JPH07249902A - Strip line filter and means for connecting strip line filter and microstrip line - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a stripline filter which is easy to manufacture, whose resonance frequency can be adjusted, and which can be easily connected to a microstripline. [Structure] Outer conductors 2a and 2b are formed on one surface of each of two dielectric substrates 1a and 1b.
a, a plurality of inner conductors 3 on at least one other surface of 1b
Are arranged substantially parallel to each other, extend in a direction perpendicular to the inner conductor 3 in the same plane as the inner conductor 3, and have a substantially rectangular shape continuously formed from one or more end portions of the inner conductor 3. The ground conductor 8 is provided, and the ground conductor 8 and the dielectric substrates 1a and 1b are penetrated and arranged in the longitudinal direction of the ground conductor 8 at an interval of 1/4 wavelength or less, and the outer conductors 2a and 2b and the ground conductor 8b are electrically connected. Through holes 9 for electrically connecting the dielectric substrate 1a
And 1b are overlapped so that the outer conductors 2a and 2b are exposed and the inner conductor 3 is sandwiched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is mainly applied to VHF band, UHF
The present invention relates to a structure of a strip line filter used in a band and a microwave band and a connecting method thereof.

[0002]

2. Description of the Related Art FIG. 18 shows Microwave Jou.
rnal, Nov. 1990, pp. 187-188 is a schematic configuration diagram showing a conventional strip line filter, and FIG. 19 is a diagram showing the shape of an inner conductor pattern. In the figure, 1a and 1b are dielectric substrates, 2a is a dielectric substrate 1a. An outer conductor 2b formed by closely adhering a conductor film on one whole surface of one surface, an outer conductor 2b formed by closely adhering a conductor film on one whole surface of one surface of a dielectric substrate 1b, 3, 6, and 7 dielectrics An inner conductor formed by closely adhering a conductor film to the other surface of the substrate 1a, and 9 is an outer conductor on the inner peripheral surface of a through hole penetrating the dielectric substrates 1a, 1b, outer conductors 2a, 2b, and inner conductor 3. 2a,
2b, a through hole formed by closely adhering a conductor film continuous to the inner conductor 3, 30 is a strip line resonator including the dielectric substrates 1a and 1b, the outer conductors 2a and 2b, and the inner conductor 3, 60 Are the dielectric substrates 1a and 1b and the outer conductor 2a,
2b and an inner conductor 6 are stripline input lines; 70 is a stripline output line, which is composed of dielectric substrates 1a and 1b, outer conductors 2a and 2b, and inner conductor 7, and P
1 is an input end and P2 is an output end. Dielectric substrates 1a and 1
b is overlapped so as to sandwich the inner conductors 3, 6, and 7. The length of each of the plurality of inner conductors 3 is set to about 1/4 wavelength, and one end thereof is connected to the outer conductors 2a and 2b through the through hole 9 and short-circuited. Therefore, the resonator 30 is a quarter-wave resonator in which one end is short-circuited and the other end is open. All of the plurality of resonators 30 are arranged in parallel, and adjacent ones are alternately short-circuited at one end on the opposite side by the through hole 9.

Next, the operation will be described. Since the adjacent resonators 30 are arranged such that the short-circuited end and the open end face each other, they are coupled to each other by an electric field. The amount of coupling is adjusted by the distance between the inner conductors 3 or the width of the inner conductors 3.

Now, assuming that the length of each of the inner conductors 3 is set to a predetermined length in the vicinity of 1/4 wavelength, and all the resonators 30 resonate at the same frequency, for example, f0, that frequency. At f0, the resonators 6 in the resonance state are strongly coupled to each other, and the incident wave to the input line 60 is the resonator 3 in the first stage.
It is guided to 0, and is repeatedly coupled to the adjacent resonator by the electric field, and is output from the input / output line 70. However, at frequencies other than f0, the coupling between the resonators 30 is very weak, and most of the power of the incident wave on the input line 60 is reflected. Thus, the strip line filters shown in FIGS. 18 and 19 have a function as a band pass filter.

[0005]

Since the conventional strip line filter is constructed as described above, the inner conductor 3
The inductance component of the through hole 9 that short-circuits the resonator affects the resonance frequency of the resonator. For this reason, if the shape of the through hole and the attachment of the conductor film are varied due to a processing error, the inductance component of the through hole is also varied, the resonance frequency of the resonator is changed, and the pass and reflection characteristics of the filter are deteriorated. Therefore, there is a problem that it is difficult to manufacture the filter because it is necessary to process the through hole with high accuracy.

Further, in the case of a filter structure in which the first dielectric substrate and the second dielectric substrate are superposed so as to sandwich the inner conductors 3, 6, and 7, the inner conductor 3 is not exposed. The inner conductor 3 cannot be trimmed. For this reason,
There is a problem that it is difficult to adjust the frequency of the resonator 30.

Further, in the case of a filter structure in which the first dielectric substrate and the second dielectric substrate are stacked so as to sandwich the inner conductors 3, 6, and 7, the external microstrip line and the filter are connected. In that case, there is a problem that the discontinuity of modes occurs and the reflection characteristics deteriorate.

The present invention has been made in order to solve the above problems, and provides a strip line filter which is easy to manufacture, can adjust the resonance frequency, and can be easily connected to a microstrip line. The purpose is to get.

[0009]

A stripline filter according to the present invention is formed on a first dielectric substrate, a second dielectric substrate, and one surface of the first dielectric substrate. First outer conductor, a second outer conductor formed on one surface of the second dielectric substrate, and a plurality of inner conductors having predetermined dimensions and arranged substantially parallel to each other. A ground conductor electrically connected to a predetermined end of the inner conductor and extending, and provided in the extending direction of the ground conductor at an interval of 1/4 wavelength or less of the wavelength of the resonance frequency, A connecting means for electrically connecting the ground conductor to the first outer conductor and the second outer conductor; and input / output coupling means for respectively coupling to inner conductors located at both ends of the plurality of inner conductors, The first dielectric substrate and the second dielectric substrate are connected to the first dielectric substrate.
The outer conductor and the second outer conductor are respectively placed outside and the inner conductor and the ground conductor are opposed to each other so as to sandwich them.

According to a second aspect of the present invention, there is provided a strip line filter including a first dielectric substrate, a second dielectric substrate, and a first outer surface formed on one surface of the first dielectric substrate. A first inner conductor composed of a conductor, a second outer conductor formed on one surface of the second dielectric substrate, and a plurality of inner conductors of a predetermined size arranged substantially parallel to each other at a predetermined interval. A first inner conductor and a second inner conductor that is adjacent to the first inner conductor and that includes a plurality of inner conductors that have a predetermined size and that are arranged substantially parallel to each other at a predetermined distance; A ground conductor electrically connected to and extending to predetermined ends of the plurality of inner conductors or predetermined ends of the plurality of inner conductors of the second inner conductor, and a plurality of inner conductors of the first inner conductor Of the first inner conductor and the first inner end of the plurality of inner conductors of the second inner conductor are electrically connected and extend. The common ground conductor shared by the inner conductor and the second inner conductor, and the first dielectric which are provided in the extending direction of the ground conductor and the common ground conductor at intervals of 1/4 wavelength or less of the wavelength of the resonance frequency. Connection means for penetrating the body substrate and the second dielectric substrate to electrically connect the ground conductor to the first outer conductor and the second outer conductor; and the first inner conductor and the second inner conductor. Input / output coupling means for coupling to inner conductors located at both ends of each of the plurality of inner conductors, the first dielectric substrate and the second dielectric substrate, and the first outer conductor. And the second outer conductor are respectively placed outside and the first inner conductor and the second inner conductor are opposed to each other so as to sandwich the ground conductor.

According to a third aspect of the stripline filter, a dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and the other surface of the dielectric substrate at predetermined intervals. A plurality of inner conductors of a predetermined size arranged substantially parallel to each other, a ground conductor electrically connected to a predetermined end of the inner conductor and extending to the other surface of the dielectric substrate, Connection means provided in the extending direction of the ground conductor at intervals of 1/4 wavelength or less of the wavelength of the resonance frequency and electrically connecting the ground conductor to the outer conductor through the dielectric substrate, And an input / output coupling means that couples to the inner conductors located at both ends of the plurality of inner conductors.

A strip line filter according to a fourth aspect of the present invention includes a dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and the other surface of the dielectric substrate at predetermined intervals. A first inner conductor composed of a plurality of inner conductors arranged in substantially parallel to each other and a plurality of predetermined dimensions arranged in substantially parallel to each other on the other surface of the dielectric substrate. A second inner conductor which is made of an inner conductor of the first inner conductor and is disposed adjacent to the first inner conductor, and a predetermined end portion of the plurality of inner conductors of the first inner conductor on the other surface of the dielectric substrate. Alternatively, a ground conductor electrically connected to and extending from predetermined ends of the plurality of inner conductors of the second inner conductor, and a plurality of inner conductors of the first inner conductor on the other surface of the dielectric substrate. Electrically connected to a predetermined end of the conductor and a predetermined end of the plurality of inner conductors of the second inner conductor A common ground conductor to be shared by the first inner conductor and a second inner conductor standing, the wavelength of the resonance frequency to the extending direction of the ground conductor and common grounding conductor
Connection means provided at intervals of 1/4 wavelength or less and penetrating the dielectric substrate to electrically connect the ground conductor to the outer conductor, and the first inner conductor and the second inner conductor, respectively. And an input / output coupling means for coupling to the inner conductors located at both ends of the plurality of inner conductors.

In a strip line filter according to a fifth aspect of the present invention, the connecting means is provided at a position where the distance from the predetermined end of the inner conductor of the earth conductor is 1/4 wavelength or less of the wavelength of the resonance frequency. It is what has been.

In a strip line filter according to a sixth aspect of the present invention, the connecting means includes predetermined end portions of a plurality of inner conductors of the first inner conductor of the earth conductor and common earth conductor and a second inner conductor. The distance from the predetermined ends of the plurality of inner conductors is set at a position not more than 1/4 wavelength of the wavelength of the resonance frequency.

A strip line filter according to a seventh aspect of the present invention includes a first dielectric substrate, a second dielectric substrate having elasticity, and one surface of each of the first and second dielectric substrates. Formed first and second outer conductors, and a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially parallel to each other,
Input / output coupling means, and the first dielectric substrate and the second dielectric substrate are overlapped so that the first and second outer conductors are exposed and the inner conductor is sandwiched. In the strip line filter, the metal rod or the metal screw is inserted into the first or second dielectric substrate from a position facing the inner conductor on the surface of the first or second outer conductor toward the inner conductor. It is a thing.

According to an eighth aspect of the present invention, a stripline filter has a first dielectric substrate, a second dielectric substrate having elasticity, and one surface of each of the first and second dielectric substrates. Formed first and second outer conductors, and a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially parallel to each other,
Input / output coupling means, and the first dielectric substrate and the second dielectric substrate are overlapped so that the first and second outer conductors are exposed and the inner conductor is sandwiched. In the strip line filter, the first or second dielectric substrate may have a dielectric constant different from that of the dielectric substrate from a position facing the inner conductor on the surface of the first or second outer conductor toward the inner conductor. A different dielectric screw is inserted.

A stripline filter according to a ninth aspect of the present invention is formed on a first dielectric substrate, a second dielectric substrate, and one surface of each of the first and second dielectric substrates. The first and second outer conductors, a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel, and the input / output coupling means. In the strip line filter, the first dielectric substrate and the second dielectric substrate are overlapped with each other such that the first and second outer conductors are exposed and the inner conductor is sandwiched. A hole is provided in the first or second dielectric substrate from a position facing the inner conductor on the surface of the first or second outer conductor toward the inner conductor.

According to a tenth aspect of the present invention, there is provided a connecting means for connecting a stripline filter and a microstripline to a first dielectric substrate, a second dielectric substrate, and the first and second dielectric substrates, respectively. First and second outer conductors formed on one surface, and a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel An input / output coupling means having an inner conductor, and an input / output terminal formed by extending an inner conductor of the input / output coupling means, wherein the first dielectric substrate and the second dielectric substrate are A strip line filter formed by overlapping the first and second outer conductors so that the inner conductor is sandwiched, and a third dielectric substrate and one surface of the third dielectric substrate. The formed third outer conductor and the third outer conductor A microstrip line formed of a strip conductor formed on the other surface of the body substrate and a base are provided, and the stripline filter and the microstripline are provided on the base near the input / output terminals of the stripline filter. Is arranged and fixed so that the ends of the microstrip line are close to each other, the input / output terminals of the stripline filter are connected to the strip conductors of the microstripline, and the stripline filter and the microstripline are connected. A metal shim is inserted in the gap.

The stripline filter and the microstripline connecting means according to the invention of claim 11 include a first dielectric substrate, a second dielectric substrate, and the first and second dielectric substrates, respectively. First and second outer conductors formed on one surface, and a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel An input / output coupling means having an inner conductor, and an input / output terminal formed by extending an inner conductor of the input / output coupling means, wherein the first dielectric substrate and the second dielectric substrate are A strip line filter formed by overlapping the first and second outer conductors so that the inner conductor is sandwiched, and a third dielectric substrate and one surface of the third dielectric substrate. The formed third outer conductor and the third outer conductor A microstrip line formed of a strip conductor formed on the other surface of the body substrate and a base are provided, and the stripline filter and the microstripline are provided on the base near the input / output terminals of the stripline filter. Is arranged and fixed so that the ends of the microstrip line are close to each other, the input / output terminals of the stripline filter are connected to the strip conductors of the microstripline, and the stripline filter and the microstripline are connected. The gap is filled with a conductive adhesive.

A stripline filter according to a twelfth aspect of the present invention comprises a first dielectric substrate, a second dielectric substrate, and
First and second outer conductors formed on one surface of each of the first and second dielectric substrates, and formed on the other surface of at least one of the first and second dielectric substrates. And a plurality of inner conductors arranged substantially parallel to each other, an input / output coupling means having the inner conductor, and an input / output terminal formed by extending the inner conductor of the input / output coupling means. The body substrate and the second dielectric substrate to the first and second dielectric substrates.
In the strip line filter, the outer conductor of which is exposed and the inner conductor is superposed so as to be sandwiched,
A connection conductor for connecting the first outer conductor and the second outer conductor is provided near the input / output terminals on the side surfaces of the first and second dielectric substrates.

[0021]

According to the present invention, in the strip line filter, one or a plurality of the inner conductors extending in the same plane as the inner conductors provided substantially parallel to each other extend in the direction perpendicular to the inner conductors. A substantially rectangular ground conductor formed continuously from the end is provided, and the ground conductor and the first and second dielectric substrates are further penetrated at intervals of 1/4 wavelength or less in the longitudinal direction of the ground conductor. Since the short-circuited portion of the inner conductor is formed by providing the connecting means for electrically connecting the provided first and second outer conductors to the ground conductor,
The ground conductor has a lower impedance than the inner conductor, and most of the radio waves propagating through the inner conductor are reflected by the ground conductor and reach the connecting means in a small amount. Therefore, the change in the resonance frequency of the resonator due to the change in the susceptance of the connecting means is small.

A first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, A plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially parallel to each other, and in a direction perpendicular to the inner conductors in the same plane as the inner conductors. A ground conductor that extends and is formed continuously from the end of one or a plurality of the inner conductors, and penetrates the ground conductor and the first and second dielectric substrates. The first and second outer conductors are provided at intervals of 1/4 wavelength or less in the longitudinal direction to electrically connect the first and second outer conductors to the ground conductor, and an input / output coupling means is provided.
And a plurality of strip line filters formed by stacking the dielectric substrate and the second dielectric substrate such that the first and second outer conductors are exposed and the inner conductor is sandwiched between the ground conductor and the strip conductor. Place them close to each other in parallel,
Moreover, since the ground conductor and the connecting means are shared between the two adjacent strip line filters, the two strip line filters can be formed in a small size on the same substrate.

In the microstrip line filter, an end portion of one or a plurality of the inner conductors extending in a direction perpendicular to the inner conductors in the same plane as the inner conductors provided substantially parallel to each other is provided. A substantially rectangular ground conductor that is continuously formed from the outer conductor and the ground conductor that penetrates the ground conductor and the dielectric substrate and is provided at intervals of 1/4 wavelength or less in the longitudinal direction of the ground conductor and the ground conductor. Since the short-circuited portion of the inner conductor is formed by providing the connecting means for electrically connecting the inner conductor and the inner conductor, the ground conductor has a lower impedance than that of the inner conductor, and most of the radio waves propagating through the inner conductor are the ground conductor. A small amount of light is reflected by and reaches the connecting means. Therefore, the change in the resonance frequency of the resonator due to the change in the susceptance of the connecting means is small.

The dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, a plurality of inner conductors formed on the other surface of the dielectric substrate and arranged substantially in parallel, A ground conductor extending in a direction perpendicular to the inner conductor in the same plane as the inner conductor and continuously formed from one or more end portions of the inner conductor, the ground conductor and the dielectric. Through the board and in the longitudinal direction of the earth conductor
A plurality of strip line filters having a connecting means for electrically connecting the outer conductor and the earth conductor, which are provided at intervals of 1/4 wavelength or less, and a plurality of strip line filters are arranged so that the earth conductor is arranged in parallel. Since the ground conductor and the connecting means are shared between the two adjacent strip line filters, the two micro strip line filters can be formed in a small size on the same substrate.

Further, in the strip line filter, it extends in a direction perpendicular to the inner conductor in the same plane as the inner conductor provided substantially in parallel, and from one or a plurality of end portions of the inner conductor. A substantially rectangular ground conductor that is continuously formed is provided, and further, the ground conductor and the first and second dielectric substrates are penetrated, and the ground conductor is provided at intervals of 1/4 wavelength or less in the longitudinal direction of the ground conductor. A short-circuit portion of the inner conductor is formed by providing a connecting means for electrically connecting the first and second outer conductors to the earth conductor, and the inner conductor side of the earth conductor is located from the center of the connecting means. Since the distance to the side surface is provided at a position within a range of 1/4 wavelength or less, the ground conductor has a lower impedance than the inner conductor, and most radio waves propagating in the inner conductor are reflected by the ground conductor. Contact On the amount is small to reach the unit, the amount of change in the susceptance of the connecting means as viewed from the inner conductor side surface of the ground conductor relative to the change in position of the connecting means is reduced. Therefore, the change in the resonance frequency of the resonator due to the change in the susceptance and the change in the position of the connecting means is small.

In the microstrip line filter, an end portion of one or a plurality of the inner conductors extending in a direction perpendicular to the inner conductors in the same plane as the inner conductors provided substantially parallel to each other is provided. A substantially rectangular ground conductor that is continuously formed from the ground conductor and penetrates the ground conductor and the first and second dielectric substrates, and is provided at intervals of 1/4 wavelength or less in the longitudinal direction of the ground conductor. By providing a connecting means for electrically connecting the first and second outer conductors to the earth conductor, a short circuit portion of the inner conductor is formed, and the inner conductor of the earth conductor is centered on the connecting means. Since the distance to the side surface is set to a position within the range of 1/4 wavelength or less, the ground conductor has a lower impedance than the above inner conductor, and most radio waves propagating through the inner conductor are reflected by the ground conductor. On the amount reaching said connecting means is small, the amount of change in the susceptance of the connecting means as viewed from the inner conductor side surface of the ground conductor relative to the change in position of the connecting means is reduced. Therefore, the change in the resonance frequency of the resonator due to the change in the susceptance and the change in the position of the connecting means is small.

Also, the first dielectric substrate, the second dielectric substrate having elasticity, and the first and second outer substrates formed on one surface of each of the first and second dielectric substrates. A first conductor, a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel, and an input / output coupling means. In the strip line filter, the body substrate and the second dielectric substrate are overlapped with each other so that the first and second outer conductors are exposed and the inner conductor is sandwiched between the body substrate and the second dielectric substrate. Since the metal rod or the metal screw is inserted into the second dielectric substrate from the position on the surface of the outer conductor facing the inner conductor, the metal rod or the metal screw is inserted between the metal rod or the metal screw and the inner conductor. For inserting metal rods or screws Produce an electrostatic capacity Flip was. For this reason,
The resonance frequency of the resonator changes according to the insertion amount of the metal rod or metal screw. Also, the metal rod or the metal screw is opened in the second dielectric substrate having elasticity and is pushed or screwed into a prepared hole having a diameter smaller than the respective diameters, whereby the elastic force of the second dielectric substrate is increased. Only fixed by.

Further, the first dielectric substrate, the second dielectric substrate having elasticity, and the first and second outer substrates formed on one surface of each of the first and second dielectric substrates. A first conductor, a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel, and an input / output coupling means. In the strip line filter, the body substrate and the second dielectric substrate are overlapped with each other so that the first and second outer conductors are exposed and the inner conductor is sandwiched between the body substrate and the second dielectric substrate. A dielectric screw having a dielectric constant different from that of the second dielectric substrate was inserted into the second dielectric substrate from a position on the outer conductor surface facing the inner conductor toward the inner conductor. Therefore, the resonance frequency of the resonator changes according to the dielectric constant and the insertion amount of the dielectric screw. Further, the dielectric screw is fixed to the second dielectric substrate having elasticity by being opened in the second dielectric substrate having elasticity and screwed into a prepared hole having a diameter smaller than the diameter of the second dielectric substrate. .

Furthermore, a first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, A plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel;
Input / output coupling means, and the first dielectric substrate and the second dielectric substrate are overlapped so that the first and second outer conductors are exposed and the inner conductor is sandwiched. In the strip line filter, the hole is formed in the first or second dielectric substrate from a position facing the inner conductor on the surface of the first or second outer conductor toward the inner conductor. The dielectric near the conductor is removed and the resonant frequency of the resonator is increased.

Further, the microstrip line is arranged and fixed near the input / output terminals of the stripline filter so that the ends of the microstrip line are close to each other,
Since the input / output terminal of the strip line filter is connected to the strip conductor of the microstrip line, and a metal shim is inserted in the gap between the strip line filter and the microstrip line, the input / output terminal and the ground conductor are The spacing becomes narrower, and the characteristic impedance of the input / output terminals becomes lower. Further, by using the shim having elasticity, it is possible to cope with a change in the distance between the stripline filter and the microstripline.

Further, the microstrip line is arranged and fixed near the input / output terminals of the stripline filter so that the ends of the microstripline are close to each other, and the input / output terminals of the stripline filter are connected to the microstripline. Since it is connected to a strip conductor and the gap between the strip line filter and the microstrip line is filled with a conductive adhesive, the gap between the input / output terminal and the ground conductor is narrowed, and the characteristic impedance of the input / output terminal is reduced. Get lower. Further, by using the conductive adhesive, it is possible to fill even when the shape of the gap between the strip line filter and the microstrip line is complicated.

Furthermore, a first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, A plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel;
An input / output coupling means having an inner conductor and an input / output terminal formed by extending an inner conductor of the input / output coupling means are provided, and the first dielectric substrate and the second dielectric substrate are the first dielectric substrate and the second dielectric substrate, respectively. 1
And a strip line filter in which the second outer conductor is exposed and the inner conductor is sandwiched so as to be sandwiched between the first and second dielectric substrate side surfaces, and the strip line filter is provided near the input / output terminals. Since the connection conductor connecting the first outer conductor and the second outer conductor is provided, when the strip line filter is connected to the microstrip line, the current flowing through the ground conductor of the microstrip line passes through the connection conductor. Since it flows into the upper outer conductor of the strip line filter in the shortest distance, the reflection at this connection point is reduced.

[0033]

【Example】

Example 1. 1 is a schematic configuration diagram showing a first embodiment, and FIG. 2 is a diagram showing a shape of an inner conductor pattern.
a and 1b are dielectric substrates, 2a is an outer conductor having a conductor film formed on the entire one surface of the dielectric substrate 1a, and 2b is the dielectric substrate 1
an outer conductor having a conductor film formed on the entire surface of one side of b, 3, 6,
And 7 are inner conductors made of a conductor film formed on the other surface of the dielectric substrate 1a, 8 is a rectangular ground conductor formed on the other surface of the dielectric substrate 1a and arranged in a direction perpendicular to the inner conductor 3, Reference numeral 9 denotes dielectric substrates 1a and 1b, outer conductors 2a and 2b,
And the outer conductor 2 on the inner peripheral surface of the through hole penetrating the inner conductor 3.
a, 2b, and a through hole formed by closely adhering a conductor film continuous with the ground conductor 8, 30 is a dielectric substrate 1a,
1b, the outer conductors 2a, 2b and the inner conductor 3, a strip line resonator, 60 is a strip line input line composed of the dielectric substrates 1a, 1b, the outer conductors 2a, 2b and the inner conductor 6, 70 is a dielectric substrate 1a, 1b and the outer conductor 2
An output line of a strip line composed of a and 2b and the inner conductor 7, P1 is an input end, and P2 is an output end. The dielectric substrates 1a and 1b are superposed so as to sandwich the inner conductors 3, 6 and 7. Each of the plurality of inner conductors 3 is set to have a length of about 1/4 wavelength, and one end thereof is connected to the outer conductors 2a and 2b by a ground conductor 8 and a through hole 9 to be short-circuited. Therefore, the resonator 30 is a quarter-wave resonator in which one end is short-circuited and the other end is open. All of the plurality of resonators 30 are arranged in parallel, and adjacent ones are alternately short-circuited at one end on the opposite side by the ground conductor 8 and the through hole 9. The through hole 9 is 1 / in the longitudinal direction of the ground conductor 8.
They are arranged at intervals of 4 wavelengths or less.

Next, the operation will be described. Since the adjacent resonators 30 are arranged such that the short-circuited end and the open end face each other, they are coupled to each other by an electric field. The amount of coupling is adjusted by the distance between the inner conductors 3 or the width of the inner conductors 3.

Now, assuming that the length of each of the inner conductors 3 is set to a predetermined length in the vicinity of 1/4 wavelength and all the resonators 30 resonate at the same frequency, for example, f0, At the frequency f0, the resonators 6 in the resonance state are strongly coupled to each other, and the incident wave on the input line 60 is guided to the first-stage resonator 30 and repeatedly coupled to the adjacent resonator by the electric field. It is output from the input / output line 70. However, at frequencies other than f0, the coupling between the resonators 30 is very weak, and most of the power of the incident wave on the input line 60 is reflected. As described above, the stripline filter shown in FIGS. 1 and 2 has a function as a bandpass filter.

FIG. 3 shows an equivalent circuit of the inner conductor pattern of the resonator 30. In the figure, Yo is the characteristic admittance of the resonator 30, Y1 is the characteristic admittance of the ground conductor 8, and jB.
Is the susceptance of the through hole 9 and θ is the through hole 9
Represents the electrical length from the center of to the side surface of the ground conductor 8 on the inner conductor 3 side. At this time, the input admittance Yi viewed from the connection surface between the inner conductor 3 and the ground conductor 8 as viewed from the through hole 9 side is given by the following equation.

[0037]

[Equation 1]

Since the earth conductor 8 is wide, the characteristic admittance Y1 is large. For this reason, the change in the input admittance Yi with respect to the change in the susceptance jB of the through hole 9 becomes smaller from the expression (1). Therefore, in the strip line filter of FIG. 1, even if the value of jB varies due to the variation in processing of the through hole 9, variation in the resonance frequency of the resonator 30 can be reduced, and stable characteristics can be obtained.

FIG. 4 is a diagram showing the relationship between the distance h from the center of the through hole 9 to the inner conductor side surface of the ground conductor and the resonance frequency of the resonator, which is the numerical calculation result by the boundary element method. As can be seen from the figure, the larger the value of h, the smaller the amount of change in the resonance frequency with respect to the change in the position of the through hole 9. On the other hand, when h is 1/4 wavelength or more, radio waves can be propagated in the longitudinal direction of the ground conductor. Therefore, h ≦
By setting the position of the through hole 9 so that h becomes large in the range of (1/4 wavelength), the through hole 9
It is possible to reduce the deterioration of the characteristics of the filter due to the change in position.

Example 2. FIG. 5 is a schematic configuration diagram showing a second embodiment. A capacitor 1 is formed by short-circuiting the ends of a plurality of inner conductors 3 on the same side and projecting an earth conductor 8 at the open end.
This is the case where 0 is provided.

Adjacent resonators 30 are arranged so that their short-circuited ends and open-ended ends face each other, and capacitor 10
Due to the effect, the resonator length is set shorter than 1/4 wavelength, so they are mutually coupled by the magnetic field. The amount of coupling is 3
It is adjusted by the interval of or the width of the inner conductor 3.

Now, assuming that the length of each inner conductor 3 is set to a predetermined length shorter than 1/4 wavelength and all the resonators 30 resonate at the same frequency, for example, f0, At the frequency f0, the resonators 30 in the resonance state are strongly coupled to each other, the incident wave on the input line 60 is guided to the resonator 30 at the first stage, and is coupled to the adjacent resonator 30 by the electric field. The magnetic field is coupled to the three adjacent resonators by the magnetic field, and is coupled to the fourth adjacent resonator by the electric field and is output from the input / output line 70. However, at frequencies other than f0, the coupling between the resonators 30 is very weak, and most of the power of the incident wave on the input line 60 is reflected.
Thus, the stripline filter shown in FIG. 5 has similar operating principles and advantages as the filter of FIG.

Example 3. FIG. 6 is a schematic configuration diagram showing a third embodiment, which is a case where the two filters shown in FIG. 1 or 5 are formed on the same dielectric substrate 1a, 1b. The ground conductor 8 and the through hole 9 provided between the two filters are shared by the two filters.

The embodiment shown in FIG. 6 has the same operating principle and advantages as those shown in FIGS. 1 and 5, and also has the advantage that a plurality of filters can be formed in a small size on the same substrate.

Example 4. FIG. 7 is a schematic configuration diagram showing the fourth embodiment, and is a case where a microstrip line resonator 300 is used instead of the strip line resonator 30.

The embodiment of FIG. 7 has the same operating principle and advantages as those of FIG. 1, and since the inner conductor 3 is exposed, the length of the inner conductor 3 is shortened by trimming or the like. This has the advantage that the resonance frequency of the resonator 300 can be easily adjusted.

Example 5. FIG. 8 is a schematic configuration diagram showing a fifth embodiment, and two dielectric substrates 1 in which the filters in FIG. 7 are the same.
This is the case when it is formed on a. The ground conductor 8 and the through hole 9 provided between the two filters are shared by the two filters.

The embodiment shown in FIG. 8 has the same operating principle and advantages as those shown in FIG. 6, and since the inner conductor 3 is exposed, the length of the inner conductor 3 is shortened by trimming or the like. This has the advantage that the resonance frequency of the resonator 300 can be easily adjusted.

Example 6. FIG. 9 is a schematic configuration diagram showing a sixth embodiment, in which 1b is a dielectric substrate having elasticity,
Reference numeral 11 is a metal screw inserted into the dielectric substrate 1b from a position facing the open end of the inner conductor 3 on the surface of the outer conductor 2b. Reference numerals 90a and 90b are provided on the side surfaces of the dielectric substrates 1a and 1b. , And a short-circuit conductor for connecting the ground conductor 8 to each other, and others are the same as in the case of FIG. The metal screw 11 is screwed into a prepared hole having a smaller diameter than itself, and is sufficiently fixed only by the elasticity of the dielectric substrate 1b.

The metal screw 11 and the inner conductor 3 facing the metal screw 11
An electric field is concentrated between the open end and the capacitor to form a capacitor, and the capacitance of the capacitor increases as the distance between the metal screw and the inner conductor 3 decreases. Therefore, by adjusting the insertion amount of the metal screw from the outside of the filter, the resonator 3
The resonance frequency of 0 can be continuously changed.

The stripline filter shown in FIG. 9 has a function as a bandpass filter similarly to the filter of FIG. 1, and the resonance frequency of the resonator can be easily adjusted with a metal screw, and a resonance frequency adjusting mechanism is provided. It has the advantage of being compact.

Example 7. FIG. 10 is a schematic configuration diagram showing a seventh embodiment, in which a metal rivet 2 is used instead of the metal screw 11.
This is the case where the configuration is made using 3.

The embodiment shown in FIG. 10 has the same operating principle and advantages as those shown in FIG. 8, and has the advantage that the contact surface with the outer conductor 2b can be wide and sufficient contact can be obtained, resulting in low loss. Have.

Example 8. FIG. 11 is a schematic configuration diagram showing the eighth embodiment, which is a case where a dielectric screw 24 having a dielectric constant different from that of the dielectric substrate 1b is used instead of the metal screw 11. Since the electric field is concentrated at the open end of the inner conductor 3,
When the dielectric screw 24 is inserted here, the resonance frequency of the resonator 30 changes according to the dielectric constant of the dielectric screw and the insertion length.
Therefore, the resonance frequency of the resonator 30 can be continuously changed by adjusting the insertion amount of the dielectric screw 24 from the outside of the filter.

The stripline filter shown in FIG. 11 has a function as a bandpass filter similarly to the filter of FIG. 1, and the resonance frequency of the resonator can be easily adjusted by the dielectric screw 24, and the resonance frequency can be adjusted. This has the advantage that the mechanism can be made compact.

Example 9. FIG. 12 is a schematic configuration diagram showing the ninth embodiment, in which the holes 25 are provided in the dielectric substrate 1b instead of inserting the metal screws 11. Since the hole 25 is sufficiently smaller than the wavelength, there is almost no leakage of radio waves.

The stripline filter shown in FIG. 12 has a function as a bandpass filter similarly to the filter of FIG. 1, and since the dielectric near the inner conductor 3 is removed by the hole 25, the wavelength shortening rate is changed. The advantage is that the resonance frequency of the resonator can be easily set high and the resonance frequency adjusting mechanism can be made compact.

Example 10. 13 is a schematic configuration diagram showing an embodiment 10, in which 12 is a metal shim, 13
Is a through hole, 14 is a strip conductor, 15 is a dielectric substrate, 16 is a metal base, 17 is an input / output terminal, 100 is a filter composed of a triplate line, 140 is a strip conductor 14 and a dielectric substrate 15. Microstrip lines P1 and P2 configured with the base 16 are terminals. The input / output terminal 17 is formed by extending the inner conductor of the input / output line of the filter 100. The through hole 13 is provided near the input / output terminal 17 and connects the outer conductor 2b of the filter 100 and the base 16. One filter 10
0 and two microstrip lines 140 are arranged and fixed on the base 16 so that the input / output terminal 17 of the filter 100 and one end of the microstrip line 140 are close to each other. The tips of the input / output terminals are connected to the strip conductor 14 of the microstrip line 140. Sim 1
Reference numeral 2 has the shape shown in FIG. 14, and is inserted in the gap between the filter 100 and the microstrip line 140.

In the configuration shown in FIG. 13, the filter 1 is generally used.
Dielectric substrate and microstrip line 14
Since the dielectric substrate used for 0 has a different thickness, a step is provided on the base so that the input / output terminal 17 and the strip conductor are on the same plane. Considering the processing accuracy of the step and the difference in expansion coefficient between the filter 100 and the base 16 depending on the temperature, it is necessary to previously provide a gap between the step of the base 16 and the filter 100. At this time, since the input / output terminal 17 is arranged so as to straddle this gap, there is no dielectric around the input / output terminal 17, and the characteristic impedance of the line increases, which causes deterioration of the reflection characteristic of the circuit. By inserting the shim 12 into this gap, the base 16 equivalently approaches the input / output terminal 17 and the characteristic impedance is lowered, so that the reflection characteristic of the circuit is improved. Since the shim 12 has a leaf spring shape as shown in FIG. 14, it can be inserted even when the gap width changes due to a processing error.

Example 11. FIG. 15 is a schematic configuration diagram showing an eleventh embodiment, which is a case where a conductive adhesive 18 is filled instead of the shim 12 in FIG.

The embodiment of FIG. 15 has the same operating principle and advantages as those of the embodiment of FIG.
It has the advantage that it can be filled even when the distance between the microstrip line and the microstrip line has a complicated shape.

Example 12 16 is a schematic configuration diagram showing a twelfth embodiment, in which 13 is a through hole provided near the input line 60 and the output line 70, 19 is a connecting conductor, 20 is a metal cap, 21 is a conductor plate, and 100 is a conductor plate.
Is the strip line filter shown in the embodiment of FIG. 1, and other reference numerals are the same as those in FIG. Note that the output line 70 side is the same as the input line 60 side, and is not shown. Through hole 13 is dielectric substrate 1
It is provided so as to penetrate through a and connects the outer conductor 2a and the ground conductor 8. The connection conductor 19 is formed by side surface plating in the vicinity of the input / output terminal 17 on the side surface of the dielectric substrate 1a.
It is continuous with the ground conductor 8. The metal cap 20 is provided so as to cover the inner conductors of the input line 60 and the output line 70 which are exposed by hollowing out the dielectric substrate 1b, and the upper surface thereof is flush with the surface of the outer conductor 2b. The conductor plate 21 is provided in close contact so as to straddle the metal cap and the outer conductor 2b.

When the stripline filter of FIG. 16 is connected to an external microstripline, the current flowing through the ground conductor of the microstripline is the outer conductor 2a, the connection conductor 19, the ground conductor 8, the metal cap 20, and the conductor plate 21. Since it is propagated to the outer conductor 2b via the shortest distance via, the mode of the radio wave propagating through the microstrip line is easily converted to the mode of the radio wave propagating through the triplate strip line. Therefore, connection with the microstrip line is possible with almost no reflection.

Example 13. FIG. 17 is a schematic configuration diagram showing the thirteenth embodiment, in which the connection conductor 22 is used instead of the metal cap 20 and the conductor plate 21. The connection conductor 22 is formed by side surface plating in the vicinity of the input / output terminal 17 on the side surface of the dielectric substrates 1a and 1b, and connects the outer conductors 2a and 2b. The through hole 13 is provided so as to penetrate the dielectric substrates 1a and 1b, and connects the outer conductors 2a and 2b.

When the stripline filter of FIG. 17 is connected to an external microstripline, the current flowing through the ground conductor of the microstripline is transmitted from the outer conductor 2a to the outer conductor 2b via the connecting conductor 22 at the shortest distance.
The mode of the radio wave propagating through the microstrip line is easily converted to the mode of the radio wave propagating through the triplate-type strip line. Therefore, as in the embodiment of FIG.
It can be connected to a microstrip line with almost no reflection.

[0066]

As described above, according to the invention of claim 1, the change in the resonance frequency of the resonator due to the change in the susceptance of the connecting means is small, the processing accuracy of the connecting means is relaxed, and the strip line filter is easy to manufacture. There is an effect that can be obtained.

According to the second aspect of the invention, the first inner conductor and the second inner conductor are arranged adjacent to each other, and the common ground conductor shared by the first inner conductor and the second inner conductor is provided. There is an effect that a plurality of strip line filters can be formed in a small size on the same substrate.

According to the third aspect of the invention, since the inner conductor is exposed, it is possible to obtain a stripline filter in which trimming can be performed and the resonance frequency of the resonator can be easily adjusted.

According to the invention of claim 4, a plurality of strip line filters can be formed in a small size on the same substrate, and
Since the inner conductor is exposed, it is possible to obtain a stripline filter in which trimming or the like can be performed and the resonance frequency of the resonator can be easily adjusted.

According to the inventions of claims 5 and 6,
Since the connecting means is provided at a position where the distance from the predetermined end of the inner conductor of the earth conductor is not more than 1/4 wavelength of the wavelength of the resonance frequency, the electric wave propagating through the earth conductor is blocked and reduced,
There is an effect that a stripline filter with reduced loss can be obtained.

According to the seventh aspect of the invention, since the metal rod or the metal screw is inserted into the dielectric substrate having elasticity to adjust the resonance frequency of the resonator, the metal rod or the metal screw causes the elastic force of the dielectric substrate. There is an effect that a strip line filter, which is fixed only by itself and whose resonance frequency is easily adjusted, can be formed in a small size.

According to the invention of claim 8, the resonance frequency of the resonator is adjusted by inserting a dielectric screw having a dielectric constant different from that of the dielectric substrate, so that the strip line filter whose resonance frequency can be easily adjusted is made small. There is an effect that can be configured.

According to the ninth aspect of the invention, since the hole is provided at the position facing the predetermined inner conductor of the dielectric substrate, the resonance frequency of the resonator can be easily increased.

According to the tenth aspect of the invention, since the metal shim is inserted in the gap between the stripline filter and the microstripline, the characteristic impedance of the input / output terminal can be lowered and the reflection characteristic of the circuit can be improved. .

According to the eleventh aspect of the present invention, since the conductive adhesive is filled in the gap between the strip line filter and the microstrip line, the characteristic impedance of the input / output terminal can be easily lowered even when the shape of the gap is complicated. This has the effect of improving the reflection characteristics of the circuit.

According to the twelfth aspect of the invention, since the connection conductor for connecting the first outer conductor and the second outer conductor is provided near the input / output terminal, the current flowing through the ground conductor of the microstrip line is Since it travels from the first outer conductor to the second outer conductor through the connecting conductor in the shortest distance, it facilitates the conversion of the mode of the radio wave propagating through the microstrip line into the mode of the radio wave propagating through the triplate-type strip line, There is an effect that a stripline filter with reduced reflection can be obtained.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an inner conductor pattern of Example 1 of FIG.

FIG. 3 is a diagram showing an equivalent circuit of the resonator of the first embodiment shown in FIG.

FIG. 4 is a diagram showing a relationship between a through hole position dimension h of the resonator of FIG. 3 and a resonance frequency.

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

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

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

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

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

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

FIG. 11 is a schematic configuration diagram showing an eighth embodiment of the present invention.

FIG. 12 is a schematic configuration diagram showing Embodiment 9 of the present invention.

FIG. 13 is a schematic configuration diagram showing Embodiment 10 of the present invention.

FIG. 14 is a configuration diagram showing a detailed portion of embodiment 10 of the present invention.

FIG. 15 is a schematic configuration diagram showing an eleventh embodiment of the present invention.

FIG. 16 is a schematic configuration diagram showing Embodiment 12 of the present invention.

FIG. 17 is a schematic configuration diagram showing Embodiment 13 of the present invention.

FIG. 18 is a schematic configuration diagram showing a conventional stripline filter.

FIG. 19 is a diagram showing an inner conductor pattern of a conventional stripline filter.

[Explanation of symbols]

 1a, 1b, 15 Dielectric substrate 2a, 2b Outer conductor 3 Inner conductor 6,60 Input line 7, 70 Output line 8 Earth conductor 9, 13 Through hole 30 Strip line resonator 300 Microstrip line resonator 600 Microstrip Input line of the line 700 Output line of the microstrip line 11 Metal screw 23 Rivet 24 Dielectric screw 25 Hole 12 Shim 14 Strip conductor 16 Base 17 Input / output terminal 18 Conductive adhesive 140 Microstrip line 100 Strip line filter 19, 22 Connection conductor 20 Metal cap 21 Conductor plate P1, P3 input end P2, P4 output end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Takeuchi 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Communication Equipment Works

Claims (12)

[Claims] 1. A first dielectric substrate, a second dielectric substrate, and a first dielectric substrate formed on one surface of the first dielectric substrate.
Outer conductor, a second outer conductor formed on one surface of the second dielectric substrate, a plurality of inner conductors of a predetermined size arranged substantially parallel to each other at a predetermined distance, and A ground conductor that is electrically connected to a predetermined end of the conductor and extends, and 1/4 of the wavelength of the resonance frequency in the extending direction of the ground conductor.
The ground conductors are provided at intervals less than or equal to the wavelength and
The first dielectric substrate, further comprising connecting means for electrically connecting to the outer conductor and the second outer conductor, and input / output coupling means for respectively coupling to inner conductors located at both ends of the plurality of inner conductors. And a second dielectric substrate formed so that the first outer conductor and the second outer conductor are outside and the inner conductor and the ground conductor are opposed to each other so as to face each other. . 2. A first dielectric substrate, a second dielectric substrate, and a first dielectric substrate formed on one surface of the first dielectric substrate.
First outer conductor, a second outer conductor formed on one surface of the second dielectric substrate, and a plurality of inner conductors of a predetermined size arranged substantially parallel to each other at a predetermined interval. Inner conductor and a plurality of inner conductors having a predetermined size and arranged substantially parallel to each other at a predetermined distance, a second inner conductor disposed adjacent to the first inner conductor, and the first inner conductor. A ground conductor electrically connected to and extending at predetermined ends of the plurality of inner conductors of the conductor or at predetermined ends of the plurality of inner conductors of the second inner conductor;
The first inner conductor and the first inner conductor extending electrically connected to predetermined ends of the plurality of inner conductors of the first inner conductor and predetermined ends of the plurality of inner conductors of the second inner conductor. A common ground conductor shared by the two inner conductors, and the first dielectric substrate and the first dielectric substrate, which are provided in the extending direction of the ground conductor and the common ground conductor at intervals of 1/4 wavelength or less of the wavelength of the resonance frequency. Two
A plurality of connecting means for penetrating the dielectric substrate to electrically connect the ground conductor to the first outer conductor and the second outer conductor, and a plurality of the first inner conductor and the second inner conductor. Input / output coupling means for respectively coupling to inner conductors located at both ends of the inner conductor, the first dielectric substrate and the second dielectric substrate are connected to the first outer conductor and the second outer substrate. A strip line filter, characterized in that the conductors are respectively arranged on the outer side and faced with the first inner conductor and the second inner conductor so as to sandwich the ground conductor. 3. A dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and predetermined dimensions that are arranged substantially parallel to each other on the other surface of the dielectric substrate at predetermined intervals. A plurality of inner conductors, a ground conductor electrically extending to the other surface of the dielectric substrate at a predetermined end of the inner conductor, and a resonance frequency in the extending direction of the ground conductor. Of 1/4 wavelength or less of the wavelength of, the connecting means for penetrating the dielectric substrate and electrically connecting the ground conductor to the outer conductor, and the inner means located at both ends of the plurality of inner conductors. A stripline filter comprising: input / output coupling means coupled to each conductor. 4. A dielectric substrate, an outer conductor formed on one surface of the dielectric substrate, and predetermined dimensions that are arranged substantially parallel to each other on the other surface of the dielectric substrate at predetermined intervals. A first inner conductor formed of a plurality of inner conductors and a plurality of inner conductors of a predetermined size arranged substantially parallel to each other on the other surface of the dielectric substrate. A second inner conductor disposed adjacent to the inner conductor, and a predetermined end portion of the plurality of inner conductors of the first inner conductor or a plurality of inner conductors of the second inner conductor on the other surface of the dielectric substrate. A ground conductor electrically connected to a predetermined end of the conductor and extending, and a predetermined end of the plurality of inner conductors of the first inner conductor and a second conductor on the other surface of the dielectric substrate. The inner conductor is shared by the first inner conductor and the second inner conductor which are electrically connected to and extend at predetermined end portions of the plurality of inner conductors. A common ground conductor, and the ground conductor and the common ground conductor are provided at intervals of not more than 1/4 wavelength of a resonance frequency in the extending direction of the common ground conductor and penetrate the dielectric substrate to connect the ground conductor to the outer conductor. And an input / output coupling means respectively coupled to inner conductors located at both ends of the plurality of inner conductors of the first inner conductor and the second inner conductor. Characteristic stripline filter. 5. The distance of the connecting means from the predetermined end of the inner conductor of the earth conductor is 1 / wavelength of the resonance frequency.
The strip line filter according to claim 1 or 3, wherein the strip line filter is provided at a position of 4 wavelengths or less. 6. The connecting means comprises predetermined ends of the plurality of inner conductors of the first inner conductor of the ground conductor and common ground conductor and predetermined ends of the plurality of inner conductors of the second inner conductor. The strip line filter according to claim 2 or 4, wherein the strip line filter is provided at a position at a distance of 1/4 wavelength or less of the wavelength of the resonance frequency. 7. A first dielectric substrate and a second dielectric substrate having elasticity, and first and second outer conductors formed on one surface of each of the first and second dielectric substrates. And a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel, and an input / output coupling means. In the strip line filter, the substrate and the second dielectric substrate are overlapped so that the first and second outer conductors are exposed and the inner conductor is sandwiched. A strip line filter, characterized in that a metal rod or a metal screw is inserted into the first or second dielectric substrate from a position on the surface of the conductor facing the inner conductor toward the inner conductor. 8. A first dielectric substrate and a second dielectric substrate having elasticity, and first and second outer conductors formed on one surface of each of the first and second dielectric substrates. And a plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially in parallel, and an input / output coupling means. In the strip line filter, the substrate and the second dielectric substrate are overlapped so that the first and second outer conductors are exposed and the inner conductor is sandwiched. A strip line in which a dielectric screw having a dielectric constant different from that of the dielectric substrate is inserted into the first or second dielectric substrate from a position on the conductor surface facing the inner conductor toward the inner conductor. filter. 9. A first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, A plurality of inner conductors formed on the other surface of at least one of the first and second dielectric substrates and arranged substantially parallel to each other; and input / output coupling means, and the first dielectric substrate. In the strip line filter, wherein the second dielectric substrate is laminated so that the first and second outer conductors are exposed and the inner conductor is sandwiched, the first or second stripline filter is provided.
A strip line filter having a hole in the first or second dielectric substrate from a position on the surface of the outer conductor facing the inner conductor toward the inner conductor. 10. A first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, First above
And a plurality of inner conductors formed on the other surface of at least one of the second dielectric substrates and arranged substantially in parallel, an input / output coupling means having the inner conductors, and an inner conductor of the input / output coupling means. An input / output terminal formed by extension is provided, and the first and second outer conductors are exposed and the inner conductor is sandwiched between the first and second dielectric substrates. Strip line filter,
A micro including a third dielectric substrate, a third outer conductor formed on one surface of the third dielectric substrate, and a strip conductor formed on the other surface of the third dielectric substrate. A strip line and a base are provided, and the strip line filter and the microstrip line are arranged on the base so that the ends of the microstrip line are close to the input / output terminals of the strip line filter. Fix, connect the input and output terminals of the strip line filter to the strip conductor of the micro strip line,
A connecting means for connecting the strip line filter and the micro strip line, wherein a metal shim is inserted in a gap between the strip line filter and the micro strip line. 11. A first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, First above
And a plurality of inner conductors formed on the other surface of at least one of the second dielectric substrates and arranged substantially in parallel, an input / output coupling means having the inner conductors, and an inner conductor of the input / output coupling means. The first and second outer conductors are exposed and the inner conductor is sandwiched between the first and second dielectric substrates including the extended input / output terminals. Strip line filter,
A micro including a third dielectric substrate, a third outer conductor formed on one surface of the third dielectric substrate, and a strip conductor formed on the other surface of the third dielectric substrate. A strip line and a base are provided, and the strip line filter and the microstrip line are arranged on the base so that the ends of the microstrip line are close to the input / output terminals of the strip line filter. Fix, connect the input and output terminals of the strip line filter to the strip conductor of the micro strip line,
A connecting means for connecting the strip line filter and the microstrip line, wherein a gap between the strip line filter and the microstrip line is filled with a conductive adhesive. 12. A first dielectric substrate, a second dielectric substrate, first and second outer conductors formed on one surface of each of the first and second dielectric substrates, First above
And a plurality of inner conductors formed on the other surface of at least one of the second dielectric substrates and arranged substantially in parallel, an input / output coupling means having the inner conductors, and an inner conductor of the input / output coupling means. An input / output terminal formed by extension is provided, and the first and second outer conductors are exposed and the inner conductor is sandwiched between the first dielectric substrate and the second dielectric substrate. In the strip line filter formed by overlapping as described above, connection conductors for connecting the first outer conductor and the second outer conductor are provided in the vicinity of the input / output terminals on the side surfaces of the first and second dielectric substrates. A stripline filter characterized in that