JP2765396B2 - Stripline filter and microstrip line filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a VHF band,
The present invention relates to a stripline filter and a microstripline filter used in the UHF band and the microwave band.

[0002]

2. Description of the Related Art FIG. 16 is a schematic structural view showing a conventional stripline filter disclosed in Japanese Patent Publication No. 2-1163, in which reference numerals 1a and 1b denote a dielectric substrate,
Reference numerals a to 4a denote inner conductors formed by closely attaching a conductive film to one surface of the dielectric substrate 1a, and 5a denote outer conductors formed by closely bonding a conductive film to the entire other surface of the dielectric substrate 1a. Are outer conductors formed by adhering a conductor film to one surface of the dielectric substrate 1b, and 6 to 8 are the dielectric substrates 1a and 1b and the inner conductors 2a to 4a.
And a triplate line resonator 9a comprising outer conductors 5a and 5b. 9a is a groove for adjusting the coupling amount provided by engraving the dielectric substrate 1a at the center between the inner conductors 2a and 3a and 3a and 4a. Are grooves for adjusting the amount of coupling provided by engraving the dielectric substrate 1b at the center between the inner conductors 2b and 3b, and 3b and 4b, and 10 and 11 are the inner conductors 2a and
And input / output lines directly connected to the side surfaces 4a and 4a. The dielectric substrates 1a and 1b are overlapped and bonded so that the grooves 9a and 9b face each other and overlap. Inner conductors 2a-4a
Are set to approximately 1/4 wavelength, and one end is connected to 5a, 5b on the side surfaces of the dielectric substrates 1a, 1b and short-circuited. Therefore, the resonators 6 to 8 are quarter-wavelength resonators having one end short-circuited. In the dielectric substrate 1a, the longitudinal direction of the inner conductor 2a is set to be longer than the dielectric substrate 1b. By arranging these dielectric substrates 1a and 1b so that the short-circuit end sides of the resonators 6 to 8 are aligned, the inner conductor 2a
4a are exposed at the open ends.

Next, the operation will be described. Resonators 6-8
Are adjacent to each other due to the effect of the grooves 9a and 9b, and the coupling amount is adjusted by the depth of the grooves 9a and 9b and the distance between adjacent inner conductors. The amount of input / output coupling is adjusted by changing the connection position between the inner conductors of the input / output lines 10 and 11 and the inner conductors 2a and 4a.

[0004] Now, by adjusting the length of the conductor by trimming the exposed portion of the open end of the inner conductor 2A～4a, all the resonators 6-8 are the same frequency, for example, the resonance at f ₀ If the frequency f ₀ , the resonators 6 to 8 in a resonance state are strongly coupled to each other, and the input to the input / output line 10 is guided to the resonator 6 and the resonator 7 ,
8 and is output from the input / output line 11. However, at frequencies other than f ₀ , the coupling between the resonators 6 to 8 is very weak, and most of the power of the incident wave on the input / output line 10 or 11 is reflected. Thus, FIG.
Has a function as a band-pass filter.

[0005]

Since the conventional stripline filter is constructed as described above, the resonator 6
In order to obtain the coupling between the resonator 7 and the resonator 7 and the resonator 8, it is necessary to provide the grooves 9a and 9b on the dielectric substrate by machining, so that the processing becomes complicated and is not suitable for mass production. There was a problem.

The present invention has been made to solve the above problems, and has as its object to obtain a stripline filter which is easy to process and has excellent mass productivity.

[0007]

According to a first aspect of the present invention, there are provided two dielectric substrates, an outer conductor formed on one surface of each of the two dielectric substrates, and A plurality of inner conductors formed substantially parallel to each other on at least one of the other surfaces, one end of which is connected to the outer conductor to form a short-circuit portion; and the outer conductor, the dielectric substrate, the inner conductor, In the stripline filter in which the dielectric substrate and the outer conductor are stacked in the order of the outer conductor to form a stripline resonator, adjacent inner conductors among the inner conductors are separated from the short-circuit portion by different predetermined distances. A connecting conductor is provided for connecting with each other, and a coupling amount of an adjacent strip line resonator composed of the adjacent inner conductor is adjusted according to a position of the connecting conductor.

According to a second aspect of the present invention, there are provided two dielectric substrates,
An outer conductor formed on one surface of each of the two dielectric substrates and at least one other surface of the dielectric substrates are formed substantially parallel to each other, and one end is connected to the outer conductor. A plurality of inner conductors forming a short-circuited portion, the outer conductor, a dielectric substrate, an inner conductor, a dielectric substrate, a strip line filter that is stacked in the order of the outer conductor,
Among the inner conductors, a connecting conductor for connecting adjacent inner conductors to each other at a position separated by a predetermined distance from the short-circuit portion is provided, and the connecting conductor further includes an inner conductor having a short-circuit portion on the connecting conductor. Have

According to a third aspect of the present invention, there are provided two dielectric substrates,
An outer conductor formed on one surface of each of the two dielectric substrates, and at least one other surface of the dielectric substrates formed radially with one end common and the one end formed of the outer conductor and a plurality of inner conductors forming the connection has been short-circuited portion, said outer conductor, a dielectric substrate, an inner conductor, a dielectric substrate, strip line resonators are stacked in this order of the outer conductor is formed, in the Of the conductors, the adjacent inner conductor is
Connect to each other at the same position at a predetermined distance from the short circuit.
Or a connecting conductor according to claim 1 or 2 .

According to a fourth aspect of the present invention, the dielectric substrate, the outer conductor formed on one surface of the dielectric substrate, and the other surface of the dielectric substrate are formed substantially parallel to each other, and one end is formed. A plurality of inner conductors connected to the outer conductor to form a short-circuit portion; a microstrip line resonator including the dielectric substrate, the inner conductor, and the outer conductor is formed; Connecting conductors are connected to each other at positions different from each other by a predetermined distance from the short-circuit portion, and coupling of resonators of adjacent microstrip lines composed of the adjacent inner conductors is performed depending on the position of the connecting conductor. Adjust the amount.

According to a fifth aspect of the present invention, the dielectric substrate, the outer conductor formed on one surface of the dielectric substrate, and the other surface of the dielectric substrate are formed substantially parallel to each other, and one end is formed. A plurality of inner conductors connected to the outer conductor to form a short-circuit portion; a microstrip line resonator including the dielectric substrate, the inner conductor, and the outer conductor is formed; Connecting conductors are connected to each other at predetermined positions apart from the short-circuit portion, and the connecting conductor further has an inner conductor having a short-circuit portion on the connecting conductor.

According to a sixth aspect of the present invention, a dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and one end commonly formed on the other surface of the dielectric substrate are formed radially.
A plurality of inner conductors, one end of which is connected to the outer conductor to form a short-circuit portion; a microstrip line resonator including the dielectric substrate, the inner conductor, and the outer conductor is formed;
Of the inner conductors, the adjacent inner conductor is
Connecting conductors that connect to each other at the same position separated by a predetermined distance
Alternatively, a connection conductor according to claim 4 or 5 is provided.

[0013]

According to the first aspect of the present invention, in a strip line filter in which an outer conductor, a dielectric substrate, an inner conductor, a dielectric substrate, and an outer conductor are stacked in this order,
Since the connecting conductors for connecting the adjacent inner conductors to each other at predetermined different distances from the short-circuit portion are provided, a desired coupling amount between adjacent resonators can be obtained via the connecting conductors. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Further, since a desired coupling amount can be obtained at a narrow resonator interval, the size of the filter can be reduced.

According to a second aspect of the present invention, in the stripline filter in which the outer conductor, the dielectric substrate, the inner conductor, the dielectric substrate, and the outer conductor are stacked in this order, the adjacent inner conductor among the inner conductors Since connection conductors are provided which are connected to each other at a predetermined distance from the short-circuit portion, and an inner conductor having a short-circuit portion is provided on the connection conductor, a desired conductor between adjacent resonators is provided via the connection conductor. Is obtained. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Further, the coupling at frequencies other than the desired frequency can be suppressed by the inner conductor provided in the connection conductor.

According to a third aspect of the present invention, the two dielectric substrates, the outer conductor formed on one surface of each of the two dielectric substrates, and the other of at least one of the dielectric substrates are provided. A plurality of inner conductors formed radially on the surface, one end of which is connected to the outer conductor to form a short-circuit portion; and the outer conductor, the dielectric substrate, the inner conductor, the dielectric substrate, and the outer conductor are stacked in this order. stripline in the filter, the above comprising
Among the conductors, the adjacent inner conductor is separated from the short-circuit portion by a predetermined distance.
Connection conductors that connect to each other at the same location
Is provided with the connecting conductor according to claim 1 or claim 2 ,
A desired coupling amount between adjacent resonators can be obtained via the connection conductor. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Further, the filter can be downsized by sharing the short-circuit portion.

According to a fourth aspect of the present invention, in a stripline filter forming a resonator of a microstrip line having a dielectric substrate and an inner conductor and an outer conductor, the adjacent inner conductor among the inner conductors is formed by the above-mentioned method. Since the connection conductors are provided at different positions apart from each other by a predetermined distance from the short-circuit portion, a desired coupling amount between adjacent resonators can be obtained via the connection conductors. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Furthermore, since the connection conductor is exposed,
By changing the width of the connection conductor by trimming, the amount of coupling can be easily finely adjusted. In addition, a desired coupling amount can be obtained between narrow resonators, so that the filter can be downsized. When individual connection conductors are used, the position and width of the connection conductor can be easily changed, and the amount of coupling can be easily adjusted.

According to a fifth aspect of the present invention, in a stripline filter forming a resonator of a microstrip line having a dielectric substrate and an inner conductor and an outer conductor, the adjacent inner conductors of the inner conductors are short-circuited. The connection conductors that are connected to each other at a predetermined distance from the portion are provided, and an inner conductor having a short-circuit portion is provided on the connection conductor. Therefore, a desired connection between adjacent resonators is provided through the connection conductor. The amount of binding is obtained. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Furthermore, since the connection conductor is exposed, the width of the connection conductor can be changed by trimming, and the amount of coupling can be easily finely adjusted. Further, the coupling at a frequency other than the desired frequency can be suppressed by the inner conductor provided on the connection conductor.

According to a sixth aspect of the present invention, the outer conductor formed on one surface of the dielectric substrate and the outer conductor formed radially on the other surface of the dielectric substrate and having one end connected to the outer conductor and a short-circuit portion A plurality of inner conductors forming a microstrip line resonator including the outer conductor, the dielectric substrate, and the inner conductor .
Place the conductor at the same position away from the short-circuit by a predetermined distance.
6. A connecting conductor for connecting to each other or claim 4 or claim 5.
Since the connection conductor described is provided, a desired amount of coupling between adjacent resonators can be obtained via the connection conductor. For this reason, it is not necessary to provide a groove for adjusting the coupling amount in the dielectric substrate by machining or the like. Furthermore, since the connection conductor is exposed, the width of the connection conductor can be changed by trimming, and the amount of coupling can be easily finely adjusted. Further, the filter can be downsized by sharing the short-circuit portion.

[0019]

[Embodiment 1] FIG. 1 is a schematic configuration diagram showing Embodiment 1 of the present invention,
In the figure, 1a and 1b are dielectric substrates, 2a to 4a are inner conductors formed by closely attaching a conductive film to one surface of the dielectric substrate 1a, and 2b to 4b are conductors on one surface of the dielectric substrate 1b. An inner conductor 5a is formed by closely adhering the film, and 5a is a dielectric substrate 1a.
Outer conductor formed by closely attaching a conductive film to the entire other surface of
b denotes an outer conductor formed by closely attaching a conductive film to the entire other surface of the dielectric substrate 1b, 6 to 8 denote dielectric substrates 1a and 1b, inner conductors 2a to 4a, 2b to 4b, and outer conductors 5a and 5a. Resonators 10 and 11 of the triplate line composed of 5b are input / output lines in which the inner conductors are directly connected to the inner conductors 2a, 2b, 4a and 4b, respectively, and 12a is the same position of the inner conductor of the dielectric substrate 1a. A connection conductor 12b is formed by closely contacting a conductor film in a direction perpendicular to the inner conductors 2a to 4a for connection, and 12b is perpendicular to the inner conductors 2b to 4b to connect the same position of the inner conductor on the dielectric substrate 1b. The connection conductors 13a to 15a and 13b to 15b formed by closely adhering the conductor films in the directions in which the short-circuit portions are formed. The dielectric substrates 1a and 1b are connected to the inner conductors 2a and 2b.
b, 3a and 3b and 4a and 4b are overlapped so as to face and overlap with each other, and the facing inner conductors are bonded so as to make electrical contact. Inner conductors 2a-4a, 2b-4
b and the connection conductors 12a and 12b are formed of a thin film or a thick film, and are formed by photoetching or the like. The length of each of the inner conductors 2a to 4a is set to about 1/4 wavelength with respect to a desired fundamental wave, and the inner conductors 2a to 4a, 2
One end of each of the outer conductors 5b, 4b is connected to one of the short-circuit portions 13a to 15a, 13b to 15b on the side surface of the dielectric substrate 1a, 1b.
5b. For this reason, the resonators 6 to 8 are 共振 wavelength resonators with one end short-circuited and the other end open. As in the conventional case, the inner conductors 2a to 4
a is set longer than the dielectric substrate 1b. The dielectric substrates 1a and 1b are arranged so that the short-circuit ends of the resonators 6 to 8 are aligned, thereby exposing the open ends of the inner conductors 2a to 4a.

Next, the operation will be described. In the stripline filter, the resonators 6 to 8 have the same frequency f.
If resonates at _0, the resonator 6-8 at the frequency f ₀ is bonded strongly via a connection conductor 12a, 12b, the incident wave to the output line 10 is led to output line 11. However, at frequencies other than f ₀ , the coupling between the resonators is weak, and the incident wave on the input / output line 10 is almost reflected. Thus, the stripline filter of FIG. 1 has a function as a bandpass filter. The amount of coupling between the resonators 6 to 8 can be adjusted by changing the positions of the connection conductors 12a and 12b from the short-circuit end side. Further, the resonance frequency can be easily adjusted by changing the length of the inner conductors 2a to 4a or by bonding a dielectric to the open end. The amount of coupling between the input / output lines 10 and 11 and the resonators 6 and 8 is the input / output line 1
It can be adjusted by changing the connection position between 0, 11 and the inner conductors 2a, 4a. As described above, the stripline filter of FIG. 1 does not require groove processing on the dielectric substrate, and can be manufactured only by processing the outer shape of the dielectric substrates 1a and 1b and etching the conductive film.

Embodiment 2 FIG. FIG. 2 is a schematic configuration diagram illustrating the second embodiment. In the figure, reference numeral 12a denotes a connection conductor formed by closely attaching a conductor film to connect different positions of the inner conductor of the dielectric substrate 1a;
Reference numeral 2b denotes a connection conductor formed by closely attaching a conductive film to connect different positions of the inner conductor of the dielectric substrate 1b.
a, 1b, 2a to 4a, 2b to 4b, 5a, 5b, 6 to
8, 10, 11, 13a to 15a, 13b to 15b and a schematic configuration are the same as those in FIG. Also in this embodiment, the coupling amount between the resonators 6 to 8 depends on the connection conductors 12a and 12a.
It can be adjusted by changing the position of b from the short-circuit end side, and has the same effect as in the first embodiment. Furthermore, in the second embodiment, since the connection conductors 12a and 12b connect the adjacent inner conductors to each other at a position separated by a predetermined distance from the short-circuit portion, a desired coupling amount can be obtained at a narrow resonator interval. And the size of the filter can be reduced.

Embodiment 3 FIG. FIG. 3 is a schematic configuration diagram illustrating the third embodiment. In the figure, 12a is a connection conductor formed by closely attaching a conductor film to connect the inner conductor of the dielectric substrate 1a, and 12b is formed by closely attaching a conductor film to connect the inner conductor of the dielectric substrate 1b. The connection conductor 21a is an inner conductor formed by closely adhering a conductive film so as to have a short-circuit portion on the connection conductor of the dielectric substrate 1a, and 21b has a short-circuit portion on the connection conductor of the dielectric substrate 1b. An inner conductor formed by closely attaching a conductor film to
23 denotes dielectric substrates 1a and 1b and inner conductors 21a and 21b
And an outer conductor 5a, 5b, and a resonator of a triplate line, wherein 1a, 1b, 2a to 4a, 2b to 4b, 5
a, 5b, 6-8, 10, 11, 13a-15a, 13
b to 15b and the schematic configuration are the same as those in FIG. The inner conductors 21a and 21b are set to about 1/12 wavelength with respect to a desired fundamental wave, and are connected to the connection conductors 12a and 12b. Further, the resonators 22 and 23 are 共振 wavelength resonators with one end short-circuited and the other end opened for the third harmonic.

Next, the operation will be described. In the stripline filter, the resonators 6 to 8 have the same frequency f.
If resonates at _0, the resonator 6-8 at the frequency f ₀ is bonded strongly via a connection conductor 12a, 12b, the incident wave to the output line 10 is led to output line 11. However, at frequencies other than f ₀ , the coupling between the resonators is weak, and the incident wave on the input / output line 10 is almost reflected. If the resonators 22 and 23 provided on the connection conductors 12a and 12b resonate at the frequency f ₀ , there is an effect of blocking the third harmonic. Thus, the strip line filter of FIG. 3 has a function as a band pass filter. Resonators 6-8
Can be adjusted by changing the positions of the connection conductors 12a and 12b from the short-circuit end side. Further, the resonance frequency can be easily adjusted by changing the length of the inner conductors 2a to 4a or by bonding a dielectric to the open end. The amount of coupling between the input / output lines 10, 11 and the resonators 6, 8 can be adjusted by changing the connection position between the input / output lines 10, 11 and the inner conductors 2a, 4a. The resonators 22 and 23 can be set to resonate at a predetermined frequency.
A desired frequency can be blocked. As described above, the strip line filter according to the third embodiment does not require the groove processing on the dielectric substrate, and can be manufactured only by the outer shape processing of the dielectric substrates 1a and 1b and the etching processing of the conductive film. Further, the connection conductor 12
The resonators 22 and 23 formed by the inner conductors 21a and 21b provided on a and 12b can suppress coupling at frequencies other than the desired frequency.

Embodiment 4 FIG. FIG. 4 is a schematic configuration diagram showing a fourth embodiment. In the drawing, reference numeral 12a denotes a connection conductor formed by closely adhering a conductor film for connecting an inner conductor of the dielectric substrate 1a, and 12b denotes a dielectric substrate 1b. Is a connection conductor formed by closely adhering a conductor film to connect the inner conductor, and is deformed according to a desired resonator interval and frequency characteristics. Also, 1a, 1
b, 2a to 4a, 2b to 4b, 5a, 5b, 6 to 8, 1
0, 11, 13a to 15a, 13b to 15b and the schematic configuration are the same as those in FIG. This embodiment has the same effect as the second embodiment. Further, in the fourth embodiment, since the connection conductors 12a and 12b used are deformed in accordance with desired characteristics, the shape of the connection conductors 12a and 12b is adjusted so that the resonators 6 to 12b are adjusted.
A desired coupling characteristic can be obtained with a narrow resonator spacing without changing the arrangement of the eight.

Embodiment 5 FIG. FIG. 5 is a schematic configuration diagram illustrating a fifth embodiment. In the figure, 1a and 1b are dielectric substrates, 200a to 700a are inner conductors formed by closely attaching a conductive film to one surface of the dielectric substrate 1a, and 200b to 700b are dielectric substrates 1b.
An inner conductor formed by adhering a conductor film to one surface of
Is an outer conductor formed by closely attaching a conductive film to the entire other surface of the dielectric substrate 1a, 5b is an outer conductor formed by closely bonding a conductive film to the entire other surface of the dielectric substrate 1b, and 200 to 700 are dielectrics. Body substrates 1a, 1b, and inner conductors 200a to 700a, 2
The resonators 10, 10 and 11 of the triplate line composed of the outer conductors 5b and 5b and the outer conductors 5a and 5b respectively
I / O lines in which the inner conductors are directly connected to 00a, 200b, 700a, and 700b, 12a is a connection conductor formed by closely attaching a conductor film to connect different positions of the inner conductor of the dielectric substrate 1a, and 12b is a connection conductor. Connection conductors 13a and 13b are formed by closely adhering conductor films to connect different positions of the inner conductor of the dielectric substrate 1b, and 13a and 13b are short-circuit portions provided at the center of the dielectric substrates 1a and 1b. Dielectric substrates 1a and 1b
Are the inner conductors 200a and 200b, 300a and 300b,
400a and 400b, 500a and 500b, 600a and 600b, and 700a and 700b are overlapped so as to face and overlap with each other, and the facing inner conductors are bonded so as to make electrical contact. Inner conductors 200a to 700a,
200b to 700b and the connection conductors 12a and 12b are formed of a thin film or a thick film, and are formed by photoetching or the like. Inner conductors 200a to 700a, 200b to 7
00b is about 1/4 of the desired fundamental wave in length.
Wavelength, and the inner conductors 200a to 700a, 2
00b to 700b are external conductors 5 at short-circuit portions 13a and 13b each having one end provided at the center of dielectric substrates 1a and 1b.
a, 5b. Therefore, the resonators 200 to
Numeral 700 is a quarter-wave resonator that is short-circuited at one end and opened at the other end. Also in this embodiment, the amount of coupling between the resonators 200 to 700 can be adjusted by changing the positions of the connection conductors 12a and 12b from the short-circuit end side.
It has a similar effect. Further, in the fifth embodiment, the inner conductor 2
Since the short-circuit portions of 00a to 700a and 200b to 700b are shared, the size of the filter can be reduced. In the fifth embodiment, the case where the connection conductors 12a and 12b connect the adjacent inner conductors to each other at a position separated by a predetermined distance from the short-circuit portions 13a and 13b has been described with reference to FIG. With respect to the configuration of 12b, the configuration described in the second or fourth embodiment or the configuration including the resonator described in the third embodiment can be applied. The same effect as described in item 4 can be obtained.

Embodiment 6 FIG. FIG. 6 is a schematic configuration diagram showing a sixth embodiment, in which a microstrip line resonator is used instead of the triplate line resonator of the first embodiment shown in FIG.
In the drawing, 1a is a dielectric substrate, 2a to 4a are inner conductors formed by closely attaching a conductive film to one surface of the dielectric substrate 1a, 5a is a conductive film adhered to the entire other surface of the dielectric substrate 1a. Outer conductors 16-18 are formed on the dielectric substrate 1a.
And micro-strip line resonators 10 and 11 composed of inner conductors 2a to 4a and outer conductor 5a are input / output lines each having an inner conductor directly connected to inner conductors 2a and 4a.
2a is a connection conductor formed by closely attaching a conductor film in a direction orthogonal to the inner conductors 2a to 4a to connect the same position of the inner conductor of the dielectric substrate 1a, and 13a to 15a are short-circuit portions. The inner conductors 2a to 4a and the connection conductor 12a are formed as a thin film or a thick film, and are formed by photoetching or the like. The length of each of the inner conductors 2a to 4a is set to about 1/4 wavelength with respect to a desired fundamental wave. It is connected. Therefore, the resonator 1
Numerals 6 to 18 are quarter-wave resonators which are short-circuited at one end and open at the other end. The sixth embodiment has the same operating principle and advantages as those of the first embodiment shown in FIG.
Since the portion 2a is exposed, there is an effect that the amount of coupling between the resonators can be easily adjusted by trimming the width of the connection conductor 12a.

Embodiment 7 FIG. FIG. 7 is a schematic configuration diagram showing a seventh embodiment, in which a microstrip line resonator is used instead of the triplate line resonator of the second embodiment shown in FIG.
In the figure, reference numeral 12a denotes a connecting conductor formed by closely attaching a conductive film to connect different positions of the inner conductor of the dielectric substrate 1a, and 1a, 2a to 4a, 5a, 16 to 18, 1
0, 11, 13a to 15a and the schematic configuration are the same as those in FIG. The seventh embodiment has the same operation principle and advantages as those of the second embodiment shown in FIG.
Since the portion 2a is exposed, there is an effect that the amount of coupling between the resonators can be easily adjusted by trimming the width of the connection conductor 12a.

Embodiment 8 FIG. FIG. 8 is a schematic configuration diagram showing an eighth embodiment. Instead of the connection conductors 12a formed integrally with the inner conductors 2a to 4a shown in the sixth or seventh embodiment, individual connection conductors 12a are provided.
a is connected to the inner conductors 2a to 4a. The eighth embodiment has the same operating principle and advantages as those of the sixth or seventh embodiment, and also has the effect that the coupling amount can be easily adjusted because the position of the connection conductor 12a is variable.

Embodiment 9 FIG. FIG. 9 is a schematic configuration diagram showing a ninth embodiment, in which a microstrip line resonator is used instead of the triplate line resonator of the third embodiment shown in FIG.
In the figure, reference numeral 12a denotes a connection conductor formed by closely attaching a conductor film to connect the inner conductor of the dielectric substrate 1a;
Are inner conductors formed by closely adhering a conductor film so as to have a short circuit portion on the connection conductor of the dielectric substrate 1a, and 22 and 23 are micro-layers composed of the dielectric substrate 1a, the inner conductor 21a, and the outer conductor 5a. A strip line resonator, 1a, 2a-4
a, 5a, 16 to 18, 10, 11, 13a to 15a and a schematic configuration are the same as those in FIG. In the ninth embodiment,
In addition to having the same operation principle and advantages as those of the third embodiment shown in FIG. 3, since the connection conductor 12a and the inner conductor 21a are exposed, the width of the connection conductor 12a and the like are trimmed to reduce the distance between the resonators. This has the effect that the amount of binding can be easily adjusted.

Embodiment 10 FIG. FIG. 10 is a schematic configuration diagram showing a tenth embodiment, in which a microstrip line resonator is used instead of the triplate line resonator of the fourth embodiment shown in FIG. In the figure, reference numeral 12a denotes a connection conductor formed by closely adhering a conductor film for connecting the inner conductor of the dielectric substrate 1a, which is deformed according to a desired resonator spacing and frequency characteristics. . In addition, 1a, 2a-4a, 5a, 16
To 18, 10, 11, 13a to 15a and the schematic configuration are the same as those in FIG. The tenth embodiment has the same operation principle and advantages as those of the fourth embodiment shown in FIG. 4, and also has the connection conductor 12a exposed since the connection conductor 12a is exposed.
By trimming the width a, there is an effect that the coupling amount between the resonators can be easily adjusted.

Embodiment 11 FIG. FIG. 11 is a schematic configuration diagram showing the eleventh embodiment, in which a microstrip line resonator is used instead of the triplate line resonator of the fifth embodiment shown in FIG. In the figure, 1a is a dielectric substrate, 200a to 700
a is an inner conductor formed by closely attaching a conductive film radially to one surface of the dielectric substrate 1a; 5a is an outer conductor formed by closely bonding a conductive film to the entire other surface of the dielectric substrate 1a; 7
00 is a dielectric substrate 1a and inner conductors 200a to 700a;
Resonators 10 and 11 of the microstrip line composed of the outer conductor 5a are input / output lines in which the inner conductor is directly connected to the inner conductors 200a and 700a, and 12a is a conductor film for connecting different positions of the inner conductor. The connection conductor 13a formed in close contact is a short-circuit portion provided at the center of the dielectric substrate 1a. The inner conductors 200a to 700a and the connection conductor 12a are formed of a thin film or a thick film, and are formed by photo etching or the like. Inner conductors 200a to 700
a is set to about 1/4 wavelength with respect to a desired fundamental wave, and the inner conductors 200a to 700a are connected to the outer conductor 5a at a short-circuit portion 13a having one end provided at the center of the dielectric substrate 1a. Is connected to Therefore, the resonator 2
Reference numerals 00 to 700 are quarter-wavelength resonators that are short-circuited and open at the other end. Also in this embodiment, the resonators 200 to 7
The amount of coupling between 00 and 00 can be adjusted by changing the position of the connection conductor 12a from the short-circuit end side, and has the same effect as in the sixth embodiment. Furthermore, in Example 11, the inner conductor 2
Since the short-circuit portions of 00a to 700a are shared, the size of the filter can be reduced. In the above-described embodiment 11, the connection conductor 12
The case where the inner conductor a is connected to each other at a position separated by a predetermined distance from the short-circuit portion 13a is described with reference to FIG. 11, but the configuration of the connection conductor 12a is described in the above-described embodiment 7 or embodiment 10. The configuration described above, the configuration including the resonator described in the ninth embodiment, and the configuration described in the eighth embodiment can be applied, and the configuration described in the seventh, eighth, ninth, or tenth embodiment is applicable. The same effect can be obtained.

Embodiment 12 FIG. FIG. 12 is a schematic configuration diagram illustrating the twelfth embodiment. In the figure, 1a is a cylindrical dielectric substrate, 2a to 4a are inner conductors formed by closely attaching a conductive film to one surface of the cylindrical dielectric substrate 1a, and 5a is the other surface of the dielectric substrate 1a. Outer conductors formed by closely adhering a conductive film to the whole, 16 to 18 are microstrip line resonators composed of the dielectric substrate 1a, the inner conductors 2a to 4a, and the outer conductor 5a, and 10 and 11 are inner conductors, respectively. Input / output lines in which inner conductors are directly connected to 2a and 4a (however, input / output lines 11 are not shown), 1
Reference numeral 2a denotes a conductor film for connecting the inner conductor to the dielectric substrate 1a.
The connection conductors 13a to 15a formed in close contact with each other are short-circuit portions. The configurations of the above-described sixth to tenth embodiments may be applied to the connection conductor 12a according to the desired resonator spacing and frequency characteristics. Here, a case corresponding to the sixth embodiment is shown. The inner conductors 2a to 4a and the connection conductor 12a are formed of a thin film or a thick film, and are formed by photo etching or the like. The length of each of the inner conductors 2a to 4a is set to about 1/4 wavelength with respect to a desired fundamental wave, and one end of each of the inner conductors 2a to 4a has a short-circuit portion 13a to 15 on the side surface of the dielectric substrate 1a.
a is connected to the outer conductor 5a. For this reason, the resonators 6 to 8 are 共振 wavelength resonators with one end short-circuited and the other end open. This embodiment has the same operating principle and advantages as those of the above-described embodiments 6 to 10, and can realize a small-sized filter by making the dielectric substrate cylindrical.

Embodiment 13 FIG. FIG. 13 is a schematic configuration diagram illustrating the thirteenth embodiment. In the figure, 1a and 1b are dielectric substrates, 20a and 20b are dielectric thin films having dielectric constants different from those of the dielectric substrates 1a and 1b, and 2a to 4a are conductor films on one surface of the dielectric substrate 1a. The inner conductors 2b to 4b are formed by closely attaching a conductive film to one surface of the dielectric substrate 1b, and the inner conductor 5b is formed by forming a conductive film over the entire other surface of the dielectric substrate 1a. The outer conductor formed in close contact, 5b is an outer conductor formed by closely attaching a conductive film to the entire other surface of the dielectric substrate 1b, and 6 to 8 are the dielectric substrates 1a, 1b and the dielectric thin films 20a, 20b.
, Inner conductors 2a-4a, 2b-4b and outer conductors 5a, 5
b, the input / output lines with the inner conductors directly connected to the inner conductors 2a, 2b, 4a, 4b, 13a to 15a, 13b to 15
b is a short-circuit part. The dielectric substrates 1a and 1b and the dielectric thin films 20a and 20b are composed of inner conductors 2a and 2b, 3a and 3
b, 4a and 4b are overlapped so as to face and overlap with each other, and the facing inner conductors are bonded so as to make electrical contact. The inner conductors 2a to 4a and 2b to 4b are formed on the dielectric thin films 20a and 20b, respectively, and the dielectric thin films 20a and 20b are adhered to the dielectric substrates 1a and 1b, respectively. The length of each of the inner conductors 2a to 4a is set to about 1/4 wavelength with respect to a desired fundamental wave, and one end of each of the inner conductors 2a to 4a and 2b to 4b is a dielectric substrate 1a,
The short-circuit portions 13a to 15a and 13b to 15b on the side surface of 1b are connected to the outer conductors 5a and 5b. For this reason,
The resonators 6 to 8 are 短 絡 wavelength resonators with one end short-circuited and the other end open. Note that, as in the conventional case, the dielectric substrate 1a
, The inner conductors 2a to 4a are set longer than the dielectric substrate 1b. The dielectric substrates 1a and 1b are arranged so that the short-circuit ends of the resonators 6 to 8 are aligned, thereby exposing the open ends of the inner conductors 2a to 4a.

Next, the operation will be described. In the above-mentioned stripline filter, the resonators 6 to 8 correspond to the dielectric substrate 1.
Since the phase constants of the even mode and the odd mode are different due to the inhomogeneity due to the difference in the dielectric constant of the dielectric thin films 20a and 20b, coupling between adjacent resonators is obtained. Assuming that the resonators 6 to 8 resonate at the same frequency f ₀ , the resonators 6 to 8 are coupled at the frequency f ₀ , and the incident wave to the input / output line 10 is guided to the input / output line 11. However, at frequencies other than f ₀ , the coupling between the resonators is weak, and the incident wave on the input / output line 10 is almost reflected. Thus, the strip line filter of the thirteenth embodiment shown in FIG. 13 has a function as a band-pass filter. The amount of coupling between the resonators 6 to 8 can be adjusted by changing the distance between the resonators or the thickness of the dielectric thin film. The resonance frequency can be easily adjusted by changing the length of the inner conductors 2a to 4a and 2b to 4b, or by bonding a dielectric to the open end. The amount of coupling between the input / output lines 10 and 11 and the resonators 6 and 8 depends on the input / output lines 10 and 11 and the inner conductors 2a, 2b, 4a and 4b.
It can be adjusted by changing the connection position with the. As described above, the strip line filter of FIG.
No groove processing or connection conductor is required on the dielectric substrate for adjusting the amount of coupling between the substrates, and the outer shape processing of the dielectric substrates 1a and 1b, the etching processing of the conductive film, and the adhesion or deposition of the dielectric thin film are performed. Can be manufactured. Further, by using a material having a small dielectric loss for the dielectric thin film, transmission loss can be suppressed.

Embodiment 14 FIG. FIG. 14 is a schematic configuration diagram illustrating Example 14. In the figure, 1a is a dielectric substrate, 20a is a dielectric thin film having a dielectric constant different from that of the dielectric substrate 1a, and 2a to 4a are the dielectric substrates 1a.
An inner conductor formed by adhering a conductor film to one surface of
Is an outer conductor formed by closely attaching a conductive film to the entire other surface of the dielectric substrate 1a, and 6 to 8 are composed of the dielectric substrate 1a and the dielectric thin film 20a, the inner conductors 2a to 4a, and the outer conductor 5a. Microstrip line resonators 10 and 11 are input / output lines in which the inner conductors are directly connected to the inner conductors 2a and 4a, respectively, and 13a to 15a are short-circuit portions. Inner conductors 2a-4
a is formed on the dielectric thin film 20a.
Is adhered on the dielectric substrate 1a. Inner conductors 2a-4
a has a length set to about 1/4 wavelength with respect to a desired fundamental wave, and one end of each of the inner conductors 2a to 4a is
a. For this reason, the resonators 6 to 8 are 共振 wavelength resonators with one end short-circuited and the other end open. The operation of the fourteenth embodiment is clear from the description of the thirteenth embodiment, and will be omitted. As described above, the microstrip line filter of FIG. 14 does not require groove processing on the dielectric substrate or connection conductor for adjusting the coupling amount between the resonators 6 to 8. Further, by using a material having a small dielectric loss for the dielectric thin film, transmission loss can be suppressed. Also,
In the microstrip line filter of the fourteenth embodiment, the connection conductor 12a and the inner conductor 21 of the sixth to tenth embodiments are used.
a can be formed by exposing a. Therefore, in the microstrip line filter shown in FIG.
0 and the same inner conductor 21
By providing a, the degree of freedom in adjusting the coupling amount can be further increased, and the design and adjustment can be facilitated.

Embodiment 15 FIG. FIG. 15 is a schematic configuration diagram showing a fifteenth embodiment. The configuration for adjusting the coupling amount between the resonators 6 to 8 with the dielectric thin film 20a described in the thirteenth and the fourteenth embodiments is described. This shows a case where the dielectric substrate is applied to a microstrip line filter having a cylindrical dielectric substrate as described in Example 12. In the figure, 1a is a cylindrical dielectric substrate, 20a
Denotes a dielectric thin film provided on a cylindrical dielectric substrate 1a;
2a to 4a are inner conductors formed on the dielectric thin film 20a. The operation of the fifteenth embodiment is described in the first embodiment.
It is clear from the description of 3 and will be omitted. As described above, the microstrip line filter of the fifteenth embodiment has the resonator 6
No groove processing or connection conductor is required on the dielectric substrate for the adjustment of the coupling amount between and ８. Further, by using a material having a small dielectric loss for the dielectric thin film, transmission loss can be suppressed. Furthermore, a compact filter can be realized by making the dielectric substrate cylindrical. In the microstrip line filter of the fifteenth embodiment, since the connection conductors 12a and the inner conductors 21a of the sixth to tenth embodiments can be formed by exposing them, the microstrip line filter shown in FIG. By providing the same connection conductor 12a and inner conductor 21a as in any one of 10, the degree of freedom in adjusting the coupling amount can be further increased, and the design and adjustment can be facilitated.

The configuration provided with the dielectric thin films 20a and 20b described in the above-described embodiments 13 to 15 can be applied to the above-described embodiments 5 and 11, and it is needless to say that the same effect can be obtained. In Example 14 and the like, the inner conductors 2a to 4a were previously placed on the dielectric thin film 20a.
a, outer conductor 5a, short-circuit portions 13a to 15a, input / output line 1
If micropatterns such as 0 and 11 are formed and bonded to the dielectric substrate 1a, a microstrip line filter can be manufactured very easily. In this case, the dielectric thin film 20a is inserted between the dielectric substrate 1a and the outer conductor 5a. In the above embodiment, the case where three resonators are mainly used is shown, but it goes without saying that the present invention can be similarly applied to the case where there are four or more resonators.

[0038]

As is evident from the foregoing description, according to the invention of claims 1 to 6, obtained the desired amount of coupling between adjacent resonators via the connection conductor, produced by etching of the conductive film The amount that can be
There is an effect that a stripline filter or a microstripline filter excellent in productivity can be obtained .

Further, according to the inventions of claims 4 to 6 , since the connecting conductor is exposed, there is an effect that the width of the connecting conductor is changed by trimming to easily finely adjust the coupling amount.

According to the first or fourth aspect of the present invention,
If adjacent inner conductors are
Provide connection conductors that connect to each other at a distance,
Consists of the adjacent inner conductor depending on the position of the connection conductor
Adjacent stripline resonator or microstrip
Since the coupling amount of the line resonator is adjusted, the connection position of the connection conductor is adjusted.
Increases the degree of freedom of location setting, without changing the arrangement of the resonator, can be obtained in a narrow cavity spacing the desired coupling amount via a connection conductor, walk stripline filter
Has the effect of miniaturizing the microstrip line filter.

According to the second or fifth aspect of the present invention,
For example, since there is an inner conductor with a short-circuit on the connection conductor, a strip that suppresses coupling at frequencies other than the desired frequency
Line filter or microstrip line filter
This has the effect of obtaining data .

According to the third or sixth aspect of the present invention,
If the inner conductor is formed radially to share the short circuit
Therefore, stripline filters or microstrip
There is an effect that the top line filter can be formed in a circular shape and can be miniaturized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a fifth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a sixth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram showing a seventh embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing Embodiment 8 of the present invention.

FIG. 9 is a schematic configuration diagram showing Embodiment 9 of the present invention.

FIG. 10 is a schematic configuration diagram showing Embodiment 10 of the present invention.

FIG. 11 is a schematic configuration diagram showing Embodiment 11 of the present invention.

FIG. 12 is a schematic configuration diagram showing Embodiment 12 of the present invention.

FIG. 13 is a schematic configuration diagram showing Embodiment 13 of the present invention.

FIG. 14 is a schematic configuration diagram showing Embodiment 14 of the present invention.

FIG. 15 is a schematic configuration diagram showing Embodiment 15 of the present invention.

FIG. 16 is a schematic configuration diagram showing a conventional stripline filter.

[Explanation of symbols]

 1a, 1b Dielectric substrate 2a-4a, 2b-4b Inner conductor 5a, 5b Outer conductor 6-8 Strip line resonator 9a, 9b Groove 10, 11 Input / output line 12a, 12b Connection conductor 13a-15a, 13b-15b Short-circuit part 16-18 Resonator 20a, 20b Dielectric thin film 21a, 21b Inner conductor 22, 23 Resonator 200a-700a, 200b-700b Inner conductor 200-700 Resonator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-161802 (JP, A) JP-A-61-100002 (JP, A) JP-A-58-127401 (JP, A) JP-A-58-127 141005 (JP, A) Jpn. Showa 62-61507 (JP, U) IEICE 70th Anniversary (1987) Proceedings of National Convention S10-2 (58) Fields surveyed (Int. Cl. ⁶ , DB Name) H01P 1/203 H01P 1/205

Claims (6)

(57) [Claims] 1. Two dielectric substrates, an outer conductor formed on one surface of each of the two dielectric substrates, and at least one other surface of the dielectric substrates is mutually connected to each other. A plurality of inner conductors formed substantially in parallel, one end of which is connected to the outer conductor to form a short-circuit portion, and the outer conductor, the dielectric substrate, the inner conductor, the dielectric substrate, and the outer conductor are stacked in this order. In the stripline filter in which the stripline resonator is formed, a connecting conductor for connecting adjacent inner conductors among the inner conductors at positions different from each other by a predetermined distance from the short-circuit portion is provided. A stripline filter characterized in that the amount of coupling between adjacent stripline resonators composed of adjacent inner conductors is adjusted according to the position of the conductor. 2. The two dielectric substrates, the outer conductor formed on one surface of each of the two dielectric substrates, and the other conductor on at least one of the dielectric substrates. A plurality of inner conductors formed substantially in parallel, one end of which is connected to the outer conductor to form a short-circuit portion, and the outer conductor, the dielectric substrate, the inner conductor, the dielectric substrate, and the outer conductor are stacked in this order. In the stripline filter comprising: a connecting conductor for connecting adjacent inner conductors among the inner conductors at positions separated by a predetermined distance from the short-circuit portion, respectively, further comprising the connecting conductor on the connecting conductor. A stripline filter comprising an inner conductor having a short-circuit portion. 3. Two dielectric substrates, an outer conductor formed on one surface of each of the two dielectric substrates, and one end of at least one of the dielectric substrates on the other surface. A plurality of inner conductors that are radially formed in common and that one end is connected to the outer conductor to form a short-circuit portion; and in the order of the outer conductor, the dielectric substrate, the inner conductor, the dielectric substrate, and the outer conductor. The strip line resonator is formed by being overlapped ,
Among the conductors, the adjacent inner conductor is separated from the short-circuit portion by a predetermined distance.
Connection conductors that connect to each other at the same location
A stripline filter provided with the connection conductor according to claim 1 or 2 . 4. A dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and formed substantially parallel to the other surface of the dielectric substrate, and one end is connected to the outer conductor. A plurality of inner conductors that form a short-circuited portion, a resonator of a microstrip line including the dielectric substrate, the inner conductor and the outer conductor is formed, and among the inner conductors, an adjacent inner conductor is Providing connection conductors that are connected to each other at positions different from each other by a predetermined distance from the short-circuit portion, and adjusting the coupling amount of the resonator of the adjacent microstrip line composed of the adjacent inner conductor according to the position of the connection conductor. A microstrip line filter characterized by the above-mentioned. 5. A dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and formed substantially parallel to the other surface of the dielectric substrate, and one end is connected to the outer conductor. A plurality of inner conductors that form a short-circuited portion, a resonator of a microstrip line including the dielectric substrate, the inner conductor and the outer conductor is formed, and among the inner conductors, an adjacent inner conductor is A microstrip line filter, comprising: connection conductors connected to each other at a predetermined distance from the short-circuit portion; and wherein the connection conductor has an inner conductor having a short-circuit portion on the connection conductor. 6. A dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and a radially formed one end common to the other surface of the dielectric substrate, wherein the one end is formed of the outer conductor. It is connected and a plurality of inner conductors forming a short circuit portion, the dielectric substrate and the inner conductor and the resonator microstrip line comprises an outer conductor is formed, the inner conductor
That is, the adjacent inner conductor is separated from the short-circuit portion by a predetermined distance.
Connecting conductors or claims that connect to each other at the same
A microstrip line filter provided with the connection conductor according to claim 4 .