多频段环焦型椭圆波束天线优化设计  

Optimization design of multi-band ring-focus antenna with elliptical beam

作　　者：刘兴隆[1] 杜彪[1] 周建寨[1] 解磊[1,2] LIU Xinglong;DU Biao;ZHOU Jianzhai;XIE Lei(The 54th Research Institute of CETC,Shijiazhuang 050081,China;National Laboratory of Science and Technology on Antennas and Microwaves,Xidian University,Xi’an 710071,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,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,西安710071

出　　处：《电波科学学报》2022年第3期497-504,共8页Chinese Journal of Radio Science

摘　　要：针对小口径低剖面天线的多频段、低旁瓣和高效率的需求,提出一种基于切割赋形环焦天线和非均匀有理B样条(non-uniform rational B-spline,NURBS)曲面的环焦型椭圆波束天线的综合优化设计方法.该方法首先采用样条函数将一维口面场参数化,针对赋形切割环焦天线进行第一次快速优化设计;然后,用NURBS曲面将优化后的天线主副反射面再次参数化,引入多目标优化差分进化算法,以天线效率和第一旁瓣为优化目标,对该环焦型椭圆波束天线进行第二次优化设计.应用该方法设计并加工了一个410 mm×720 mm的环焦椭圆波束天线,工作频率覆盖了Ku/K/Ka三个频段,天线总效率达到49%以上,第一旁瓣低于–14 dB,电压驻波比小于1.44∶1.实测结果和全波仿真结果吻合良好,验证了本文设计方法的有效性.A synthetical optimization design method of elliptical beam antenna with ring-focus structure based on the cutting shaped ring focus antenna and non-uniform rational B-spline surface(NURBS)is proposed for the requirements of multi-band,high efficiency,low side-lobe,and low-profile antennas with small-aperture.Firstly,the one-dimensional aperture distribution is parameterized by spline function and the electrical performance of the cutting shaped ring-focus antenna is quickly optimized.Secondly,the main-and sub-reflectors of the optimized antenna are parameterized by NURBS surface,and a multi-objective optimization differential evolution algorithm is introduced to optimize the efficiency and first sidelobe of the ring-focus elliptical beam antenna.A 410 mm×720 mm ring-focus elliptical beam antenna is designed and fabricated.The operating frequency covers Ku/K/Ka tri-band.The total efficiency of the antenna is greater than 49%,the first sidelobe levels are lower than–14 dB,and the voltage standing wave ratio is less than 1.44∶1.The measured results are in good agreement with the full-wave simulation results,which verifies the effectiveness of the proposed design method.

关 键 词：多频段 低剖面 椭圆波束 环焦天线 高效率 低旁瓣 

分 类 号：TN82[电子电信—信息与通信工程]