Ultra-wideband multimode horn and design method thereof
A design method and ultra-broadband technology, applied in waveguide speakers, computing, special data processing applications, etc., can solve the problems of small reflection coefficient at the input port of the speaker, unequal direction diagram, and unsatisfactory cross-polarization performance, etc., and achieve good performance. Equalization, Effect of Small Reflection Coefficient
Active Publication Date: 2019-05-10
CHINA ELECTRONICS TECH GRP NO 39 RES INST
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Problems solved by technology
[0003] In order to solve the problems of unequal pattern and unsatisfactory cross-polarization performance of the existing speakers in the wide frequency band, the present invention proposes an ultra-wideband multi-mode speaker and its design method, starting from the circular waveguide step discontinuity, and applying the mode matching method Combined with the optimization algorithm and the simulation process, the high-order mode generated by discontinuity is used to make the horn mouth produce a suitable mode ratio in the ultra-wide frequency band, so that the pattern can be well equalized in the ultra-wide frequency band, and the horn input port has a relatively high frequency. small reflection coefficient
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[0033] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0034] In this embodiment, it is a multi-mode feed source of a large-diameter antenna in a certain place in my country. The design goal is: the working frequency range is 4-12GHz, the irradiation angle is 11 degrees, the irradiation level is ≤-10dB, the return loss is ≥25dB, and the speaker is within the design bandwidth. The amplitude equalization of the pattern is better than 1dB.
[0035] The ultra-wideband multimode horn includes an input circular waveguide, a discontinuous structure between the horn input waveguide aperture and the horn output aperture, and a straight waveguide part that radiates to space. The input circular waveguide is a straight waveguide with a free length. According to the ultra-wideband The required frequency ...
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The present invention provides an ultra-wideband multimode horn and a design method thereof. The horn comprises an input circular waveguide, a discontinuous structure between the horn input waveguideaperture and the horn output aperture, and a straight waveguide portion radiating to the space. The input circular waveguide is a straight waveguide with a free length, and the input aperture is determined according to the required frequency band and the transmission mode of the ultra-wideband multimode horn; the discontinuous structure is composed of a plurality of circular waveguide steps, and the discontinuity of the steps can be used to generate different transmission modes; and the straight waveguide portion radiating to the space is a straight waveguide with a free length, and the outputaperture is selected according to the illumination level requirement. According to the technical scheme of the present invention, starting from the discontinuity of the circular waveguide steps, themode matching method combined with the optimization algorithm and the simulation process are used, the discontinuously generated high-order modes are used, and a suitable mode ratio is generated in the ultra-wide frequency band, so that good equalization of the directional diagram is achieved in the ultra-wide frequency band, and the horn input port has a small reflection coefficient.
Description
technical field [0001] The invention relates to the technical field of electromagnetic fields and microwaves, in particular to an ultra-broadband multimode horn and a design method. Background technique [0002] Modern measurement and control communications, astronomical observation, and remote sensing industries have put forward wider and wider operating frequency band requirements for microwave antennas, especially for radio astronomy observation antennas. The design of broadband feeds can make the system design more compact. The number of feeds and back-end equipment greatly reduced. Existing conventional multi-mode horns and corrugated horns have unsatisfactory pattern equalization performance and cross-polarization performance in a wide frequency band. Contents of the invention [0003] In order to solve the problems of unequal pattern and unsatisfactory cross-polarization performance of the existing speakers in the wide frequency band, the present invention proposes...
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IPC IPC(8): H01Q13/02H01Q1/36G06F17/50
Inventor 张宇
Owner CHINA ELECTRONICS TECH GRP NO 39 RES INST