CN115621696A - Millimeter wave orthogonal mode coupler with simple structure - Google Patents
Millimeter wave orthogonal mode coupler with simple structure Download PDFInfo
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- CN115621696A CN115621696A CN202211144532.3A CN202211144532A CN115621696A CN 115621696 A CN115621696 A CN 115621696A CN 202211144532 A CN202211144532 A CN 202211144532A CN 115621696 A CN115621696 A CN 115621696A
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- output port
- circular waveguide
- transmission section
- polarized
- waveguide transmission
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Abstract
The invention discloses a millimeter wave orthogonal mode coupler with a simple structure, which comprises a circular waveguide transmission section, wherein one end of the circular waveguide transmission section is provided with a common input port; the other end of the circular waveguide transmission section is provided with a circular waveguide short-circuit surface, a polarized waveguide branch is arranged on the circular waveguide transmission section, and the polarized waveguide branch comprises a first polarized output port and a second polarized output port; and a metal probe is arranged in the circular waveguide transmission section. The invention adds the metal probe on the basis of the structure of the existing orthogonal mode coupler, expands the working bandwidth of millimeter wave signal transmission by the metal probe, and effectively improves the isolation of two output ports; meanwhile, the whole structure has the characteristics of relative simplicity and compactness, convenient application, excellent performance and the like.
Description
Technical Field
The invention relates to the technical field of radar antennas, in particular to a millimeter wave orthogonal mode coupler with a simple structure.
Background
With the progress of the technical level of millimeter waves, the technology of the millimeter wave cloud measuring radar is rapidly developed, and the dual-polarization Doppler rain measuring and cloud measuring radar developed at home and abroad currently covers the Ku wave band, the Ka wave band, the W wave band and the like; the millimeter wave orthogonal mode coupler is an important component;
fig. 5 shows a conventional millimeter wave orthomode coupler, which has the following disadvantages: the existing millimeter wave orthogonal mode coupler has small structural size, so that some structural designs need to be removed in order to ensure effective manufacturing and processing, and the working bandwidth of the existing millimeter wave orthogonal mode coupler is narrow in the application process; and the isolation between the two polarized output ports is poor.
Disclosure of Invention
In order to overcome the above technical problems, the present invention aims to provide a millimeter wave orthogonal mode coupler with a simple structure.
The purpose of the invention can be realized by the following technical scheme:
a millimeter wave orthogonal mode coupler with a simple structure comprises a circular waveguide transmission section, wherein a public input port is arranged at one end of the circular waveguide transmission section; the other end of the circular waveguide transmission section is provided with a circular waveguide short-circuit surface, a polarized waveguide branch is arranged on the circular waveguide transmission section and comprises a first polarized output port and a second polarized output port, and the first polarized output port and the second polarized output port are both arranged on the circular waveguide transmission section; the distance between the second polarization output port and the circular waveguide short-circuit surface is a quarter of the waveguide wavelength, and the second polarization output port and the first polarization output port are in mutually vertical positions; the circular waveguide transmission section is internally provided with a metal probe, the metal probe is positioned on a central line of the circular waveguide transmission section and between the first polarization output port and the second polarization output port, and the directions of the metal probe and the second polarization output port are consistent.
As a further scheme of the invention: the first polarization output port is connected with a first transition matching section, the first polarization output port is connected with the circular waveguide transmission section through the first transition matching section, the second polarization output port is connected with a second transition matching section, and the second polarization output port is connected with the circular waveguide transmission section through the second transition matching section.
As a further scheme of the invention: the first polarized output port and the second polarized output port are both rectangular ports.
As a further scheme of the invention: the distance between the first polarized output port and the second polarized output port is a multiple of one-half of the waveguide wavelength.
As a further scheme of the invention: the second polarization output port and the first polarization output port are perpendicular to the circular waveguide transmission section.
As a further scheme of the invention: the circular waveguide transmission section is provided with through holes in pairs, and the metal probe is inserted between the two through holes.
As a further scheme of the invention: the distance between the second polarization output port and the circular waveguide short-circuit surface is one quarter of the waveguide wavelength.
As a further scheme of the invention: the distance between the second polarized output port and the common input port is greater than the distance between the first polarized output port and the common input port.
The invention has the beneficial effects that:
the invention adds the metal probe on the basis of the structure of the existing orthogonal mode coupler, expands the working bandwidth of millimeter wave signal transmission by the metal probe, and effectively improves the isolation of two output ports; the whole structure has the characteristics of relative simplicity, compactness, convenient application, excellent performance and the like.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a top view of the relative position distribution of the metal probe and the second polarization output port in the present invention;
FIG. 3 is a graph of the output port echo reflection coefficient and port isolation for a metal-free probe application of the present invention;
FIG. 4 is a graph of the output port echo reflection coefficient and port isolation for a metal probe application of the present invention;
fig. 5 is a schematic structural diagram of a conventional millimeter wave orthogonal mode coupler.
In the figure: 1. a circular waveguide transmission section; 2. a common input port; 3. a first polarized output port; 4. a first transition matching section; 5. a second polarized output port; 6. perforating; 7. a metal probe; 8. a first transition matching section; 9. a circular waveguide transmission member; 10. a first output port; 11. an output port II; 12. circular waveguide short-circuit surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 5, the conventional millimeter wave orthogonal mode coupler includes a circular waveguide transmission member 9, the circular waveguide transmission member 9 is provided with a first output port 10 and a second output port 11, one end of the circular waveguide transmission member 9 is an input end, the input end is convenient for millimeter wave input, and then corresponding polarization signals are output through the first output port 10 and the second output port 11 respectively.
As shown in fig. 1-2, a millimeter wave orthomode coupler with a simple structure includes a circular waveguide transmission section 1, the size of the circular waveguide transmission section 1 is calculated and determined according to the working mode of the Ka-band circular waveguide and the working frequency calculation formula of the TE11 mode, the radius of the circular waveguide transmission section 1 is 2.8mm, the wall thickness of the circular waveguide transmission section is 1.2mm, one end of the circular waveguide transmission section 1 is provided with a common input port 2, and the common input port 2 is used for waveguide signal input; the other end of the circular waveguide transmission section 1 is provided with a circular waveguide short-circuit surface 12, a polarized waveguide branch is arranged on the circular waveguide transmission section 1 and comprises a first polarized output port 3 and a second polarized output port 5, the port sizes of the first polarized output port 3 and the second polarized output port 5 are both 7.112mm x 3.556mm, the first polarized output port 3 and the second polarized output port 5 are both arranged on the circular waveguide transmission section 1, the first polarized output port 3 is connected with a first transition matching section 4, the first polarized output port 3 is connected with the circular waveguide transmission section 1 through the first transition matching section 4, the second polarized output port 5 is connected with a second transition matching section 8, the second polarized output port 5 is connected with the circular waveguide transmission section 1 through the second transition matching section 8, and the first transition matching section 4 and the second transition matching section 8 are both used for ensuring good standing wave characteristics of the output ports; the first polarization output port 3 and the second polarization output port 5 are both rectangular ports, the second polarization output port 5 is positioned on one side far away from the common input port 2, namely the distance between the second polarization output port 5 and the common input port 2 is greater than the distance between the first polarization output port 3 and the common input port 2, the distance between the second polarization output port 5 and the circular waveguide short-circuit surface 12 is a quarter of the waveguide wavelength, the distance between the first polarization output port 3 and the second polarization output port 5 is a multiple of one-half of the waveguide wavelength, the actual multiple is determined according to the length of the circular waveguide transmission section 1, the second polarization output port 5 and the first polarization output port 3 are positioned in a mutually vertical position, and the second polarization output port 5 and the first polarization output port 3 are both vertical to the circular waveguide transmission section 1;
a metal probe 7 is arranged in the circular waveguide transmission section 1, through holes 6 are formed in the circular waveguide transmission section 1 in pairs, the metal probe 7 penetrates between the two through holes 6, when the metal probe 7 is installed, the metal probe 7 penetrates into the through holes 6, then end welding and fixing can be carried out, the metal probe 7 is prevented from being separated, the metal probe 7 is located on the central line of the circular waveguide transmission section 1 and located between the first polarization output port 3 and the second polarization output port 5, meanwhile, the directions of the metal probe 7 and the second polarization output port 5 are consistent, and namely the central axis of the metal probe 7 is parallel to the central line of the second polarization output port 5;
FIG. 3 is a graph of the echo reflection coefficient and port isolation of the output port without the metal probe 7;
fig. 4 is a graph of the echo reflection coefficient of the output port and the port isolation degree of the metal probe 7, so that as can be seen from fig. 3 and 4, the metal probe 7 can effectively increase the operating bandwidth of waveguide signal transmission, and the isolation degree between the first polarization output port 3 and the second polarization output port 5 is improved.
The working principle of the invention is as follows: waveguide signals enter the circular waveguide transmission section 1 through the public input port 2 and are output through the first polarization output port 3 and the second polarization output port 5 respectively, in the output process, the signals pass through the metal probe 7, the working bandwidth of signal transmission is increased by means of the metal probe 7, and meanwhile the isolation between the first polarization output port 3 and the second polarization output port 5 is effectively improved.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A millimeter wave orthogonal mode coupler with a simple structure comprises a circular waveguide transmission section (1), wherein a common input port (2) is arranged at one end of the circular waveguide transmission section (1); the other end of the circular waveguide transmission section (1) is provided with a circular waveguide short-circuit surface (12), a polarized waveguide branch is arranged on the circular waveguide transmission section (1), the polarized waveguide branch comprises a first polarized output port (3) and a second polarized output port (5), and the first polarized output port (3) and the second polarized output port (5) are both arranged on the circular waveguide transmission section (1); the second polarized output port (5) and the first polarized output port (3) are in mutually perpendicular positions; the circular waveguide transmission section is characterized in that a metal probe (7) is arranged inside the circular waveguide transmission section (1), the metal probe (7) is located on the central line of the circular waveguide transmission section (1) and between the first polarization output port (3) and the second polarization output port (5), and the directions of the metal probe (7) and the second polarization output port (5) are consistent.
2. The millimeter wave orthogonal mode coupler with simple structure according to claim 1, wherein a first transition matching section (4) is connected to the first polarization output port (3), the first polarization output port (3) is connected to the circular waveguide transmission section (1) through the first transition matching section (4), a second transition matching section (8) is connected to the second polarization output port (5), and the second polarization output port (5) is connected to the circular waveguide transmission section (1) through the second transition matching section (8).
3. A structurally simple millimeter wave orthomode coupler according to claim 1, wherein the first polarized output port (3) and the second polarized output port (5) are both rectangular ports.
4. A structurally simple millimeter wave orthomode coupler according to claim 1, characterized in that the distance between the first polarized output port (3) and the second polarized output port (5) is a multiple of one half of the waveguide wavelength.
5. A structurally simple millimeter wave orthomode coupler according to claim 1, characterized in that the second polarized output port (5) and the first polarized output port (3) are perpendicular to the circular waveguide transmission section (1).
6. The millimeter wave orthogonal mode coupler with the simple structure according to claim 1, wherein the circular waveguide transmission section (1) is provided with through holes (6) in pairs, and the metal probe (7) is inserted between the two through holes (6).
7. A structurally simple millimeter wave orthomode coupler according to claim 1, wherein the distance between the second polarized output port (5) and the circular waveguide short-circuiting surface (12) is a quarter of a waveguide wavelength.
8. A structurally simple millimeter wave orthomode coupler according to claim 1, characterized in that the distance between the second polarized output port (5) and the common input port (2) is larger than the distance between the first polarized output port (3) and the common input port (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211144532.3A CN115621696A (en) | 2022-09-20 | 2022-09-20 | Millimeter wave orthogonal mode coupler with simple structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211144532.3A CN115621696A (en) | 2022-09-20 | 2022-09-20 | Millimeter wave orthogonal mode coupler with simple structure |
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| Publication Number | Publication Date |
|---|---|
| CN115621696A true CN115621696A (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211144532.3A Pending CN115621696A (en) | 2022-09-20 | 2022-09-20 | Millimeter wave orthogonal mode coupler with simple structure |
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| CN (1) | CN115621696A (en) |
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- 2022-09-20 CN CN202211144532.3A patent/CN115621696A/en active Pending
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