天线平面近场测量中截断误差仿真分析

Simulation analysis of truncation error in antenna planar near-field measurement

为了分析天线平面近场测量中截断角对测量结果的影响,以半波阵子组成的阵列天线为分析模型,分别针对法向波束和扫描波束进行数值计算,研究了截断误差对天线平面近场测量结果的影响.通过对比数值计算结果与理论值,分析了不同条件下远场方向图的平均副瓣、第一副瓣受截断角的影响;并给出了不确定度,即确定天线远场方向图的误差数量级.该研究为实际天线平面近场测量提供了参考.

In order to analyze the influence of truncation angle on the measurement results in the antenna planar near-field measurement,this paper takes the array antenna composed of half wave dipoles as the analysis model to carry out the numerical calculation for the normal beam and scanning beam respectively,studying the influence of truncation error on the antenna planar near-field measurement results.And then,by comparing the numerical calculation results with the theoretical values,the paper analyzes the influence of the truncation angle on the average sidelobe and the first sidelobe of the far-field pattern under different conditions,and also gives the uncertainty,i.e.the error order of antenna far-field pattern is determined.This research provides a reference for the planar near-field measurement of practical antenna.