Optimal design method of phased array feed source based on focal plane field sampling of reflector antenna

Abstract

The invention discloses an optimal design method of a phased array feed source based on focal plane field sampling of a reflector antenna, relates to a high-performance multi-beam antenna technology in the fields of communication, measurement and control, radio astronomy and the like, and aims to provide a phased array feed source design method which is high in efficiency, low in channel number and high in cost performance. According to the method, the characteristics of the focal plane field of the reflector antenna at different focal diameter ratios and different scanning angles are analyzed, the parameter selection principle of the phased array feed source during optimal sampling of the focal plane field is studied, the relation between the antenna aperture efficiency and the PAF design parameters is summarized, a relation curve of the optimal unit spacing of the phased array feed source and the focal diameter ratio is given, and the accuracy of the phased array feed source is improved. A calculation formula of the number of PAF units is exported, a PAF design example and performance analysis are given, and the effectiveness of the design method is verified. The method is suitable for the design of feed sources in the fields of radio astronomy, satellite communication, deep space exploration and the like.

Description

technical field [0001] The invention relates to a design method of a phased array feed source in the fields of communication, measurement and control, and radio astronomy, and more specifically, relates to the optimal design of the phased array feed source based on the sampling of the focal surface field of a reflector antenna. Background technique [0002] The reflector antenna equipped with a phased array feed (phased array feed, PAF) combines the advantages of high gain and low cost of the reflector antenna with the flexible beam scanning of the phased array antenna, and can form multiple beams with continuous coverage and excellent performance , effectively expand the field of view of the reflector antenna and improve the quality of the antenna system. The reflector antenna based on PAF feed has always been a research hotspot in the academic circle. [0003] In "Performance of a highly sensitive, 19-element, dual-polarization, cryogenic L-band phased-array feed on the G...

AI Technical Summary

Problems solved by technology

[0005] "Optimal number of elements and element spacing of wide-band focal plane arrays for a new generation radio telescope" published by Ivashina M V et al. is mainly aimed at reflector antennas with small focal-diameter ratios, and studies the element spacing and the number of elements of the PAF when the antenna efficiency is the highest. , and only consider the situation when the PAF is arranged in a square, the influence of the number of PAF units and the unit spacing on the performance of the reflector antenna is studied, and it is considered that when the number of units to synthesize a beam is 7×7 to 9×9, the aperture of the antenna The highest efficiency, but the number of units is too large, resulting in high cost of the back-end link

[0006] In the above studies, the element spacing of the PAF is generally determined by empirical values ​​or by the focal surface field formula and the Nyquist sampling theorem, and the parameters of the PAF are determined by calculating and comparing the performance of the reflector antenna when the PAF takes different parameters. Lack of systematic and in-depth research on the relationship between PAF array arrangement, element spacing, number of elements, focal-diameter ratio, scanning angle, and antenna aperture efficiency, and the selection principle of PAF parameters is not given, so it is difficult to guide the design of PAF

Therefore, in terms of design method, the design method of phased array feed based on reflector antenna focal surface field sampling still needs to be improved.

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