几何绕射理论在天线测量中的应用

Geometrical Diffraction for Antenna Measure

远场测量是大型天线常用的测量方法．但在用远场测量技术对天线的辐射特性进行测量时，地面反射波的干扰很大，影响测试数据的准确性。本文提出了一种用来消除地面反射波的新方法──金属挡屏几何绕射法。文中对金属屏边缘绕射效应进行了详细的分析．并用优化理论对参数ｈ和ｌ的进行优化取值，最后给出计算机优化程序的流程图。

ar-field measure is most measure method for large antennas. When the radiation characteristic is measured by far-field meauring technology. so large interfere of ground surface reflection. that it effect the accuracy of measuring datas. This paper advances a new method to eliminate the ground surface reflection-metal screen GTD method. The paper analyses metal screen edge diffraction effect,optimums parameter h and l in detail by optimumation theory.At last gives the flow diagram of computer optimumed program.