宽角扫描侧馈偏置卡塞格伦天线的优化设计  

Optimal design of side-fed offset cassegrain dual reflector antennas for wide-angle scanning

作　　者：刘少东[1] 焦永昌[1] 张福顺[1] 

机构地区：[1]西安电子科技大学天线与微波技术国家重点实验室,陕西西安710071

出　　处：《电波科学学报》2004年第6期713-716,共4页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目 (6 0 1710 4 5 );教育部优秀青年教师资助计划项目;天线与微波技术重点实验室基金项目

摘　　要：为满足星载天线空间电扫描的要求 ,研究了宽角扫描侧馈偏置卡塞格伦天线 (SFOC)的设计问题。给出了SFOC天线的结构形式 ,通过射线追踪的方法对SFOC的最佳馈源位置和最佳馈源指向进行了优化设计。二者的确定不仅改善了SFOC天线系统的扫描特性 ,而且提高了它的工程可实现性。分析结果表明 ,该SFOC天线在宽角扫描过程中 ,方向图畸变很小 ,增益损失和副瓣电平均达到了设计要求 ,从而为全球扫描星载天线的设计提供了有效的方案。In order to meet global scanning requirements of the satellite antenna, a side-fed offset Cassegrain (SFOC) antenna is designed in this paper. The structure of the SFOC antenna is constructed, and the optimum-feed position (OFF) and the optimum-feed direction (OFD) are analyzed by using the ray tracing method and the optimization method. The OFF and OFD can not only improve the wide-angle scanning ability of the antenna, but also increase the engineering feasibility of the SFOC antenna system. The simulation results indicate that the patterns of SFOC antenna in the wide-angle scanning region have less distortion, and both the gain loss and the sidelobe level may meet the design specifications.

关 键 词：星载天线 电扫描 射线追踪 最佳馈源位置 最佳馈源指向 

分 类 号：TN821[电子电信—信息与通信工程]