天线阵元相位中心的一种测量方法

A Measurement Method for Phase Center of Antenna Array Element

分析天线阵元相位差与其相位中心的数学关系,建立了阵元相位中心的目标函数模型。基于实际的天线阵列测试系统对对数周期天线阵元相位中心进行测量,并利用最小二乘法求出阵元实际相位中心。分析比较了实测与理论的相位中心差异,结果表明:在大部分工作频率上实测结果与理论计算结果较一致,但在高频实测相位中心比理论相位中心更靠近馈电点;实际测量的相位中心能够有效地表征各阵元间实际相位关系。

This paper analyzes the mathematical relationship between phase difference and phase center of antenna array element, sets up a target function model of phase center of antenna array el- ement,measures the phase center of log-periodic antenna array element based on practical antenna array measurement system, gains the practical phase center of the array element by least square method,analyzes and compares the difference between the phase center measured practically and theoretical phase center, and the result shows.the measured phase center is consistent with theoretical phase center at most of working frequency,however,at high frequency,it is nearer to the feed- ing position than theoretical phase center,the measured phase center can effectively denote the ac- tual phase relationships among the elements in antenna array.