宽带双频双极化星载赋形反射面天线优化设计  

Optimal Design of Broadband Dual-frequency and Dual-polarized Shaped Reflector Antennas on Satellite

作　　者：张新刚[1] 吴刚[1] 钟鹰[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710100

出　　处：《电讯技术》2011年第7期142-146,共5页Telecommunication Engineering

摘　　要：为拓宽星载赋形反射面天线的工作带宽,运用物理光学(PO)、物理绕射理论(PTD)和极小极大值算法(Minimax)对其进行了设计。首先利用PO与PTD相结合的方法来计算天线远场,然后应用Minimax算法对目标函数进行优化来实现宽频带内的波束赋形。优化过程中同时考虑了天线的增益和带宽,并采用归一化的电场来进行构建目标函数,以消除评估站点设计增益对优化过程的影响,获得更好的优化结果。最后以一个服务区为美国国土、工作在Ku频段的双频双极化单偏置抛物反射面天线为例进行了仿真计算。数值仿真结果表明:当天线波束与服务区形状匹配并且增益满足设计要求时,其上、下行带宽都达到了1 000 MHz,具有良好的宽带性能。To broaden the bandwidth of shaped reflector antennas on satellite, the optimal design of this kind of antennas is addressed, which is based on Physical Optics（PO）, Physical Theory of Diffraction （PTD） and Minimax method. In the optimization process, a method combining PO and PTD is firstly used to calculate the far field and then the broadband contoured beam is realized by optimizing the objective function through Minimax method. The gain and the bandwidth are regarded as the optimization aims. In order to eliminate the influence of the design gain on the optimization process and get better result, normalized electric field is used to construct the target function. Finally, a dual - frequency and dual - polarized single offset reflector antenna at Ku - band is optimized to generate the contoured beam covering the America territory. The numerical simulation results show that both the up and down bandwidth are up to 1000 MHz.

关 键 词：星载天线 反射面天线 赋形波束 双频双极化 优化设计 

分 类 号：TN823.27[电子电信—信息与通信工程] TN820.88