卡式天线中双口双模馈源设计  

The design of dual-aperture dual-mode feed of cassegrin

作　　者：马世娟 王建[1] 郑贵[1] 司海峰[1] 刘华涛[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《电子设计工程》2016年第12期73-76,共4页Electronic Design Engineering

摘　　要：基于卡塞格伦天线对馈源工作带宽的要求,设计了一种Ka波段双口双模馈源。首先,对双口双模口径场进行理论分析并借助MATLAB编程作图。然后,对馈源进行建模仿真,通过加入匹配金属圆柱销钉、在波导窄边加入过渡阶梯、在H臂末端宽边处加入过渡台阶的方法使H折叠魔T的工作绝对带宽可达7 GHz。最后,进行实测,工作绝对带宽为2 GHz,S和口、E差口和H差口驻波比均小于2,3个端口间的隔离度均大于25 d B,仿真与实测结果吻合。In order to meet the requirements to feed in Cassegrain antenna, the title proposed an Ka-band dual-port dual-mode feed for Cassegrin antenna system. Firstly, analysis the theory and plot using MATLAB of the dual-port dual-mode diameter field. Secondly, simulate the model, An matching metal cylinder pins, Transitional steps at the narrow waveguide and at the end of H-arm are used to improve the performance of H floded magic T. Lastly, test results show that the VSWR of S summation port, S differencing port and H differencing port are all below 2, the isolation among these three ports are all larger than 25 d B in the bandwidth of absolute 2 GHz. The simulation and test results are similar.

关 键 词：馈源 双口双模 KA波段 宽带 

分 类 号：TN819.1[电子电信—信息与通信工程]