侧馈偏置卡塞格伦天线的波束扫描特性研究  

Beam scanning characteristics of side-feed offset cassegrain antenna

作　　者：于绪景 李建瀛[1] 张新刚[2] YU Xujing;LI Jianying;ZHANG Xingang(Northwestern Polytechnical University,Xi'an 710129,China;China Academy of Space Technology,Xi'an 710100,China)

机构地区：[1]西北工业大学,西安710129 [2]中国空间技术研究院西安分院,西安710100

出　　处：《电波科学学报》2019年第5期628-632,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61871324,61771404)

摘　　要：研究了侧馈偏置卡塞格伦(side-feed offset Cassegrain,SFOC)天线,针对SFOC天线的几何结构,讨论了结构参数的改变对天线辐射特性的影响,通过调整天线的设计参数实现天线波束的最佳扫描.对天线在不同扫描角度时的辐射方向图进行计算,分析了方向图的副瓣变化及天线波束扫描时天线增益的变化.仿真结果表明除了馈源被反射面遮挡的情况外,该SFOC天线在扫描过程中增益损失以及副瓣变化均较小,为星载天线的设计提供了参考.A side-feed offset Cassegrain (SFOC) antenna is studied. The influence of structural parameters on the radiation pattern of the antenna is discussed. The optimal beam scanning of the antenna is achieved by adjusting the antenna design parameters. The radiation pattern of the antenna at different scanning angles is calculated. The changes of the sidelobe level and antenna gain during beam scanning are analyzed. The simulation result shows that except for the case where the feed is blocked by the reflector, the gain loss and the sidelobe level variation of the SFOC antenna are small, which provides a reference for the design of the satellite antenna.

关 键 词：侧馈偏置卡塞格伦天线 方向图 波束扫描 最佳馈源位置 最佳馈源指向 

分 类 号：TN823.28[电子电信—信息与通信工程]