针对卫星通信领域对于反射面天线多频复用的需求,提出了一种X/ Ka 双频共用同轴馈源的优化设计方法,馈源采用同轴嵌套的结构形式,X 频段采用同轴波导馈电喇叭,Ka 频段采用介质加载的圆波导馈电喇叭。基于旋转体时域有限差分法和差分进化算法对双频同轴馈源进行了优化设计,并将馈源与网络器件级联优化得到了X/ Ka 双频馈源网络系统。馈源样机测试结果表明,该馈源系统具有良好的传输与辐射特性,满足工程应用要求。

According to the requirements of multi band multiplexing of reflector antenna in the field of satellite communication, a design of X/ Ka dual band coaxial feed is proposed. The feed adopts the structure of coaxial nesting. Coaxial waveguide feed horn is used in X-band and dielectric loaded circular waveguide feed horn is used in Ka band. Based on the body of revolution finite difference time domain method and differential evolution algorithm, the coaxial feed is quickly optimized, and the X/ Ka dual band feed network system is obtained by cascading the feed and network devices. The test results show that the feed network system has good transmission and radiation characteristics and meets the requirements of engineering application.

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