coupling capacitor electrode 705 is connected to a second land electrode 727d provided below the sixth dielectric layer 726 via a via hole (not shown). Here, the dielectric constants of the first dielectric layer 102, the second dielectric layer 104, and the third dielectric layer 108 are equal,
Fifth dielectric layer 519 and sixth dielectric layer 519 having equal dielectric constants
Is formed higher than the dielectric constant of the dielectric layer 726 of
Further, the second land electrode 727a, the second land electrode 727b, and the second land electrode 727c are grounded to form a multilayer filter using the land electrode 727d as an input / output terminal.

At this time, since one end of the resonator electrode 103 is grounded and the other end is opened, it functions as a λ / 4 resonator 214 in the equivalent circuit shown in FIG. Resonator electrode 1
8 and the input / output coupling capacitor electrode 705 are electromagnetically coupled via the second dielectric layer 104 and function as an input / output coupling capacitor 815 shown in FIG. Similarly, resonator electrode 1
8 and the inter-stage coupling capacitor electrode 106 are electromagnetically coupled via the second dielectric layer 104 and function as an inter-stage coupling capacitor 216 shown in FIG. Similarly, the resonator electrode 1
03 and the load capacitor electrode 107 are connected to the second dielectric layer 10.
4 are coupled to each other through the electromagnetic field, and the load capacitor 2 shown in FIG.
Acting as 17 controls the resonance frequency.

Also, the two resonator electrodes are electromagnetically coupled between the electrodes to form a main transmission path and a sub transmission path between the input and output terminals, and thus operate as a band-pass filter having one attenuation pole.

FIG. 9 shows a conventional antenna duplexer with a switch. A first land electrode 520 is provided above the fifth dielectric layer 519 of the multilayer filter shown in FIG. 7, and a low-pass filter including a chip capacitor 521 and a chip inductor 522, and a chip capacitor 521, a chip inductor 522, and a chip A high frequency switch circuit including a resistor 523 and a PIN diode 524 is mounted. The input / output coupling capacitor electrode 105a is connected to the first land electrode 520a via a via hole (not shown), and the input / output coupling capacitor electrode 105b is connected to the second land electrode 828b via a via hole (not shown). The Rx terminal shown in FIG. The first land electrode 520c connected to the second land electrode 828c by a via hole (not shown) is connected to the Tx terminal, ANT1 terminal, and ANT2 shown in FIG.
Terminal, Ctl. 1 terminal and Ctl. There are two terminals.
The first ground electrode 101, the resonator electrode 103, the second ground electrode 109, and the first land electrode 520d are connected to each other by a via hole (not shown).
The first ground electrode 101, the load capacitor electrode 107, the second ground electrode 109, and the first land electrode 520e are connected to the second ground electrode via a via hole (not shown).
And the first ground electrode 101, the second ground electrode 109, and the first land electrode 520f are connected to the second land electrode 828e via holes (not shown).
The antenna connected to the land electrode 828f is a ground terminal, and the control system constitutes a 2-bit receiving-side diversity antenna duplexer with a switch.

In FIG. 10, Ctl. When a DC current is passed from one terminal to turn on the PIN diode Di1 and the PIN diode Di2, the chip capacitor C6, the chip inductor L2, and the chip capacitor C7 act as a 90-degree transfer device, and the receiving side is cut off as a high-frequency circuit.
The high frequency power input to the Tx terminal is radiated from the ANT1 terminal. Ctl. 1 terminal and Ctl. When all the PIN diodes are turned off without passing a direct current from the two terminals, the chip capacitor C6 and the chip inductor L
2. The chip capacitor C7, the chip inductor L3 and the chip capacitor C8 act as a transmission line and
The high-frequency power received at the NT1 terminal is output to the Rx terminal. Ctl. When a DC current is passed from the two terminals to turn on the PIN diode Di3 and the PIN diode Di2, the chip capacitor C7 and the chip inductor L3
The chip capacitor C8 acts as a 90-degree transfer device, the transmission side is cut off as a high-frequency circuit, and the high-frequency power received at the ANT2 terminal is output to the Rx terminal.

As described above, by performing 2-bit control, an antenna duplexer with a switch is formed in which the loss is small during transmission and the current consumption becomes zero during reception from ANT1.

[0008]

However, in the multilayer filter having the above structure, the impedance matching between the input and output terminals becomes insufficient because the dielectric constant between the upper and lower ground electrodes is high. In addition, there is a problem that the manufacturing process becomes complicated because the dielectric layer having a high dielectric constant is depressed inward due to the difference in the contraction process of the dielectric and thus the external electrode cannot be formed.

In the duplexer with a switch having the above-described configuration, the dielectric layer having a low dielectric constant is made thinner in order to improve the characteristics of the multilayer filter and to reduce the height, so that the distance between the land electrode and the ground electrode is reduced. The stray capacitance increases and the characteristics deteriorate. In addition, there is a problem that the strength of the dielectric itself is low, which is disadvantageous at the time of mounting.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a multilayer filter in which impedance matching is easily achieved by changing the dielectric constant of a part of the dielectric layer between the upper and lower ground electrodes and the external electrodes are easily formed with flat side surfaces. Further, it is an object of the present invention to provide a laminated module that reduces stray capacitance by changing a ground electrode and has high strength and is suitable for mounting circuit elements.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, the dielectric constant of a dielectric layer between a resonator electrode and a capacitor electrode is higher than that of another dielectric layer. It is provided with such a configuration.

As a result, a multilayer filter in which the impedance of input / output terminals can be easily matched and a high-strength dielectric layer occupies most of the layers, and a multilayer module which has a small stray capacitance between the electrodes and is suitable for mounting circuit elements are realized. be able to.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a first ground electrode, a first dielectric layer laminated on an upper surface of the first ground electrode, the first ground electrode, A plurality of resonator electrodes provided on an upper surface of the dielectric layer; a second dielectric layer laminated on the upper surface of the plurality of resonator electrodes;
A capacitor electrode provided on the upper surface of the second dielectric layer, a third dielectric layer laminated on the upper surface of the capacitor electrode, and a second electrode provided on the upper surface of the third dielectric layer. A multilayer filter comprising a ground electrode, wherein
A multilayer filter in which the dielectric constant of the dielectric layer is higher than the dielectric constants of the first and third dielectric layers. The characteristic impedance of the plurality of resonator electrodes and capacitor electrodes increases, and the This has the effect of making it easier to achieve impedance matching.

According to a second aspect of the present invention, there is provided an external electrode having a load capacitor electrode and at least one of a first ground electrode and a second ground electrode provided on a dielectric side surface. 2. The multilayer filter according to claim 1, wherein the filter is connected by a via hole, and has an effect of stabilizing a potential of a ground electrode and a load capacitor electrode and improving characteristics.

According to a third aspect of the present invention, a fourth dielectric layer is laminated between a first dielectric layer and a plurality of resonator electrodes, and the fourth dielectric layer is laminated. 3. The multilayer filter according to claim 1, wherein the permittivity is equal to the permittivity of the second dielectric layer, and the effective permittivity of the plurality of resonator electrodes is increased, so that the length of the resonator electrodes can be reduced. Has an action.

According to a fourth aspect of the present invention, the input / output coupling capacitor electrode and the interstage coupling capacitor electrode among the capacitor electrodes are provided on the upper surface of the first dielectric layer. This has the effect of increasing the degree of freedom in designing the capacitor electrode and the effect of shortening the length of the resonator electrode because the load capacitor electrode can be increased.

The fifth aspect of the present invention is the first aspect of the present invention.
A second aspect of the multilayer filter according to any one of claims 4 to 4.
A fifth dielectric layer is laminated on the upper surface of the ground electrode, and the dielectric constant of the fifth dielectric layer is made equal to the dielectric constants of the first dielectric layer and the third dielectric layer. This is a laminated module in which land electrodes are provided on the upper surface of the dielectric layer, and a circuit element is mounted on the land electrodes, and has an effect of enabling a module to be manufactured in an area occupied by the laminated filter.

According to a sixth aspect of the present invention, at least a part of the land electrode and at least a part of the electrode provided in the dielectric are connected by an external electrode or a via hole provided on a side surface of the dielectric. Item 5. The stacked module according to Item 5, which has an effect that a mounting substrate is not required because of the integrated module.

According to a seventh aspect of the present invention, there is provided the laminated module according to the sixth aspect, wherein the low-pass filter and the high-frequency switch circuit are constituted by circuit elements mounted on the land electrodes. It has the function of having a function.

According to the invention described in claim 8 of the present invention, the second portion of the portion opposed to the load capacitor via the third dielectric layer is provided.
8. The stacked module according to claim 7, wherein said ground electrode is eliminated, and has an effect of reducing stray capacitance between a land electrode and a second ground electrode to improve characteristics.

According to a ninth aspect of the present invention, there is provided a parallel plate electrode which faces one of the first to fourth dielectric layers and is provided on the other dielectric and the side of the dielectric. 8. The multilayer module according to claim 7, wherein said external module or via hole is used to form a capacitor, and has a function of reducing the number of circuit elements to be mounted.

According to a tenth aspect of the present invention, there is provided the laminated module according to the ninth aspect, wherein one of the parallel plate electrodes is a first ground electrode or a second ground electrode, and the number of stacked electrodes is reduced. It has the effect of doing.

An eleventh aspect of the present invention is the laminated module according to the ninth aspect, wherein one of the parallel plate electrodes is a load capacitor electrode of the capacitor electrodes.
It has the function of reducing the number of electrodes to be stacked.

According to a twelfth aspect of the present invention, there is provided the laminated module according to the seventh aspect, wherein the inductor in the circuit element is a microstrip line provided on the upper surface of the fifth dielectric layer. It has the effect of reducing points.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. Embodiment 1 FIG. 1 shows a laminated filter according to Embodiment 1 of the present invention. In FIG. 1, two resonator electrodes 103 having one end grounded are formed on the upper surface of a first dielectric layer 102 having a first ground electrode 101 formed on the lower surface, and a second resonator electrode 103 is formed on the upper surface of the resonator electrode 103. A dielectric layer 104 is laminated, and two input / output coupling capacitor electrodes 105 and an interstage coupling capacitor electrode 10 are formed on the upper surface of the second dielectric layer 104.
6 and a capacitor electrode layer including a load capacitor electrode 107 having one end grounded, a third dielectric layer 108 laminated on the upper surface of the capacitor electrode layer, and a third dielectric layer 1
08, the second ground electrode 109 is formed to form a multilayer filter. The dielectric constant of the second dielectric layer 104 is equal to that of the first dielectric layer 102 and the third dielectric layer 102 having the same dielectric constant.
Is higher than the dielectric constant of the dielectric layer 108.

These dielectric layers are formed by laminating dielectric green sheets, and these electrodes are formed by screen printing.

One end of the resonator electrode 103, the first ground electrode 101 and the second ground electrode 109 are connected by an external electrode 110 provided on the side surface of the dielectric, and are grounded. First ground electrode 1
01 and the second ground electrode 109 are connected and grounded by an external electrode 110 provided on the dielectric side surface, and the first ground electrode 101 and the second ground electrode 109 are provided on the dielectric side surface. Connected with the external electrode 112 and grounded. The input / output coupling capacitor electrode 105 is connected to the external electrode 113 provided on the side surface of the dielectric.

The operation of the multilayer filter configured as described above will be described below. Since one end of the resonator electrode 103 of the present embodiment is grounded, it acts as the λ / 4 resonator 214 of the equivalent circuit in FIG. 2, and the resonator electrode 103 and the input / output coupling capacitor electrode 105 are electromagnetically coupled. 2, the resonator electrode 103 and the inter-stage coupling capacitor electrode 106 are electromagnetically coupled to act as the inter-stage coupling capacitor 216 in FIG. 2, and the resonator electrode 103 and the load capacitor electrode 215 in FIG. An electromagnetic coupling 107 acts as a load capacitor 217 in FIG. 2 to control the resonance frequency. Further, since the two resonator electrodes 103 are electromagnetically coupled between the resonators, at this time, the main transmission path and the sub transmission path are provided between the input and output terminals, and the filter operates as a band-pass filter having one attenuation pole. . At this time, the input / output coupling capacitor electrode 1
05 has a low effective dielectric constant because it is sandwiched between two types of dielectric layers having different dielectric constants. Therefore, the characteristic impedance of the input / output coupling capacitor electrode 105 in a portion that does not overlap with the resonator electrode 103 acting as a transmission line is increased, and impedance matching at the input / output terminals is easily achieved. In addition, since the thickness of the high-strength dielectric layer is increased, the side surfaces of the dielectric are flattened, so that the external electrodes can be easily formed, and the resistance to thermal shock can be increased.

As described above, according to the present embodiment, it is possible to provide a laminated filter having characteristics superior to those of the conventional laminated filter and having high strength.

In this embodiment, the load capacitor electrode and the second ground electrode are only grounded. However, they may be connected by a via hole formed in the third dielectric layer. . In this case, there is an effect that the potentials of the load capacitor electrode and the second ground electrode are stabilized and the filter characteristics are improved.

(Embodiment 2) FIG. 3 shows a laminated filter according to Embodiment 2 of the present invention. Embodiment 2 shown in FIG.
Has basically the same configuration as that of the first embodiment shown in FIG. 1, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, a fourth dielectric layer 318 is laminated between the first dielectric layer 102 and the two resonator electrodes 103, and the dielectric constant of the fourth dielectric layer 318 is set to The structure is the same as that of the first embodiment except that it is equal to the second dielectric layer 104.

The operation of the multilayer filter configured as described above will be described below. In the first embodiment, the laminated filter is configured by increasing the dielectric constant only of the second dielectric layer laminated between the two resonator electrodes and the capacitor electrode layer. The dielectric constant becomes lower, and the length of the resonator for obtaining a desired resonance frequency becomes longer.

In this embodiment, since the resonator electrode is sandwiched between dielectric layers having a high dielectric constant, the effective dielectric constant of the resonator is increased, the length of the resonator is shortened, and the size of the multilayer filter can be reduced.

In the present embodiment, the two input / output coupling capacitor electrodes, the interstage coupling capacitor electrode, and the load capacitor electrode are all formed in the same layer. However, as shown in FIG. To the upper surface of the second dielectric layer or the upper surface of the second dielectric layer. In this case, there is an effect that the degree of freedom in designing the capacitor electrode is improved.

(Embodiment 3) FIG. 5 shows a laminated module according to Embodiment 3 of the present invention. The stacked module of the third embodiment shown in FIG. 5 has basically the same configuration as that of the second embodiment shown in FIG. 4, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted. I do.

In this embodiment, a fifth dielectric layer 519 is laminated on the upper surface of the second ground electrode, and the fifth dielectric layer 5
19, a first land electrode 520 is formed on the upper surface, and a low-pass filter including a chip capacitor 521 and a chip inductor 522, a chip capacitor 521, a chip inductor 522, a chip resistor 523, and a PIN diode 524 are formed on the first land electrode 520. A high frequency switch circuit consisting of The input / output coupling capacitor electrode 405a of the multilayer filter and the first ground electrode 520a are connected by an external electrode 525a provided on the dielectric side surface, and the input / output coupling capacitor electrode 405b and the external electrode 525b provided on the dielectric side surface are connected. Connect to the Rx terminal shown in FIG. Further, the first land electrode 520c is connected to an external electrode 525c provided on the side surface of the dielectric, and these are connected to the Tx terminal, ANT1 terminal, ANT2 terminal, C
tl. 1 terminal and Ctl. There are two terminals. Also the first
Ground electrode 101, two resonator electrodes 103 and the second
The ground electrode 109 and the first land electrode 520d are connected by an external electrode 525d provided on the side surface of the dielectric, the first ground electrode 101 and the load capacitor electrode 1
07, the second ground electrode 109 and the first land electrode 5
20e connected by an external electrode 525e provided on the side surface of the dielectric, the first ground electrode 101 and the second
The ground electrode and the first land electrode 520f are connected by an external electrode 525f provided on the side surface of the dielectric, and the ground electrode is used as a ground terminal. With this configuration, this embodiment functions as an antenna duplexer with a switch having a 2-bit control system in which the low-pass filter and the multilayer filter are integrated.

As described above, according to this embodiment, the stray capacitance is reduced as compared with the conventional duplexer with switch, so that a module having good characteristics of the low-pass filter and the multilayer filter can be obtained. Since the strength of the module itself is also increased, it is possible to provide a laminated module in which circuit elements can be easily mounted.

In this embodiment, the second ground electrode is formed so as to cover all the resonator electrodes.
This may eliminate the second ground electrode at a portion facing the load capacitor electrode via the third dielectric layer. In this case, since the distance from the first land electrode to the second ground electrode is increased and the stray capacitance is reduced, there is an effect that the characteristics of the low-pass filter and the high-frequency switch circuit are improved.

Further, in the present embodiment, the second ground electrode and the load capacitor electrode are grounded by the external electrodes provided on the side surfaces of the dielectric, but preferably, the via holes provided in the third dielectric layer are provided. It is desirable to connect the second ground electrode and the load capacitor electrode. In this case, since the potential of the shield electrode is stabilized, there is an effect that the characteristics of the multilayer filter do not deteriorate.

Further, in this embodiment, a capacitor is mounted as a circuit element to constitute a low-pass filter and a high-frequency switch circuit, but this is equivalent to the first to fourth dielectric layers. A parallel plate electrode facing either of them may be formed and connected by an external electrode or a via hole provided on the side surface of the dielectric. In this case, since the number of circuit elements to be mounted is reduced, there is an effect of reducing the price of the laminated module.

Preferably, one of the parallel plate electrodes is a first ground electrode or a second ground electrode. In this case, there is an effect that the number of capacitor electrodes to be formed is reduced and the manufacturing process can be simplified.

Preferably, one of the parallel plate electrodes is a load capacitor electrode. In this case, the number of capacitor electrodes to be formed is reduced, and the manufacturing process is simplified. In addition, the other opposing electrode can be formed on either the second dielectric layer or the third dielectric layer. This has the effect of increasing the degree of freedom in design.

In this embodiment, an inductor is mounted as a circuit element for forming a low-pass filter and a high-frequency switch circuit. You may comprise a strip line. In this case, since the number of circuit elements to be mounted is reduced, there is an effect of reducing the price of the laminated module.

Preferably, the microstrip line is a strip line formed on any one of the first to fourth dielectric layers. In this case, since the characteristic impedance of the line is increased and the inductance value is increased, there is an effect that the degree of freedom in designing the inductor is increased.

The Tx terminal, A
NT1 terminal, ANT2 terminal, Ctl. One terminal, and C
tl. The two terminals may be arranged on any of the first land electrodes 520c. In this case, there is an effect that the degree of freedom in designing the second land electrode is increased.

Preferably, Tx terminal, Rx terminal and AN
It is desirable that the T1 terminal and the ANT2 terminal are respectively arranged on the same side surface of the laminated module. In this case, there is an effect that a stacked module that can be easily mounted on a mobile phone terminal can be realized.

[0048]

As described above, according to the present invention, the dielectric constant of the dielectric layer between the resonator electrode and the capacitor electrode of the multilayer filter is made higher than the dielectric constant of the other dielectric side.
A multilayer filter can be realized in which impedance matching can be easily achieved and external electrodes on the side surfaces of the dielectric can be easily formed. In addition, it is possible to realize a laminated module that has small stray capacitance between the land electrode and the ground electrode, has good characteristics, and can easily mount circuit elements.

[Brief description of the drawings]

FIG. 1A is a perspective view of a multilayer filter according to Embodiment 1 of the present invention, and FIG.

FIG. 2 is an equivalent circuit diagram of the multilayer filter realized in the first embodiment of the present invention.

3A is a perspective view of a multilayer filter according to Embodiment 2 of the present invention. FIG. 3B is an exploded perspective view of the same.

4A is a perspective view of another example of the multilayer filter according to Embodiment 2 of the present invention. FIG. 4B is an exploded perspective view of the same.

FIG. 5 is an exploded perspective view of a laminated module according to Embodiment 3 of the present invention.

FIG. 6 is an equivalent circuit diagram of an antenna duplexer with a switch realized in Embodiment 3 of the present invention.

FIG. 7 is an exploded perspective view of a conventional multilayer filter.

FIG. 8 is an equivalent circuit diagram of the conventional example.

FIG. 9 is an exploded perspective view of a conventional antenna duplexer with a switch.

FIG. 10 is an equivalent circuit diagram of the conventional example.

[Explanation of symbols]

 Reference Signs List 101 first ground electrode 102 first dielectric layer 103 resonator electrode 104 second dielectric layer 105 input / output coupling capacitor electrode 106 interstage coupling capacitor electrode 107 load capacitor electrode 108 third dielectric layer 109 second Ground electrode 110 External electrode 111 External electrode 112 External electrode 113 External electrode

Claims (12)

[Claims] A first ground electrode; a first dielectric layer laminated on an upper surface of the first ground electrode; and a plurality of resonators provided on the upper surface of the first dielectric layer. An electrode, a second dielectric layer laminated on the upper surface of the plurality of resonator electrodes, a capacitor electrode provided on the upper surface of the second dielectric layer, and a second dielectric layer laminated on the upper surface of the capacitor electrode. A multilayer filter comprising a third dielectric layer and a second ground electrode provided on an upper surface of the third dielectric layer, wherein the dielectric constant of the second dielectric layer is set to the first and second dielectric layers. 3
A dielectric filter having a dielectric constant higher than that of the dielectric layer. 2. The method according to claim 1, wherein the load capacitor electrode of the capacitor electrode and at least one of the first ground electrode and the second ground electrode are connected by an external electrode or a via hole provided on a dielectric side surface. Item 7. The multilayer filter according to Item 1. 3. A fourth dielectric layer is laminated between the first dielectric layer and the plurality of resonator electrodes, and the dielectric constant of the fourth dielectric layer is set to a value equal to that of the second dielectric layer. 3. The multilayer filter according to claim 1, wherein the dielectric constant is equal to the dielectric constant. 4. The multilayer filter according to claim 3, wherein the input / output coupling capacitor electrode and the interstage coupling capacitor electrode among the capacitor electrodes are provided on the upper surface of the first dielectric layer. 5. A fifth dielectric layer is laminated on the upper surface of the second ground electrode of the multilayer filter according to claim 1, and a dielectric constant of the fifth dielectric layer is set to be lower than the first dielectric layer. First
Equal to the dielectric constant of the dielectric layer and the third dielectric layer,
A laminated module comprising a land electrode provided on an upper surface of the fifth dielectric layer, and a circuit element mounted on the land electrode. 6. The laminate according to claim 5, wherein at least a part of the land electrode and at least a part of the electrode provided in the dielectric are connected by an external electrode or a via hole provided on a side surface of the dielectric. module. 7. The laminated module according to claim 6, wherein the low-pass filter and the high-frequency switch circuit are constituted by circuit elements mounted on the land electrodes. 8. The multilayer module according to claim 7, wherein a portion of the second ground electrode facing the load capacitor electrode via the third dielectric layer is omitted. 9. A capacitor formed by forming a parallel plate electrode facing one of the first to fourth dielectric layers and connecting the other electrode to an external electrode or a via hole provided on the side surface of the dielectric. The laminated module according to claim 7, wherein: 10. The laminated module according to claim 9, wherein one of the parallel plate electrodes is a first ground electrode or a second ground electrode. 11. The laminated module according to claim 9, wherein one of the parallel plate electrodes is a load capacitor electrode of the capacitor electrodes. 12. The laminated module according to claim 7, wherein the inductor among the circuit elements is a microstrip line provided on or inside the fifth dielectric.