K波段喇叭天线增益的预测及外推法实测验证

内容简介：为了研究采用基于远场Friss公式建立起来的传统三天线法测量天线的增益时所引起的误差、有限测量距离误差修正值的误差情况，以及我国常用来验证测量结果时所采用的解析式的误差，该文针对K波段的标准增益喇叭天线的增益，分别采用三种解析式（Jull公式、Schelkunoff公式以及Rao公式）和两种数值计算方法（矩量法-MoM和时域有限积分法一FITD）来进行计算，并提供了外推法（又称为广义三天线法）实测结果来做比较分析。为了说明外推法法测量结果的准确性（u=0．04dB，k=2），在附录中简介了外推法的测量原理。分析结果表明，对于K波段喇叭天线而言，在用于验证传统三天线法的测量结果的准确性时，由解析式计算的天线增益“理论值”需要慎重；而采用全波分析方法并考虑了喇叭壁厚影响的计算结果则比较准确。

Abstract：The absolute gain measurement method is based on Friss formula in China up to now, and in order to study errors in gain measurement introduced by finite range, some formulas modification, and final results are validated by some theoretical value. The gain of a standard gain horn at K-band is predicted by three formulas and two numerical methods, re- spectively. The predictions are compared with the measurements by generalized three antenna method （ GTAM ）. Brief de- scription on GTAM is appended to show the accuracy of the measurement results. The study shows that the theoretical value is not accurate enough to validate the measurement results by traditional three antenna method; in contrast, the results by nu- merical method are more accurate than theoretical value.

作者：孟东林, 谢鸣, 李大博, 靳盛皓,

关键词：天线增益, 交叉极化, 三天线法, 外推法,