CN216354714U - Orthogonal mode coupler OMT based on coaxial waveguide - Google Patents
Orthogonal mode coupler OMT based on coaxial waveguide Download PDFInfo
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Abstract
The utility model relates to an orthogonal mode coupler OMT based on a coaxial waveguide, which comprises a cross center module, a horizontal polarization combiner and a vertical polarization combiner; the cross center module comprises a first side arm guided wave, a second side arm guided wave and a coaxial waveguide; the first side arm guided wave and the second side arm guided wave are arranged in a crossed and vertical mode; the coaxial waveguide is arranged at the intersection of the first side arm guided wave and the second side arm guided wave; a step structure for separating or synthesizing electromagnetic waves is arranged in the intersection of the first side arm guided wave and the second side arm guided wave; the horizontal polarization combiner is connected at the two ends of the first side arm guided wave, and the vertical polarization combiner is connected at the two ends of the second side arm guided wave. The stepped structure is arranged at the intersection of the first side arm guided wave and the second side arm guided wave, so that the separation and synthesis of electromagnetic waves in different modes can be realized, and the orthogonal mode coupler has the characteristics of excellent electrical performance and convenience in processing.
Description
Technical Field
The utility model relates to the technical field of microwave antennas, in particular to an orthogonal mode coupler OMT based on coaxial waveguide.
Background
With the development of communication technology, a microwave/millimeter wave integrated communication system becomes a technology that takes both communication rate and communication distance into consideration. The hybrid feed is a mode of fusing microwave and millimeter wave communication and enabling electromagnetic waves in two frequency bands to radiate through the same antenna. The millimeter wave is fed through a circular waveguide, and the microwave is fed through a coaxial waveguide. An orthogonal mode coupler (OMT) is a device that can synthesize or separate two orthogonal mode electromagnetic waves, and is a key device of polarization multiplexing technology.
Known coaxial waveguide OMTs have an asymmetric structure type and a symmetric structure type, and the asymmetric structure coaxial waveguide OMT has a problem of poor electrical performance when a broadband is wide, as shown in fig. 1, and the symmetric structure coaxial waveguide OMT has a problem of inconvenience in processing and the same direction of a coaxial waveguide and a rectangular waveguide, as shown in fig. 2. Therefore, in order to enable microwave communication in a microwave/millimeter wave converged wireless communication system to realize a polarization multiplexing function, it is necessary to use an OMT based on a coaxial waveguide and having good electrical performance.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the problems that the electrical performance of the asymmetric coaxial waveguide OMT is poor when the broadband is wide and the symmetric coaxial waveguide OMT is inconvenient to process in the prior art.
In order to solve the above technical problem, the present invention provides an orthogonal mode coupler OMT based on a coaxial waveguide, comprising: the cross center module, the horizontal polarization combiner and the vertical polarization combiner;
the cross center module comprises a first side arm guided wave, a second side arm guided wave and a coaxial waveguide;
the first side arm guided wave and the second side arm guided wave are arranged in a crossed and vertical mode;
the coaxial waveguide is arranged at the intersection of the first side arm guided wave and the second side arm guided wave;
a step structure for separating or synthesizing electromagnetic waves is arranged in the intersection of the first side arm guided wave and the second side arm guided wave;
the horizontal polarization combiner is connected to two ends of the first side arm guided wave, and the vertical polarization combiner is connected to two ends of the second side arm guided wave.
In one embodiment of the utility model, the step structure is a step structure with gradually changing height deep into the intersection of the first side arm guided wave and the second side arm guided wave.
In one embodiment of the utility model, the horizontal polarization combiner includes a first rectangular waveguide port.
In one embodiment of the present invention, the direction of the first rectangular waveguide port is a radial direction of the coaxial waveguide.
In one embodiment of the utility model, the vertical polarization combiner includes a second rectangular waveguide port oriented in an opposite direction to the first rectangular waveguide port.
In one embodiment of the present invention, the horizontal polarization combiner and the vertical polarization combiner each include an H-plane curved waveguide, an E-plane curved waveguide, and a T-type combining waveguide.
In an embodiment of the present invention, the H-plane waveguide and the E-plane waveguide are a step-shaped 90-degree H-plane waveguide and a step-shaped 90-degree E-plane waveguide, respectively.
In one embodiment of the utility model, the coaxial waveguide comprises a coaxial waveguide port in guided wave communication with the first or second side arm.
In one embodiment of the present invention, the first side arm guided wave is a horizontally oriented side arm guided wave.
In one embodiment of the utility model, the second side arm guided wave is a vertically oriented side arm guided wave.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
the utility model discloses an orthogonal mode coupler OMT, which comprises: the cross center module, the horizontal polarization combiner and the vertical polarization combiner; the cross center module comprises a first side arm guided wave, a second side arm guided wave and a coaxial waveguide; the first side arm guided wave and the second side arm guided wave are arranged in a crossed and vertical mode; the coaxial waveguide is arranged at the intersection of the first side arm guided wave and the second side arm guided wave; a step structure for separating or synthesizing electromagnetic waves is arranged in the intersection of the first side arm guided wave and the second side arm guided wave; the horizontal polarization combiner is connected to two ends of the first side arm guided wave, and the vertical polarization combiner is connected to two ends of the second side arm guided wave. The utility model can realize the separation and synthesis of electromagnetic waves with different modes and restrain higher modes by arranging the stepped structure in the intersection of the first side arm guided wave and the second side arm guided wave, so that the orthogonal mode coupler has the characteristics of excellent electrical performance and convenient processing.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a coaxial waveguide OMT of asymmetric construction;
FIG. 2 is a coaxial waveguide OMT of symmetrical construction;
FIG. 3 is a block diagram of an orthogonal mode coupler OMT;
FIG. 4 is a block diagram of a cross center module;
fig. 5 is a structural view of a horizontal polarization combiner;
fig. 6 is a structural diagram of a vertical polarization combiner;
FIG. 7 is a schematic diagram of horizontally polarized electromagnetic wave reception;
FIG. 8 is a schematic diagram of vertically polarized electromagnetic wave reception;
FIG. 9 is a graph of the reflection coefficients of a first rectangular waveguide port and a second rectangular waveguide port;
fig. 10 is a schematic illustration of the isolation of a first rectangular waveguide port and a second rectangular waveguide port.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 3, the quadrature mode coupler OMT of the present invention includes: the cross center module, the horizontal polarization combiner and the vertical polarization combiner;
the cross center module comprises a first side arm guided wave, a second side arm guided wave and a coaxial waveguide;
the first side arm guided wave and the second side arm guided wave are arranged in a crossed and vertical mode, the first side arm guided wave is a side arm guided wave in the horizontal direction, and the second side arm guided wave is a side arm guided wave in the vertical direction;
the coaxial waveguide is arranged at the intersection of the first side arm guided wave and the second side arm guided wave, and comprises a coaxial waveguide port which is communicated with the first side arm guided wave or the second side arm guided wave;
a step structure for separating or synthesizing electromagnetic waves is arranged in the intersection of the first side arm guided wave and the second side arm guided wave, the step structure is a step structure with gradually changed height from the high to the low deep into the intersection of the first side arm guided wave and the second side arm guided wave, and as shown in fig. 4;
the horizontal polarization combiner is connected to two ends of the first side arm guided wave, and the vertical polarization combiner is connected to two ends of the second side arm guided wave;
the horizontal polarization combiner comprises a first rectangular waveguide port, and the direction of the first rectangular waveguide port is the radial direction of the coaxial waveguide, as shown in fig. 5; the vertical polarization combiner comprises a second rectangular waveguide port in an opposite direction to the first rectangular waveguide port, as shown in fig. 6;
the horizontal polarization combiner and the vertical polarization combiner respectively comprise an H-face curved waveguide, an E-face curved waveguide and a T-shaped combination waveguide, and the H-face curved waveguide and the E-face curved waveguide are respectively a step-shaped 90-degree H-face curved waveguide and a step-shaped 90-degree E-face curved waveguide.
In the coupler with the orthogonal mode, in the cross center structure, the highly-gradient stepped structure extending into the rectangular waveguide is adopted to realize the separation and synthesis of electromagnetic waves with different modes, and the structure has the characteristics of excellent electrical performance and convenience in processing. In the horizontal and vertical polarization combiner, the 90-degree H-plane curved waveguide, the 90-degree E-plane curved waveguide and the T-shaped combining waveguide are utilized, so that the port of the combined rectangular waveguide is in the radial direction of the coaxial waveguide instead of the axial direction of the coaxial waveguide, the layout of microwave/millimeter wave transceiver hardware is facilitated, and the system integration is facilitated.
Based on the above embodiments, the present embodiment further illustrates the working process of the quadrature mode coupler OMT;
the working process of the orthogonal mode coupler OMT is as follows: when a horizontally polarized TE11 mode electromagnetic wave signal is received from the coaxial waveguide port, the energy of the horizontally polarized electromagnetic wave is coupled equally to the side arm waveguide in the horizontal direction through the cross center structure, and then the two signals are synthesized through the horizontal polarization combiner, and finally output at the first rectangular waveguide port, as shown in fig. 7.
When a vertically polarized TE11 mode electromagnetic wave signal is received from the coaxial waveguide port, the energy of the vertically polarized electromagnetic wave is coupled equally to the vertically oriented side arm waveguide through the cross center structure, and then the two signals are synthesized through the vertical polarization combiner and finally output at the second rectangular waveguide port, as shown in fig. 8.
When the first rectangular waveguide port is excited, the TE10 mode electromagnetic wave is first equally divided by the combiner, then is combined into the horizontally polarized TE11 mode electromagnetic wave in the cross center structure, and is output through the coaxial waveguide port.
When the second rectangular waveguide port is excited, the TE10 mode electromagnetic wave is first equally divided by the combiner, and then is structurally combined into a vertically polarized TE11 mode electromagnetic wave in the cross center, and is output through the coaxial waveguide port.
The reflection coefficients and the isolation of the first rectangular waveguide port and the second rectangular waveguide port are shown in fig. 9 and 10, the horizontal axis of fig. 9 and 10 is frequency, the vertical axis is strength, and simulation results show that the reflection coefficients of the two ports are both smaller than-20 dB and the isolation of the two ports is larger than 45dB at 17.5-23.5 GHz, so that the rectangular waveguide fiber has excellent electrical performance.
The coupler in the orthogonal mode provided by the embodiment aims to solve the problems that the electrical performance is poor when the asymmetric structure coaxial waveguide OMT has a wider broadband and the symmetric structure coaxial waveguide OMT is inconvenient to process and the coaxial waveguide and the rectangular waveguide are in the same direction in the prior art.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. An OMT (orthogonal mode coupler) based on a coaxial waveguide, comprising: the cross center module, the horizontal polarization combiner and the vertical polarization combiner;
the cross center module comprises a first side arm guided wave, a second side arm guided wave and a coaxial waveguide;
the first side arm guided wave and the second side arm guided wave are arranged in a crossed and vertical mode;
the coaxial waveguide is arranged at the intersection of the first side arm guided wave and the second side arm guided wave;
a step structure for separating or synthesizing electromagnetic waves is arranged in the intersection of the first side arm guided wave and the second side arm guided wave;
the horizontal polarization combiner is connected to two ends of the first side arm guided wave, and the vertical polarization combiner is connected to two ends of the second side arm guided wave.
2. The OMT of claim 1, wherein the step structure is a step structure with a gradual change in height deep into the intersection of the guided waves of the first and second arms.
3. The OMT of claim 1, wherein the horizontal polarization combiner comprises a first rectangular waveguide port.
4. The OMT of claim 3, wherein the first rectangular waveguide port is oriented in a radial direction of the coaxial waveguide.
5. The OMT of claim 4, wherein the vertical polarization combiner comprises a second rectangular waveguide port oriented opposite to the first rectangular waveguide port.
6. The OMT of claim 1, wherein the horizontal polarization combiner and the vertical polarization combiner each comprise an H-plane curved waveguide, an E-plane curved waveguide, and a T-type combined waveguide.
7. The OMT of claim 6, wherein the H-plane waveguide and the E-plane waveguide are a stepped 90-degree H-plane waveguide and a stepped 90-degree E-plane waveguide, respectively.
8. The OMT of claim 1, wherein the coaxial waveguide comprises a coaxial waveguide port in guided wave communication with the first or second side arm.
9. The OMT of claim 1, wherein the first guided edge wave is a horizontally oriented guided edge wave.
10. The OMT of claim 1, wherein the second guided edge arm wave is a vertically oriented guided edge arm wave.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064856A (en) * | 2022-05-12 | 2022-09-16 | 中国电子科技集团公司第五十四研究所 | W-waveband self-tracking mode coupler |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064856A (en) * | 2022-05-12 | 2022-09-16 | 中国电子科技集团公司第五十四研究所 | W-waveband self-tracking mode coupler |
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