Accurate cylindrical near-field measurements on large size conformal antennas

2017 IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2017-06-01 DOI:10.1109/METROAEROSPACE.2017.7999595

M. Angelilli, Flavio Auteri, L. Infante, Paolo Pacifici, G. Pellegrini

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引用次数: 1

Abstract

In this paper we describe the cylindrical near-field setup developed for the calibration and testing of large size conformai antenna. The antenna under test considered in this work is a not-rotating array used for SSR (Secondary Surveillance Radar) made by elementary radiators disposed along the 360° in the azimuthal plane producing fan-fixed beam along elevation plane. The electronic scanning is achieved by activating a proper subset of elementary radiators along the ground plane generating antenna patterns related to their individual phase centers generally not coincident with the near-field scanning coordinate system. The mechanical position errors of the antenna under test are increased due to the large dimensions and the payload. The alignment procedure presented here, allows a near-field cylindrical scanning close to the antenna phase center reducing the distortions that can affect the measurements. The improvement is seen in terms of accuracy of the transformed far-field antenna pattern.

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大尺寸共形天线的精确圆柱近场测量

本文介绍了为校准和测试大尺寸共形天线而研制的圆柱形近场装置。本文所考虑的天线是一种用于二次监视雷达(SSR)的非旋转天线阵，该天线阵是由在方位面沿360°布置的基本辐射体构成的，沿仰角面产生扇形固定波束。电子扫描是通过激活沿地平面的适当基本辐射体子集来实现的，产生与其单个相位中心相关的天线图案，通常与近场扫描坐标系不一致。被测天线由于尺寸大、载荷大，使得被测天线的机械位置误差增大。这里介绍的校准程序允许近场圆柱形扫描靠近天线相位中心，减少可能影响测量的畸变。改进体现在变换后的远场天线方向图的精度上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2017 IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace)

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