X/Ka双频段宽带极化扭转卡塞格伦天线设计  

Design of X/Ka Dual-band and Wide Band Polarization-reversed Cassegrain Antenna

作　　者：马世娟 王建[1] 李敏[1] 刘华涛[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《现代雷达》2015年第11期64-68,80,共6页Modern Radar

摘　　要：针对标准卡塞格伦天线因馈源口径、副反射面以及支杆遮挡而导致的增益较低和副瓣电平较高的问题,文中设计了一种极化扭转变形卡塞格伦天线,通过副反射面的波选择功能、主反射面的90°极化扭转功能最大限度地降低了副反射面及支杆的遮挡效应。针对主、副反射面结构复杂的情况,采用等效介电常数的方法简化仿真模型。首先,利用电磁仿真软件CST对副反射面的反射率和透射率、主反射面的极化扭转特性进行仿真分析。然后,利用电磁仿真软件FEKO对天线主、副反射面进行总体设计仿真优化分析。最后,实测的天线工作绝对带宽为2 GHz,上、下边频以及中心频点和方向图的副瓣均小于-20 d B,且实测结果与理论计算及FEKO仿真结果较为一致。In order to solve low mainlobe gain and high sidelobe gain of the standard Cassegrain antenna ~ which is introduced by the feed aperture, vice-reflector and strut shielding effect ~ a polarization-reversion and deformational Cassegrain antenna is proposed in this paper. The shielding effect of vice-reflector and strut is greatly reduced by the polarization selection of the vice-reflector and polarization-reversed of main-reflector. Based on the effective permittivity method, a simple simulation model is established to re- duce the structure of the main-reflector and vice-reflector. The reflectivity and transmittance of vice-reflector and polarization-re- versed rate of main-reflector are analyzed by the electromagnetic simulation software CST. The design of main-reflector and vice-re- flector are analyzed and optimized by the electromagnetic simulation software FEKO. Compared with the results of theoretical calcu- lation and simulation, the test results of the designed polarization-reversed Cassegrain antenna has a similar performance that the bandwidth is 2 GHz, and the sidelohe level of sum oattern is below -20 dB.

关 键 词：双频段 宽频带 极化扭转 卡塞格伦天线 

分 类 号：TN823.28[电子电信—信息与通信工程]