用于近程被动成像的3mm波准光介质透镜天线设计  

Design of Quasi-Optical Lens Antenna for 3 mm Band Near Range Passive MMW Imaging

作　　者：陈其科[1] 樊勇[1] 张永鸿[1] 宋开军[1] 

机构地区：[1]电子科技大学极高频复杂系统国防重点学科实验室,成都611731

出　　处：《电子科技大学学报》2016年第2期168-173,共6页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(61271026)

摘　　要：针对近程焦平面被动阵成像系统应用,设计了3 mm波准光介质透镜天线。根据应用需求设计成像系统光路结构,并结合高斯准光理论得出光路设计参数;选择透镜表面为双凸非球面结构,利用光学分析软件ZEMAX优化设计透镜轮廓以减小成像像差;利用电磁仿真软件FEKO计算透镜天线近场分布,对设计进行验证与修正。测试结果表明,所设计的介质透镜在像平面上形成的聚焦波束3 d B尺寸仅为29.5 mm,偏轴时波束指向均匀性好,在700 mm(H)*1 800 mm(V)视场范围内波束功率电平值性改变量小于0.9 d B。A 3 mm quasi-optical dielectric lens antenna is designed for the near-range focal plane passive imaging system. The configuration of the quasi-optical lens antenna is designed to satisfy the requirement of the practical applications at first. Then, the initial parameters of the optical path are calculated based on the Gaussian quasi-optical method. To achieve the low aberration loss, the shape of the lens is designed with the biconvex aspheric surface, and optimized by using ZEMAX. After calculating and analyzing the near field of the lens with FEKO, the optimized contours of the lens are determined finally. Experimental results show that the 3d B beamwidth of the lens antenna is about 29.5 mm at the object plane of the imaging system. The off-axis performance of the lens antenna is uniform as well. The power level deviation for all the beams is less than 0.9 d B in the field of view of 700 mm（H）×1800 mm（V）.

关 键 词：焦平面阵列 高斯准光理论 被动毫米波成像 准光介质透镜天线 

分 类 号：TN82[电子电信—信息与通信工程]