JPS6351702A - Waveguide type band area blocking filter - Google Patents

Abstract

PURPOSE:To prevent a cavity from being protruded outside a wave guide, to miniaturize and make a device light weight, and to lower cost, by blocking an unrequired wave by arranging at least a sheet of metallic plate having a coupling hole in the waveguide. CONSTITUTION:When fundamental wave TE modes of a positive and a negative phases inversed mutually, are propagated on a first fundamental wave TE mode transmission line 9, and a second fundamental wave TE mode transmission line 10, since waves having negative phases with each other and resonating with the coupling hole out of them, become the in-phase hybrid waves, respective main electric field of which is in parallel with the coupling hole 11 plane, the unrequired wave is propagated to an output terminal side when it resonates. Also, non-resonant signal waves having the negative phases with each other desired to be propagated, are propagated without being affected by the coupling hole 11. In addition to that, since it is possible to constitute a fin line cavity in the waveguide 1 only by using the metallic plate 8 in the waveguide 1, the filter can be made light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention is applicable to the necessary frequency W? of the microwave band. This invention relates to a waveguide type band-elimination filter that passes through the frequency range and blocks unnecessary frequency bands.

[Prior Art] Conventionally, in a waveguide-type band-stop device in the microwave band, as shown in FIG. 4, a long hole 2 for coupling unnecessary waves is provided in the wide wall of a waveguide 1. The structure was such that a cavity 3 was attached to the outside to resonate with the unwanted waves. In addition, when such a waveguide-type band-stop waveform is used in a coaxial transmission system, a coaxial waveguide converter 6 is connected to the input end 4 and output end 5 of the waveguide 1, as shown in FIG. .7 was attached to each.

[Problems to be Solved by the Invention] However, in the waveguide-type band-stop device as shown in FIGS. 4 and 5, the cavity 3 protrudes outside the waveguide 1 and There was a problem that the size was large. Furthermore, in the waveguide type band-stop device used in the coaxial transmission system shown in FIG. 5, there is a problem in that the coaxial waveguide converters 6 and 7 are used, so that the dimensions are long in the tube axis direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waveguide type band-stop device that can be made smaller and lighter, and can reduce manufacturing costs.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained with reference to FIGS. 1 to 3 corresponding to the embodiments. At least one metal plate 8 is oriented parallel to the tube axis of the waveguide 1 and the fundamental wave TE of the waveguide 1 is oriented parallel to the tube axis of the waveguide 1.
A first fundamental wave TE mode transmission line 9 is provided in the waveguide 1 on both sides of the metal plate 8, and a fundamental wave TE mode propagating through the transmission line 9 is disposed as a partition wall perpendicular to the main electric field of the mode. A second fundamental wave TE mode transmission line 10 is formed which propagates the fundamental wave TE mode which is in a mutually opposite phase relationship, and a coupling hole 11 is formed in the metal plate 8 to resonate with the band stop wave. It is characterized by

[Function] The first fundamental wave TE of such a waveguide type band-stop or wave device
When a fundamental wave TE mode having a positive phase and a mutually opposite phase is propagated through the first fundamental wave TE mode transmission line 10 and the second fundamental wave TE mode transmission line 10, among them, mutually opposite phase waves resonating in the coupling hole 11 are generated. Since each main electric field becomes an in-phase hybrid wave parallel to the surface of the coupling hole 11, when an unnecessary wave resonates, the unnecessary wave is not propagated to the output end side. Further, non-cooperative signal waves having mutually opposite phases that are to be propagated are propagated without being influenced by the coupling hole 11. Furthermore, by simply using the metal plate 8 inside the waveguide 1, a FINLINE cavity can be formed inside the waveguide 1, so that the weight can be reduced.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. The waveguide type band-stop wave device of this example is as follows:
A direction parallel to the wide surface of the rectangular waveguide 1 (a direction parallel to the tube axis and orthogonal to the main electric field of the fundamental TE mode ) with metal plate 8
is arranged, and both ends of the metal plate 8t in the width direction are fixed to the narrow surface of the rectangular waveguide 1. Inside the waveguide 1 are a first fundamental wave TE mode transmission line 9 which is partitioned by the metal plate 8 and which transmits the fundamental wave TE mode;
A second fundamental wave TE mode transmission line 10 is formed that propagates a fundamental wave TE mode that is in an opposite phase relationship with the fundamental wave TE mode that propagates the fundamental wave TE mode and has substantially the same electric field magnitude. In the middle of the metal plate 8 in the longitudinal direction, there are a plurality of long coupling holes 11 (in two stages in the embodiment) along the width direction.
It is set in. The length of the coupling hole 11 is determined to be an integral multiple of about 1/2 of the wavelength of the unnecessary frequency whose passage is desired to be blocked. At both ends of the metal plate 8 in the longitudinal direction, 79991 parts 1
2.13 are provided respectively.

Each 79991 part 12.13 has slits 14.1 cut in the width direction at positions near both ends of the metal plate 8 in the length direction.
It has a structure in which protruding pieces 16 and 17 are formed through 5. Rectangular waveguide 1 corresponding to each 79991 part 12.13
Through holes 18 and 19 are respectively provided in the narrow faces of the input side coaxial portion 20 and the output side coaxial portion 21 are provided in these through holes 18 and 19, respectively, and the respective center conductors 2OA and 21A are connected to the center conductor 18 and 12. It is connected to the protruding pieces 16 and 17 of 13. The 79991 part 12.13 has the function of mutually converting the coaxial transmission system and the waveguide transmission system, and the function of converting the first fundamental wave TE mode transmission line and the second fundamental wave transmission line separated by the metal plate 8. Each fundamental wave TE mode transmission line 10 has a function of exciting fundamental wave TE modes having mutually opposite phases.

In such a waveguide-type band-stop device, when the frequency f to be passed in the TEM mode and the unnecessary frequency fR are applied to the input side coaxial section 20, the 79991 section 12
Two fundamental waves TE with mutually opposite phases and approximately equal electric field magnitudes
mode, and these two mutually opposite-phase waves are excited in the first fundamental wave TE mode transmission line 9 and the second fundamental wave TE mode transmission line 10. In this case, if the length of the coupling hole 11 is set to a length that resonates at approximately 1/2 of the wavelength λ1 of the unnecessary frequency f, the waves of extremely opposite phase of the unnecessary frequency rR will be in phase at the coupling hole 11. It resonates, is reflected to the power supply side, and is blocked from passing through. On the other hand, the frequency r1. f
, the waves reach the magic E part 13 on the output side while maintaining the relationship of positive phase and negative phase without being affected by the coupling hole 11, are converted to the TEM mode, and are output to the coaxial part 21 on the output side. be done.

Note that the load Q on the coupling hole 11 can be changed depending on the slot width of the coupling hole 11 and the angle between the long axis of the coupling hole 11 and the tube axis.

Further, a plurality of metal plates 8 may be provided in the same way, with their positions shifted in the height direction of the narrow surface of the waveguide 1.

Furthermore, the input section and the output section can also be formed by a waveguide whose interior is partitioned to form a plurality of transmission paths corresponding to the waveguide 1. In this case, the input section is configured to input the H signal in reverse phase.

Furthermore, the present invention can be similarly applied to cases where the waveguide 1 is a double rich waveguide or a circular waveguide.

[Effects of the Invention] As explained above, the waveguide-type band-stop wave device according to the present invention has at least one metal plate having a coupling hole disposed within the waveguide and coupled within the waveguide. Since the holes are used to block unnecessary waves, there is no need for the cavity to protrude outside the waveguide as in the conventional case, making it possible to reduce the size and weight of the waveguide and reduce costs. Another advantage is that the stopband width can be changed by changing the dimensions and shape of the coupling.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a waveguide type band-stop or wave device according to the present invention, and FIG. 2 is a magic E of FIG. 1.
FIG. 3 is a cross-sectional view taken along the line X-X in FIG.
FIG. 4 and FIG. 5 are both perspective views of conventional waveguide type band-stop filters. DESCRIPTION OF SYMBOLS 1... Waveguide, 8... Metal plate, 9... First fundamental wave TE mode transmission line, 10... Second fundamental wave TE mode 1 Fig. 2 Fig. 3 Fig. 7 of ,! (Fig. 4, Fig. 5, Proceedings) December 23, 1985, Commissioner of the Patent Office, Kuro 1) Mr. Akihiro 1, Indication of the case, Patent Application No. 1984-194025, 2, Name of the invention: Waveguide Shape band-stopping waveform device 3, relationship with the case of the person making the amendment Patent applicant Shimada Rika Kogyo Co., Ltd. 4, agent 6th floor 5, Bunzan Building, 14-31-6 Shin 14-31-6, Minato-ku, Tokyo, the person making the amendment In each column of "Claims" and "Detailed Description of the Invention" and in the second line of page 5 of Figure 1 (2) of the drawings, "consist of" is corrected to "consist of". (3) Page 5, lines 9 to 12, “The coupling hole 11...
ing. ” is corrected as follows. The coupling holes 11 are provided in multiple stages (two stages in the example) at intervals of about 32R/4 (where λR is the unnecessary frequency fR wavelength).The length of each coupling hole 11 is set to prevent passage. (4) Correct "double rich" in line 15 of page 7 to "double ridge." [8] Figure 1 of the drawing is corrected as shown in the attached sheet. Above 2, Claims At least one metal plate is disposed within the waveguide as a partition in a direction parallel to the tube axis of the waveguide and orthogonal to the main electric field of the fundamental TE mode of the waveguide. In the waveguides on both sides of the metal plate, a fundamental wave TE mode is propagated, which has an opposite phase relationship with the first Fumoto wave TE mode transmission line and the fundamental wave TE mode propagating through the transmission line. A waveguide-shaped band characterized in that a second fundamental wave TE mo group transmission path is formed, and the metal plate is provided with a coupling hole that resonates with the band-stop wave! ii! Block or wave device. Figure 1 A Reformation (1. Procedural amendment (voluntary) October 27, 1988 2. Name of the invention Waveguide type band-stop wave device 3. Relationship with the case of the person making the amendment Patent applicant Shimada Rika Kogyo Co., Ltd. 4, Agent 6th floor 5, Bunzan Building, 4-31-6 Shinbashi, Minato-ku, Tokyo, Subject of amendment (1) The entire text of the specification is corrected as shown in the attached sheet. Name of the invention Waveguide-type band-stop wave device 2, Claims At least one metal plate in the waveguide is oriented parallel to the tube axis of the waveguide, and the fundamental wave TE of the waveguide is oriented parallel to the tube axis of the waveguide. A first fundamental wave TE mode transmission line and a fundamental wave TE mode propagating through the transmission line are disposed as partition walls orthogonal to the main electric field of the mode, and in the waveguide on both sides of the metal plate, the fundamental wave TE mode propagating through the transmission line has opposite phases. A second fundamental wave TE mode transmission line is formed to propagate a fundamental wave TE mode having the relationship of: Wave-tube-type band-stop filter. 3. Detailed description of the invention [Field of industrial application] The present invention is a wave-guide-type band-elimination filter that passes necessary frequency bands in the microwave band and blocks unnecessary frequency bands. [Prior Art] Conventionally, a waveguide-type band-stop or wave device in the microwave band prevents unnecessary waves from being generated on the wide wall of the waveguide 1, as shown in FIG. It had a structure in which a long hole 2 for coupling was provided, and a cavity 3 that resonated with the unwanted wave was attached to the outside of the hole 2.In addition, such a waveguide type band vj and blocking band waver were used for coaxial transmission. When used in a system, coaxial waveguide converters 6 and 7 were attached to the input end 4 and output end 5 of the waveguide 1, respectively, as shown in FIG. 3. [Problems to be Solved by the Invention] ] However, the waveguide-type band-stop wave device shown in FIGS. 2 and 3 has a problem in that the cavity 3 protrudes outside the waveguide 1 and the vertical dimension becomes large. In addition, the waveguide band used in the coaxial transmission system shown in Fig. 3 [in the blocking transducer, there is a problem that the dimensions are longer in the tube axis direction because the coaxial waveguide converter 6.7 is used. An object of the present invention is to provide a waveguide type band-stop filter that can be made smaller and lighter, and can reduce manufacturing costs. [Means for solving the problems] The above-mentioned The structure of the present invention for achieving the object will be explained with reference to FIG. 1 corresponding to an embodiment. Fii! A first fundamental wave TE mode transmission line 9 is provided in the waveguide 1 on both sides of the metal plate 8, and a fundamental wave having a phase opposite to the fundamental wave TE mode propagating through the transmission line 9 is provided. The second wave transmits the TE mode.
A fundamental wave TE mode transmission line 10 is formed, and the metal plate 8 is provided with a coupling hole 11 that resonates with a band-stop wave. [Function] Such a waveguide band II! When the fundamental wave TE modes of normal phase and antiphase are propagated in the first fundamental wave TE mode transmission line 9 and the second fundamental wave TE mode transmission line 10 of the blocking shield waver, their Of these, the mutually opposite phase waves that resonate in the coupling hole 11 become in-phase hybrid waveguides whose main electric fields are parallel to the surface of the coupling hole 11, so that when an unnecessary wave resonates, the unnecessary wave is not propagated to the output end side. Further, non-resonant signal waves having mutually opposite phases that are to be propagated are propagated without being affected by the coupling hole 11. Furthermore, by simply using the metal plate 8 inside the waveguide 1, a FINLINE cavity can be formed inside the waveguide 1, so that the weight can be reduced. [Example] Hereinafter, an example of the present invention will be described in detail with reference to FIG. The waveguide-type band-stop wave device of this embodiment has a rectangular waveguide 1 at a position parallel to the wide surface of the rectangular waveguide 1 (with respect to the tube axis) at a central position in the width direction of the narrow surface of the rectangular waveguide 1. parallel and fundamental wave TE
A metal plate 8 is disposed in a direction perpendicular to the main electric field of the mode, and both widthwise ends of the metal plate 8 are fixed to the narrow side of the rectangular waveguide 1. Inside the waveguide 1, there is a first fundamental wave TE mode transmission line 9 that transmits the fundamental wave TE mode of the phase partitioned by the metal plate 8, and a fundamental wave TE mode that is compatible with the fundamental wave TE mode that propagates through the transmission line 9. A second fundamental wave TE mode transmission line 10 is formed which propagates a fundamental wave TE mode having an opposite phase relationship and having substantially the same electric field magnitude. metal plate 8
In the middle of the longitudinal direction, there are a plurality of coupling holes 11 formed of elongated holes along the width direction at intervals of about 3λR/4 (however, λ1 is the unnecessary frequency fR wave) (in the embodiment, there are two coupling holes 11). ). The length of each coupling hole 11 is determined to be an integral multiple of approximately 1/2 of λR of the unnecessary frequency fR whose passage is desired to be prevented. At both ends of the metal plate 8 in the longitudinal direction, 79795
12 and 13 are respectively provided. 79795 each
The portions 12.13 have a structure in which projecting portions 16 and 17 are formed at positions near both ends of the metal plate 8 in the length direction through slits 14.15 cut in the width direction. 797 each
Through holes 18 and 19 are provided in the narrow surface of the rectangular waveguide 1 corresponding to the 95 parts 12 and 13, respectively.
．． 19 is provided with an input side coaxial section 20 and an output side coaxial section 21, each having a center conductor 20A. 21A is connected to the projecting piece 16°17 of the 79795 part 12.13. The 79795 part 12.13 has a function of mutually converting between a coaxial transmission system and a waveguide transmission system, and a function of converting the first fundamental wave TE mode transmission line 9 and the second fundamental wave transmission line 9 separated by a metal plate 8. The fundamental wave TE mode transmission lines 10 each have a function of exciting fundamental wave TE modes having mutually opposite phases. In such a waveguide type band-stop device, when the frequency f to be passed in the 72M mode and the unnecessary frequency fR are applied to the input side coaxial section 20, the 79795 section 12
Two fundamental waves TE with mutually opposite phases and approximately equal electric field magnitudes
mode, and these two mutually opposite-phase waves are excited in the first fundamental wave TE mode transmission line and the second fundamental wave TE mode transmission line 10. In this case, if the length of the coupling hole 11 is set to a length that resonates at approximately 1/2 of the wavelength λ1 of the unnecessary frequency fIl, the waves of the unnecessary frequency fR that are in opposite phases to each other become in phase at the coupling hole 11. They take pictures together, reflect on the power supply side, and are blocked from passing. On the other hand, the frequency fp that you want to pass
The wave reaches the 79795 section 13 on the output side while maintaining the relationship of positive phase and negative phase without being affected by the coupling hole 11, is converted into the 72M mode, and is output to the output side coaxial section 21. . Note that the load Q on the coupling hole 11 can be changed depending on the slot width of the coupling hole 11 and the angle between the long sleeve of the coupling hole 11 and the tube axis. Further, a plurality of metal plates 8 may be provided in the same way, with their positions shifted in the height direction of the narrow surface of the waveguide 1. Furthermore, the input section and the output section can also be formed by a waveguide whose interior is partitioned to form a plurality of transmission paths corresponding to the waveguide 1. In this case, the inputs are made to be input in opposite phases to each other. Furthermore, the present invention can be similarly applied to cases where the waveguide 1 is a double ridge waveguide or a circular waveguide. [Effects of the Invention] As explained above, the waveguide-type band-stop wave device according to the present invention has at least one metal plate having a coupling hole disposed within the waveguide and coupled within the waveguide. Since the holes are used to block unnecessary waves, there is no longer a cavity protruding outside the waveguide as in the conventional case, making it smaller and lighter and reducing costs. . Further, there is an advantage that the width of the blocking zone l111 can be changed by changing the size and shape of the bond. 4. Brief explanation of the drawings Figure 1 shows a waveguide band ii! according to the present invention. FIGS. 2 and 3 are partially cutaway perspective views showing one embodiment of a waveguide type band stop waver, and FIGS. 2 and 3 are perspective views of conventional waveguide type band stop wavers. DESCRIPTION OF SYMBOLS 1... Waveguide, 8... Metal plate, 9... First fundamental wave TE mode transmission line, 10... Second fundamental wave TE mode transmission line, 11... Coupling hole. @Figure 1

Claims (1)

[Claims] At least one metal plate is disposed within the waveguide as a partition wall in a direction parallel to the tube axis of the waveguide and orthogonal to the main electric field of the fundamental TE mode of the waveguide, and on both sides of the metal plate. In the waveguide, there are a first fundamental wave TE mode transmission line and a second fundamental wave TE mode that propagates a fundamental wave TE mode that is in an opposite phase relationship with the fundamental wave TE mode propagating through the transmission line. 1. A waveguide type band-elimination filter, characterized in that an anti-phase transmission path is formed, and the metal plate is provided with a coupling hole that resonates with a band-elimination wave.