JPH1028003A - Waveguide branching filter and polarizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact branching filter having high frequency range branching characteristics and capable of suppressing the influence of a high order mode generated at a branching part by providing waveguide filters with plural connection holes vertically symmetrically to the center line bisected in a height direction of one of the wall surfaces of the main waveguide. SOLUTION: Two branching waveguide high frequency filters 6a and 6b are constituted by providing two connection surfaces vertically symmetrical to the center line bisected in the height direction of the two wall surfaces facing each other of a square main waveguide 1. By the constitution, the basic mode of a radio wave provided with a polarization plane in a direction parallel to a metal plate 7 in a lower (higher) frequency band in the total of four kinds of the radio waves made incident from the input end P1 of the square main waveguide 1 is connected to the basic mode of a rectangular branching waveguide 3a (3b) by a bisected connection hole 12a (12b) and propagation is performed in a first (second) waveguide high frequency filter 6a (6b). Thus, this small-sized branching filter provided with excellent branching characteristics over a wide band is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a small-sized waveguide type duplexer and a polarization splitter having a wide band and high isolation splitting characteristics used in a band, a UHF band, a microwave band and a millimeter wave band.

[0002]

2. Description of the Related Art As a first conventional example, FIG.
J.Uher, J.Bornemann, U.Rosenberg, ■ Waveguide Compo
nents for Antenna Feed Systems: Theory and CAD ■,
It is a perspective view which shows the conventional duplexer used in the orthogonal bi-polarization 2 frequency band shared antenna feed system shown by ARTECH HOUSE INC., Pp.403-418, 1993. In the figure, 1 is 2
Square main waveguides 2a and 2b for transmitting a total of four types of radio waves each consisting of two orthogonally polarized waves in two different frequency bands are provided, one on each of two parallel opposite walls of the square main waveguide 1. The coupling hole has an opening surface that is determined in accordance with the wavelength of the radio wave to be branched and is positioned. Reference numeral 3a denotes a rectangular branch waveguide branched in a direction perpendicular to the tube axis of the square main waveguide 1 through the coupling hole 2a, and 4a denotes a plurality of inductive irises provided in the rectangular branch waveguide 3a. 5a are these inducible irises 4
a and a plurality of cavity resonators separated by coupling holes 2a, 6a is a first waveguide type high frequency filter composed of a rectangular branch waveguide 3a, an inductive iris 4a and a cavity resonator 5a. is there. 3b is a rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the square main waveguide 1 via the coupling hole 2b, 4b is a plurality of inductive irises provided in the rectangular branch waveguide 3b, 5b are these inducible irises 4b
And a plurality of cavity resonators separated by coupling holes 2b, and 6b is a second waveguide type high frequency filter composed of a rectangular branch waveguide 3b, an inductive iris 4b and a cavity resonator 5b. . 7 is a coupling hole 2a in the square main waveguide 1,
A thin metal plate inserted in a direction parallel to the side wall of the square main waveguide provided with 2b, P1 is an input end of the square main waveguide 1, and P2 is an output end of the square main waveguide 1.

Next, the operation will be described. The fundamental mode of a radio wave having a plane of polarization parallel to the thin metal plate 7 in the lower frequency band of the total of four types of radio waves incident from the input terminal P1, that is, the TE10 mode corresponds to the wavelength of the radio wave. A rectangular branch waveguide 3 is formed by a coupling hole 2a having an opening surface of
The light is coupled to the fundamental mode a and propagates through the first waveguide type high frequency filter 6a. In the higher frequency band, the fundamental mode of a radio wave having a polarization parallel to the thin metal plate 7 is a coupling hole 2 having an aperture corresponding to the wavelength of the radio wave.
b couples to the fundamental mode of the rectangular branch waveguide 3b and
In the waveguide type high frequency filter 6b. Further, the fundamental mode of two kinds of radio waves having a polarization direction perpendicular to the metal thin plate 7, that is, the TE01 mode is the coupling hole 2
a2b and the output end P2 of the rectangular main waveguide 1 without being substantially reflected by the thin metal plate 7.
Get out of.

Since the first conventional duplexer is constructed as described above, for example, the coupling holes 2a and 2b facing each other are used.
When the area of the coupling hole 2a increases through a higher-order mode generated in a branch portion as represented by the TE20 mode,
2b are coupled to each other to cause undesirable effects, and cause deterioration of the reflection characteristic at the incident end P1 in each use frequency band. When the area of the coupling holes 2a and 2b is reduced, the occurrence of the TE20 mode is suppressed, and unnecessary coupling between the coupling holes 2a and 2b can be suppressed. As a result, the influence of the higher-order mode becomes extremely large, so that broadband demultiplexing characteristics cannot be expected.

[0005] As a second conventional example, FIG.
FIG. 9 is a perspective view showing a conventional polarization splitter used in a dual-polarization antenna feeding system. In the figure, 1 is a square main waveguide that transmits a total of two types of radio waves composed of two orthogonal polarized waves,
2a is a coupling hole provided on one wall surface of the square main waveguide 1, and 3a is a square branch waveguide branched in a direction perpendicular to the tube axis of the square main waveguide 1 via the coupling hole 2a. The tube 4a is a plurality of inductive irises provided in the rectangular branch waveguide 3a, and the numeral 5a is these inductive iris 4
a and a plurality of cavity resonators separated by a coupling hole 2a, 6a is a waveguide type high frequency filter composed of a rectangular branch waveguide 3a, an inductive iris 4a and a cavity resonator 5a, 7 is a square A thin metal plate inserted in the main waveguide 1 in a direction parallel to the side wall of the square main waveguide provided with the coupling hole 2a, P1 is an input end of the square main waveguide 1, and P2 is an output of the square main waveguide 1. Is the end.

Next, the operation will be described. Among the two types of radio waves incident from the input end P1 of the square main waveguide 1, the fundamental mode, ie, TE10 mode, of the radio wave having a plane of polarization parallel to the metal thin plate 7 is a square branch waveguide by the coupling hole 2a. The light is coupled to the fundamental mode of the tube 3a and propagates through the waveguide type high frequency filter 6a. In addition, the fundamental mode of a radio wave having a polarization plane in a direction perpendicular to the metal thin plate 7, that is, TE
The 01 mode exits from the output end P2 of the square main waveguide 1 without being coupled to the coupling hole 2a and with little reflection from the thin metal plate 7. Here, the coupling hole 2
The size and position of “a” are appropriately determined according to the frequency band of the radio wave to be separated from the rectangular main waveguide 1 into the rectangular branch waveguide 3a.

[0007] Since the second conventional example of the demultiplexer is constructed as described above, for example, when the area of the coupling hole 2a is increased, the higher order demultiplexer generated in the branching section typified by the TE20 mode is required. A large mode is generated, and the reflection characteristic at the incident end P1 in the used frequency band is deteriorated. Also,
When the area of the coupling hole 2a is reduced, the generation of the TE20 mode is suppressed, and the reflection characteristics at the incident end 5 can be improved.
The influence of a higher-order mode typified by a mode becomes very large, and broadband demultiplexing characteristics cannot be expected.

As a third conventional example, FIG. 19 is a perspective view showing a conventional polarization splitter used in a feed system for a dual orthogonally polarized dual antenna. In the figure, 1 is orthogonal to 2
Square main waveguides 2a and 2c for transmitting a total of two types of radio waves composed of two polarized waves are coupling holes provided one on each of two adjacent wall surfaces of the square main waveguide 1. 3
a is a rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the square main waveguide 1 through the coupling hole 2a, and 4a is a plurality of inductive irises provided in the rectangular branch waveguide 3a. , 5a are these inductive iris 4a and binding hole 2
A plurality of cavity resonators separated by a, 6a is a first waveguide type high frequency filter composed of a rectangular branch waveguide 3a, an inductive iris 4a and a cavity resonator 5a. 3
c is a rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the square main waveguide 1 through the coupling hole 2c, 4c is a plurality of inductive irises provided in the rectangular branch waveguide 3c,
5c is a plurality of cavity resonators separated by the inductive iris 4c and the coupling hole 2c, and 6c is a second resonator composed of the rectangular branch waveguide 3c, the inductive iris 4c and the cavity resonator 5c. This is a waveguide type high frequency filter. Reference numeral 8 denotes a conductor short-circuit plate for short-circuiting one end of the square main waveguide 1, and P1 denotes an input end of the square main waveguide 1.

Next, the operation will be described. The fundamental mode, that is, the TE10 mode, of the radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3a among the total of two types of radio waves incident from the input end P1 of the square main waveguide 1 is The hole 2a couples to the fundamental mode of the rectangular branch waveguide 3a and propagates through the first waveguide high-frequency filter 6a.
The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3c, that is, the TE01 mode, is coupled to the fundamental mode of the rectangular branch waveguide 3c by the coupling hole 2c, and the second conduction mode is obtained. The light propagates through the wave tube type high frequency filter 6c. Here, the size and position of the coupling holes 2a, 2c are
It is appropriately determined according to the frequency band of each radio wave to be separated from the rectangular main waveguide 1 into the rectangular branch waveguides 3a and 3c.

Since the duplexer according to the third conventional example is configured as described above, for example, if the area of the adjacent coupling holes 2a and 2c is increased, it is generated at a branch portion typified by the TE20 mode. Coupled to each other through higher order modes
This causes undesired effects and causes degradation of isolation characteristics between polarizations. When the area of the coupling holes 2a and 2c is reduced to some extent, the occurrence of the TE20 mode is suppressed, and unnecessary coupling between the coupling holes 2a and 2c can be suppressed to some extent. In this case, the influence of the higher-order mode represented by the equation (1) becomes large, and broadband demultiplexing characteristics cannot be expected.

As a fourth conventional example, FIG. 20 shows, for example, J. Uher, J. Bornemann, U. Rosenberg, and Waveguide C.
omponents for Antenna Feed Systems: Theory and CA
FIG. 9 is a perspective view showing a conventional polarization splitter used in a feed system for a dual-antenna dual-polarization dual-frequency band shared antenna shown in D ■, ARTECH HOUSE INC., Pp. 403-418, 1993. In the figure, 1
Is a square main waveguide for transmitting a total of four types of radio waves composed of two orthogonally polarized waves in two different frequency bands, 2e
Is a coupling hole provided one by one in the same shape at a symmetrical position of two facing wall surfaces of the square main waveguide 1, and 2f is a facing surface other than the wall surface provided with the coupling hole 2e of the square main waveguide 1. The coupling holes are provided one by one in the same shape at symmetric positions of two wall surfaces. Reference numeral 3e denotes a rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the square main waveguide 1 through the coupling hole 2e, and 4e denotes a plurality of inductive irises provided in the rectangular branch waveguide 3e. Reference numeral 5e denotes a plurality of cavity resonators separated by the inductive iris 4e and the coupling hole 2e, and 6e denotes a rectangular branch waveguide 3e, an inductive iris 4e, and a cavity resonator 5e.
Two waveguide-type high-frequency filters. 3f is a bonding hole 2f
, A rectangular branch waveguide 4f that branches in a direction perpendicular to the tube axis of the square main waveguide 1 and 4f is a rectangular branch waveguide 3f.
A plurality of inductive irises 5f, a plurality of cavity resonators partitioned by the inductive iris 4f and the coupling hole 2f, and a square branch waveguide 3f, the inductive iris 4f and the cavity This is two waveguide type high frequency filters composed of the resonator 5f. P1 is a square main waveguide 1
, P2 is an output end of the rectangular main waveguide 1, and 9 is a two-stage square waveguide step connected to the output end P2.

Next, the operation will be described. Basics of radio waves having a polarization plane perpendicular to the tube axis of the rectangular branch waveguide 3e in the lower frequency band among the total of four types of radio waves incident from the input end 5 of the rectangular main waveguide 1 Mode, ie TE1
The 0 mode is equally coupled to the fundamental modes of the two rectangular branch waveguides 3e opposed by the coupling hole 2e, and propagates through the waveguide type high frequency filter 6e. The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3f in the lower frequency band, that is, the TE01 mode, is the same as that of the two rectangular branch waveguides 3f opposed by the coupling hole 2f. Coupling equally to the fundamental mode, waveguide type high frequency filter 6f
Propagating inside. Further, the two types of radio waves in the higher frequency band do not couple with the coupling holes 2e and 2f,
The light exits at the two-stage square waveguide step 9 with almost no reflection. Here, the coupling holes 2e and 2f
Is determined as appropriate according to the frequency band of the radio wave to be separated from the rectangular main waveguide 1 into the rectangular branch waveguides 3e and 3f.

[0013] Since the fourth conventional example of the demultiplexer is constructed as described above, even if the area of the coupling holes 2e and 2f is increased to some extent, due to the vertical and horizontal symmetry of the structure,
Since the generation of higher-order modes that greatly contribute to unnecessary coupling between the coupling holes as represented by the TE20 mode is completely suppressed, very good reflection characteristics and isolation characteristics as a polarization splitter can be obtained over a wide band. Can be However, in this polarization splitter, a combining circuit for combining radio waves of the same polarization separated into two opposing rectangular branch waveguides 3e, and a similar splitting circuit into two rectangular branch waveguides 3f. A synthesizing circuit for synthesizing radio waves is required, and the entire power supply circuit becomes very large. Therefore, it is difficult to reduce the size of the circuit.

As a fifth conventional example, FIG. 21 is a perspective view showing a conventional polarization splitter used in an orthogonal dual-polarization dual-purpose antenna feed system disclosed in, for example, Japanese Patent Application Laid-Open No. 7-22803. In the figure, reference numeral 10 denotes a circular main waveguide for transmitting a total of two types of radio waves composed of two orthogonal polarized waves, and 11 denotes a short-circuit conductor plate provided at one end of the circular main waveguide 2.
And 2h are about 1/1 of the wavelength in the circular main waveguide in the frequency band used from the short-circuit conductor plate 11 on the wall surface of the circular main waveguide 8.
Four coupling holes are provided at a position four away from each other and at a position approximately three-quarters or three-quarters or more apart from each other so that their hole surfaces are orthogonal to each other. 3g is a rectangular branch waveguide branched in a direction perpendicular to the tube axis of the circular main waveguide 1 through the coupling hole 2g, and 4g is a plurality of inductive irises provided in the rectangular branch waveguide 3g. 5g, a plurality of cavity resonators separated by the inductive iris 4g and the coupling hole 2g, and 6g, two cavity resonators composed of the rectangular branch waveguide 3g, the inductive iris 4g, and the cavity resonator 5g. This is a waveguide type high frequency filter. 3h is a rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the circular main waveguide 10 through the coupling hole 2h, 4h is a plurality of inductive irises provided in the rectangular branch waveguide 3h, 5h is a plurality of cavity resonators separated by the inductive iris 4h and the coupling hole 2h, and 6h is a rectangular branch waveguide 3h and the inductive iris 4h.
Two waveguide-type high-frequency filters, each composed of a cavity resonator 5h, and P1 are input terminals of the circular main waveguide 1.

Next, the operation will be described. The fundamental mode of the radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3g of the two types of radio waves incident from the input end P1 of the circular main waveguide 10 is the coupling hole 2g.
With this, it is coupled to the fundamental mode of the rectangular branch waveguide 3g and propagates through the waveguide type high frequency filter 6g. The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3h is coupled to the fundamental mode of the rectangular branch waveguide 3h by the coupling hole 2h and passes through the waveguide type high frequency filter 6h. Propagate.

Since the fifth conventional polarization splitter is constructed as described above, for example, the distance between the coupling hole 2g and the coupling hole 2h is set to about 1 of the wavelength in the frequency band used by the circular main waveguide 10.
/ 2, the gap between the coupling hole 2g and the coupling hole 2h is not sufficient, so that the coupling hole 2g generated through the higher-order mode.
Unnecessary coupling between the coupling hole 2h and the coupling hole 2h has a great effect on the demultiplexing characteristics of the demultiplexer, and causes degradation of the isolation characteristics. Further, when the interval between the coupling hole 2g and the coupling hole 2h is separated by １ ／ or more of the operating frequency band guide wavelength in order to obtain high isolation characteristics, the length of the polarization splitter in the tube axis direction is determined by the operating frequency. The wavelength becomes about ／ or more of the in-band wavelength, and further reduction of the structure cannot be expected.

[0017]

The conventional waveguide-type duplexer and dual-polarization duplexer or dual-polarization duplexer configured as described above are constructed as described above. Due to the influence of the generated higher-order mode, its reflection characteristics or isolation characteristics are degraded, and therefore, there has been a problem that good demultiplexing characteristics over a wide band cannot be obtained. Another problem is that miniaturization is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is a small-sized and wide band in which the influence of a high-order mode generated in a branching portion of a duplexer and a polarization splitter is suppressed. It is an object of the present invention to obtain a duplexer having a demultiplexing characteristic and a polarization splitter.

[0019]

SUMMARY OF THE INVENTION A waveguide type duplexer according to the present invention uses a waveguide type filter having coupling holes provided on two wall surfaces facing a center axis of a main waveguide. In the waveguide type duplexer, each waveguide type filter is
Two coupling holes were provided symmetrically in the vertical direction on the center line divided into two in the height direction of one wall surface of the main waveguide.

Still further, the waveguide type filter is provided so as to face the central axis of the main waveguide.

According to the present invention, there is provided a waveguide type polarization splitter using a waveguide type filter having a coupling hole provided on a wall surface of a main waveguide. The tubular filter was installed as two coupling holes vertically symmetrically with respect to a center line divided into two in the height direction of the wall surface of the main waveguide.

Further, a short-circuit plate is provided at one end of the main waveguide, two waveguide filters are provided, and the filters are installed near the short-circuit plate at right angles to the center axis of the main waveguide. And
In each of the waveguide filters, two coupling holes are provided symmetrically in the vertical direction on the center line divided into two in the height direction of the wall surface of the main waveguide.

Further, a short-circuit plate is provided at one end of the main waveguide, and four waveguide filters are provided, and each of the filters is provided near the short-circuit plate in a direction perpendicular to the central axis of the main waveguide. Each of the waveguide filters was installed, and two coupling holes were provided vertically symmetrically with respect to a center line divided into two in the height direction of the wall surface of the main waveguide.

Still further, the coupling hole in the main waveguide is such that n is 2
The above positive integer was set to 2n.

In the waveguide type polarization splitter according to the present invention, a short-circuit plate is provided at one end of the main waveguide, and a plurality of waveguide type filters having coupling holes provided in the wall surface of the main waveguide are provided. In the used waveguide type polarizer / demultiplexer, the above-mentioned waveguide type filter has 2
Are placed perpendicular to each other with respect to the central axis of the main waveguide, and at the center of one of the upper and lower quarters parallel to the central axis, which is approximately equally divided in the height direction of the wall surface of the main waveguide. A coupling hole was provided.

Still further, the waveguide type filter of the main waveguide has two signals which are perpendicular to each other with respect to the center axis of the main waveguide and whose one of the distances from the short-circuit plate provided on the main waveguide is branched. Each of the waveguide filters is disposed at a distance within 1/4 wavelength of the wavelength and about 3/4 wavelength apart from the same wavelength, and each of the waveguide filters extends in a direction away from the main waveguide. It has a step height of steps.

Further, the main waveguide is square.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. A waveguide type duplexer according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the configuration of the waveguide type duplexer of the present embodiment. FIG. 2 to FIG. 4 are electromagnetic field mode explanatory diagrams for explaining the electromagnetic field modes in the duplexer having the configuration of FIG. In FIG. 1, 1 is 2 orthogonal to each other in two different frequency bands.
It is a square main waveguide that transmits a total of four types of radio waves consisting of two polarized waves. 12a and 12b are provided on two parallel opposite walls of the square main waveguide 1, and
The coupling hole is divided into two parts in a direction perpendicular to the tube axis of the square main waveguide 1. In this configuration, 12a, 12b
Are vertically symmetric with respect to a center line A (vertical symmetry plane) divided into two in the height direction of each wall surface, and are provided so that the center is located at a position where the wall surface is divided into about 1/4. 3a is the coupling hole 12
a, a plurality of inductive irises provided in the rectangular branch waveguide 3a, and a plurality of inductive irises 5a provided in the rectangular branch waveguide 3a are branched in a direction perpendicular to the tube axis of the square main waveguide 1 through a. A plurality of cavity resonators 6a separated by the inductive iris 4a and the coupling hole 12a, a first waveguide 6a comprising a rectangular branch waveguide 3a, an inductive iris 4a and a cavity resonator 5a. It is a tubular high-frequency filter.

Reference numeral 3b denotes another rectangular branch waveguide that branches in a direction perpendicular to the tube axis of the square main waveguide 1 via the coupling hole 12b, and 4b denotes a plurality of rectangular waveguides provided in the rectangular branch waveguide 3b. 5b, a plurality of cavity resonators separated by the inductive iris 4b and the coupling hole 12b, and 6b a rectangular branch waveguide 3b and the inductive iris 4b.
This is a second waveguide-type high-frequency filter composed of a cavity b and a cavity resonator 5b. The waveguide type high frequency filter 6
coupling holes 12a, 12b in which a and 6b are coupled to the main waveguide 1
May be different from each other depending on the frequency to be demultiplexed. Reference numeral 7 denotes coupling holes 12a, 1 inside the square main waveguide 1.
A thin metal plate inserted in the direction parallel to the side walls provided with the coupling holes 12a and 12b of the square main waveguide 1 near 2b, P1 is an input end of the square main waveguide 1, and P2 is a square main waveguide 1 Output end.

Next, the operation of the duplexer having the above configuration will be described. The fundamental mode of a radio wave having a plane of polarization parallel to the thin metal plate 7 in the lower frequency band among the total of four types of radio waves incident from the input end P1 of the square main waveguide 1 has a two-part coupling hole. The light is coupled to the fundamental mode of the rectangular branch waveguide 3a by 12a and propagates through the first waveguide high-frequency filter 6a. In the higher frequency band, the fundamental mode of a radio wave having a polarization parallel to the metal sheet 7 is a two-part coupling hole 1.
2b couples with the fundamental mode of the rectangular branch waveguide 3b and propagates through the second waveguide type high frequency filter 6b. Further, two types of radio waves having polarized waves in a direction perpendicular to the metal thin plate 7 are squarely guided without being coupled to the two-part coupling holes 12a and 12b and almost not reflected by the metal thin plate 7. It leaves the output end P2 of tube 1.

The distribution of the electromagnetic field in the main waveguide will be described with reference to FIG. In the above duplexer, the height of the square main waveguide 1 is now h, the height of the rectangular branch waveguides 3a and 3b is also h, and the division distance between the two-part coupling holes 12a and 12b is h / 2. Consider the case of symmetrical arrangement. Here, the fundamental mode of the radio wave incident from the input end 5, that is, the TE10 mode, has a magnetic field distribution shown in FIG. 2 in the cross section of the rectangular main waveguide 1. Here, due to the vertical symmetry of the structure of the duplexer, the vertical symmetry plane in FIG. 2 is always an electric wall. Further, the cross-sectional shape of the duplexer vertically divided by the electric wall is also vertically symmetrical. Therefore, in FIG. 2, all the upper and lower four equally divided surfaces are necessarily electric walls. On the other hand, the TM21 mode and the TE21 mode, which are one of the higher-order modes that most affect the deterioration of the demultiplexing characteristics, are two of the upper and lower four equally divided surfaces in the cross section of the duplexer as shown in FIGS.
It can only occur if one becomes a magnetic wall. Therefore, FIG.
In the duplexer according to the above configuration, the state shown in FIG. 2 is generated, so that the TM21 mode and the TE21 mode do not occur at all. Further, even when the height of the rectangular main waveguide 1 and the height of the rectangular branch waveguides 3a and 3b are different, while maintaining the condition of providing a coupling hole at a symmetrical position with respect to the vertical symmetry plane A, 2
By adjusting the division distance B between the division coupling holes 12a and 12b, a state similar to FIG. 2 can be created. Therefore, T
It is possible to suppress the occurrence of the M21 mode and the TE21 mode to some extent.

As described above, according to the duplexer of the first embodiment shown in FIG. 1, two parallel and opposite wall surfaces of the square main waveguide 1 are formed so as to suppress the occurrence of higher-order modes at the branch portion. A coupling hole 12 divided into two between the two rectangular branch waveguides 3a and 3b in a direction perpendicular to the tube axis of the square main waveguide 1.
The configuration of a and 12b has the effect of obtaining good demultiplexing characteristics even when the area of the coupling hole is very small in order to reduce unnecessary coupling between the coupling holes facing each other.

Embodiment 2 FIG. In the first embodiment of the present invention, the square main waveguide 1 is provided with coupling holes divided into two on the two parallel facing wall surfaces in a direction perpendicular to the tube axis of the rectangular main waveguide 1. However, as shown in FIG.
Between the two parallel facing wall surfaces of the square main waveguide 1 and the two rectangular branch waveguides 3a and 3b, the tube axis of the square main waveguide 1 is maintained while maintaining the condition of symmetry about the upper and lower object plane A. Coupling holes 13a, 1 divided into four at right angles
Even if 3b is provided, the same equally-divided electric wall as shown in FIG. 2 can be obtained, and the same effect as in the first embodiment can be expected. Further, the same effect can be obtained even when the coupling holes are divided into 2n (n ≧ 3).

Embodiment 3 Third Embodiment A duplexer according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a perspective view showing the configuration of the waveguide type duplexer of the present embodiment. In the figure, reference numeral 14 denotes a rectangular main waveguide for transmitting radio waves in a certain frequency band. Reference numerals 15a to 15d are provided on two parallel and opposed wall surfaces of the rectangular main waveguide 18 and are perpendicular to the tube axis of the rectangular main waveguide 14, and the vertical symmetry plane A of the wall surface is the same as in FIG. Is a coupling hole which is provided in two vertically symmetrically with respect to the center. Reference numerals 16a to 16d denote through the coupling holes 15a to 15d in directions perpendicular to the tube axis of the rectangular main waveguide 14 from two opposite wall surfaces of the rectangular main waveguide 14 parallel to the polarization plane of the transmitted radio wave. A plurality of cylindrical branch waveguides 17a to 17d, each of which branches, are a plurality of coupling holes 18a provided in these cylindrical branch waveguides.
18d are a plurality of cavity resonators partitioned by these coupling holes 17a-17d and two-part coupling holes 15a-15d, and 19a-19d are cylindrical branch waveguides 16a-16.
d, coupling holes 17a to 17d, and cavity resonators 18a to 18d
And a plurality of waveguide type high frequency filters.
The area of these coupling holes 15a to 15d may not be the same as each other depending on the branching frequency. Reference numeral 20 denotes a short-circuit conductor plate for short-circuiting one end of the rectangular main waveguide 14, P1
Is an input end of the rectangular main waveguide 1.

Next, the operation of the duplexer having the above configuration will be described. The fundamental mode of a radio wave of a certain frequency band incident from the input end P1 of the rectangular main waveguide 14 is a two-part coupling hole 15a.
-15d, the signal is divided into four frequency bands and propagates through the four waveguide high-frequency filters 19a to 19d. In the above duplexer, each of the two split coupling holes 15a, 1
5b, 15c and 15d are symmetrically divided into two around the vertical symmetry plane of the wall surface in a direction perpendicular to the tube axis of the rectangular main waveguide 18, so that the duplexer according to the first embodiment of FIG. Similarly to the above, a state similar to FIG. 2 is created by adjusting the division distance of the two-part coupling holes 15a to 15d, and TM
21 mode and TE21 mode can be suppressed to some extent.

As described above, according to the duplexer of the third embodiment shown in FIG. 6, two parallel opposite wall surfaces of the rectangular main waveguide 14 are formed so as to suppress the occurrence of higher-order modes at the branch portion. Between the four waveguide high-frequency filters 19a to 19d,
Since the coupling holes 15a to 15d are divided into two in a direction perpendicular to the tube axis of the rectangular main waveguide 14, even if the area of the coupling hole is extremely small in order to reduce unnecessary coupling between the coupling holes facing each other. There is an effect that good demultiplexing characteristics can be obtained over a wide band.

In the third embodiment of the present invention, the case where four split coupling holes and four waveguide type high frequency filters are provided has been described. Needless to say, a similar effect can be expected even when five or more are provided.

Embodiment 4 FIG. Fourth Embodiment A polarization splitter according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a perspective view showing the configuration of the waveguide type polarization splitter in the present embodiment. In the drawing, reference numeral 1 denotes a square main waveguide for transmitting a total of two types of radio waves each consisting of two orthogonal polarized waves, and 12a is provided on one wall surface of the square main waveguide 1 and has a square main waveguide. In a direction perpendicular to the tube axis of tube 1, FIG.
Similarly, 2
This is a divided coupling hole. A square branch waveguide 3a branched in a direction perpendicular to the tube axis of the square main waveguide 1, an inductive iris 4a in the square branch waveguide 3a, and a plurality of cavities partitioned by the inductive iris 4a and the coupling holes 12a. The resonator 5a and the waveguide-type high-frequency filter 6a constituted by these elements are equivalent to the corresponding elements in the first embodiment. The metal thin plate 7 inserted into the square main waveguide 1 and the square main waveguide 1
The input end P1 and the output end P2 of the square main waveguide 1 are the same as the corresponding numbers in the above embodiment.

Next, the operation of the above-structured demultiplexer will be described. The fundamental mode of the radio wave having a plane of polarization parallel to the thin metal plate 7 in the total of two types of radio waves incident from the input end P1 of the square main waveguide 1 is a square branch waveguide by the two-part coupling hole 12a. The light is coupled to the fundamental mode 3a and propagates through the waveguide type high frequency filter 6a. A radio wave having a plane of polarization perpendicular to the metal sheet 7 is divided into two split coupling holes 1.
The light exits from the output end P2 of the square main waveguide 1 without being coupled to 2a and hardly reflected by the thin metal plate 7. In the above polarization splitter, the two-part coupling hole 12
a is symmetrically divided into two in the direction perpendicular to the tube axis of the square main waveguide 1 about the vertical symmetry plane of the wall surface, and therefore, as in the case of the first embodiment of FIG. Split coupling hole 12
By adjusting the division distance of a, a state similar to FIG. 2 can be created, and the occurrence of the TM21 mode and the TE21 mode can be suppressed to some extent.

As described above, according to the polarization splitter of the fourth embodiment shown in FIG. 7, one wall surface of the square main waveguide 1 is provided so as to suppress the occurrence of higher-order modes at the branch portion. And one waveguide-type high-frequency filter 6a, the coupling hole 12a divided into two in a direction perpendicular to the tube axis of the square main waveguide 1.
Therefore, even when the area of the coupling hole is very small in order to reduce unnecessary reflection of the input radio wave at the incident end P1 of the square main waveguide 1, an effect of obtaining good demultiplexing characteristics over a wide band can be obtained. is there.

Embodiment 5 FIG. Hereinafter, a polarization splitter according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a perspective view showing the configuration of the waveguide type polarization splitter in the present embodiment. FIG. 9 is a diagram showing a magnetic field distribution in the polarization splitter having the configuration of FIG. In FIG. 8, reference numeral 1 denotes a square main waveguide for transmitting a total of two types of radio waves composed of two orthogonally polarized waves, and 12a and 12c denote square main waveguides 1.
2 and is vertically symmetrical about a vertical symmetry plane A of the wall surface in the direction perpendicular to the tube axis of the square main waveguide 1 in the direction perpendicular to the tube axis of the square main waveguide 1. It is a bonding hole. A rectangular branch waveguide 3a, a plurality of inductive irises 4a, a plurality of cavity resonators 5a, and a first waveguide high-frequency filter 6a composed of these are equivalent to the corresponding elements in the first embodiment. is there. The rectangular branch waveguide 3c branching in the other direction, the plurality of inductive iris 4c, the plurality of cavity resonators 5c, and the second waveguide type high frequency filter 6c composed of these are also each one of the first waveguides. Elements corresponding to those of the waveguide type high frequency high frequency filter 6a. Reference numeral 8 denotes a conductor short-circuit plate that short-circuits one end of the square main waveguide 1.

Next, the operation of the above-structured demultiplexer will be described. The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3a out of a total of two types of radio waves incident from the input end 5 of the square main waveguide 1 is a two-part coupling hole. The light is coupled to the fundamental mode of the rectangular branch waveguide 3a by 12a and propagates through the first waveguide high-frequency filter 6a. The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3c is the two-part coupling hole 12
c couples to the fundamental mode of the rectangular branch waveguide 3c and
In the waveguide type high frequency filter 6b. In the above polarization splitter, the two-part coupling holes 12a and 12c are each divided into two parts in a direction perpendicular to the tube axis of the square main waveguide 1 and vertically symmetrically with respect to the center line of the wall surface. Similarly to the duplexer according to the first embodiment, the two-part coupling hole 12
By adjusting the division distances a and 12c, a state similar to FIG. 2 is created, and the TM21 mode and the TE21
Mode generation can be suppressed to some extent. As shown in FIG. 9, the strongest part of the magnetic field component in the tube axis direction of the TE20 mode, which is a higher-order mode, which contributes most to unnecessary coupling between adjacent coupling holes, is the two-part coupling hole 1.
2c, because it corresponds to the conductor between the coupling holes 2c.
Unnecessary coupling given to the 2c by the TE20 mode is reduced, and therefore, occurrence of unnecessary cross polarization can be suppressed to some extent. The same applies to the fundamental mode of a desired radio wave to be coupled to the split coupling hole 12c, that is, the TE01 mode.

As described above, according to the polarization splitter of the fifth embodiment shown in FIG. 8, between the two adjacent wall surfaces of the square main waveguide 1 and the two waveguide high-frequency filters 6a and 6c. Since the coupling holes 12a and 12c are divided into two in the direction perpendicular to the tube axis of the square main waveguide 1, the area of the coupling holes is extremely small in order to reduce unnecessary coupling between adjacent coupling holes. In this state, there is an effect that good demultiplexing characteristics can be obtained over a wide band. Also, there is an effect that high isolation characteristics can be obtained.

Embodiment 6 FIG. A polarization splitter according to a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a perspective view showing the configuration of the waveguide type polarization splitter in the present embodiment. In the figure, reference numeral 1 denotes a square main waveguide for transmitting a total of four types of radio waves composed of two orthogonally polarized waves in two different frequency bands, and 12a, 12b, 12c and 12d denote four square main waveguides. 2 in a direction perpendicular to the tube axis of the square main waveguide 1.
Similarly, the coupling hole is divided into two vertically symmetrically with respect to the vertical symmetry plane A of the wall surface. A rectangular branch waveguide 3a, a plurality of inductive irises 4a, a plurality of cavity resonators 5a, and a first waveguide high-frequency filter 6a composed of these components are the same as corresponding elements in other embodiments. It is. Square branch waveguide 3b, plural inductive iris 4b, plural cavity resonators 5b, second waveguide high frequency filter 6b
And a rectangular branch waveguide 3c, an inductive iris 4c, a plurality of cavity resonators 5c, and a third waveguide high-frequency filter 6c.
Or a rectangular branch waveguide 3d, a plurality of inductive irises 4d,
The plurality of cavity resonators 5d and the fourth waveguide high-frequency filter 6d are also elements equivalent to the first waveguide high-frequency filter 6a and the configuration thereof, respectively. The conductor short-circuiting plate 8 and the input end P1 of the square main waveguide 1 are the same as those of the same number already described.

Next, the operation of the above-structured demultiplexer will be described. Basics of radio waves having a polarization plane that is perpendicular to the tube axis of the rectangular branch waveguide 3a in the lower frequency band among the total of four types of radio waves incident from the input end 5 of the square main waveguide 1 The mode is coupled to the fundamental mode of the rectangular branch waveguide 3a by the two-part coupling hole 12a, and the waveguide type high frequency filter 6a
Propagating inside. Further, the fundamental mode of the radio wave having a polarization perpendicular to the tube axis of the rectangular branch waveguide 3b in the higher frequency band is changed to the basic mode of the rectangular branch waveguide 3b by the two-part coupling hole 12b. The light is coupled and propagates through the waveguide type high frequency filter 6b. In addition, the fundamental mode of the radio wave having a polarization perpendicular to the tube axis of the rectangular branch waveguide 3c in the lower frequency band is changed to the basic mode of the rectangular branch waveguide 3c by the two-part coupling hole 12c. The light is coupled and propagates through the waveguide type high frequency filter 6c. Further, the fundamental mode of a radio wave having a polarization perpendicular to the tube axis of the rectangular branch waveguide 3d in the higher frequency band is changed to the fundamental mode of the rectangular branch waveguide 3d by the two-part coupling hole 12d. The light is coupled and propagates through the waveguide type high frequency filter 6d.

In the above polarization splitter, the two-part coupling hole 12
a, 12b, 12c and 12d are each divided into two in a direction perpendicular to the tube axis of the square main waveguide 1 and vertically symmetrically with respect to the wall center line. Therefore, similarly to the duplexer according to the first embodiment shown in FIG. 1, by adjusting the division distance of the two-part coupling holes 12a to 12d, a state similar to FIG. 2 is created, and the generation of the TM21 mode and the TE21 mode is reduced to some extent. It is possible to suppress. As in the case of the polarizer / demultiplexer of the fifth embodiment shown in FIG. 8, FIG. As shown, since the two-part coupling holes 12a to 12d correspond to the conductors between the coupling holes, unnecessary coupling given to the two-part coupling holes 12a to 12d in the TE20 mode is reduced, and therefore, unnecessary cross-polarization is generated to some extent. It is possible to suppress.

As described above, according to the polarization splitter of the sixth embodiment shown in FIG. 10, the four wall surfaces of the square main waveguide 1 and the four waveguide high-frequency filters 6a, 6b, 6c and 6d.
Are 2 in the direction perpendicular to the tube axis of the square main waveguide 1.
Divided coupling holes 12a, 12b, 12c and 12d
Therefore, even if the area of the coupling hole is very small in order to reduce unnecessary coupling between the coupling holes facing or adjacent to each other, there is an effect that good demultiplexing characteristics can be obtained over a wide band. Also, there is an effect that high isolation characteristics can be obtained. Furthermore, excellent separation can be obtained only by this configuration, and since there is no need for a combining circuit as in the conventional example, there is an effect that the whole polarization splitter can be downsized.

Embodiment 7 FIG. A configuration employing another method for avoiding interference at the time of branching will be described below. FIG.
FIG. 19 is a perspective view showing a configuration of a polarization splitter according to a seventh embodiment of the present invention. FIG. 12 is a diagram showing a magnetic field distribution in the polarizer having the configuration shown in FIG. In FIG. 11, reference numeral 1 denotes a square main waveguide for transmitting a total of two types of radio waves each composed of two orthogonal polarized waves, and reference numerals 21a and 21c denote square main waveguides on two adjacent wall surfaces of the square main waveguide 1. 1 is a coupling hole set such that the coupling center line is located on a quarter surface obtained by dividing each wall surface into four upper and lower parts. In the example shown in the figure, it is provided so as to be coupled to the center of about 1/4 surface from the top. A rectangular branch waveguide 3a, a plurality of inductive iris 4a,
A plurality of cavity resonators 5a, a first waveguide type high frequency filter 5a, a rectangular branch waveguide 3c, a plurality of inductive irises 4
c, the plurality of cavity resonators 5c, and the second waveguide high-frequency filter 6c are the same as corresponding elements in the other embodiments. The conductor short-circuit plate 8 is the same as that of the other embodiments.

Next, the operation of the above-structured demultiplexer will be described. The fundamental mode of the radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3a of the two types of radio waves incident from the input end P1 of the square main waveguide 1 is determined by the coupling hole 21a. The light is coupled to the fundamental mode of the rectangular branch waveguide 3a and propagates through the waveguide type high frequency filter 6a. Also,
The fundamental mode of the radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3c is coupled to the fundamental mode of the rectangular branch waveguide 3c by the coupling hole 21c and passes through the waveguide type high frequency filter 6c. Propagate.

In the polarization splitter, for example, the coupling hole 21
Since a is provided on the wall surface of the square main waveguide 1 at a position deviated from the center line of the square main waveguide 1 in the tube axis direction by about 1/4 of the wall height, as shown in FIG. When a radio wave in a direction perpendicular to the tube axis of the waveguide 3c is incident, the strongest point of the tube-axis direction magnetic field component of the TE02 mode, which is a higher-order mode that contributes most to unnecessary coupling between adjacent coupling holes. The coupling hole has come off from. Accordingly, unnecessary coupling between the coupling holes 21a and 21c is reduced, and as a result, the occurrence of unnecessary cross polarization can be suppressed to some extent. In addition, since the magnetic field distribution of TE10, which is the fundamental mode, is uniform in the height direction, the deterioration of the desired coupling due to the detachment of the coupling hole 21a is small. The same applies to the coupling hole 21c.

As described above, according to the polarization splitter of the seventh embodiment shown in FIG. 11, between the two adjacent wall surfaces of the square main waveguide 1 and the two waveguide high-frequency filters 6a and 6c. ,
Since the coupling holes 21a and 21c are formed at positions deviated by ４ from the center line in the tube axis direction of the square main waveguide 1 in wall height, unnecessary coupling between adjacent coupling holes is reduced, and high isolation is achieved. There is an effect that characteristics can be obtained.

Another polarization splitter of this embodiment will be described with reference to FIG. In the figure, 22a and 22c are respectively located on two adjacent wall surfaces of the square main waveguide 1 at positions that are approximately ４ of the wall height in a direction away from the center line of the square main waveguide 1 in the tube axis direction. The coupling holes are provided one by one. Hereinafter, a square main waveguide 1, a square branch waveguide 3a, a plurality of inductive irises 4a, a plurality of cavity resonators 5a, a first waveguide high-frequency filter 6a, a square branch waveguide 3c, a plurality of The inductive iris 4c, the plurality of cavity resonators 5c, the second waveguide high-frequency filter 6c, and the like are the same as the corresponding elements in the above embodiment.

The operation of the polarizer / demultiplexer having the above configuration is the same as that of the polarizer / demultiplexer shown in FIG. The same applies to the characteristics.

FIG. 14 shows another polarization splitter of this embodiment. In FIG. 14, 23a and 23c
Are provided on two adjacent wall surfaces of the square main waveguide 1 at positions deviated from the center line of the square main waveguide 1 in the tube axis direction by １ ／ of the wall height in the right-handed rotating direction. It is a bonding hole. Other elements are the same as those of the above embodiment.

As described above, the height of the coupling hole is 1/1 from the center line.
Any combination may be used as long as the combination is provided at four shifted positions.

Embodiment 8 FIG. An eighth embodiment of the present invention will be described with reference to FIG. In the drawing, reference numeral 10 denotes a circular main waveguide for transmitting a total of two types of radio waves composed of two orthogonal polarized waves, and 11 denotes a circular main waveguide 10.
Is a short-circuit conductor plate provided at one end of the short-circuit conductor plate. 24c and 24a are approximately 1 wavelength of the wavelength in the circular main waveguide in the operating frequency band from the short-circuit conductor plate 11 on the wall surface of the circular main waveguide 10.
A coupling hole is provided at a position separated by 以下 or less and a position separated by about ／ of the in-tube wavelength, one by one so that the respective hole surfaces are orthogonal to each other. 25a and 25c are two-stage rectangular waveguide steps respectively connected to the coupling holes 24a and 24c, and 3a and 3c are coupling holes 2a and 2c from the circular main waveguide 8.
4a, 24c and two-stage rectangular waveguide steps 25a, 25
2 branch each other so that the pipe axes are orthogonal to each other via c
There are two rectangular branch waveguides. Here, step 25a is lower than waveguide 3a, and step 25c is lower than waveguide 3c. The lengths from the coupling holes 24a, 24c to the waveguides 3a, 3c are C and D, respectively. Other elements are equivalent to the elements of the corresponding numbers in the above embodiment.

Next, the operation of the above-structured demultiplexer will be described. The fundamental mode of the radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3a among the two types of radio waves incident from the input end P1 of the circular main waveguide 10 is the coupling hole 24a.
To the fundamental mode of the rectangular waveguide step 25a and the rectangular branch waveguide 3a, thereby forming the waveguide type high frequency filter 6a.
Propagating inside. The fundamental mode of a radio wave having a plane of polarization perpendicular to the tube axis of the rectangular branch waveguide 3c is the coupling hole 2
4c couples with the fundamental mode of the rectangular waveguide step 25c and the rectangular branch waveguide 3c and propagates through the waveguide type high frequency filter 6c.

In the above-described polarization splitter, the two-stage rectangular waveguide steps 25a and 25c function as an impedance transformer by changing the height of the rectangular waveguide between the two stages. The circular waveguide between the coupling hole 24a and the short-circuit conductor plate 11 functions as a stub by changing the length of the tube axis. Similarly, the short-circuit conductor plate 1
The circular waveguide between 1 functions as a stub by changing its tube axis length. On the other hand, the stub function of the circular waveguide can be interpolated by expanding and contracting the tube axis lengths C and D of the rectangular waveguide between the two steps. Therefore, a desired radio wave can be branched according to the frequency band in a state where the distance between the coupling hole 24c and the short-circuit conductor plate 11 is sufficiently small.
At this time, by adjusting the lengths C and D between the steps of the rectangular branch waveguides 3a and 3c, a desired radio wave is efficiently extracted to the rectangular branch waveguides 3a and 3c.

As described above, according to the polarization splitter of the tenth embodiment shown in FIG. 15, a desired radio wave is efficiently branched while the distance between the coupling hole 24c and the short-circuit conductor plate 11 is sufficiently small. Since the waveguides 3a and 3c are configured to be extracted, the two coupling holes 24a and 2a are located at a short distance from the short-circuit conductor plate.
4c can be increased, and the overall structure of the polarization splitter can be made compact to obtain high isolation characteristics.

In the eighth embodiment of the present invention, a similar effect can be expected by using a square main waveguide as shown in FIG. 16 instead of the circular waveguide.

[0061]

As described above, according to the present invention, two coupling surfaces which are vertically symmetrical with respect to a center line divided into two in the height direction of two opposing wall surfaces of the main waveguide are provided and branched.
Since two waveguide-type high-frequency filters are formed, there is an effect that a good demultiplexing characteristic can be obtained in a small-sized and wide band.

Furthermore, since a plurality of waveguide type high frequency filters are provided, each branching in a direction perpendicular to the tube axis of the main waveguide, the apparatus can be downsized and many frequency bands to be used can be finely separated. There is an effect that can be done.

A main waveguide having a conductor short-circuit plate at one end, and a coupling surface vertically symmetrical with respect to a center line divided into two in the height direction of two wall surfaces provided on two adjacent wall surfaces of the main waveguide are provided. The two waveguide-type high-frequency filters that branch off
There is an effect that a good demultiplexing characteristic can be obtained over a wide band over a small size.

Further, since the coupling hole is a coupling hole divided into 2n (n ≧ 2), there is an effect that a good demultiplexing characteristic can be obtained in a small size over a wider band.

According to the present invention, the main waveguide is short-circuited at one end, and is branched by the coupling hole on the line which is shifted from the center line by 1/4 in the height direction of the two walls provided adjacent to the main waveguide. Since the waveguide-type polarization splitter is constituted by the two waveguide-type high-frequency filters described above, it is possible to obtain a compact and high isolation characteristic.

According to the present invention, the main waveguide short-circuited at one end and the distance from the short-circuit plate at right angles to the center axis of the main waveguide are one-fourth of the wavelength of the branched signal.
The other is a waveguide filter having a two-step height, which branches off from the place where the wavelength is within about 3/4 of the same wavelength and spreads in the direction away from the main waveguide. Since it is composed of a waveguide type polarization splitter, it is compact,
There is an effect that high isolation characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a waveguide type duplexer according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing a TE10 mode electromagnetic field distribution in the main waveguide of the waveguide type duplexer according to the first embodiment.

FIG. 3 is a cross-sectional view illustrating a TM21 mode electromagnetic field distribution in a main waveguide of the waveguide type duplexer according to the first embodiment.

FIG. 4 is a cross-sectional view illustrating a TE21 mode electromagnetic field distribution in the main waveguide of the waveguide type duplexer according to the first embodiment.

FIG. 5 is a perspective view showing a configuration of a waveguide type duplexer according to Embodiment 2 of the present invention.

FIG. 6 is a perspective view showing a configuration of a waveguide type duplexer according to Embodiment 3 of the present invention.

FIG. 7 is a perspective view showing a configuration of a waveguide type polarization splitter according to Embodiment 4 of the present invention.

FIG. 8 is a perspective view showing a configuration of a waveguide type polarization splitter according to a fifth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a TE20 mode electromagnetic field distribution in a main waveguide of a waveguide type polarization splitter according to a fifth embodiment.

FIG. 10 is a perspective view showing a configuration of a waveguide type polarization splitter according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a waveguide type polarization splitter according to Embodiment 7 of the present invention.

FIG. 12 is a sectional view showing a TE02 mode electromagnetic field distribution in a main waveguide of a waveguide type polarization splitter according to a seventh embodiment.

FIG. 13 is a perspective view showing a configuration of another waveguide type polarization splitter according to the seventh embodiment.

FIG. 14 is a perspective view showing a configuration of another waveguide type polarization splitter according to a seventh embodiment of the present invention.

FIG. 15 is a perspective view showing a configuration of a waveguide type polarization splitter according to an eighth embodiment of the present invention.

FIG. 16 is a perspective view showing a configuration of another waveguide type polarization splitter according to the eighth embodiment.

FIG. 17 is a schematic configuration diagram showing a conventional waveguide type duplexer.

FIG. 18 is a schematic configuration diagram showing a conventional waveguide type polarization splitter.

FIG. 19 is a schematic configuration diagram showing a conventional waveguide type polarization splitter.

FIG. 20 is a schematic configuration diagram showing a conventional waveguide type polarization splitter.

FIG. 21 is a schematic configuration diagram showing a conventional waveguide type polarization splitter.

[Explanation of symbols]

1 square main waveguide, 3a, 3b, 3c, 3d square branch waveguide, 4a, 4b, 4c, 4d inductive iris,
5a, 5b, 5c, 5d cavity resonators, 6a, 6b, 6
c, 6d Waveguide type high frequency filter, 7 Metal sheet, 8
Conductor short-circuiting plate, 10 circular main waveguide, 11 conductor short-circuiting plate, 12a, 12b, 12c, 12d split coupling hole,
13a, 13b, 13c, 13d 4 split coupling holes, 14
Square main waveguide, 15a, 15b, 15c, 15d 2
Split coupling holes, 16a, 16b, 16c, 16d circular branch waveguides, 17a, 17b, 17c, 17d coupling holes,
18a, 18b, 18c, 18d Circular cavity resonator, 1
9a, 19b, 19c, 19d Waveguide high-frequency filter, 20 short-circuit conductor plate, 21a, 21c coupling hole, 22
a, 22c coupling hole, 23a, 23c coupling hole, 24
a, 24c coupling holes, 25a, 25c rectangular waveguide steps.

Claims (9)

[Claims] A first waveguide facing the center axis of the main waveguide;
In a waveguide type duplexer using a waveguide type filter having a coupling hole provided on one wall surface, each of the waveguide type filters is arranged in a height direction of one wall surface of the main waveguide. A waveguide-type duplexer, wherein two coupling holes are provided in a vertically symmetrical manner on a center line divided into two. 2. The waveguide type duplexer according to claim 1, wherein the waveguide type filter is provided so as to face a central axis of the main waveguide. 3. A waveguide type polarization splitter using a waveguide type filter having a coupling hole provided on a wall surface of a main waveguide, wherein the waveguide type filter comprises a wall surface of the main waveguide. 2. A waveguide type polarization splitter comprising two coupling holes provided vertically symmetrically on a center line divided into two in the height direction. 4. A short-circuit plate is provided at one end of the main waveguide, two waveguide filters are provided, and near the short-circuit plate, in a direction perpendicular to the central axis of the main waveguide. 4. The filter according to claim 3, wherein each of the waveguide filters is provided with two coupling holes vertically symmetric with respect to a center line divided into two in the height direction of the wall surface of the main waveguide. Waveguide type polarizer. 5. A short-circuit plate is provided at one end of the main waveguide, and four waveguide filters are provided, and each of the filters is provided near the short-circuit plate in a direction perpendicular to the central axis of the main waveguide. Install,
4. The waveguide according to claim 3, wherein each of the waveguide filters has two coupling holes vertically symmetrical with respect to a center line divided into two in a height direction of a wall surface of the main waveguide. Tube type polarizer. 6. The waveguide type demultiplexer according to claim 1, wherein the number of coupling holes in the main waveguide is 2n, where n is a positive integer of 2 or more. Or waveguide type polarization splitter. 7. A waveguide type polarization splitter using a plurality of waveguide type filters having a short-circuit plate at one end of a main waveguide and having a coupling hole provided on a wall surface of the main waveguide. In the above, two waveguide filters are installed at right angles to each other with respect to the central axis of the main waveguide, and are parallel to the central axis divided into approximately four equal parts in the height direction of the wall surface of the main waveguide. A waveguide type polarization splitter, wherein a coupling hole is provided at the center of one of upper and lower quarters. 8. A waveguide type filter of a main waveguide, wherein two filters are arranged at right angles to a center axis of the main waveguide, and a distance from a short-circuit plate provided on the main waveguide is divided into one signal wavelength. , And the other is placed at a distance of about ／ wavelength from the same wavelength, and each of the waveguide filters extends in a direction away from the main waveguide. 8. A waveguide type polarization splitter according to claim 7, wherein said waveguide type polarization splitter has a stepped height. 9. The waveguide type duplexer or waveguide type duplexer according to claim 7, wherein the main waveguide has a square shape.