JPH11177303A - Laminated high frequency filter and its frequency characteristic adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a frequency characteristic without changing the pattern of a strip line conductor layer by connecting exposed additional conductor layers provided on the fourth side of a dielectric body to the strip line conductor layer. SOLUTION: First and second strip conductor layers 2 and 3 have 1/4 wavelengths and they are arranged in parallel when viewed from a first main face 12-side on the main face of the fourth dielectric layer so that they are induction-connected (M connection). One end of each layer is exposed to a third side 16 and is connected to a grounding terminal conductor layer 10. The other end is exposed to the fourth side 17 and it linearly extends toward the fourth side 17 from the third side 16. The first and second strip line conductor layers 2 and 3 are interconnected inductively and capacitively. The fist and second additional conductor layers 11a and 11b for changing/adjusting frequency characteristic are provided for the fourth side 17 and are connected to the first and second strip line conductor layers 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency laminated filter for use in a mobile communication device and the like, and a method of adjusting the frequency characteristic.

[0002]

2. Description of the Related Art A plurality of stripline conductor layers juxtaposed to each other, a conductor layer capacitively coupled to an input stage stripline conductor layer, and a conductor layer capacitively coupled to an output stage stripline conductor layer are formed of ceramic. 2. Description of the Related Art A laminated filter having a structure embedded in a dielectric is known. According to this type of laminated filter, a bandpass filter characteristic having a wide bandwidth can be obtained by induction and capacitive coupling between a plurality of stripline conductor layers.

[0003]

The distance between a plurality of stripline conductor layers is determined depending on the printing of a conductive paste on a green sheet (porcelain raw sheet), and the green sheets are laminated and fired. It cannot be adjusted later. Therefore, it was impossible to adjust the frequency characteristics of the completed multilayer filter. For this reason, when a plurality of multilayer filters having different frequency characteristics are required,
It is necessary to change the distance between the stripline conductor layers, that is, the pattern of the conductive paste on the green sheet, and it is difficult to make a laminated filter having the required characteristics in a short time and at low cost. It was difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multilayer filter capable of changing the frequency characteristic without changing the pattern of the stripline conductor layer, and a method of adjusting the frequency characteristic of the multilayer filter.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention provides a first and a second main surfaces and a first and a second main surfaces between the first and the second main surfaces. 2, 3rd and 4th
And a pattern which is juxtaposed with each other as viewed from the first main surface side of the dielectric material and extends in a strip shape from the third side surface toward the fourth side surface. And a plurality of stripline conductor layers embedded in the dielectric and one end of the plurality of stripline conductor layers juxtaposed to each other and capacitively coupled to the stripline conductor layer at one end and connected to the dielectric. A buried first capacitive coupling conductor layer, and a second capacitance buried in the dielectric, which is capacitively coupled to a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed with each other. The coupling conductor layer and the first inside of the dielectric or the first of the dielectric so as to face the plurality of stripline conductor layers.
A ground conductor layer provided on at least one of the first and second main surfaces, and connected to the first and second capacitive coupling conductor layers provided on the first and second side surfaces of the dielectric which oppose each other. First and second input / output terminal conductor layers,
A ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer, wherein one ends of the plurality of strip line conductor layers are respectively connected to the ground terminal conductor layer. The other ends of the plurality of stripline conductor layers are exposed on the fourth side surface facing the third side surface of the dielectric, and a plurality of additional conductor layers are provided on the fourth side surface; Are connected to the other ends of the plurality of stripline conductor layers, respectively, and are capacitively coupled to each other. Claim 2
As shown in (1), an additional conductor layer can be provided on the side of the dielectric where the stripline conductor layer is exposed, and this can be connected to the ground conductor layer. Further, a notch for changing the frequency characteristic can be provided in the ground terminal conductor layer. Further, a notch for changing the frequency characteristics of the ground terminal conductor layer can be provided between the strip line conductor layer and the first or second main surface. When adjusting the frequency characteristics, at least a part of the conductor layer for frequency characteristics adjustment is deleted as described in claims 5 and 6, or the area of the notch portion is determined as described in claims 7 and 8. The ground terminal conductor layer is removed so as to increase.

[0006]

According to the present invention, a plurality of types of laminated filters having different frequency characteristics can be obtained without changing the pattern of the stripline conductor layer inside the dielectric. That is, according to the first and second aspects of the present invention, by providing the additional conductor, it is possible to obtain a multilayer filter having an attenuation characteristic different from that obtained without the additional conductor. According to the third and fourth aspects of the present invention, by providing the cutout for adjusting the frequency characteristic, it is possible to obtain a laminated filter having an attenuation characteristic different from that having no cutout. Further, according to the inventions of claims 5 to 8, a target frequency characteristic can be accurately and easily obtained by trimming after the completion of the multilayer filter.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and embodiments of the present invention will be described below with reference to the drawings.

[0008]

First Embodiment First, a multilayer filter according to a first embodiment and a method of adjusting the frequency characteristic thereof will be described with reference to FIGS. As shown in FIGS. 1 to 3, the laminated filter is formed in a hexahedron having a planar rectangular shape, and includes a ceramic dielectric 1 and first and second stripline conductor layers embedded in the dielectric 1. 2, 3, first and second capacitive coupling conductor layers 4, 5, first and second ground conductor layers 6, 7, and first and second capacities provided on the outer peripheral surface of the dielectric 1.
I / O terminal conductor layers 8 and 9 and ground terminal conductor layer 10
And additional conductor layers 11a and 11b for changing and adjusting the first and second frequency characteristics. In FIGS. 1 and 4, each of the conductor layers 2 to 11b is shown without a thickness, and these conductor layers 2 to 11b are dotted to distinguish them from other regions.

The first and second input / output terminal conductor layers 8, 9 and the first and second ground terminal conductor layers 10, the first and second frequency characteristics change and adjustment from the multilayer filter of FIGS. The laminated body composed of the portions excluding the additional conductor layers 11a and 11b is configured as shown in FIG. 1 when integrated and fired by stacking multiple green sheets
In FIG. 4, the fired dielectric 1 is divided into a plurality of layers corresponding to the green sheets for ease of explanation. In FIGS. 2 and 3, the dielectric 1 is indicated by dotted lines as first to eighth dielectric layers 1.
a to 1h. The first dielectric layer 1a is a cover sheet having no conductor pattern, the second dielectric layer 1b has a first ground conductor layer 6,
The third dielectric layer 1c is a spacer layer based on a plurality of green sheets, and the fourth dielectric layer 1d is composed of the first and second green sheets.
And strip line conductor layers 2 and 3 of
The fifth dielectric layer 1e has first and second capacitive coupling conductor layers 4 and 5, the sixth dielectric layer 1f is a spacer layer based on a plurality of green sheets, and The dielectric layer 1g has the second ground conductor layer 7, and the eighth dielectric layer 1h is a cover sheet. 2 to 4, the thickness of each of the dielectric layers 1a to 1h is schematically shown.

The dielectric 1 has first and second main surfaces 12 and 13 facing each other and first, second, third and fourth side surfaces 1.
It is formed in a hexahedron having 4, 15, 16, and 17.

The first and second strip line conductor layers 2 and 3 have a quarter wavelength (one of the wavelengths of the center frequency of the transmission signal).
/ 4) and parallel to each other on the main surface of the fourth dielectric layer 1d so as to be mutually inductively coupled (M-coupled) when viewed from the first main surface 12 side. And one end thereof is exposed on the third side surface 16 and connected to the ground terminal conductor layer 10, and the other end thereof is exposed on the fourth side surface 17 and the fourth side surface is connected to the fourth side surface 16. It extends linearly toward the side surface 17. If the first and second strip line conductor layers 2 and 3 form an ideal comb line, they do not couple with each other, but actually the distribution of the electromagnetic field is distorted and coupling occurs. . Therefore, the first and second stripline conductor layers 2, 3 are inductively and capacitively coupled to each other.
The first and second capacitive coupling conductor layers 4 and 5 are arranged so as to have a portion overlapping the first and second strip line conductor layers 2 and 3 in a plan view. It is exposed to the second side surfaces 14 and 15 and connected to the first and second input / output terminal conductor layers 8 and 9. The first and second ground conductor layers 6 and 7 are formed so as to cover the first and second strip line conductor layers 2 and 3 in plan view, and one ends of these are exposed on the third side surface 16. Then, they are connected to the ground terminal conductor layer 10, and the other ends thereof are exposed on the fourth side face 17. The first and second input / output terminal conductor layers 8 and 9 are formed in a strip shape on the first and second side surfaces 14 and 15 facing each other, and further extend slightly on the first and second main surfaces 12 and 13. doing. The ground terminal conductor layer 10 has a third side surface 16.
And the first and second main surfaces 12, 13 and the first
And slightly extend to the second side surfaces 14 and 15. Additional conductor layer 11 for changing and adjusting first and second frequency characteristics
a and 11b are provided on the fourth side face 17, and the first and second
Are connected to the strip line conductor layers 2 and 3, respectively. The first and second additional conductor layers 11a and 11b for changing and adjusting the frequency characteristics are coated with a conductive paste in the same manner as the first and second input / output terminal conductor layers 8 and 9 and the ground conductor layer 10. And baked layers.

FIG. 5 shows an equivalent circuit of the multilayer filter shown in FIGS. The first and second terminals T1 and T2 in FIG.
The first and second strip lines L1, L2 correspond to the first and second strip line conductor layers 2, 3, respectively, and correspond to the first and second input / output terminal conductor layers 8, 9, respectively. Capacitors C1 and C2 correspond to the first and second capacitive coupling conductor layers 4 and 5, and the third capacitor C3 corresponds to the first and second capacitance coupling conductor layers.
Additional conductor layers 11a and 11 for changing and adjusting the frequency characteristics of
The ground corresponds to the ground terminal conductor layer 10 corresponding to the capacitance between the terminals b. The first and second strip lines L1, L2 are each equivalent to an LC parallel resonance circuit. The mutual capacitive coupling of the first and second stripline conductor layers 2 and 3 is indicated by Ca, and the inductive coupling is M
Indicated by

The frequency characteristic of the laminated filter having the structure in which the additional conductors 11a and 11b are omitted from FIG. 1 is shown by a solid line 20 in FIG. 6, and the frequency characteristic of the laminated filter in which the additional conductors 11a and 11b are provided according to the present embodiment is shown in FIG. This is the dotted line 21 of FIG. The shift of the frequency characteristic due to the additional conductors 11a and 11b occurs based on the change in the coupling state of the first and second stripline conductor layers 2 and 3 and the effect of equivalently lengthening the stripline by the additional conductors 11a and 11b. ing.
As is apparent from the above, according to the present embodiment, it is possible to obtain a plurality of types of laminated fills having different frequency characteristics without changing the pattern of the conductor layer inside the dielectric 1, shortening the manufacturing time and reducing the cost. Can be reduced.

Since the first and second stripline conductor layers 2 and 3 are formed by printing a conductive paste on a green sheet and firing the green sheet, a desired frequency characteristic may not be obtained. When the characteristic line indicated by the dotted line 21 in FIG. 6 does not match the target characteristic, the additional conductor layer 11a,
11b is deleted by a router or the like so as to reduce this area. As a result, the frequency characteristic changes from the dotted line 21 to the solid line 20. As a result, the production yield can be improved. After the frequency characteristics of the filter have been completed, the side surface 17 of the dielectric 1 is covered with resin, glass, or the like as necessary.

[0015]

Second Embodiment Next, a multilayer filter according to a second embodiment will be described with reference to FIGS. 7 and 8 showing the second embodiment, and FIGS. 10 and 10 showing still another embodiment.
In FIG. 15, portions substantially the same as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted. The multilayer filter shown in FIG. 7 and FIG.
1a and 11b are omitted, and the first and second ground conductor layers 6,
7 except that first and second additional frequency-change and adjustment additional conductor layers 31a and 31b connected to the first side 7 are provided on the fourth side face 17. It has the same configuration as the filter.

The first and second additional conductor layers 31a and 31b for changing and adjusting the frequency characteristics shown in FIGS. 7 and 8 correspond to the first and second strip line conductor layers 2 on the fourth side face 17, respectively.
3 are disposed at positions corresponding to each other between the exposed end faces. That is, the first and second frequency characteristics include a region between the vertical line passing through the right end of the first stripline conductor layer 2 and the vertical line passing through the left end of the second stripline conductor layer 3 in FIG. Adjustment conductor layers 31a and 31b are provided.

The frequency characteristic of the laminated filter having the structure in which the additional conductors 31a and 31b are omitted from FIG. 7 is indicated by a solid line 32 in FIG. 9, and the frequency characteristic of the laminated filter in which the additional conductors 31a and 31b are provided according to the present embodiment is shown in FIG. This is the dotted line 33 of FIG. The change in the frequency characteristics due to the additional conductors 31a and 31b is caused based on the change in the coupling state of the first and second stripline conductor layers 2 and 3 and the change in the capacitance between the stripline conductor layers 2 and 3. As is clear from the above, according to the present embodiment, a plurality of types of multilayer filters having different frequency characteristics can be obtained without changing the pattern of the conductor layer inside the dielectric 1 of the multilayer filter. And cost can be reduced. When the target frequency characteristic is between the dotted line 33 and the solid line 32, a part or all of the additional conductor layers 31a and 31b for changing and adjusting the frequency characteristic are deleted to obtain the target frequency characteristic. . Thereby, an effect that the frequency characteristics can be easily adjusted is obtained.

[0018]

Third Embodiment A multilayer filter according to a third embodiment shown in FIGS. 10 to 13 has a notch for frequency variation and adjustment in the ground terminal conductor layer 10 instead of the additional conductor layers 11a and 11b in FIG. The configuration is substantially the same as that of FIGS. However, in FIGS.
Is provided with a ground terminal conductor layer 10 and the first and second
Of the strip line conductor layers 2 and 3 of the first
The other ends of the second strip line conductor layers 2 and 3 are not exposed to the third side surface 16 of the dielectric 1. Therefore, the surface referred to as the third side in claims 3 and 7 corresponds to the fourth side 17 in FIGS.

The ground terminal conductor layer 10 has a fourth side surface 17.
And extends to a part of the first and second main surfaces 12 and 13 and a part of the first and second side surfaces 14 and 15. The notch 41 for changing and adjusting the frequency characteristic is arranged between the first and second stripline conductor layers 2 and 3, as is apparent from FIG. The notch 41 is provided in advance at the same time as the application of the conductive paste for forming the ground terminal conductor layer 10.

The frequency characteristics in the case where the notch 41 for changing and adjusting the frequency characteristics is not provided in the multilayer filter of FIGS. 10 to 12 are the same as the solid line 32 of FIG. When the notch 41 is provided, the first and second stripline conductor layers 2, 3
The degree of coupling decreases, and the frequency characteristic shifts to the dotted line 33 in FIG. Therefore, according to the third embodiment, similarly to the first and second embodiments, a multilayer filter having a plurality of types of characteristics can be obtained without changing the conductor pattern inside the dielectric 1. , Cost and manufacturing time are achieved. When the pass band width is further narrowed than the dotted line 33 in FIG. 9, the ground terminal conductor layer 10 is deleted so that the area of the notch 41 becomes larger.

[0021]

Fourth Embodiment A multilayer filter according to a fourth embodiment shown in FIGS. 14 and 15 is similar to the third embodiment shown in FIGS.
1 except that a notch 41a is provided in place of the notch 41 of FIG.
0 to FIG. 13. Therefore, the sectional view taken along line DD of FIG. 15 is the same as FIG.

The notch 41a for changing and adjusting the frequency characteristic of the ground terminal conductor layer 10 of the fourth embodiment is provided between the first strip line conductor layer 2 and the first main surface 12. In the case where the frequency characteristic before the notch 41a is provided in FIGS. 14 and 15 is the solid line 42 in FIG. 16, when the notch 41a is provided, the frequency characteristic shifts as shown by a dotted line 43 in FIG. Therefore, according to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained.

[0023]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The number of stripline conductor layers can be three or more. When three or more stripline conductor layers are juxtaposed, one corresponding to the additional conductor layers 11a and 11b for changing and adjusting the frequency characteristics is provided for each, or the frequency characteristics are changed and interposed between each other. A material corresponding to the additional conductor layers 31a and 31b for adjustment or a material corresponding to the cutout portion 41 can be provided. The first and second capacitive coupling conductor layers 4 and 5 are capacitively coupled to the input and output stripline conductor layers. (2) In FIGS. 7 and 8, one of the additional conductor layers 31a and 31b for changing and adjusting the frequency characteristics can be omitted. In FIG. 14, the notch 41 a is provided below the first strip line conductor layer 2, is provided both above and below the first strip line conductor layer 2, or is provided on the second strip line conductor layer 3. Above or below or above and below. (3) A conductor layer for capacitively coupling the first and second stripline conductor layers 2 and 3 to each other inside the dielectric 1 and a conductor layer for obtaining a wavelength shortening effect are additionally provided. be able to. (4) In FIGS. 10 and 14, a ground terminal conductor layer can also be provided on the third side surface 16. (5) First and second stripline conductor layers 2 and 3
At different height positions (different green sheets) of the dielectric 1
Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a multilayer filter according to a first embodiment.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is an exploded perspective view of a dielectric portion of the multilayer filter of FIG.

FIG. 5 is an equivalent circuit diagram of the multilayer filter of FIG. 1;

FIG. 6 is a frequency characteristic diagram of the multilayer filter of FIG. 1;

FIG. 7 is a perspective view illustrating a multilayer filter according to a second embodiment.

FIG. 8 is a right end view of the multilayer filter of FIG. 7;

9 is a frequency characteristic diagram of the multilayer filter of FIG.

FIG. 10 is a perspective view showing a multilayer filter according to a third embodiment.

FIG. 11 is a right side view of FIG.

FIG. 12 is a sectional view taken along line CC of FIG. 11;

FIG. 13 is an exploded perspective view of a dielectric portion of the multilayer filter of FIG.

FIG. 14 is a perspective view illustrating a multilayer filter according to a fourth embodiment.

FIG. 15 is a right side view of FIG.

FIG. 16 is a frequency characteristic diagram of the multilayer filter of the fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dielectric 2, 3 Stripline conductor layer 4, 5 Capacitive coupling conductor layer 6, 7 Ground conductor layer 8, 9 I / O terminal conductor layer 10 Ground terminal conductor layer 11a, 11b Additional conductor layer for frequency characteristic change and adjustment

Claims (8)

[Claims] A first and a second main surface; and a first and a second main surface.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces A first and second input terminals provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. One end of the plurality of stripline conductor layers is connected to the ground. The other end of each of the plurality of stripline conductor layers is connected to a terminal conductor layer, and the other ends of the plurality of stripline conductor layers are exposed on the fourth side surface facing the third side surface of the dielectric, and a plurality of additional conductors are provided on the fourth side surface. A multilayer filter, wherein the plurality of additional conductor layers are connected to the other ends of the plurality of stripline conductor layers, respectively, and are capacitively coupled to each other. 2. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces And a first and second input terminals provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. One end of the plurality of stripline conductor layers is connected to the ground. The other end of the plurality of stripline conductor layers and the other end of the ground conductor layer are connected to a terminal conductor layer, and the other end of the ground conductor layer is exposed on the fourth side surface facing the third side surface. A multilayer filter, wherein an additional conductor layer is provided in a region corresponding to a space between a plurality of stripline conductor layers, and the additional conductor layer is connected to the ground conductor layer. 3. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces A first conductor and a second conductor provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. One end of the plurality of stripline conductor layers is connected to the ground. Connected to a terminal conductor layer, a notch for changing frequency is provided in the ground terminal conductor layer on the third side surface,
The multilayer filter, wherein the cut-out portion for changing frequency characteristics is arranged in a region between one ends of the plurality of stripline conductor layers on the third side surface. 4. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces A first and a second conductive layer provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductive layers. An input / output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. One end of the plurality of stripline conductor layers is The ground terminal conductor layer on the third side surface is connected to the ground terminal conductor layer, and the ground terminal conductor layer on the third side surface is provided with a notch for changing frequency characteristics, and the notch for changing frequency characteristics is provided on the third side surface. A multilayer filter, wherein the filter is arranged in a region between at least one of the plurality of stripline conductor layers and the first and second main surfaces. 5. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces And a first and second input terminals provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer, and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer, wherein one end of the plurality of stripline conductor layers is connected to the ground. The other end of each of the plurality of stripline conductor layers is connected to a terminal conductor layer, and the other end of the plurality of stripline conductor layers is exposed on the fourth side surface facing the third side surface of the dielectric, and the fourth side surface has a plurality of frequency characteristics. An adjustment conductor layer is provided, and the plurality of frequency characteristic adjustment conductor layers are connected to the other ends of the plurality of strip line conductor layers, respectively, and adjust the frequency characteristics of the multilayer filters that are capacitively coupled to each other. When the frequency characteristic adjusting method of a multilayer filter, characterized by partially remove at least one of said first and second frequency characteristic adjusting conductor layer. 6. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces And a first and second input terminals provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer; one end of the plurality of stripline conductor layers is connected to the ground. The other end of the plurality of stripline conductor layers and the other end of the ground conductor layer are connected to a terminal conductor layer, and the other end of the ground conductor layer is exposed on the fourth side surface facing the third side surface. A conductor layer for frequency characteristic adjustment is provided in a region corresponding to between the plurality of stripline conductor layers, and the frequency characteristic of the multilayer filter in which the conductor layer for frequency characteristic adjustment is connected to the ground conductor layer. When adjusting the frequency characteristic adjusting method of a multilayer filter and deletes the frequency characteristic adjusting conductor layer partially. 7. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces A first conductor and a second conductor provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. One end of the plurality of stripline conductor layers is connected to the ground. Connected to a terminal conductor layer, a notch for changing frequency is provided in the ground terminal conductor layer on the third side surface,
When adjusting the frequency characteristics of the multilayer filter in which the frequency characteristic changing notch is disposed in the region between the one ends of the plurality of stripline conductor layers on the third side surface,
A method of adjusting a frequency characteristic of a multilayer filter, wherein a part of the ground terminal conductor layer is deleted so that the area of the frequency characteristic changing notch increases. 8. The first and second main surfaces and the first and second main surfaces.
A dielectric having first, second, third, and fourth side surfaces between main surfaces of the first and second dielectric materials; and a dielectric juxtaposed with each other as viewed from the first main surface of the dielectric and from the third side. A plurality of stripline conductor layers having a pattern extending in a strip shape toward the fourth side surface and embedded in the dielectric; and one of the plurality of stripline conductor layers juxtaposed to each other A first capacitive coupling conductor layer capacitively coupled to a stripline conductor layer at one end and embedded in the dielectric, and a stripline conductor layer at the other end of the plurality of stripline conductor layers juxtaposed to each other A second capacitive coupling conductor layer capacitively coupled to the dielectric and buried in the dielectric; and the first and second dielectrics inside the dielectric or opposed to the plurality of stripline conductor layers. At least one of the main surfaces And a first and second input terminals provided on the first and second side surfaces of the dielectric facing each other and connected to the first and second capacitive coupling conductor layers. An output terminal conductor layer; and a ground terminal conductor layer provided on the third side surface of the dielectric and connected to one end of the ground conductor layer. 3 is connected to the ground terminal conductor layer on the third side surface, and the ground terminal conductor layer on the third side surface is provided with a notch portion for changing frequency characteristics, and the notch portion for changing frequency characteristics is provided on the third side surface. When adjusting the frequency characteristics of a multilayer filter disposed in a region between at least one of a plurality of stripline conductor layers and at least one of the first and second main surfaces, the frequency characteristic changing notch is used. Frequency characteristic adjusting method of a multilayer filter wherein the area of the partially remove the ground terminal conductor layer to increase.