毫米波星载多频段多极化共馈天线系统  

Research on Millimeter Wave Space-Borne Antenna with Multiple Frequency and Dual Polarizations

作　　者：王宏建[1] 郝齐焱 刘世华[1,2] 易敏 陈雪[1] 刘广[1] 赵鑫[1] 

机构地区：[1]中国科学院空间科学与应用研究中心微波遥感技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《北京理工大学学报》2015年第3期290-293,298,共5页Transactions of Beijing Institute of Technology

摘　　要：天线工作频率为18.7,23.8GHz和37.0GHz,采用环加载波纹喇叭使工作带宽达到2倍,新型结构的超宽带正交模耦合器实现双极化信号的提取,微波多工器完成3个频段信号的有效分离.18.7GHz信号交叉极化电平和副瓣电平分别为-32.6,-21.0dB,23.8GHz信号交叉极化电平和副瓣电平分别为-31.6,-30.0dB,37.0GHz信号交叉极化电平和副瓣电平分别为-25.0,-30.0dB.仿真结果表明馈源系统适合星载天线设计,馈源结构更加紧凑,实能现对同一目标的多频率复用观测.Millimeter-wave space-borne antennas with multi-band and multi-polarization have many advances such as high gain,low side-lobe,high beam efficiency and low loss.The operating frequency of the antenna includes 18.7,23.8and 37.0GHz.The use of common feed system has significance for saving volume and enhancing structure stiffness.And the ring-loaded corrugated conical horn can cover octave bandwidth.The orthomode transducer（OMT）with new turnstile junction and frequency divider was employed to separate dual polarizations signals and then divide different frequencies into their own receivers,respectively.The cross polarization levels are-32.6,-31.6and-25.0dB in 18.7,23.8and 37.0GHz,respectively.The side lobe levels are-21,-30and-30 dB.Due to compact structure and multiple observations for one target,the simulation result demonstrates the design of feed system is suitable to space-borne antennas.

关 键 词：天线 环加载波纹喇叭 正交模耦合器 微波多工器 交叉极化 

分 类 号：TN828.5[电子电信—信息与通信工程]