Fluid-solid electromagnetic three-field coupling calculation method of double-reflector antenna

Abstract

The invention discloses a fluid-solid electromagnetic three-field coupling calculation method for a double-reflector antenna, relates to the technical field of reflector antenna analysis, and aims toprovide a calculation method which is high in precision, free of conversion errors and high in practicability. The method mainly comprises the following steps: establishing a model and a computationaldomain in fluid field pretreatment software, importing an intermediate format file into the fluid field software, and solving to obtain a fluid field result; converting the format of the fluid fieldresult, importing the fluid field result into solid field software, establishing a relationship coupling unit in the solid field, and solving to obtain a solid field result; and performing interpolation processing on the solid field result in electromagnetic software to obtain an electromagnetic calculation model, and performing calculation to obtain a final electrical result. According to the method, fluid, solid and electromagnetic three-field coupling analysis is effectively integrated, and the method is particularly suitable for design, index budget and strength check of various reflectorantennas.

Description

technical field [0001] The invention relates to the technical field of reflector antenna analysis, and can be used for the calculation method of fluid, solid and electromagnetic three-field coupling of double reflector antennas such as Cassegrain and Gregory, and is especially suitable for the index budget and strength of double reflector antennas proofreading. Background technique [0002] Reflector antennas are widely used in the fields of communication, measurement and control, and radio astronomy because of their strong directivity. Due to the increased geometric parameters of the dual-reflector antenna, it is convenient to design more flexibly according to different requirements; a short-focus parabola can be used as the main reflector, which reduces the longitudinal size of the antenna; the secondary focus is closer to the receiving device, reducing transmission noise. Therefore, the double-reflector antenna occupies a very important position in the antenna field. ...

AI Technical Summary

Problems solved by technology

This method is only some preliminary performance estimation. For large-scale high-precision dual-reflector antennas, this method is too rough and cannot truly reflect the problem of fluid-solid electromagnetic coupling. It has the following defects:

As we all know, the flow field pressure is a vector value, and only scalar parameters are given in the textbook, which cannot reflect the direction of the force, which will lead to large deviations in the calculation results

[0007] (2) Antenna focal diameter ratio is single

[0008] (3) There is no antenna height value involved

[0009] (4) Lack of secondary reflector data

The data given in the textbook is only the main reflector of the antenna, and does not involve the wind flow field data of the secondary reflector in the double reflector antenna

[0010] (5) No other special-shaped reflector antennas are involved

The data provided in the book are only circular symmetric reflector antennas, and there is no experimental data involving bias antennas and other special-shaped antennas

[0011] (6) The calculation result has a large error

[0013] (1) Only a single field analysis

The above methods only provide a method for analyzing a single field of a solid field or a fluid field, and do not involve the relationship between multiple fields

[0014] (2) Does not consider the mutual influence of the positional relationship

The fluid calculation method involved does not consider the type of reflector antenna, such as the influence of the secondary reflector on the main reflector in the double reflector antenna, and does not consider the influence of the antenna mount

[0015] (3) Does not involve field coupling issues

For the fluid field, solid field and electromagnetic field problems involved in engineering, the above three methods have not given corresponding solutions

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