阵馈聚焦镜像双反射面有限扫描天线研究

文章分析了Ka波段阵馈聚焦镜像双反射面天线的构型及辐射特性，其通过聚焦椭球副面实现阵面口径到主反射面口径映射，得到了较大口径的等效相控阵。仿真表明等效阵单元方向图呈现良好的平头（Flat—top）特性，能较好地抑制栅瓣。文章基于等效阵元场叠加的概念，采用共轭场相位匹配结合泰勒幅度加权对远场方向图进行叠加，得到了高增益、低副瓣的扫描效果。

Array Fed Focusing Imaging Double Reflector Limited Scan Antenna

The configuration and radiation features of Ka band array-fed focusing imaging double reflector is presented in this paper. Through the conjugate function of ellipsoidal subreflector, the phased array aperture is mapped to the main paraboloidal aperture to obtain a larger aperture equivalent phased array. Simulations show that the element secondary field shaped like a ＂gate＂ with flat-top characteristics which can degrade grating lobe. Finally, the scanning beams have been achieved by combining CFM with Taylor circular aperture distribution based on the superstitions of array patterns, and the beam width and gain is superior to the same scale direct array.