CN210379358U - High-power capacity slotted circular waveguide circular polarizer - Google Patents
High-power capacity slotted circular waveguide circular polarizer Download PDFInfo
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- CN210379358U CN210379358U CN201921804294.8U CN201921804294U CN210379358U CN 210379358 U CN210379358 U CN 210379358U CN 201921804294 U CN201921804294 U CN 201921804294U CN 210379358 U CN210379358 U CN 210379358U
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Abstract
The utility model discloses a high power capacity slotted circular waveguide circular polarizer, which relates to the technical field of microwave polarization conversion, overcomes the power capacity limitation caused by the appearance of medium induced triple points and mutation structures, has lower processing precision requirement, adopts overmoded circular waveguide, and has high power capacity performance; the compensation groove adopts a gradual change groove structure, generation of a high-order mode is inhibited, meanwhile, the overmoded circular waveguide is adopted, limitation of available bandwidth is avoided, the axial ratio and broadband performance are good, and broadband and miniaturization performance of the high-power circular polarizer are achieved.
Description
Technical Field
The utility model relates to a microwave polarization conversion technology field particularly, relates to a high power capacity fluting circular waveguide circular polarizer.
Background
In a microwave radiation system and a reflective antenna system, a circular polarizer is often required to convert a conventional linearly polarized microwave source signal into a circularly polarized signal, and then the circularly polarized signal is radiated by an antenna. The structural form of the circular polarizer directly determines the performance of a radiation system, such as power capacity, size, bandwidth and the like, and the conventional circular polarizer mainly comprises a screw circular polarizer, an iris circular polarizer, a metal stepped diaphragm circular polarizer, a dielectric diaphragm circular polarizer and a circular waveguide circular polarizer with a rectangular groove.
The screw circular polarizer and the iris circular polarizer respectively and equivalently adopt parallel capacitive susceptance and parallel inductive susceptance to electric fields parallel to and vertical to the screw or the iris, so that the corresponding electric field phases are delayed and advanced, and the conversion of circular polarized waves is realized; the metal stepped diaphragm circular polarizer takes each section of the stepped diaphragm as a section of ridge waveguide, adjusts the width and the length of the stepped diaphragm to correspondingly adjust the propagation constants of electromagnetic waves in two orthogonal directions, and realizes the conversion of double circular polarization, wherein the power capacity of the circular polarizer in vacuum is 53.8MW, and the axial ratio bandwidth of 1.5dB is 16%. The three types of circular polarizers are all inserted with small-size mutation structures, so that local field intensity concentration is easily caused, the power capacity is limited, and the application of GW-level high-power-capacity microwaves cannot be met; in addition, the performance of the circular polarizer has higher requirements on the processing precision of metal screws, irises and step clapboards.
The medium partition plate circular polarizer adjusts the structure and the length of a medium plate by utilizing the difference of equivalent dielectric constants in the direction vertical to and parallel to the medium partition plate so as to realize circular polarization conversion. The insertion of the dielectric partition plate structure inevitably introduces three-phase points, radio frequency breakdown easily occurs when the high-power microwave field is used, and the high-power microwave field is not suitable for the same. In addition, the dielectric partition plate is difficult to be accurately inserted into the corresponding position in the waveguide in practical application.
The circular waveguide circular polarizer with the rectangular groove realizes circular polarization conversion by forming a rectangular groove structure in the circular waveguide. However, since the rectangular slot has an abrupt structure, the rectangular slot is used in an over-mode circular waveguide with high power capacity to easily excite a high-order mode, and the performance such as the axial ratio and the bandwidth of the circular polarizer is affected. Meanwhile, the basic mode circular waveguide is adopted, so that the radius size of the circular waveguide is limited, and the power capacity of the circular waveguide is relatively small.
The circular polarizer available for high-power microwave at present is an elliptical waveguide circular polarizer [ Zhangzhiqiang, Fangying, Lijiawei, etc.. X-waveband high-power microwave TE11 mode circular polarizer [ J ]. intense laser and particle beams, 2011,23(07):1909 plus 1912 ], an input linear polarization TE11 mode is divided into two equal-amplitude orthogonal TE11 modes by using a transition section from the circular waveguide to the elliptical waveguide, the transmission coefficients of the two orthogonal components in the elliptical waveguide are different, and circular polarization conversion is realized by adjusting the length of the elliptical waveguide. Due to the adoption of the pure metal overmoded circular waveguide structure, the circular polarizer has high power capacity performance. However, since the length of the transition section from the circular waveguide to the elliptical waveguide determines the reflection coefficient and whether a high-order mode occurs, the ratio of the difference between the propagation constants in the two orthogonal directions to the major axis and the minor axis of the elliptical waveguide has a positive correlation, which requires a larger total length to achieve a phase difference of 90 ° and a low reflection coefficient, and the reported length of the X-band elliptical waveguide circular polarizer exceeds 300 mm.
With the development of microwave technology, the number of circular polarization systems carrying high-power microwaves is increasing, and circular polarizers are required to have high-power capacity and broadband performance, and meanwhile, a compact design is required to save system space, reduce shielding of microwaves and the like. Therefore, there is no circular polarizer that can satisfy high power capacity, miniaturization, and broadband performance at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high power capacity fluting circular waveguide circular polarizer, it can alleviate above-mentioned problem.
In order to alleviate the above-mentioned problem, the utility model discloses the technical scheme who takes as follows:
the utility model provides a high-power capacity slotted circular waveguide circular polarizer, which comprises a circular waveguide, wherein the circular waveguide is an overmoded circular waveguide; the inner wall of the circular waveguide is provided with a compensation groove, the compensation groove is arranged along the length direction of the circular waveguide and is a gradual change groove, the compensation groove comprises an arc groove surface and two flat groove surfaces respectively connected with two arc edges of the arc groove surface, and the connection part of the arc groove surface and the inner wall of the circular waveguide is of a chamfer structure.
The technical effect of the technical scheme is as follows: compared with the existing circular polarizer, the whole circular polarizer does not have small-size mutation structures such as media, metal screws, irises or stepped diaphragms, the power capacity limitation caused by the appearance of triple points caused by the media and mutation structures is overcome, the processing precision requirement is lower, and meanwhile, the overmoded circular waveguide is adopted, so that the circular polarizer has high power capacity performance; compared with the existing high-power circular polarizer, the compensation groove adopts a gradual change groove structure, generation of a high-order mode is inhibited, meanwhile, the overmoded circular waveguide is adopted, limitation of available bandwidth is avoided, the high-power circular polarizer has good axial ratio and broadband performance, and broadband and miniaturization performance of the high-power circular polarizer is realized.
Optionally, the arc-shaped groove surface is an elliptical arc-shaped or a regular arc-shaped gradual change groove.
The technical effect of the technical scheme is as follows: the elliptical arc-shaped and regular arc-shaped gradually-changed grooves are low in reflection, high in transmission efficiency, easy to process and low in requirement on processing precision.
Optionally, there are two compensation grooves, and the two compensation grooves are symmetrically arranged with respect to the central axis of the circular waveguide.
Optionally, the number of the compensation grooves is even, and the number of the compensation grooves is more than four, and the compensation grooves are symmetrically distributed relative to the central axis of the circular waveguide.
Optionally, there is one and only one compensation groove.
Optionally, the number of the compensation grooves is more than two, each compensation groove is arranged on the same straight line, and the compensation grooves are sequentially distributed along the length direction of the circular waveguide.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic perspective view of a high power capacity slotted circular waveguide circular polarizer according to an embodiment;
FIG. 2 is an axial cross-sectional schematic view of a high power capacity slotted circular waveguide circular polarizer according to an embodiment;
FIG. 3 is a schematic radial cross-sectional view of a high power capacity slotted circular waveguide circular polarizer according to an embodiment;
FIG. 4 is a graph of the main results of numerical simulation of the high power capacity slotted circular waveguide circular polarizer in the embodiment, wherein FIG. 4(a) is a graph of scattering coefficient at different frequencies, FIG. 4(b) is a graph of phase difference between two orthogonal components at different frequencies, FIG. 4(c) is a graph of axial ratio at different frequencies, and FIG. 4(d) is a graph of field intensity distribution of the circular polarizer;
FIG. 5 is a diagram illustrating an exemplary internal mode change process of the high power capacity slotted circular waveguide circular polarizer;
FIG. 6 is an axial cross-sectional view of an embodiment of a high power capacity slotted circular waveguide circular polarizer with six compensation slots;
FIG. 7 is an axial cross-sectional view of an embodiment of a high power capacity slotted circular waveguide circular polarizer with the compensation slot designed as one;
FIG. 8 is an axial cross-sectional view of an embodiment of a high power capacity slotted circular waveguide circular polarizer with three compensation slots;
in the figure: 1-circular waveguide, 2-compensation groove, 21-arc groove surface, 22-flat groove surface and 23-flat groove surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Examples
Referring to fig. 1 to 3, the present embodiment provides a high power capacity slotted circular waveguide circular polarizer, which includes a circular waveguide 1, which is an over-mode circular waveguide; the inner wall of the circular waveguide 1 is provided with two compensation grooves 2, and the two compensation grooves 2 are symmetrically arranged relative to the central axis of the circular waveguide 1; the compensation groove 2 is formed along the length direction of the circular waveguide 1 and is a gradual change groove, and compared with the mode change groove, the mode change groove structure adopted in the over-mode circular waveguide can avoid exciting a high-order mode, and the axial ratio performance of the circular polarizer is improved. The compensation groove 2 comprises an arc groove surface 21 and two flat groove surfaces 22 and 23 respectively connected with two arc edges of the arc groove surface, the connection part of the arc groove surface 21 and the inner wall of the circular waveguide 1 is a chamfer structure, and the chamfer structure is designed to have the characteristic of high power capacity.
The processing method of the high-power capacity slotted circular waveguide circular polarizer comprises the following steps:
s1, turning a metal column with the length of L into a cylindrical circular waveguide with the inner diameter of D by using the metal column as a raw material;
s2, cutting the circular waveguide along the axial center line position by using a wire cut electrical discharge machine to divide the circular waveguide into two tile-shaped symmetrical parts;
s3, milling compensation grooves on the inner walls of the two tile-shaped symmetrical parts by adopting a numerical control milling machine;
s4, welding the two tile-shaped symmetrical parts together and reconstructing a cylindrical circular waveguide;
and S5, polishing the outer wall of the circular waveguide by using polishing equipment.
The arc-shaped groove surface can be an elliptical arc-shaped or a regular arc-shaped gradual change groove, and in the embodiment, the elliptical gradual change groove is selected.
In the machining method, the wire cut electrical discharge machining is a non-contact machining mode by utilizing electric energy, and because the pulse discharge duration is short, the heat influence on the machined material is small, and the machining process, the dimensional accuracy and the form and position tolerance are low; the circular polarizer can realize electric sealing and air sealing simultaneously by a welding, turning and milling combined method, and the vacuumizing requirement of high-power microwave application is met.
In the embodiment, the circular waveguide is made of a metal material, the electric field breakdown threshold of the metal structure is high, the corresponding power capacity is high, and the circular waveguide is suitable for the high-power microwave field.
In this embodiment, a circular waveguide circular polarization model with an X-band open double-sided elliptical arc-shaped groove is shown in fig. 1 to 3, and the main size parameters are as follows: the waveguide diameter D is 27mm, the total length L of the circular polarizer is 91mm, the long semi-axis length a of the oval arc-shaped gradual change groove is 40mm, the short semi-axis length b is 20mm, and the groove width c is 13.5 mm.
The application method of the high-power capacity slotted circular waveguide circular polarizer in the embodiment comprises the following steps: TE with + 45-degree angle between the input of A port of circular waveguide and groove direction11Mode linear polarized wave EiAnd the right-hand circularly polarized wave is output at the other end, namely the port B, through the compensation groove.
In this example, the numerical simulation results obtained are as follows:
the scattering coefficients at different frequencies are shown in fig. 4(a), the transmission coefficients of the two orthogonal components are-3 dB, the reflection coefficient is lower than-24.3 dB, and no high-order mode exists in the waveguide; the phase difference result of two orthogonal components under different frequencies is shown in fig. 4(b), the phase difference of the two components is in the range of 90 degrees +/-20 degrees within the range of 8.4-12.4 GHz, the corresponding axial ratio result is shown in fig. 4(c), the axial ratio is less than 3dB, and the relative bandwidth is 38.5%. The results show that the circular polarizer has the performance of wide frequency band and low loss;
in this embodiment, when the center frequency is 10.4GHz and the input power is 0.5W, the electric field distribution of the circular polarizer is as shown in FIG. 4(d), and the maximum electric field intensity is 1425V/m, which appears on the same slot side as the polarization direction of the incident electric field Ei. The circular polarizer is generally applied to a high-power system under a vacuum pumping condition, the power capacity of the obtained circular polarizer is about 1.53GW according to the calculation that the field intensity breakdown threshold value is 80 MV/m, and the verification proves that the circular polarizer can be applied to the technical field of high-power microwave polarization conversion.
In this embodiment, the mode conversion process inside the entire circular polarizer is as shown in FIG. 5, and TE at an angle of +45 ° to the slot direction is input11Mode linear polarized wave EiCorresponding ExAnd EyTwo TE of direction11The mode component is always kept in an even mode, and the bilateral elliptical arc groove has a gradual change structure, so that the generation of a high-order mode is effectively inhibited, and the port B can be completely converted into an even mode TE11And (5) molding.
In addition to the above-described embodiments, the compensation grooves 2 can also be present in other numbers and in other distributions, for example as follows:
the number of the compensation grooves 2 may be even, and there are more than four compensation grooves 2, and the compensation grooves 2 are symmetrically distributed with respect to the central axis of the circular waveguide 1, for example, the number of the compensation grooves 2 shown in fig. 6 is six, and the double-sided groove distribution manner is adopted.
The compensating groove 2 can be designed as only one, as shown in fig. 7, which is a one-sided groove distribution.
The number of the compensation grooves 2 may be more than two, and each compensation groove 2 is arranged on the same straight line, and each compensation groove 2 is sequentially distributed along the length direction of the circular waveguide 1, for example, the number of the compensation grooves 2 shown in fig. 8 is three, and the one-sided groove arrangement mode is adopted.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high power capacity slotted circular waveguide circular polarizer comprises a circular waveguide and is characterized in that,
the circular waveguide is an over-mode circular waveguide; the inner wall of the circular waveguide is provided with a compensation groove, the compensation groove is arranged along the length direction of the circular waveguide and is a gradual change groove, the compensation groove comprises an arc groove surface and two flat groove surfaces respectively connected with two arc edges of the arc groove surface, and the connection part of the arc groove surface and the inner wall of the circular waveguide is of a chamfer structure.
2. The high power capacity slotted circular waveguide circular polarizer of claim 1 wherein the arcuate slot surface is a tapered slot of an elliptical or right circular arc.
3. The high power capacity slotted circular waveguide circular polarizer of claim 2, wherein there are two of the compensation slots, the two compensation slots being symmetrically disposed with respect to a central axis of the circular waveguide.
4. The high power capacity slotted circular waveguide circular polarizer of claim 2 wherein the number of the compensation slots is an even number and is more than four, and the compensation slots are symmetrically distributed with respect to the central axis of the circular waveguide.
5. The high power capacity slotted circular waveguide circular polarizer of claim 2 wherein there is one and only one compensation slot.
6. The high power capacity slotted circular waveguide circular polarizer of claim 2, wherein the number of the compensation slots is two or more, each compensation slot is disposed on a same straight line, and each compensation slot is sequentially distributed along the length direction of the circular waveguide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921804294.8U CN210379358U (en) | 2019-10-24 | 2019-10-24 | High-power capacity slotted circular waveguide circular polarizer |
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| CN201921804294.8U CN210379358U (en) | 2019-10-24 | 2019-10-24 | High-power capacity slotted circular waveguide circular polarizer |
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| CN210379358U true CN210379358U (en) | 2020-04-21 |
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