低旁瓣小口径天线口面场分布函数的研究  

Study of Field Distribution Function for Small Aperture Antenna with Low Side Lobes

作　　者：刘兴隆[1] 杜彪[1] 周建寨[1] 解磊[1,2] 邵国媛 LIU Xinglong;DU Biao;ZHOU Jianzhai;XIE Lei;SHAO Guoyuan(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Notional Key Laboratory of Antenna and Microwave Technology,Xidian University,Xi’an 710071,China;North Automatic Control Technology Institute,Taiyuan 030006,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]西安电子科技大学天线与微波技术重点实验室,陕西西安710071 [3]北方自动控制技术研究所,山西太原030006

出　　处：《无线电通信技术》2019年第4期425-430,共6页Radio Communications Technology

基　　金：河北省应用基础研究计划重点研究项目(16960404D)

摘　　要：小口径反射面天线主反射面电尺寸较小、副反射面遮挡较大,经典的口面场分布函数已经不再适用于小口径天线的赋形设计。针对0.9 m Ku频段天线低旁瓣、高效率的要求,用多目标遗传算法优化了其口面场分布。经几何光学赋形设计,利用Grasp软件计算了该天线的辐射性能,在Ku收发频段的口面效率可达60%以上,第一旁瓣低于-18 dB,并且±20°范围内的广角旁瓣满足INTELSAT IESS-601要求。利用一种二阶贝赛尔函数描述了该类口面场分布,分析了小口径天线口面各区域的能量分布对其效率和旁瓣的影响。Classical aperture field distribution functions are not appropriate for the design of small aperture reflector antenna with a larger sub-reflector blockage.An aperture field distribution function is optimized by multi-object genetic algorithm,satisfying the requirement of low side lobes and high efficiency for 0.9 m Ku band antenna.A 0.9 m ring-focus antenna is designed by the optimized aperture field distribution function,and the calculated radiation patterns by Grasp software show that the aperture efficiency is higher than 60%,the first side-lobe level is less than-18 dB and the side-lobe peaks satisfy INTELSAT IESS-601 between-20°and 20°.A Bessel function is proposed to represent the optimized aperture field distribution function,and the effect of aperture field distribution functions on side lobes and efficiency is studied for small aperture antenna.

关 键 词：小口径天线 口面场 高效率 低旁瓣 

分 类 号：TN82[电子电信—信息与通信工程]