变形反射面天线馈源最佳相位中心的研究  

A Study on the Optimal Feeds Phase Center for Distorted Reflector Antennas

作　　者：宋立伟[1] 段宝岩[1] 郑飞[1] 

机构地区：[1]西安电子科技大学机电科技研究所,陕西西安710071

出　　处：《北京理工大学学报》2009年第10期894-897,共4页Transactions of Beijing Institute of Technology

基　　金：国家"九七三"计划项目(61358)

摘　　要：针对变形反射面天线馈源相位中心选取的问题,提出了寻找天线馈源最佳相位中心的优化模型.该模型基于变形反射面天线馈源相位中心与远场方向图的函数关系式,可得到天线反射面存在任意表面误差时的馈源最佳相位中心,使得天线的增益损失最小.将该模型应用于某8 m反射面天线的工程计算中.在仅考虑天线自身重力荷载的情况下,确定了天线不同仰角时的馈源最佳相位中心.数值模拟结果表明,该优化模型所确定的增益损失小于最佳吻合抛物面时的增益损失.To determine the feeds phase center for distorted reflector antennas,the optimization model is given.The proposed model bases itself on the expression between feeds phase center of distorted reflector antennas and its far-field pattern.The optimal feeds phase center of reflector antennas existing reflector surface errors can be worked out to obtain the minimal gain loss by this model.Finally,as an example,a practical calculation is carried out for a 8 m reflector antenna.Only considering the gravity loading cases,the optimal feeds phase centers can be obtained in different elevation cases.The numerical results show that the gain loss of the given model is less than the one of best fit paraboloid.

关 键 词：反射面天线 馈源相位中心 反射面表面误差 增益损失 

分 类 号：TN823.27[电子电信—信息与通信工程] TN820.88