JP2012204918A - Coaxial dual mode resonator, and filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial dual mode resonator having a smaller size, a lower profile, and a low loss in comparison with a conventional semi-coaxial resonator.SOLUTION: In this coaxial dual mode resonator having an external conductor and a tabular internal conductor disposed in the inside of the external conductor, the planar shape of the internal conductor is a quadrangular shape having a pair of sides in the X-axis direction and a pair of sides in the Y-axis direction perpendicular to the X-axis direction, and the internal conductor has a first resonance mode resonating in the X-axis direction and a second resonance mode resonating in the Y-axis direction. The resonator has a support post (an insulating post or a metal post) for fixing the center portion of the quadrangular internal conductor to the external conductor, and one of the four corners of the quadrangular internal conductor is chamfered. The resonator also has an input terminal provided on an optional one face of the external conductor to combine with the first resonance mode of the internal conductor and an output terminal provided on the other face of the external conductor than the face on which the input terminal is provided to combine with the second resonance mode of the internal conductor.

Description

  The present invention relates to a coaxial dual mode resonator and a filter, and more particularly, a coaxial dual mode resonator in which two resonance modes are degenerated in one physical space (in the resonator), and the coaxial dual mode. The present invention relates to a filter using a resonator.

Many filters using so-called single mode resonators having one resonance mode with one resonator are used in wireless communication devices and the like. Examples of the single mode resonator include a semi-coaxial resonator using metal. This resonator is configured by electrically contacting and fixing one end of a cylindrical metal in a metal case electrically shielded from the outside to the metal case by screws or brazing.
A single mode resonator is disposed in a cutoff waveguide when a filter is formed, and a desired filter characteristic is realized by being magnetically coupled or electric field coupled to an adjacent resonator. However, since one resonator has only one resonance mode, the number of resonators required to increase the number of stages of the filter when a plurality of modes are required increases, and the size of the filter itself increases. is there.
On the other hand, so-called multi-mode resonators having a plurality of resonance modes with one resonator have been proposed and used. In a multimode filter using a multimode resonator, the number of resonators required for the entire filter is reduced by using two or more resonance modes in one resonator. A multimode resonator is described in, for example, Patent Document 1 below.

Japanese Patent No. 3699090

Conventional semi-coaxial resonators use a cylindrical inner conductor, but useless space is generated inside the cylinder. Therefore, it has been difficult to reduce the size and the posture of the conventional semi-coaxial resonator. On the other hand, a multimode filter using a multimode resonator reduces the number of resonators required for the entire filter by using two or more resonance modes in one resonator. Even with a mode filter, it has been difficult to achieve a low profile.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to achieve a coaxial dual mode that is smaller, lower in posture, and lower in loss than a conventional semi-coaxial resonator. An object of the present invention is to provide a resonator and a filter using the coaxial dual mode resonator.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
(1) It has an outer conductor and a flat inner conductor disposed inside the outer conductor, and the planar shape of the inner conductor is orthogonal to the pair of sides in the X-axis direction and the X-axis direction. A rectangular shape having a pair of sides in the Y-axis direction, and the inner conductor is a coaxial having a first resonance mode that resonates in the X-axis direction and a second resonance mode that resonates in the Y-axis direction. It is a dual mode resonator, and has a column (insulating column or metal column) that fixes the central part of the rectangular inner conductor to the outer conductor, One of the four corners is chamfered, provided on any one surface of the outer conductor, and coupled to the first resonance mode of the inner conductor, and the input terminal of the outer conductor The inner conductor is provided on a surface other than the surface provided with And an output terminal coupled to the second resonant mode.
(2) In (1), there is a double mode coupling amount adjusting screw provided on the outer conductor, the double mode coupling amount adjusting screw facing a chamfered portion of the inner conductor, The double mode coupling amount is adjusted by the amount of insertion of the dual mode coupling amount adjusting screw.
(3) In (1), a first resonance frequency adjusting screw and a second resonance frequency adjusting screw provided on the outer conductor, wherein the first resonance frequency adjusting screw is the Y axis of the inner conductor. The second resonance frequency adjustment screw faces one side of the two sides in the X-axis direction of the inner conductor, and faces the first resonance frequency adjustment side. The resonance frequency of the coaxial dual mode resonator is adjusted by the amount of insertion of the screw and the second resonance frequency adjusting screw.

(4) When n is an integer greater than or equal to 2 and j is an integer greater than or equal to 2 and less than or equal to n, the outer conductor and the interior of the outer conductor are divided into n inner spaces (n-1) partition walls And n coaxial double mode resonators arranged in the n internal spaces, each coaxial double mode resonator having a flat plate-like internal conductor arranged in each internal space. And the planar shape of the inner conductor of each of the coaxial dual mode resonators is a quadrangular shape having a pair of sides in the X-axis direction and a pair of sides in the Y-axis direction orthogonal to the X-axis direction, The inner conductor of each of the coaxial dual mode resonators is a filter having a first resonance mode that resonates in the X-axis direction and a second resonance mode that resonates in the Y-axis direction. The center portion of the rectangular inner conductor of the coaxial dual mode resonator is fixed to the outer conductor A column (insulating column or metal column) and a column (insulating column or metal column) that fixes the central portion of the rectangular inner conductor of the j-th coaxial dual mode resonator to the partition. Each of the four corners of the rectangular inner conductor of each of the coaxial dual-mode resonators is chamfered and provided on the outer conductor. An input terminal coupled to the first resonance mode of the inner conductor of the coaxial dual-mode resonator, and a first resonance mode of the inner conductor of the n-th coaxial dual-mode resonator provided on the outer conductor Or an output terminal coupled to the second resonance mode.

(5) In (4), each of the coaxial dual mode resonators has a dual mode coupling amount adjusting screw provided on the outer conductor, and each of the dual mode coupling amount adjusting screws is a The dual mode coupling of each coaxial dual mode resonator is opposed to the chamfered portion of the inner conductor of the coaxial dual mode resonator and the amount of insertion of each of the dual mode coupling amount adjusting screws is inserted. Adjust the amount.
(6) In (4), each of the coaxial dual mode resonators has a first resonance frequency adjusting screw and a second resonance frequency adjusting screw provided on the outer conductor, and each of the coaxial dual mode resonances. The first resonance frequency adjusting screw of the resonator opposes one of the two sides in the Y-axis direction of the inner conductor, and the second resonance frequency adjusting screw of each coaxial dual mode resonator is Amount of insertion of the first resonance frequency adjusting screw and the second resonance frequency adjusting screw of each of the coaxial dual mode resonators facing one side of the two sides in the X-axis direction of the inner conductor To adjust the resonance frequency of each of the coaxial dual-mode resonators.
(7) In (4), each of the partition walls has a coupling hole.
(8) In (7), there is a coupling amount adjusting screw provided in the outer conductor and inserted into each coupling hole of each partition wall. The amount of coupling between the coaxial dual mode resonators is adjusted.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
According to the present invention, it is possible to provide a coaxial dual-mode resonator that is smaller, lower in profile, and lower in loss than a conventional semi-coaxial resonator, and a filter that uses the coaxial dual-mode resonator. It becomes.

It is a model perspective view which shows the outline | summary of the coaxial double mode resonator of Example 1 of this invention. It is a figure for demonstrating the internal structure of the coaxial double mode resonator of Example 1 of this invention. It is a figure for demonstrating the resonance mode of the coaxial double mode resonator of Example 1 of this invention. It is a figure for demonstrating the magnetic field component and electric field component of the coaxial dual mode resonator of Example 1 of this invention. It is a circuit diagram which shows the equivalent circuit of the coaxial double mode resonator of Example 1 of this invention. It is a model perspective view which shows the outline | summary of the band pass filter using the coaxial double mode resonator of Example 2 of this invention. It is a figure for demonstrating the internal structure of the band pass filter using the coaxial double mode resonator of Example 2 of this invention. It is a figure for demonstrating the internal structure of the band pass filter using the coaxial double mode resonator of Example 2 of this invention. It is a figure for demonstrating the internal structure of the band pass filter using the coaxial double mode resonator of Example 2 of this invention. It is a figure for demonstrating the internal structure of the band pass filter using the coaxial double mode resonator of Example 2 of this invention. It is a circuit diagram which shows the equivalent circuit of the bandpass filter using the coaxial double mode resonator of Example 2 of this invention. It is a graph which shows an example of the pass characteristic of the bandpass filter using the coaxial double mode resonator of Example 2 of this invention. It is a graph which shows an example of the return loss amount of the bandpass filter using the coaxial double mode resonator of Example 2 of this invention. It is a figure which shows the other example of the partition of the bandpass filter using the coaxial double mode resonator of Example 2 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted. Also, the following examples are not intended to limit the interpretation of the scope of the claims of the present invention.
[Example 1]
FIG. 1 is a schematic perspective view showing an outline of a coaxial dual mode resonator according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining the internal structure of the coaxial dual mode resonator according to the embodiment of the present invention. FIG. 2A is a diagram illustrating the outer conductor of the coaxial dual mode resonator shown in FIG. The figure which peeled and saw the ceiling part and the figure (b) are the figures which peeled and looked at the side part of the external conductor in the coaxial dual mode resonator shown in FIG.
1 and 2, 1 is a rectangular parallelepiped outer conductor, and 2 is a flat inner conductor. The internal conductor 2 has a square shape in plan view, and the internal conductor 2 is fixed to the metal support 3 with screws or the like. The metal support 3 is fixed to the outer conductor 1 with screws or the like.
Here, the outer conductor 1 is made of, for example, silver plated aluminum or copper plated aluminum. The inner conductor is composed of, for example, a super invar or an invar plated with silver. Furthermore, the metal support | pillar 3 is comprised with the aluminum plated with silver, or the aluminum plated with copper.
In addition, the above-mentioned metal material which comprises the outer conductor 1 or the inner conductor 2 is an example, Comprising: It is not necessarily limited to this metal material, For example, iron etc. can be used.
1 shows a case where the cross-sectional shape of the metal column 3 is circular, the cross-sectional shape of the metal column 3 is not limited to a circle, but a triangle, a quadrangle, or many It may be square.
1 and 2, 4 is an input / output terminal, 41 is an input / output coupling probe, 5 is a resonance frequency adjusting screw, 6 is a dual mode coupling adjusting screw, and 7 is a chamfered portion.

FIG. 3 is a diagram for explaining a resonance mode of the coaxial dual mode resonator according to the embodiment of the present invention. In the coaxial dual mode resonator of this embodiment, as shown by arrows A and B in FIG. 3, there are two TEM mode resonance modes that resonate in two directions, the X axis and the Y axis in FIG. Exists.
In the coaxial dual mode resonator of the present embodiment, a chamfered portion 7 is applied to one of the four corner portions of the inner conductor 2, and the two resonances are coupled at this portion. Here, the angle of the chamfered portion 7 is 45 °.
FIG. 4 is a diagram for explaining a magnetic field component and an electric field component when the resonance direction is the arrow A in FIG. 3 in the coaxial dual mode resonator according to the embodiment of the present invention. In FIG. 4, A indicates an electric field component and B indicates a magnetic field component.
4A shows a magnetic field component (B in FIG. 4) and an electric field component (A in FIG. 4) in the yz section of FIG. 3, and FIG. 4B shows a magnetic field in the xz section of FIG. A component (B in FIG. 4) and an electric field component (A in FIG. 4) are shown.
In this embodiment, when λo is a free space wavelength of the center frequency (fo) used in each resonance mode, the electrical length of one side of the inner conductor 2 in the direction of each resonance mode is λo / 2. It is said.

In the coaxial dual mode resonator of this embodiment, as shown in FIG. 2, two resonance frequency adjusting screws 5 (that is, a first resonance frequency adjusting screw and a second resonance frequency adjusting) formed on the outer conductor 1 are used. The resonance frequency of each of the two resonance modes can be adjusted by adjusting the insertion amount (in other words, the distance between the internal conductor 3 and the resonance frequency adjusting screw 5).
Similarly, the insertion amount of the double mode coupling adjustment screw 6 formed on the outer conductor 1 facing the chamfered portion 7 (in other words, the chamfered portion 7 of the inner conductor 3 and the dual mode coupling adjustment screw 6). By adjusting the distance between the two resonance modes, the coupling amount of the two resonance modes can be adjusted.
FIG. 5 shows an equivalent circuit of the coaxial dual mode resonator according to the embodiment of the present invention. In FIG. 5, M1 and M2 respectively indicate the resonance circuits of the dual mode resonator, and C01 is an input / output coupling probe connected to the input / output terminal 4 and one resonator of the coaxial dual mode resonator. C12 is a coupling circuit between one resonator of the coaxial dual-mode resonator and the other resonator of the coaxial dual-mode resonator, and C23 is the other of the coaxial dual-mode resonator. A coupling circuit between the resonator and the input / output coupling probe connected to the input / output terminal 4 is shown.

The feature of the coaxial dual mode resonator according to the present embodiment is that the inner conductor 2 is fixed to the outer conductor 1 by the metal pillar 3, and thereby the heat generated in the inner conductor 2 is transferred to the metal pillar 3 and the outer conductor. It is the point which was made to discharge | release outside efficiently through 1.
In the coaxial dual mode resonator of the present embodiment, the electrical length of one side of the inner conductor 2 in the direction of each resonance mode is λo / 2. Therefore, the voltage at the center point of the inner conductor 2 is 0 (ground potential). Therefore, even if the central portion of the inner conductor 2 is fixed to the outer conductor 1 by the metal support 3, the dual mode resonance is not significantly affected. However, if the diameter of the metal column 3 is increased, the double mode resonance is affected. Therefore, the diameter of the metal column 3 needs to be appropriately set to an optimal value according to the design specifications of the coaxial dual mode resonator. There is.
Here, as shown in FIG. 2A, when the thickness (d) of the inner conductor 2 is used, the unloaded Q (Qu) of the coaxial dual mode resonator depends on the thickness (d) of the inner conductor 2. Change. Therefore, the thickness (d) of the inner conductor 2 needs to be appropriately set to an optimal value according to the no-load Q (Qu) required for the coaxial dual mode resonator.

As described above, according to the coaxial dual mode resonator of the present embodiment, it is possible to achieve a lower posture and a smaller size than the conventional semi-coaxial resonator. That is, a conventional semi-coaxial resonator generally uses a cylindrical inner conductor, but a wasteful space is generated inside the cylinder. On the other hand, in the coaxial dual mode resonator of the present embodiment, by using the flat inner conductor 2, it is possible to minimize a useless space. Therefore, compared to the conventional semi-coaxial resonator, It is possible to reduce the posture and size, and to reduce the cost because the structure is simple. Furthermore, in the present embodiment, the size of the inner conductor 2 in the vertical and horizontal directions can be matched to each resonance frequency, so that double degeneration can be achieved and the size can be reduced.
Further, in the multimode resonator described in the above-mentioned Patent Document 1, since the inner conductor block is used, it is difficult to reduce the posture, but the coaxial dual mode resonator of the present embodiment. According to the above, since the useless space can be minimized by using the flat inner conductor 2, it is possible to achieve a lower posture than the multimode resonator described in Patent Document 1. It becomes.
Further, in the multimode resonator described in Patent Document 1, the inner conductor block needs to be installed in a non-contact state with the outer conductor and is supported by a dielectric or the like. It is difficult to dissipate the heat generated at the outside.
On the other hand, in the coaxial dual mode resonator of the present embodiment, the inner conductor 2 is fixed to the outer conductor 1 by the metal support 3, so that the heat generated in the inner conductor 2 is It is possible to efficiently discharge to the outside through the conductor 1.
If the diameter of the metal column 3 is increased, the heat dissipation effect is increased, but the unloaded Q (Qu) of the resonator is decreased, and if the diameter of the metal column 3 is decreased, the heat dissipation effect is decreased. The unloaded Q (Qu) of the resonator increases. Therefore, the diameter of the metal column 3 needs to be set to an optimal value as appropriate according to the no-load Q (Qu) required for the coaxial dual mode resonator.

[Example 2]
FIG. 6 is a schematic perspective view showing an outline of a band-pass filter using the coaxial dual mode resonator according to the second embodiment of the present invention.
FIG. 7 is a diagram for explaining the internal structure of the band-pass filter using the coaxial dual mode resonator according to the embodiment of the present invention. In the filter shown in FIG. 6, the side surface portion of the outer conductor is peeled off. It is a figure.
6 and 7, 1 is an outer conductor, 21, 22 and 23 are inner conductors, 3 is a metal column, 4 is an input / output terminal, 6 is a dual mode coupling adjustment screw, 8 is a coupling amount adjustment screw, 91 , 92 are partition walls.
The filter of the second embodiment is characterized in that three stages of the coaxial dual mode resonators of the above-described embodiments are stacked.
The internal conductors (21, 22, 23) have a square shape in plan view, and the internal conductors (21, 22, 23) are fixed to the metal support column 3 with screws or the like.
The first-stage inner conductor 21 is fixed to the outer conductor 1 by a metal support 3 fixed to the outer conductor 1 with a screw or the like. The second-stage inner conductor 22 is fixed to the partition wall 91 by a metal support 3 fixed to the partition wall 91 with screws or the like, and the third-stage inner conductor 23 is fixed to the partition wall 92 by screws or the like. Thus, it is fixed to the partition wall 92.
In the bandpass filter of the present embodiment, the electrical length of one side of each coaxial dual mode resonator inner conductor 2 in the direction of each resonance mode is λo / 2. Further, the outer conductor 1 and the inner conductors (21, 22, 23) are made of the same metal material as in the first embodiment. Also in this embodiment, the metal support 3 is a metal support having a circular, triangular, quadrangular, or polygonal cross-sectional shape.

FIG. 8 is a diagram for explaining the internal structure of the band-pass filter using the coaxial dual mode resonator according to the embodiment of the present invention, and illustrates the internal structure of the first-stage coaxial double mode resonator. FIG. The internal structure of the first-stage coaxial dual mode resonator is the same as the internal structure of the coaxial dual mode resonator of the above-described embodiment.
FIG. 9 is a diagram for explaining the internal structure of the bandpass filter using the coaxial dual mode resonator according to the embodiment of the present invention. FIG. 9A shows the coaxial double mode resonance at the second stage. FIG. 6B is a view for explaining the partition wall 91. FIG.
As described above, the second-stage inner conductor 22 is fixed to the partition wall 91 by the metal support column 3, but the partition wall 91 has a first-stage coaxial dual mode resonance as shown in FIG. 9B. A coupling hole 10 is formed for coupling any resonance mode of the resonator to any resonance mode of the second-stage coaxial dual mode resonator.
In addition, a coupling amount adjusting screw 8 is formed in the outer conductor 1, and an insertion amount of the coupling amount adjusting screw 8 inserted into the coupling hole 10 (formed in the coupling amount adjusting screw 8 and the partition wall 91 is formed. The distance between the bottom of the coupled coupling hole 10) and any one of the resonance modes of the first-stage coaxial dual-mode resonator and any of the second-stage coaxial dual-mode resonators. It is possible to adjust the amount of coupling between the resonance mode and the resonance mode.

FIG. 10 is a diagram for explaining the internal structure of the bandpass filter using the coaxial dual mode resonator according to the embodiment of the present invention. FIG. 10A shows the third stage coaxial double mode resonance. FIG. 6B is a view for explaining the partition wall 92. FIG.
As described above, the third-stage inner conductor 23 is fixed to the partition wall 92 by the metal support 3, but the partition 92 has a second-stage coaxial dual mode resonance as shown in FIG. A coupling hole 10 is formed for coupling any resonance mode of the resonator to any resonance mode of the third-stage coaxial dual mode resonator.
In addition, a coupling amount adjusting screw 8 is formed in the outer conductor 1, and an insertion amount of the coupling amount adjusting screw 8 inserted into the coupling hole 10 (formed in the coupling amount adjusting screw 8 and the partition wall 92 is formed. Between the resonance mode of the second-stage coaxial dual-mode resonator and the third-stage coaxial dual-mode resonator It is possible to adjust the amount of coupling between the resonance mode and the resonance mode.
The coupling hole 10 formed in the partition wall (91, 92) is not formed in the periphery of the partition wall (91, 92) but between the center of the partition wall (91, 92) as shown in FIG. You may make it do.

Further, in the filter of this embodiment, as shown in FIGS. 8 to 10, two resonance frequency adjusting screws 5 (that is, the first resonance frequency adjusting screw and the second resonance frequency adjusting) formed on the outer conductor 1. The resonance frequency of each of the two resonance modes can be adjusted by adjusting the insertion amount (in other words, the distance between the internal conductor 3 and the resonance frequency adjusting screw 5).
Similarly, the insertion amount of the double mode coupling adjusting screw 6 formed on the outer conductor 1 facing the chamfered portion 7 (in other words, doubled with the chamfered portion 7 of the inner conductor (21, 22, 23)). The amount of coupling between the two resonance modes can be adjusted by adjusting the distance between the mode coupling adjusting screw 6 and the mode coupling adjusting screw 6.
FIG. 11 shows an equivalent circuit of a band pass filter using the coaxial dual mode resonator of the embodiment of the present invention.
In FIG. 11, M11 and M12 are the resonance circuits of the first-stage dual-mode resonator, M21 and M22 are the resonance circuits of the second-stage dual-mode resonator, and M31 and M32 are 3 respectively. Resonant circuits of the double-mode resonators in the stage are shown.
C01 is a coupling circuit between the input / output coupling probe connected to the input / output terminal 4 and one of the first-stage coaxial dual-mode resonators, and C12 is the first-stage coaxial duplex. The coupling circuit of one resonator of a mode resonator and the other resonator of the coaxial double mode resonator of the 1st stage is shown.
C23 is a coupling circuit between the other resonator of the first-stage coaxial dual-mode resonator and one resonator of the second-stage coaxial dual-mode resonator, and C34 is a second-stage coaxial. The coupling circuit of one resonator of a dual mode resonator and the other resonator of the coaxial double mode resonator of the 2nd stage is shown.
Further, C45 is a coupling circuit between the other resonator of the second-stage coaxial dual-mode resonator and one resonator of the third-stage coaxial dual-mode resonator, and C56 is the third-stage coaxial. The coupling circuit of one resonator of the dual mode resonator and the other resonator of the third-stage coaxial dual-mode resonator is shown, and C67 represents the other circuit of the third-stage coaxial dual-mode resonator. A coupling circuit of a resonator and an input / output coupling probe connected to the input / output terminal 4 is shown.

FIG. 12A is a graph showing an example of a pass characteristic of a band-pass filter using the coaxial dual mode resonator of the second embodiment of the present invention, and FIG. 12B is a coaxial dual mode resonance of the second embodiment of the present invention. It is a graph which shows an example of the return loss amount of the bandpass filter using a filter.
12A and 12B, the horizontal axis represents frequency (MHz), the center frequency is 818 MHz, and the scale is 50 MHz. The vertical axis represents the attenuation (dB).
In the pass characteristic shown in FIG. 12A, the attenuation of the pass band of 814.2 MHz to 821.8 MHz is within about −0.7 dB. In the return loss characteristic shown in FIG. 12B, 814.2 MHz to 821. The return loss in the 8 MHz pass band is about −23 dB or more.
In the above description, the embodiment using the metal support 3 has been described. However, when the heat generated in the inner conductor 2 does not matter so much, the metal support 3 may be changed to a support made of an insulator. Good. In this case, the influence of the support on the double mode resonance is small.
In the above description, the embodiment using the input / output coupling probe 41 has been described. However, a coupled loop element may be used instead of the input / output coupling probe 41.
As described above, the filter according to the present embodiment uses the coaxial dual mode resonator according to the above-described embodiment, so that it is small in size and can be reduced in price. Furthermore, since the heat generated in the inner conductors (21, 22, 23) can be efficiently released to the outside through the metal support 3 and the outer conductor 1 (or the partition walls (91, 92)), this embodiment is implemented. The example filter can be applied to high power applications.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

DESCRIPTION OF SYMBOLS 1 Outer conductor 2,21,22,23 Inner conductor 3 Metal support | pillar 4 Input / output terminal 5 Resonance frequency adjustment screw 6 Dual mode coupling adjustment screw 7 Chamfered part 8 Coupling amount adjustment screw 10 Coupling hole 41 Input / output coupling probe 91, 92 Bulkhead

Claims (12)

An outer conductor,
A flat inner conductor disposed inside the outer conductor;
The planar shape of the inner conductor is a quadrangular shape having a pair of sides in the X-axis direction and a pair of sides in the Y-axis direction orthogonal to the X-axis direction,
The inner conductor is a coaxial dual mode resonator having a first resonance mode that resonates in the X-axis direction and a second resonance mode that resonates in the Y-axis direction,
Having a column that fixes the center of the rectangular inner conductor to the outer conductor;
One of the four corners of the rectangular inner conductor is chamfered,
An input terminal provided on any one surface of the outer conductor and coupled to the first resonance mode of the inner conductor;
A coaxial dual mode resonator having an output terminal provided on a surface other than the surface on which the input terminal of the outer conductor is provided and coupled to the second resonance mode of the inner conductor.   The coaxial dual mode resonator according to claim 1, wherein the support column is an insulating support column.   The coaxial dual mode resonator according to claim 1, wherein the support column is a metal support column. A double mode coupling amount adjusting screw provided on the outer conductor;
The dual mode coupling amount adjusting screw faces the chamfered portion of the inner conductor,
2. The coaxial dual mode resonator according to claim 1, wherein the double mode coupling amount is adjusted by an insertion amount of the dual mode coupling amount adjusting screw. A first resonance frequency adjusting screw and a second resonance frequency adjusting screw provided on the outer conductor;
The first resonance frequency adjusting screw is opposed to one side of the two sides of the inner conductor in the Y-axis direction,
The second resonance frequency adjusting screw is opposed to one side of the two sides in the X-axis direction of the inner conductor,
2. The coaxial double mode according to claim 1, wherein a resonance frequency of the coaxial dual mode resonator is adjusted by an insertion amount of each of the first resonance frequency adjustment screw and the second resonance frequency adjustment screw. Mode resonator. When n is an integer of 2 or more and j is an integer of 2 or more and n or less,
An outer conductor,
(N-1) partition walls that divide the inside of the outer conductor into n internal spaces;
N coaxial double mode resonators arranged in the n internal spaces,
Each of the coaxial double mode resonators has a flat plate-like inner conductor disposed in each of the inner spaces,
The planar shape of the inner conductor of each coaxial dual mode resonator is a quadrangular shape having a pair of sides in the X-axis direction and a pair of sides in the Y-axis direction orthogonal to the X-axis direction,
An inner conductor of each coaxial dual mode resonator is a filter having a first resonance mode that resonates in the X-axis direction and a second resonance mode that resonates in the Y-axis direction,
A column that fixes the central portion of the rectangular inner conductor of the first coaxial dual mode resonator to the outer conductor, and the center of the rectangular inner conductor of the jth coaxial dual mode resonator. And a column for fixing the part to the partition wall,
One of the four corners of the rectangular inner conductor of each of the coaxial dual mode resonators is chamfered,
An input terminal provided on the outer conductor and coupled to the first resonance mode of the inner conductor of the first coaxial dual mode resonator;
A filter provided on the outer conductor and having an output terminal coupled to the first resonance mode or the second resonance mode of the inner conductor of the nth coaxial dual mode resonator.   The filter according to claim 6, wherein the support column is an insulating support column.   The filter according to claim 6, wherein the support column is a metal support column. Each of the coaxial dual mode resonators has a double mode coupling amount adjusting screw provided on the outer conductor,
Each of the dual mode coupling amount adjusting screws is opposed to the chamfered portion of the inner conductor of each of the coaxial dual mode resonators,
The filter according to claim 6, wherein the amount of coupling of the dual mode of each of the coaxial dual mode resonators is adjusted by the amount of insertion of each of the dual mode coupling amount adjusting screws. Each of the coaxial dual mode resonators has a first resonance frequency adjusting screw and a second resonance frequency adjusting screw provided on the outer conductor,
The first resonance frequency adjusting screw of each coaxial dual mode resonator faces one side of the two sides of the inner conductor in the Y-axis direction,
The second resonance frequency adjusting screw of each coaxial dual mode resonator faces one side of the two sides in the X-axis direction of the inner conductor,
The resonance frequency of each of the coaxial dual mode resonators is adjusted by the amount of insertion of the first resonance frequency adjusting screw and the second resonance frequency adjusting screw of each of the coaxial dual mode resonators. The filter according to claim 6.   The filter according to claim 6, wherein each partition wall has a coupling hole. Provided on the outer conductor, having a coupling amount adjusting screw inserted into each coupling hole of each partition wall,
The filter according to claim 11, wherein a coupling amount between the coaxial dual-mode resonators is adjusted by an insertion amount of the coupling amount adjusting screw.

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