馈源喇叭相位中心测量及误差分析

Measurement and Error Analysison Feed Horn Phase Center

简述了天线相位中心的基本概念,介绍了利用矢量网络分析仪测量馈源喇叭相位方向图的原理和方法程序,论述了由实测的相位方向图,通过对喇叭轴向的适当位移,来确定天线相位中心的一种常规方法,重点推导出由远场数学方程计算出馈源相心位置的实际调整量,快速确定相位中心的简单方法,并给出了C波段喇叭的测量实例,测量结果验证了理论分析的正确性。最后,分析了相位中心位置测量的误差,其均方根误差≤±1.69 mm。

The basic concept of the antenna phase center is described simply. The measuring principle and the procedure of feed horn phase pattern are introduced by using vector network analyzer. The simple method of determination phase center is discussed through adequate shift to the axis of horn by using measured phase patterns. A simple method of fast determining phase center is given by calculating actual adjusting size of feed phase center location by using the far field mathematics equation, and an measuring example of C band horn is given. The measurement results validate the correctness of theory analysis. At last, the measurement errors of phase center are analyzed, and it＇ s mean square error is less than or equal to ±1.69mm.