局部大曲率天线罩结构高频误差分析  

High Frequency Error Analysis of Local Large Curvature Radome Structure

作　　者：王威[1] 万国宾[1] 巩亚萍 袁中毅 

机构地区：[1]西北工业大学电子信息学院,西安710129 [2]中航工业济南特种结构研究所,济南250023

出　　处：《遥测遥控》2013年第5期5-9,共5页Journal of Telemetry,Tracking and Command

基　　金：航空科学基金(20101853019)

摘　　要：天线罩设计常用的高频方法基于局部平板近似、网络传输矩阵和等效电磁流积分。罩面曲率等因素对高频方法计算精度的影响虽被关注,却缺乏精确的分析。建立天线罩尖部大曲率区域和平滑罩面上局部大曲率扰动两种模型,以体积分方程法的计算结果为基准,研究口径积分-表面积分法的计算误差与局部罩面曲率的关系。结果表明,物理光学法在罩面曲率半径大于三倍波长时能达到较好的精度,但在小于两倍波长时将出现严重的计算误差。High frequency radome analysis approaches,based on local planar approximation,transmission matrix,and equivalent current integral,are widely adopted in the radome design. Although it is well known that the curvature is one of the main factors contributing to the computational error in these methods,no precise analysis has been presented. In this paper,two radome models are constructed,with big curvature tip region or local curvature perturbation on side wall. Based on the results of volume integral equation method,these models are studied to explore the relation of local curvature and computational error for the aperture integration-surface integration method. It is demonstrated that the radome wall curvature radius should be more than three wavelengths in physical optics approaches for acceptable accuracy,while the curvature radius less than two wavelengths means remarkable computational error.

关 键 词：天线罩 物理光学法 局部平板近似 误差 曲率 

分 类 号：TN820.8[电子电信—信息与通信工程]