JPH05335804A - Lamination type dielectric filter - Google Patents

Abstract

PURPOSE:To obtain the small-sized lamination dielectric filter with a small occupied area in the case of mounting. CONSTITUTION:Resonance elements 21, 22, 23, 24 are formed respectively to right sides of dielectric layers 11, 12, 13, 14. Moreover, electrodes 31, 32, 33, 34 whose one end is connected to ground electrode and whose other end is opposite respectively to the resonance elements 21, 22, 23, 24 are formed respectively. The dielectric layers 11, 12, 13, 14 and a dielectric layer 15 are laminated to form the filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated dielectric filter, and more particularly to a high frequency circuit filter used in a high frequency circuit radio equipment such as a mobile phone and a laminated dielectric filter used in an antenna duplexer.

[0002]

2. Description of the Related Art FIGS. 35 and 36 are a schematic development view and a perspective view of a laminated dielectric filter proposed by the present inventors.

In this laminated dielectric filter, as shown in FIG. 35, first, a quarter-wave stripline resonator whose one end is connected to a ground electrode 70 described later is formed on the surface of the dielectric layer 11. Resonant elements 21 to 24 are formed at predetermined intervals, and one end of the resonant elements 21 to 24 is connected to the ground electrode 70, and the other end is separated from the open ends of the resonant elements 21 to 24 by a predetermined distance. Electrodes 31 to 34 facing each other are formed on the surface of the dielectric layer 11 to inductively couple between the resonant elements 21 to 24, respectively.
On the surface of the dielectric layer 12 that is laminated on the dielectric layer 12, the input electrode 41 that overlaps a part of the input-side resonant element 21 with the dielectric layer 12 interposed therebetween and the output-side resonant element 24 that sandwiches the dielectric layer 12 therebetween.
An output electrode 42 overlapping a part of the dielectric layer 12
The dielectric layer 13 is laminated on top to form a laminated dielectric filter body.

Next, as shown in FIG. 36, ground electrodes 70 are formed on the front and back surfaces of the laminated dielectric filter body and on the side surfaces excluding the input terminal portion 61 and the output terminal portion 62.
An input terminal 51, which is insulated from the ground electrode 70 and is connected to the input electrode 41, is formed in the input terminal portion 61 formed on the side surface of the laminated dielectric filter body, and similarly formed on the side surface of the laminated dielectric filter body. The output terminal portion 62 is formed with an output terminal 52 which is insulated from the ground electrode 70 and connected to the output electrode 42.

An electrically equivalent circuit of the laminated dielectric filter shown in FIGS. 35 and 36 is as shown in FIG. Figure 3
In FIG. 7, reference numeral 111 is a resonance element 21 and an input electrode 41.
Between the resonance element 24 and the output electrode 42, reference numerals 121 to 124 respectively indicate the capacitance between the resonance element 21 and the electrode 31, and the resonance element 22 and the electrode. Capacitance between 32, resonance element 23 and electrode 3
3, capacitance between the resonance element 24 and the electrode 34, reference numeral 131 is an inductance indicating distributed coupling between the resonance element 21 and the resonance element 22, and reference numeral 132.
Is an inductance indicating the distributed coupling between the resonant element 22 and the resonant element 23, and reference numeral 133 is an inductance indicating the distributed coupling between the resonant element 23 and the resonant element 24, which constitutes a bandpass filter. There is. The capacitances 211, 221, 231, and 241 of the parallel resonance circuit and the inductances 212, 222, 232, and 242 are capacitances and inductances when the resonance elements 21, 22, 23, and 24 are equivalently converted, respectively.

[0006]

However, in portable telephone terminals and the like in which such a bandpass filter is used, there is an increasing demand for miniaturization, and accordingly, the bandpass filter used in the inside is also required. Although there is a strong demand for downsizing and reduction of the occupied area, in the laminated dielectric filter having the above-described structure, the resonant elements 21 to 24 are arranged in parallel in the same plane in the horizontal direction. Therefore, the lateral width of the multilayer dielectric filter becomes large, and it is difficult to reduce the occupied area. Especially, when the lateral widths of the resonant elements 21 to 24 themselves were increased in order to improve the Q characteristic of the filter, and when the number of resonant elements was increased to improve the attenuation characteristic of the filter.

Therefore, an object of the present invention is to provide a laminated dielectric filter which is miniaturized and occupies a small area when mounted.

[0008]

According to the present invention, in a laminated dielectric filter in which a plurality of resonant elements are laminated,
The input terminal and the output terminal of the multilayer dielectric filter are configured such that, when the multilayer dielectric filter is mounted on a mounting board, the main surface of the resonant element is substantially perpendicular to the mounting board. A laminated dielectric filter having the above-mentioned structure is obtained.

Further, according to the present invention, in the laminated dielectric filter in which a plurality of resonant elements are laminated, the input terminal and the output terminal of the laminated dielectric filter are substantially in the laminating direction of the plurality of resonant elements. A first portion provided on a surface of the multilayer dielectric filter in a vertical direction, and a first portion provided on a surface of the multilayer dielectric filter in a direction substantially parallel to a stacking direction of the plurality of resonant elements, A laminated dielectric filter having the first portion and the second portion connected to the first portion is obtained.

Furthermore, according to the present invention, in a laminated dielectric filter in which a plurality of resonant elements are laminated, the laminated dielectric filter is arranged in a direction substantially perpendicular to the laminating direction of the plurality of resonant elements. An input electrode that is provided and is electrostatically coupled to the input end side resonant element of the plurality of resonant elements, and is provided on the surface of the multilayer filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, An input terminal connected to the input electrode, an output electrode provided in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, and electrostatically coupled to the output end side resonant elements of the plurality of resonant elements, A multilayer dielectric filter, comprising: an output terminal provided on the surface of the multilayer filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, the output terminal connected to the output electrode. Is obtained.

Further, according to the present invention, in a laminated dielectric filter in which a plurality of resonant elements are laminated, it is provided on the surface of the laminated dielectric filter in a direction substantially perpendicular to the laminating direction of the plurality of resonant elements. The input terminal is connected via the via hole and the input electrode electrostatically coupled to the input end side resonant element of the plurality of resonant elements or via the input end side resonant element and the via hole of the plurality of resonant elements. An output terminal, which is directly connected and is provided on the surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, is electrostatically coupled to the output end side resonant element of the plurality of resonant elements. A multilayer dielectric filter is obtained, which is characterized in that it is connected to an output electrode via a via hole or directly connected to an output end side resonant element of the plurality of resonant elements via a via hole. That.

[0012]

According to the present invention, when the laminated dielectric filter has the input terminals and the output terminals of the laminated dielectric filter mounted on the mounting substrate, the main surfaces of the plurality of resonant elements are mounted on the mounting substrate. Since it is configured to be substantially vertical, the area occupied when mounted can be reduced.

Further, in the present invention, the input terminal and the output terminal of the laminated dielectric filter are provided on the surface of the laminated dielectric filter in a direction substantially perpendicular to the laminating direction of the plurality of resonant elements. And a second portion which is provided on the surface of the multilayer dielectric filter in a direction substantially parallel to the stacking direction of the plurality of resonant elements and which is connected to the first part. Therefore, by mounting the laminated dielectric filter on the mounting substrate using the second portions of the input terminal and the output terminal, the main surface of the resonant element becomes substantially vertical to the mounting substrate. As a result, the occupied area when mounted can be reduced.

Further, in the present invention, since the input terminal and the output terminal are provided on the surface of the multilayer filter in the direction substantially perpendicular to the stacking direction of the plurality of resonant elements, the input terminal and the output terminal are mounted. By mounting the multilayer dielectric filter on the mounting board so that it is almost perpendicular to the surface of the board, the main surface of the resonant element can be made almost perpendicular to the mounting board, and the occupation when mounted Not only can the area be reduced, but in the present invention, the input electrode connected to the input terminal is connected to the input end side resonance element of the plurality of resonance elements in a direction substantially perpendicular to the stacking direction of the plurality of resonance elements. An output electrode that is provided by being electrostatically coupled and is connected to the output terminal is electrostatically coupled to the output end side resonance element of the plurality of resonance elements in a direction substantially perpendicular to the stacking direction of the plurality of resonance elements. Since the distance between the input end side resonant element and the input electrode and the distance between the output end side resonant element and the output electrode can be reduced, the capacitance of the capacitance formed between them can be reduced. The value can be increased, ripple can be reduced, and the thickness of the dielectric layer between the input-end resonant element and the output-end resonant element and the ground electrode provided on the surface of the multilayer filter can be reduced. Since it can be kept thick, it is possible to prevent the Q of the filter from decreasing.

Further, in the present invention, since the input terminal and the output terminal are provided on the surface of the multilayer filter in the direction substantially perpendicular to the stacking direction of the plurality of resonant elements, the input terminal and the output terminal are mounted. By mounting the multilayer dielectric filter on the mounting board so that it is substantially perpendicular to the surface of the board, the main surface of the resonant element can be made substantially perpendicular to the mounting board. Not only can the area be reduced, but further, in the present invention,
An input electrode in which an input terminal provided on the surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements is electrostatically coupled to the input end side resonant element of the plurality of resonant elements. And a surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, which is connected via a via hole or directly connected to the input end side resonant element of the plurality of resonant elements through a via hole. An output terminal provided on the output end side resonant element of the plurality of resonant elements and an output electrode electrostatically coupled to the output electrode via a via hole, or the output end side resonant element of the plurality of resonant elements and a via hole. Since it is directly connected via the input terminal, the terminal for connecting the input electrode and the input terminal and the terminal for connecting the output electrode and the output terminal or the input end side resonant element and the input terminal are connected. Since it is not necessary to provide terminals for connecting the output end side resonant element and the output terminal on the lower surface of the laminated dielectric filter, the terminals formed on these lower surfaces can be eliminated or made smaller, so that the laminated type It is possible to solve the problem that when the dielectric filter is mounted on the mounting substrate, these terminals come into contact with the mounting substrate and affect the characteristics of the filter.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the laminated dielectric filter of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic development view of the first embodiment of the laminated dielectric filter of the present invention, FIG. 2 is a perspective view of this embodiment, and FIG. 3 is a bottom view of this embodiment. 4 is shown in FIG.
6 is a sectional view taken along line XX of FIG.

As shown in FIG. 1, a ground electrode 7 to be described later.
0 is formed on the right side surface of the dielectric layer 11 to form a resonator element 21 having one end connected to 0 and forming a quarter-wavelength stripline resonator, and one end is connected to a ground electrode 70 described later, and An electrode 31 facing the resonance element 21 is formed on the right side surface of the dielectric layer 11 with the other end thereof being separated from the open end of the resonance element 21 for a predetermined period. The resonance element 21 is the resonance element on the input end side. The ground electrode 70 and the input terminal 511 are formed later on the left side surface of the dielectric layer 11, and the ground electrode 70 and the input terminal 512 are formed later on the lower surface of the dielectric layer 11.

A resonance element 22 having one end connected to a ground electrode 70, which will be described later, and forming a quarter-wave type stripline resonator is formed on the right side surface of the dielectric layer 12, and one end thereof is ground, which will be described later. An electrode 32 is formed on the right side surface of the dielectric layer 12 that is connected to the electrode 70 and has the other end thereof separated from the open end of the resonant element 22 for a predetermined period of time and facing the resonant element 22.

A resonance element 23, one end of which is connected to a ground electrode 70 to be described later and which constitutes a quarter-wavelength stripline resonator, is formed on the right side surface of the dielectric layer 13, and one end thereof is ground to be described later. An electrode 33, which is connected to the electrode 70 and whose other end is separated from the open end of the resonant element 23 by a predetermined distance and faces the resonant element 23, is formed on the right side surface of the dielectric layer 13.

A resonance element 24, one end of which is connected to a ground electrode 70 described later and which constitutes a quarter-wave stripline resonator, is formed on the right side surface of the dielectric layer 14, and one end of which is ground described later. An electrode 34, which is connected to the electrode 70 and has the other end isolated from the open end of the resonant element 24 for a predetermined period of time and facing the resonant element 24, is formed on the right side surface of the dielectric layer 14. The resonance element 24 is the resonance element on the output end side.

The dielectric layer 15 having the ground electrode 70 and the output terminal 521 formed on the right side and the ground electrode 70 and the output terminal 522 formed on the lower surface is laminated on the right side of the dielectric layer 14 to form a dielectric. Layers 11, 12, 13, 14, 1
5 are integrally formed to form a laminated body 500.

As shown in FIGS. 2 and 3, the upper surface of the laminated body 500, the side surface excluding the input terminal portion 611 and the output terminal portion 621,
The ground electrode 70 is formed on the lower surface excluding the input terminal portion 612 and the output terminal portion 622. Further, in the input terminal portion 611 on the side surface of the laminated body 500, the input terminal 511 which is insulated from the ground electrode 70 and faces the resonance element 21 is formed. An input terminal 512, which is insulated from the ground electrode 70 and connected to the input terminal 511, is also formed in the input terminal portion 612 on the lower surface of the laminated body 500. Similarly, an output terminal 521 that is insulated from the ground electrode 70 and the input terminals 511 and 512 and faces the resonance element 24 is formed in the output terminal portion 621 on the side surface of the multilayer body 500. The output terminal 522, which is insulated from the ground electrode 70 and the input terminals 511 and 512 and is connected to the output terminal 521, is also formed in the output terminal portion 622 on the lower surface of the laminated body 500.

The input terminal 51 thus provided on the side surface
Since the input terminal 512 and the output terminal 522, which are respectively connected to the output terminal 1 and the output terminal 521, are provided on the lower surface of the laminated body 500, when the filter is mounted with the lower surface facing down, the structure is suitable for surface mounting. There is.

There is an overlapping portion between the resonance element 21 and the input terminal 511 with the dielectric layer 11 interposed therebetween, and the overlapping portion including the dielectric layer 11 is electrostatically coupled. This capacitance is designated as capacitance 111. Resonant element 2
4 and the output terminal 521 also have an overlapping portion with the dielectric layer 15 interposed therebetween, and the overlapping portion including the dielectric layer 15 is electrostatically coupled. This capacitance is designated as capacitance 112.

Further, the resonance elements 21, 22, 23, 24
Capacitances 121, 122, 123, and 124 are formed between the open ends of the electrodes and the electrodes 31, 32, 33, and 34, respectively. Then, these capacitances 121 to 124
The presence of the resonance element 21 and the resonance element 22
Is based on the inductance 131, and the resonance elements 22 and 23 are based on the inductance 132.
3 and the resonance element 24 are respectively coupled by the inductance 133 to form a combline type filter.

FIG. 5 shows an equivalent circuit of the laminated dielectric filter constructed as described above. This equivalent circuit is the same as FIG. 31 which is the equivalent circuit of the laminated dielectric filter shown in FIGS. 29 and 30, and it can be seen that the bandpass filter is formed also in this embodiment.

In order to construct such a four-stage bandpass filter, in the structures of FIGS. 29 and 30, the resonant elements 21 to 24 are horizontally arranged side by side.
Although the lateral width is large and the occupied area is large at the time of mounting, in this embodiment, even when the same four-stage bandpass filter is configured, the resonant elements are arranged vertically so that they are arranged in parallel. The width of the filter is significantly reduced, and the area occupied by the mounting is also significantly reduced.

Further, the input terminal 511 and the output terminal 521 are located with the resonant elements 21 to 24 interposed therebetween. Therefore, the input terminal 511 and the output terminal 521 are connected to the resonance element 21.
24 to 24, the stray capacitance between the input terminal 511 and the output terminal 521 is almost eliminated. As a result, the attenuation characteristic of the bandpass filter is also improved.

Next, a method of manufacturing the laminated dielectric filter of the first embodiment will be described.

The present laminated dielectric filter has resonance elements 21 to 21.
24, since the electrodes 31 to 34 are completely built in the dielectric, it is desirable to use the resonant elements 21 to 24 and the electrodes 31 to 34 with low loss and low specific resistance. Alternatively, it is preferable to use a Cu-based conductor.

As the dielectric to be used, a ceramic dielectric which is highly reliable and has a large dielectric constant εγ and which can be downsized is preferable.

As a manufacturing method, a conductor paste is applied to a ceramic powder compact to form an electrode pattern, the compacts are laminated and fired to densify, and a conductor is laminated therein. It is desirable to integrate the ceramic dielectric with the ceramic dielectric.

When Ag-based or Cu-based conductors are used, the melting points of these conductors are low and it is difficult to co-fire with ordinary dielectric materials. Therefore, their melting points (1100 ° C. or less) are used. It is necessary to use a dielectric material that can be fired at lower temperatures. In addition, due to the characteristics of the device as a microwave filter, the temperature characteristic (temperature coefficient) of the resonance frequency of the formed parallel resonance circuit is ± 50 ppm / ° C.
The following dielectric materials are preferred. Examples of such a dielectric material include glass-based materials such as a mixture of cordierite-based glass powder and TiO ₂ powder and Nd ₂ Ti ₂ O ₇ powder, and BaO—TiO ₂ —Re ₂ O.
_3- Bi ₂ O ₃ -based composition (Re: rare earth component) with some glass-forming components or glass powder added, barium oxide-titanium oxide-neodymium oxide-based dielectric magnetic composition powder with some glass powder added There is something I did.

As an example, MgO: 18 wt% -Al _{2
O 3: 37wt% -SiO 2:} 37wt% -B 2 O 3:
5 wt% -TiO _2: and 73 wt% of glass powder 3 wt% a composition, and 17 wt% of a commercially available TiO ₂ powder, N
10 wt% of the d ₂ Ti ₂ O ₇ powder was thoroughly mixed to obtain a mixed powder. In addition, Nd ₂ Ti ₂ O ₇ powder is Nd ₂ O
₃ powder and TiO ₂ powder were calcined at 1200 ° C. and then pulverized to be used. Next, an acrylic organic binder, a plasticizer, toluene and an alcohol solvent were added to this mixed powder, and the mixture was sufficiently mixed with alumina boulders to obtain a slurry. Then, using this slurry, a green sheet having a thickness of 0.2 mm to 0.5 mm was prepared by a doctor blade method.

Next, in the case of the first embodiment, the conductor patterns shown in FIG. 1 are printed using silver paste as the conductor paste, and then the thickness of the green sheet on which these conductor patterns are printed is adjusted. Therefore, necessary green sheets were stacked and stacked so as to have the structure shown in FIG. 1, and after stacking, firing was performed at 900 ° C.

The upper surface of the laminated dielectric filter body configured as described above, the input terminal portion 611, the side surface excluding the output terminal portion 621, the input terminal portion 612, and the output terminal portion 622.
As shown in FIGS. 2 and 3, a ground electrode 70 made of a silver electrode is printed on the lower surface except for, and is further insulated from the ground electrode 70, and a silver electrode facing the resonant element 21 and the resonant element 24 is provided as an input terminal portion. 611, printed as the input terminal 511 and the output terminal 521 in the output terminal portion 621, and further insulated from the ground electrode 70, and the input terminal 511,
A silver electrode to be separately connected to the output terminal 521 is connected to the input terminal portion 6
12, the input terminal 512, the output terminal 5 in the output terminal section 622
Printed as No. 22, and the printed electrodes were baked at 850 ° C.

In the above laminated dielectric filter, the width w ₁ of each of the resonant elements 21 to 24 is 1.5 mm, and the resonant element 2 is
The length l ₁ of ₁ to 24 is 4 mm, and the width w _{2 of the} electrodes 31 to 34
Is 1.5 mm, and the length l ₂ of the electrodes 31 to 34 is 0.5 m
m, the spacing s ₁ between the resonance elements 21 to 24 and the electrodes 31 to 34 respectively facing them is 0.3 mm, the facing area between the input terminal 511 and the resonance element 21 is 3.2 mm ² , and the resonance with the output terminal 521 is performed. Area facing the element 24 is 3.2 mm
² , the thickness of the dielectric layers 11, 12, 13, 14, 15 are 0.8 mm, 1.6 mm, 1.6 mm, 1.6 m, respectively.
m, 0.8 mm, and dielectric layers 11, 12, 13, 1
Length l ₃ of 4, 15 is 4.8 mm, width w ₃ is 3.5 mm
, The outer shape is 6.4 mm × 4.8 mm × 3.
It was 5 mm, the center frequency was 1890 MHz, the bandwidth was 25 MHz, and the insertion loss was 3.5 dB or less.

Next, a second embodiment of the laminated dielectric filter of the present invention will be described. FIG. 6 is a schematic development view of this embodiment,
7 is a perspective view of this embodiment, FIG. 8 is a bottom view of this embodiment, FIG. 9 is a right side view showing the configuration of the main part of this embodiment, FIG.
11 is a sectional view taken along the line YY and a sectional view taken along the line XX of FIG. 9, respectively.

As shown in FIG. 6, an input electrode 513 is formed on the right side surface of the dielectric layer 16 so as to overlap a part of the resonance element 21 on the output end side, which will be described later, with the dielectric layer 11 interposed therebetween. The ground electrode 70 and the input terminal 511 are later formed on the left side surface of the dielectric layer 16, and the ground electrode 70 and the input terminal 512 are later formed on the lower surface of the dielectric layer 16.

A resonance element 21 having one end connected to a ground electrode 70, which will be described later, and forming a quarter-wave type stripline resonator is formed on the right side surface of the dielectric layer 11, and one end thereof is grounded later. An electrode 31 is formed on the right side surface of the dielectric layer 11 so as to be connected to the electrode 70 and have the other end isolated from the open end of the resonant element 21 for a predetermined period of time and facing the resonant element 21. The resonance element 21 is the resonance element on the input end side.

The dielectric layer 1 is formed so that the internal ground electrode 81 connected to the ground electrode 70 described later overlaps the open end side of the resonant element 21 and the open end side of the resonant element 22 described later.
7 is formed on the right side surface.

One end of the resonator element 22 is connected to a ground electrode 70, which will be described later, to form a quarter-wave stripline resonator on the right side surface of the dielectric layer 12, and one end thereof will be ground, which will be described later. An electrode 32 is formed on the right side surface of the dielectric layer 12 so as to be connected to the electrode 70 and have the other end thereof separated from the open end of the resonant element 22 for a predetermined period and facing the resonant element 22.

An internal ground electrode 82 connected to a ground electrode 70, which will be described later, is formed so as to overlap the open end side of the resonant element 22 and the open end side of the resonant element 23, which will be described later.
8 is formed on the right side surface.

A resonance element 23, one end of which is connected to a ground electrode 70 which will be described later and which constitutes a quarter-wavelength stripline resonator, is formed on the right side surface of the dielectric layer 13, and one end thereof is grounded later. An electrode 33 connected to the electrode 70 and having the other end isolated from the open end of the resonant element 23 for a predetermined period and facing the resonant element 23 is formed on the right side surface of the dielectric layer 13.

An internal ground electrode 83 connected to a ground electrode 70 described later is formed on the right side surface of the dielectric layer 19 so as to overlap the open end side of the resonant element 23 and the open end side of the resonant element 24 described later. To do.

A resonance element 24, one end of which is connected to a ground electrode 70 to be described later and which constitutes a quarter-wave stripline resonator, is formed on the right side surface of the dielectric layer 14, and one end of which is ground to be described later. An electrode 34, which is connected to the electrode 70 and has the other end isolated from the open end of the resonant element 24 for a predetermined period of time and facing the resonant element 24, is formed on the right side surface of the dielectric layer 14. The resonance element 24 is the resonance element on the output end side.

The dielectric layer 11 is provided with an output electrode 523 which overlaps a part of the resonant element 24 on the output end side with the dielectric layer 110 interposed therebetween.
It is formed on the right side surface of 0.

On the right side surface of the dielectric layer 110, the dielectric layer 15 on which the ground electrode 70 and the output terminal 521 are formed on the right side surface and the ground electrode 70 and the output terminal 522 are formed on the lower surface is laminated to form a dielectric layer. Layers 16, 11, 17, 12,
The laminated body 500 is formed by integrally forming 18, 13, 19, 14, 110, and 15.

As shown in FIGS. 7 and 8, the upper surface of the laminated body 500, the side surface excluding the input terminal portion 611 and the output terminal portion 621,
The ground electrode 70 is formed on the lower surface excluding the input terminal portion 612 and the output terminal portion 622. Further, in the input terminal portion 611 on the side surface of the laminated body 500, the input terminal 511 that is insulated from the ground electrode 70 and connected to the input electrode 513.
To form. The input terminal 5 that is insulated from the ground electrode 70 and is connected to the input terminal 511 and the input electrode 513 in the input terminal portion 612 on the lower surface of the laminated body 500.
12 is formed. Similarly, in the output terminal portion 621 on the side surface of the laminated body 500, the ground electrode 70 and the input terminal 5 are provided.
An output terminal 521 is formed which is insulated from the electrodes 11, 512 and is connected to the output electrode 523. And the laminated body 50
In the output terminal portion 622 on the lower surface of 0, the output terminal 5 insulated from the ground electrode 70 and the input terminals 511 and 512 and connected to the output terminal 521 and the output electrode 523.
22 is formed.

In this embodiment also, the input electrode 5
Since the input terminal 512 and the output terminal 522, which are respectively connected to the output electrode 523 and the output electrode 523, are provided on the lower surface of the laminated body 500, the structure is suitable for surface mounting when mounting the filter with the lower surface facing down. ing.

Further, in this embodiment, the input electrode 51 is used.
3 and the output electrode 523 are provided inside the laminated body 500 for the following reason. That is, if the dielectric layer between the resonant elements 21 and 24 at both ends and the ground electrode 70 is thin, the Q of the filter is lowered and the insertion loss of the filter is increased. Electrode 7
The distance from 0 must be increased to some extent. And
In such a state, if the structure is such that the input terminal 511 and the output terminal 521 are provided only on the surface of the laminated body, the input terminal 51
1. The distance between the output terminal 521 and the resonant elements 21 and 24 at both ends becomes large, and the capacitance 11 formed between them becomes large.
The capacitance value of 1 and 112 becomes small and the ripple becomes large. Therefore, the input electrode 513 and the output electrode 5
23 is provided inside the laminated body 500, and the distance between these electrodes and the resonant elements 21 and 24 at both ends is reduced to increase the capacitance value of the electrostatic capacitances 111 and 112 formed therebetween. Therefore, the ripple can be reduced.

In this embodiment, the input electrode 51 is also used.
3. Although the output electrode 523 is provided inside the laminated body 500, the input terminal 511 and the output terminal connected to the input electrode 513 and the output electrode 523, respectively, on the surface of the laminated body 500. The reason why 521 is provided is as follows. That is, these input terminals 51
1. By providing the output terminal 521 on the side surface of the laminated body, the solder creeps up along the input terminal 511 and the output terminal 521 during mounting, and the mounting of the filter becomes more reliable.

In this embodiment, there is an overlapping portion between the resonance element 21 and the input electrode 513 with the dielectric layer 11 interposed therebetween, and the overlapping portion including the dielectric layer 11 is electrostatically coupled. Has become. This capacitance is designated as capacitance 111. There is an overlapping portion between the resonance element 24 and the output electrode 523 with the dielectric layer 110 sandwiched therebetween, and the overlapping portion including the dielectric layer 110 is electrostatically coupled. This capacitance is designated as capacitance 112.

Further, the resonance elements 21, 22, 23, 24
Capacitances 121, 122, 123, and 124 are formed between the open ends of the electrodes and the electrodes 31, 32, 33, and 34, respectively.

Further, the resonance element 21 and the internal earth electrode 8
A capacitance 142 is formed between the resonance element 22 and
And the internal ground electrodes 81, 82 have a capacitance of 14
3, 144 are respectively formed, and electrostatic capacitances 145, 146 are provided between the resonance element 23 and the internal ground electrodes 82, 83.
Respectively, the resonance element 24 and the internal earth electrode 8 are formed.
An electrostatic capacitance 147 is formed between the first and second electrodes.

Then, these electrostatic capacitances 121 to 12
Due to the presence of 4, 142 to 147, the resonance element 21 and the resonance element 22 are caused by the inductance 131.
The resonance element 22 and the resonance element 23 are coupled by the inductance 132, and the resonance element 23 and the resonance element 24 are coupled by the inductance 133, respectively, to form a comb line type filter.

FIG. 12 shows an equivalent circuit of the laminated dielectric filter constructed as described above.

Next, the function and effect of the internal ground electrodes 81 to 83 used in this embodiment will be described.

First, consider the case where two comb-line type resonant elements 321 and 322 are present as shown in FIG. The electrical lengths of the resonant elements 321 and 322 are both θ. FIG. 14 is an equivalent circuit diagram of the comb line type wiring of FIG. Here, if the even-mode impedance of the resonant elements 321 and 322 is Z _e and the odd-mode impedance is Z ₀ , the characteristic impedance Z _C of the distributed constant element 323 that couples the resonant elements 321 and 322 in a distributed constant manner.
Is

[0061]

[Equation 1]

It becomes Furthermore, this characteristic impedance Z
_The impedance Z seen from the open side of the _C line is Z =
It is expressed as jZ _C tan θ.

FIG. 15 shows the relationship between the reactance Z _C tan θ of the impedance Z and the electrical length θ. θ = 90 ° (i.e., 1/4-wavelength), the reactance Z _C tan theta is next ∞ distributed constant element 323, between the resonance elements 321 and 322, it can be seen that coupling is not present. Next, if the electrical length θ becomes shorter than ¼ wavelength, that is, if 0 <θ <90 °, tan
θ becomes a finite value, the reactance Z _C tan θ of the distributed constant element 323 also becomes a finite value, and the resonant elements 321 and 32 are
2 becomes coupled, and the reactance Z _C tan θ becomes smaller as the value of θ becomes smaller, resulting in stronger coupling. Then, in this case, that is, when 0 <θ <90 °, the value of Z _C tan θ is positive, and therefore the distributed constant element 323 is represented as an inductance.

Referring again to FIGS. 6 and 9-10, the internal ground electrodes 81-83 are partially connected to the resonance element 2.
By adding to the open end side of 1 to 24, the resonance element 2
Internal ground electrodes 81 to 8 on the open end side of 1 to 24
The portion overlapping with 3 becomes closer to the ground and the coupling with the ground becomes stronger, so that the coupling between the resonance elements 21 to 24 in the portion overlapping with the internal ground electrodes 81 to 83 becomes weak.
Therefore, the resonance elements 21 to 24 are mainly coupled to each other at a portion which does not overlap with the internal ground electrodes 81 to 83. This means that the coupled electrical length θ of the resonant elements 21 to 24 is substantially equal to the length of the portion that does not overlap the internal ground electrodes 81 to 83. When the coupling electrical length θ of the resonant elements 21 to 24 is shortened in this way, the reactance Z _C tan θ of the distributed constant element 323 coupling the resonant elements 21 to 24 is also reduced.
.About.24 are more strongly coupled to each other, and the filter characteristics can be broadened.

Since the electrodes 31 to 34 are provided, the capacitances 121 to 121 are provided between the resonance elements 21 to 24 and the ground.
124 is added, the capacitance 142 is formed between the resonance element 21 and the internal ground electrode 81 by further providing the internal ground electrodes 81 to 83, and the resonance element 22 and the internal ground electrode 81. Capacitances 143 and 144 are formed between the resonance element 23 and the internal earth electrodes 82 and 83, and capacitances 145 and 146 are formed between the resonance element 23 and the internal ground electrodes 82 and 83, respectively. An electrostatic capacitance 147 is formed between the electrode 83 and these electrodes, and these electrostatic capacitances are also added between the resonant elements 21 to 24 and the ground. Therefore, FIG.
The capacitances of the parallel resonance circuits shown in are the capacitances 211, 221, 231 when the resonance elements 21 to 24 are equivalently replaced,
If the resonance frequency is the same as a combined electrostatic capacitance composed of the sum of 241 and the added electrostatic capacitance, the inductance of the parallel resonant circuit can be small. Therefore, the length of the resonant elements 21 to 24 becomes shorter, and the total length of the laminated dielectric filter becomes shorter.

Next, a method of manufacturing the laminated dielectric filter of this embodiment will be described. Also in this embodiment, the first
It is necessary to print the conductor patterns shown in FIG. 6 by using the silver sheets as the conductor paste, and then to adjust the thickness of the green sheets on which the conductor patterns are printed, using the green sheets used in the examples. After stacking the green sheets so as to have the structure shown in FIG. 6, the green sheets were baked at 900 ° C.

The upper surface of the main body of the laminated dielectric filter constructed as described above, the input terminal portion 611, and the output terminal portion 621.
Except the side surface, the input terminal portion 612, and the output terminal portion 62
As shown in FIGS. 7 and 8, a ground electrode 70 made of a silver electrode is printed on the lower surface except 2 and is further insulated from the ground electrode 70 and is separately connected to the input electrode 513 and the output electrode 523. The input terminal portion 612 and the output terminal portion 62
Printed as an input terminal 512 and an output terminal 522 in 2
Furthermore, a silver electrode, which is insulated from the ground electrode 70 and is separately connected to the input terminal 512 and the output terminal 522, is provided in the input terminal portion 611 and the output terminal portion 621.
1. Printed as the output terminal 521, and the printed electrode is 85
Baked at 0 ° C.

In the laminated dielectric filter having the above structure
The width w of the internal ground electrodes 81, 82 ₃Is 1.5 mm,
Length l of the internal ground electrodes 81-83_FourWithin 1.8 mm
Area between the ground electrode 81 and the resonant elements 21 and 22
1.5 mm², The internal ground electrode 82 and each resonant element 2
The facing area with 2, 23 is 1.5 mm², Internal ground electrode
The opposing area of 83 and each resonance element 23, 24 is 1.5 mm.
², Dielectric layers 16, 11, 17, 12, 18, 13, 1
The thickness of 9, 14, 110, 15 is 0.6 mm,
0.2mm, 0.8mm, 0.8mm, 0.8mm,
0.8mm, 0.8mm, 0.8mm, 0.2mm,
The input electrode 513 and the resonance element 21 are set to 0.6 mm.
Facing area 0.8 mm², Output electrode 523 and resonant element
The area facing 24 is 0.8 mm²And the other is the first implementation
When configured in the same manner as the example, the center frequency is set to that of the first embodiment.
To make the same 1890 MHz, the length of the resonant element l₁To
It may be 3.3 mm, and is 4 m in the first embodiment.
Compared with m, it is 0.7 mm shorter. That
The length of the laminated dielectric filter itself l₃Example 1
Was 4.8 mm, but it was 4.1 mm shorter.
It was In this case, the internal ground electrodes 81-83 are exposed.
Resonance element length l in the protruding part_FiveIs 2.3 mm
The external shape is 6.4 mm × 4.1 mm × 3.5 mm
there were. In addition, the bandwidth is 90 MHz,
It was wider than the example. Thus, in the second embodiment,
Has a significantly improved bandwidth, and the multilayer dielectric filter
It can be seen that the size of itself is smaller. Na
In this embodiment, the insertion loss is 2.9 dB or less.
It was.

Next, a third embodiment of the laminated dielectric filter of the present invention will be described. 16 is a schematic development view of this embodiment, FIG. 17 is a right side plan view showing the configuration of the main part of this embodiment, and FIGS. 18 and 19 are XX line and Y- line of FIG. 16, respectively.
It is a Y line sectional view.

In this embodiment, the resonance elements 21, 24 are
The second configuration is that only one filter is used and a two-stage filter configuration is used, and that the internal ground electrode 84 between the resonant elements 21 and 24 is provided so as to overlap the ground side of the resonant elements 21 and 24. Although different from the embodiment, the other configurations are the same as those of the second embodiment.

In this embodiment, there is an overlapping portion between the resonance element 21 and the input electrode 513 with the dielectric layer 11 interposed therebetween, and the overlapping portion including the dielectric layer 11 is electrostatically coupled. ing. This capacitance is 1
11 There is also an overlapping portion between the resonance element 24 and the output electrode 523 with the dielectric layer 110 interposed therebetween, and the dielectric layer 1
The overlapping portion including 10 is electrostatically coupled. This capacitance is designated as capacitance 112.

Further, capacitances 121 and 1 are provided between the open ends of the resonant elements 21 and 24 and the electrodes 31 and 34, respectively.
24 are formed. And in this embodiment,
Due to the presence of the internal ground electrode 84, the resonance element 21 and the resonance element 24 are coupled by the electrostatic capacitance 151 to form a combline type filter.

FIG. 20 shows an equivalent circuit of the laminated dielectric filter constructed as described above.

Next, the function and effect of the internal ground electrode 84 used in this embodiment will be described.

First, consider the case where two combline type resonance elements 321 and 322 are present as shown in FIG. The electrical lengths of the resonant elements 321 and 322 are both θ. FIG. 22 is an equivalent circuit diagram of the comb line type wiring of FIG. Here, if the even-mode impedance of the resonant elements 321 and 322 is Z _e and the odd-mode impedance is Z ₀ , the characteristic impedance Z _C of the distributed constant element 323 that couples the resonant elements 321 and 322 in a distributed constant manner.
Is

[0076]

[Equation 2]

It becomes Furthermore, this characteristic impedance Z
_The impedance Z seen from the open side of the _C line is Z =
-JZ _C cot θ.

FIG. 23 shows the relationship between the reactance-Z _C cot θ of the impedance Z and the electrical length θ. When θ = 90 ° (that is, ¼ wavelength), the reactance −Z _C cot θ of the distributed constant element 323 becomes 0, and it can be seen that there is no coupling between the resonant elements 321 and 322. Next, if the electrical length θ becomes shorter than ¼ wavelength, that is, if 0 <θ <90 °, cot
θ becomes a finite value, the reactance of the distributed constant element 323 −Z _C cot θ also becomes a finite value, and the resonant elements 321 and 3
22 becomes connected. Then, in this case, that is, in the case of 0 <θ <90 °, the value of −Z _C cot θ is negative, and therefore the distributed constant element 323 is represented as a capacitance.

16 to 20, the internal ground electrode 84 is partially connected to the resonance elements 21, 24.
Since it is added to the ground side of the resonance elements 21 and 24, the portion of the resonance elements 21 and 24 that overlaps with the internal ground electrode 84 becomes closer to the ground and the coupling with the ground is strengthened. Resonant element 2 in the overlapping part
The bond between 1 and 24 becomes weak. Therefore, the resonant element 21,
The connection between 24 is mainly made in a portion which does not overlap with the internal ground electrode 84. This means that the resonant element 2
This means that the combined electrical length θ of 1 and 24 is substantially equal to the length of the portion that does not overlap the internal ground electrode 84. As described above, when the coupling electric length θ of the resonant elements 21 and 24 is shortened, the resonant elements 21 and 24 are more strongly coupled to each other, and the band of the filter characteristic is widened.

Next, a method of manufacturing the laminated dielectric filter of this embodiment will be described. Also in this embodiment, the first
It is necessary to print the conductor patterns shown in FIG. 16 using the green sheets used in the examples of the above, using silver paste as the conductor paste, and then adjust the thickness of the green sheets on which these conductor patterns are printed. After stacking the green sheets so as to have the structure shown in FIG. 16, the green sheets were baked at 900 ° C.

The upper surface of the laminated dielectric filter body constructed as described above, the input terminal portion 611, the side surface excluding the output terminal portion 621, the input terminal portion 612, and the output terminal portion 622.
As shown in FIGS. 7 and 8, a ground electrode 70 made of a silver electrode is printed on the lower surface except for the silver electrode, which is further insulated from the ground electrode 70 and connected to the input electrode 513 and the output electrode 523 separately. The input terminal portion 612 and the output terminal portion 62
In FIG. 2, a silver electrode that is printed as an input terminal 512 and an output terminal 522 and that is insulated from the ground electrode 70 and that is separately connected to the input terminal 512 and the output terminal 522 is provided with an input terminal portion 611 and an output terminal portion 621. Input terminal 51
1. Printed as the output terminal 521, and the printed electrode is 85
Baked at 0 ° C.

In the laminated dielectric filter having the above structure, the thickness of the dielectric layer 116 is 0.8 mm, the length l ₆ of the internal ground electrode 84 is 15 mm ² , and the other structures are the same as those of the second embodiment. If you do, the outer shape is 4.1mm × 3.2
mm × 3.5 mm, center frequency is 2380 MH
z, the bandwidth was 120 MHz, and the insertion loss was 2.2 dB or less.

Next, a fourth embodiment of the laminated dielectric filter of the present invention will be described. In the second and third embodiments, the input electrode 5 provided inside the laminated body 500.
13 and the output electrode 523 are connected to the input terminal 511 and the output terminal 521, respectively, provided on the side surface of the laminated body 500 through the input terminal 512 and the output terminal 522 provided on the lower surface of the laminated body 500, respectively. In this embodiment, the input electrode and the output electrode provided inside the laminated body 500 are provided on the side surface of the laminated body 500 through the via holes provided in the dielectric layer. Are connected to each.

FIG. 24 is a schematic development view of this embodiment, FIG. 25 is a perspective view of this embodiment, FIG. 26 is a right side view showing the structure of the main part of this embodiment, and FIG. It is an X-ray sectional view.

As shown in FIG. 24, an input electrode 515 is formed on the right side surface of the dielectric layer 16 so as to overlap a part of the resonance element 21 on the input end side described later with the dielectric layer 11 interposed therebetween. The ground electrode 70 and the input terminal 511 are formed later on the left side surface of the dielectric layer 16, and the ground electrode 70 is formed later on the lower surface of the dielectric layer 16. Also, the dielectric layer 1
A via hole 516 connecting the input electrode 515 and the input terminal 511 is formed in the substrate 6.

A resonance terminal 21 which is connected to a ground electrode 70 described later and constitutes a quarter-wave type stripline resonator is formed on the right side surface of the dielectric layer 11, and one end thereof is grounded as described later. An electrode 31 is formed on the right side surface of the dielectric layer 11 so as to be connected to the electrode 70 and have the other end thereof separated from the open end of the resonant element 21 for a predetermined period and facing the resonant element 21. The resonance element 21 is the resonance element on the input end side.

A resonance element 24, one end of which is connected to a ground electrode 70 described later and which constitutes a quarter-wave strip line resonator, is formed on the right side surface of the dielectric layer 14, and one end thereof is grounded as described later. An electrode 34, which is connected to the electrode 70 and has the other end isolated from the open end of the resonant element 24 for a predetermined period and facing the resonant element 24, is formed on the right side surface of the dielectric layer 14. The resonance element 24 is the resonance element on the output end side.

An output electrode 525, which overlaps with a part of the resonant element 24 on the output end side with the dielectric layer 110 interposed therebetween, is provided on the dielectric layer 11.
It is formed on the right side surface of 0.

On the right side surface of the dielectric layer 110, the dielectric layer 15 having the ground electrode 70 and the output terminal 521 formed on the right side surface and the ground electrode 70 formed on the lower surface is laminated, and the dielectric layers 16 and 11 are laminated. , 14, 110, and 15 are integrally formed to form a laminated body 500. A via hole 526 connecting the output electrode 525 and the output terminal 521 is formed in the dielectric layer 15.

As shown in FIG. 25, the upper surface of the laminated body 500, the side surfaces except the input terminal portion 611 and the output terminal portion 621, and the input terminal portion 612 and the output terminal portion 622.
The ground electrode 70 is formed on the lower surface except for. Further, the ground electrode 70 is provided in the input terminal portion 611 on the side surface of the laminated body 500.
Insulated from the input electrode 515 and via hole 516
Forming an input terminal 511 connected through. In addition,
No input terminal is formed in the input terminal portion 612 on the lower surface of the laminated body 500. Similarly, in the output terminal portion 621 on the side surface of the laminated body 500, the ground electrode 70 and the input terminal 51 are provided.
1 and is insulated from the output electrode 525 and the via hole 52.
The output terminal 521 connected via 6 is formed. No output terminal is formed in the output terminal portion 622 on the lower surface of the laminated body 500.

Also in this embodiment, since the input electrode 515 and the output electrode 525 are provided inside the laminated body 500, the input electrode 515 and the output electrode 515 are output as in the second and third embodiments. Electrode 525 and resonance element 2 at both ends
It is possible to reduce the distance from the electrodes 1 and 24, increase the capacitance value of the electrostatic capacitances 111 and 112 formed between them, and consequently reduce the ripple.

Also in this embodiment, the input electrode 5 is used.
Although the output electrode 525 and the output electrode 525 are provided inside the laminated body 500, they are connected to the surface of the laminated body 500 with the input electrode 515 and the output electrode 525 through via holes 516 and 526, respectively. Input terminal 5
11. The output terminal 521 is provided because the input terminal 511 and the output terminal 521 are provided on the side surface of the laminated body, so that the solder creeps up along the input terminal 511 and the output terminal 521 during mounting, This is because the implementation of the filter becomes more reliable.

In this embodiment, the input electrode 5
The input electrode 515 and the output electrode 525 are connected to the input terminal 511 and the output terminal 521 via the via holes 516 and 526, respectively, as in the second and third embodiments. An input terminal 512 and an output terminal 522 for connecting the input terminal 511 and the output terminal 521, respectively, to the laminated body 50.
It is not necessary to provide it on the lower surface of 0. As a result, it is possible to solve the problem that when the filter is mounted on the mounting substrate, these terminals come into contact with the mounting substrate and thus affect the characteristics of the filter. That is, as in this embodiment, the input electrode 515, the output electrode 525, and the input terminal 51 are connected.
1 and the output terminal 521 to the via hole 51, respectively.
The laminated body 500 by connecting through 6, 526
Since it is not necessary to provide input / output terminals on the lower surface of, the input / output terminals formed on the lower surface of the laminated body 500 can be eliminated or made small. Therefore, there is no contact between the mounting board and the input / output terminals, or if there is any contact, the size can be made small, so that stable filter characteristics can be obtained without being affected by the material of the mounting board.

Also in this embodiment, the resonance element 21
And the input electrode 515, there is an overlapping portion with the dielectric layer 11 interposed therebetween, and the overlapping portion including the dielectric layer 11 is electrostatically coupled. This capacitance is designated as capacitance 111. Resonant element 24 and output electrode 52
5 also has an overlapping portion with the dielectric layer 110 interposed therebetween, and the overlapping portion including the dielectric layer 110 is electrostatically coupled. This capacitance is set as capacitance 11
2 (see FIGS. 24 to 27).

Further, capacitances 121, 1 are provided between the open ends of the resonant elements 21, 24 and the electrodes 31, 34, respectively.
24 are formed (see FIGS. 24 to 27).

Then, these electrostatic capacitances 121 and 124
The presence of the resonance element 21 and the resonance element 24
Are coupled by an inductance 135 to form a combline type filter.

FIG. 28 shows an equivalent circuit of the laminated dielectric filter constructed as described above.

Next, a method of manufacturing the laminated dielectric filter of this embodiment will be described. Also in this embodiment, the first
Using the green sheets used in the examples, the silver paste is used as a conductor paste to print the conductor patterns shown in FIG. 24, respectively, and then it is necessary to adjust the thickness of the green sheets on which the conductor patterns are printed. After stacking the green sheets so as to have the structure shown in FIG. 24, the green sheets were fired at 900 ° C.

The upper surface of the main body of the laminated dielectric filter constructed as described above, the input terminal portion 611, and the output terminal portion 621.
Except the side surface, the input terminal portion 612, and the output terminal portion 62
As shown in FIG. 25, a ground electrode 70 made of a silver electrode is printed on the lower surface except 2 and is further insulated from the ground electrode 70, and via the input electrode 515 and the output electrode 525 via holes 516 and 526, respectively. The silver electrodes to be connected by printing are printed in the input terminal portion 611 and the output terminal portion 621 as the input terminal 511 and the output terminal 521, respectively, and the printed electrodes are baked at 850 ° C. to obtain the laminated dielectric filter of this embodiment. Manufactured.

Next, a fifth embodiment of the laminated dielectric filter of the present invention will be described. FIG. 29 is a sectional view of this embodiment. In this embodiment, the resonance elements 21, 22,
The resonance element 21 on the input end side is connected to the input terminal 511 through the via hole 516, and the resonance element 24 on the output end side is connected to the output terminal 521 through the via hole 526. ing.

Next, a sixth embodiment of the laminated dielectric filter of the present invention will be described. In the first to fifth embodiments, the combline type filter has been described as an embodiment of the present invention, but this embodiment relates to an interdigital type dielectric filter.

FIG. 30 is a schematic development view of this embodiment, FIGS. 31 and 32 are bottom views of this embodiment, and FIG. 33 is Z of FIG.
It is a -Z line sectional view.

A resonance element 21 having one end connected to a ground electrode 70, which will be described later, and constituting a quarter-wave type stripline resonator is formed on the right side surface of the dielectric layer 11. Further, an electrode 31 is formed on the right side surface of the dielectric layer 11 so that one end thereof is connected to a ground electrode 70, which will be described later, and the other end thereof is separated from the open end of the resonant element 21 by a predetermined distance and faces the resonant element 21. To do. The resonance element 21 has a tap type input electrode 51.
4 is connected. The ground electrode 70 and the input terminal 511 are formed later on the left side surface of the dielectric layer 11, and the ground electrode 70 and the input terminal 512 are formed later on the lower surface of the dielectric layer 11. Also in this embodiment,
The input terminal 512 is connected to both the tap type input electrode 514 and the input terminal 511.

A resonance element 22 whose one end is connected to a ground electrode 70 which will be described later and which constitutes a quarter-wave type stripline resonator is provided on the right side surface of the dielectric layer 12 with the resonance element 21.
Are provided with the open end side and the ground side opposite to each other.
Further, an electrode 32 is formed on the right side surface of the dielectric layer 12, one end of which is connected to a ground electrode 70, which will be described later, and the other end of which is separated from the open end of the resonant element 22 by a predetermined distance and which faces the resonant element 22. ..

A resonance element 24, one end of which is connected to a ground electrode 70, which will be described later, and which constitutes a quarter-wave type stripline resonator, is provided on the right side surface of the dielectric layer 14.
2 is provided with the directions of the open end side and the ground side opposite to each other. Further, the electrode 34, one end of which is connected to a ground electrode 70 described later, and the other end of which is separated from the open end of the resonant element 24 for a predetermined period and which faces the resonant element 24, is formed on the dielectric layer 14.
On the right side of the. A tap type output electrode 524 is connected to the resonance element 24.

On the right side surface of the dielectric layer 14, the dielectric layer 15 on which the ground electrode 70 and the output terminal 521 are formed on the right side surface and the ground electrode 70 and the output terminal 522 are formed on the lower surface is laminated. The layers 11, 12, 14, 15 are integrally configured to form a laminate 500.

As shown in FIGS. 31 and 32, the laminated body 500
The ground electrode 70 is formed on the upper surface, the side surface excluding the input terminal portion 611 and the output terminal portion 621, and the lower surface excluding the input terminal portion 612 and the output terminal portion 622. Furthermore, the laminated body 50
An input terminal 511, which is insulated from the ground electrode 70 and is connected to the tap type input electrode 514, is formed on the input terminal portion 611 on the side surface of 0. The input terminal 512, which is insulated from the ground electrode 70 and is connected to the input terminal 511 and the tap type input electrode 514, is also formed in the input terminal portion 612 on the lower surface of the laminated body 500. Similarly, the laminated body 5
The output terminal 521, which is insulated from the ground electrode 70 and the input terminals 511 and 512 and is connected to the tap-type output electrode 524, is formed in the output terminal portion 621 on the side surface of 00. Then, the output terminal 522, which is insulated from the ground electrode 70 and the input terminals 511 and 512 and is connected to the output terminal 521 and the tap-type output electrode 524, is also formed in the output terminal portion 622 on the lower surface of the stacked body 500.

In this embodiment, the resonance elements 21, 2 are
Since the open ends and the ground side of the elements 2 and 24 are staggered, the resonant elements 21, 22 and 24 are coupled by the inductances 131 and 134, respectively.
A stage interdigital filter is constructed.

FIG. 34 shows an equivalent circuit of the laminated dielectric filter constructed as described above.

Next, a method of manufacturing the laminated dielectric filter of this embodiment will be described. Also in this embodiment, the first
Using the green sheets used in the examples, the conductor patterns shown in FIG. 30 are printed by using the silver paste as the conductor paste, and then it is necessary to adjust the thickness of the green sheets on which these conductor patterns are printed. After stacking the green sheets so as to have the structure shown in FIG. 30, the green sheets were baked at 900 ° C.

31 and 32, the upper surface of the laminated dielectric filter configured as described above, the side surface excluding the input terminal portion 611 and the output terminal portion 621, and the lower surface excluding the input terminal portion 612 and the output terminal portion 622 are shown in FIGS. As shown, the ground electrode 70 made of a silver electrode is printed, and further insulated from the ground electrode 70, and the tap type input electrode 514 and the tap type output electrode 5 are provided.
The silver electrodes to be separately connected to 24 are printed as the input terminal 512 and the output terminal 522 in the input terminal portion 612 and the output terminal portion 622, and are also insulated from the ground electrode 70, and the input terminal 512 and the output terminal are also provided. Silver electrodes to be separately connected to 522 were printed in the input terminal portion 611 and the output terminal portion 621 as the input terminal 511 and the output terminal 521, and the printed electrodes were baked at 850 ° C.

In the laminated dielectric filter having the above structure, the width w ₁ of each of the resonant elements 21, 22, 24 is 1.5 m.
m, the length l ₁ of the resonant elements 21, 22, 24 4 mm,
The width w _{2 of the} electrodes 31, 32, 34 is 1.5 mm and the length l ₂
Is 0.5 mm, the distance s ₃ between the resonant elements 21, 22, and 24 and the electrodes 31, 32, and 34 respectively facing them is 0.3 mm, and the distance l ₆ from the ground side end of the tap type input electrode 514 is 1.0 mm, the distance l ₇ from the ground side end of the tap type output electrode 524 is 1.0 mm, the dielectric layer 11,
The thicknesses of 12, 14, and 15 are 0.8 mm and 1.6, respectively.
mm, 1.6 mm, and 0.8 mm, the outer shape was 4.8 mm × 4.8 mm × 3.5 mm, the center frequency was 1980 MHz, the bandwidth was 90 MHz, and the insertion loss was 2.5 dB or less. ..

[0113]

According to the present invention, when the laminated dielectric filter has the input terminals and the output terminals of the laminated dielectric filter mounted on the mounting substrate, the main surfaces of the plurality of resonant elements are mounted on the mounting substrate. Since it is configured to be substantially vertical with respect to it, the occupied area when mounted can be reduced.

Further, in the present invention, the input terminal and the output terminal portion of the laminated dielectric filter are provided on the surface of the laminated dielectric filter in a direction substantially perpendicular to the laminating direction of the plurality of resonant elements. 1 part and a second part provided on the surface of the multilayer dielectric filter in a direction substantially parallel to the stacking direction of the plurality of resonant elements and connected to the first part. Therefore, by mounting the laminated dielectric filter on the mounting substrate using the second portions of the input terminal and the output terminal, the main surface of the resonant element becomes substantially vertical to the mounting substrate. as a result,
The occupied area when mounted can be reduced.

Further, in the present invention, since the input terminal and the output terminal are provided on the surface of the multilayer filter in the direction substantially perpendicular to the stacking direction of the plurality of resonant elements, the input terminal and the output terminal are mounted. By mounting the multilayer dielectric filter on the mounting board so that it is almost perpendicular to the surface of the board, the main surface of the resonant element can be made almost perpendicular to the mounting board, and the occupation when mounted Not only can the area be reduced, but further, the input electrode connected to the input terminal is electrostatically coupled to the input end side resonance element of the plurality of resonance elements in a direction substantially perpendicular to the stacking direction of the plurality of resonance elements. And the output electrode connected to the output terminal is electrostatically coupled to the output end side resonance element of the plurality of resonance elements in a direction substantially perpendicular to the stacking direction of the plurality of resonance elements. The distance between the input end side resonance element and the input electrode and the distance between the output end side resonance element and the output electrode can be reduced, and the capacitance value of the capacitance formed between them can be increased. It is possible to reduce the ripple and to keep the thickness of the dielectric layer between the input end side resonance element and the output end side resonance element and the ground electrode provided on the surface of the multilayer filter large. It is also possible to prevent the Q of the filter from decreasing.

Furthermore, in the present invention, since the input terminal and the output terminal are provided on the surface of the multilayer filter in the direction substantially perpendicular to the stacking direction of the plurality of resonant elements, the input terminal and the output terminal are mounted. By mounting the multilayer dielectric filter on the mounting board so that it is substantially perpendicular to the surface of the board, the main surface of the resonant element can be made substantially perpendicular to the mounting board. Not only can the area be reduced, but further, in the present invention,
An input electrode in which an input terminal provided on the surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements is electrostatically coupled to the input end side resonant element of the plurality of resonant elements. And a surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, which is connected via a via hole or directly connected to the input end side resonant element of the plurality of resonant elements through a via hole. An output terminal provided on the output end side resonant element of the plurality of resonant elements and an output electrode electrostatically coupled to the output electrode via a via hole, or the output end side resonant element of the plurality of resonant elements and a via hole. Since it is directly connected via the input terminal, the terminal for connecting the input electrode and the input terminal and the terminal for connecting the output electrode and the output terminal or the input end side resonant element and the input terminal are connected. Since it is not necessary to provide terminals for connecting the output end side resonant element and the output terminal on the lower surface of the laminated dielectric filter, the terminals formed on these lower surfaces can be eliminated or made smaller, so that the laminated type It is possible to solve the problem that when the dielectric filter is mounted on the mounting substrate, these terminals come into contact with the mounting substrate to affect the characteristics of the filter.

[Brief description of drawings]

FIG. 1 is a schematic development view of a laminated dielectric filter according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the laminated dielectric filter according to the first embodiment of the present invention.

FIG. 3 is a bottom view of the multilayer dielectric filter according to the first embodiment of the present invention.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is an equivalent circuit diagram of the laminated dielectric filter according to the first embodiment of the present invention.

FIG. 6 is a schematic development view of a laminated dielectric filter according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a laminated dielectric filter according to a second embodiment of the present invention.

FIG. 8 is a bottom view of the laminated dielectric filter according to the second embodiment of the present invention.

FIG. 9 is a plan view showing a configuration of a main part of a laminated dielectric filter according to a second embodiment of the present invention.

10 is a cross-sectional view taken along line YY of FIG.

11 is a sectional view taken along line XX of FIG.

FIG. 12 is an equivalent circuit diagram of a laminated dielectric filter according to a second embodiment of the present invention.

FIG. 13 is a diagram for explaining a combline type resonance element.

FIG. 14 is an equivalent circuit diagram of the wiring of FIG.

FIG. 15 is a distributed constant element 3 in the equivalent circuit diagram of FIG.
It is a figure which shows the reactance of the impedance of 23, and the relationship between electric length.

FIG. 16 is a schematic development view of a laminated dielectric filter according to a third embodiment of the present invention.

FIG. 17 is a plan view showing a configuration of a main part of a laminated dielectric filter according to a third embodiment of the present invention.

18 is a sectional view taken along line XX of FIG.

19 is a cross-sectional view taken along the line YY of FIG.

FIG. 20 is an equivalent circuit diagram of a laminated dielectric filter according to a third embodiment of the present invention.

FIG. 21 is a diagram for explaining a combline type resonance element.

22 is an equivalent circuit diagram of the wiring of FIG.

FIG. 23 is a distributed constant element 3 in the equivalent circuit diagram of FIG. 22.
It is a figure which shows the reactance of the impedance of 23, and the relationship between electric length.

FIG. 24 is a schematic development view of the laminated dielectric filter of the fourth embodiment of the present invention.

FIG. 25 is a perspective view of a multilayer dielectric filter according to a fourth embodiment of the present invention.

FIG. 26 is a plan view showing a configuration of a main part of a laminated dielectric filter according to a fourth embodiment of the present invention.

27 is a sectional view taken along line XX of FIG. 26.

FIG. 28 is an equivalent circuit diagram of a multilayer dielectric filter according to a fourth embodiment of the present invention.

FIG. 29 is a sectional view of a laminated dielectric filter according to a fifth embodiment of the present invention.

FIG. 30 is a schematic development view of a laminated dielectric filter according to a sixth embodiment of the present invention.

FIG. 31 is a perspective view of a laminated dielectric filter according to a sixth embodiment of the present invention.

FIG. 32 is a bottom view of the multilayer dielectric filter according to the sixth embodiment of the present invention.

FIG. 33 is a sectional view taken along line ZZ of FIG. 30.

FIG. 34 is an equivalent circuit diagram of a laminated dielectric filter according to a sixth embodiment of the present invention.

FIG. 35 is an equivalent circuit diagram of a conventional multilayer dielectric filter devised by the present inventors.

FIG. 36 is a perspective view of a conventional laminated dielectric filter devised by the present inventors.

FIG. 37 is an equivalent circuit diagram of a conventional laminated dielectric filter devised by the present inventors.

[Explanation of symbols]

 21, 22, 23, 24 ... Resonant elements 11-19, 110 ... Dielectric layer 511, 512 ... Input terminal 521, 522 ... Output terminal 513, 515 ... Input electrode 523, 525 ... Output electrode

Claims (4)

[Claims] 1. In a laminated dielectric filter in which a plurality of resonant elements are laminated, when the laminated dielectric filter is mounted on a mounting substrate, the main surface of the resonant element is substantially in relation to the mounting substrate. An input terminal and an output terminal of the multilayer dielectric filter are configured so as to be vertical, and a multilayer dielectric filter. 2. A multilayer dielectric filter in which a plurality of resonant elements are stacked, wherein an input terminal and an output terminal of the multilayer dielectric filter are in a direction substantially perpendicular to a stacking direction of the plurality of resonant elements. A first portion provided on the surface of the multilayer dielectric filter, and a first portion provided on the surface of the multilayer dielectric filter in a direction substantially parallel to the stacking direction of the plurality of resonant elements and connected to the first portion. And a second portion, and a laminated dielectric filter. 3. A multilayer dielectric filter in which a plurality of resonant elements are stacked, wherein the multilayer dielectric filter is provided in a direction substantially perpendicular to a stacking direction of the plurality of resonant elements, and the plurality of resonant elements. An input electrode electrostatically coupled to the input end side resonant element, and an input provided on the surface of the multilayer filter in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements and connected to the input electrode. A terminal, an output electrode provided in a direction substantially perpendicular to the stacking direction of the plurality of resonant elements, and electrostatically coupled to the output end side resonant element of the plurality of resonant elements; and a stacking direction of the plurality of resonant elements An output terminal provided on the surface of the multilayer filter in a direction substantially perpendicular to the output terminal and connected to the output electrode, the multilayer dielectric filter. 4. A laminated dielectric filter in which a plurality of resonant elements are laminated, wherein an input terminal provided on the surface of the laminated dielectric filter in a direction substantially perpendicular to the laminating direction of the plurality of resonant elements comprises: The input end side resonant element of the plurality of resonant elements is electrostatically coupled to the input electrode via a via hole or is directly connected to the input end side resonant element of the plurality of resonant elements via a via hole; The output terminal provided on the surface of the multilayer dielectric filter in a direction substantially perpendicular to the stacking direction of the resonant elements, the output electrode electrostatically coupled to the output end side resonant elements of the plurality of resonant elements, and the via hole. A multilayer dielectric filter, wherein the multilayer dielectric filter is connected via a via hole or is directly connected to an output end side resonant element of the plurality of resonant elements via a via hole.