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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-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。
In order to study the errors caused by using the traditional three-antenna method to measure the gain of the antenna based on the far-field Friss formula, the error of the finite measurement error correction and the analytical error commonly used to verify the measurement results in our country In this paper, we use three analytic formulas (Jull formula, Schelkunoff formula and Rao formula) and two numerical methods (Moment Method-MoM and Time Domain Finite Integral Method-FITD respectively for the gain of K-band standard gain horn antenna) ) To calculate, and provides extrapolation method (also known as generalized three antenna method) to do the comparative analysis of the measured results. To illustrate the accuracy of the extrapolated method (U = 0.04dB, k = 2), the principle of extrapolation is introduced in the appendix. The analysis results show that for the K-band horn antenna, the antenna gain “theoretical value” calculated by the analytical formula needs to be cautious when used to verify the accuracy of the measurement result of the traditional three-antenna method; and the full-wave analysis method Considering the influence of horn wall thickness, the calculation result is more accurate.