中文摘要：

该文介绍了焦面场的计算方法及其与反射面焦径比的关系,分析了焦面场与馈源口径场的联系,并建立了基于焦面场分析进行相控阵馈源设计的方法,包括确定单元间距、阵列规模以及实现目标方向图所需要的激励。按照这一方法,分别以未赋形卡塞格伦天线和前馈抛物面天线为对象,设计了各自的相控阵馈源以实现赋形波束的效果,并在后者上验证了波束扫描性能。通过仿真,天线性能实现了预定目标,证明了设计方法的有效性。

英文摘要：

A method of calculating focal field is introduced,and the connection between focal field,which depends on the reflector geometry,and the aperture field of feed is analyzed.Based on focal field distribution,a design method of phased array feed,including element spacing determination,phased array scale,and excitations for expected radiation pattern is presented.Two phased array feeds are designed to realize shaped beams for an un-shaped Cassegrain antenna and shaped scanning beams for a prime-focus parabolic antenna respectively.The numerical analyses demonstrate the effectiveness of the approach.