表面误差对侧馈偏置卡塞格伦天线辐射场的影响  

Effects of random surface errors on radiation characteristics of the side-fed offset cassegrain antenna

作　　者：刘少东[1] 焦永昌[1] 张福顺[1] 

机构地区：[1]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

出　　处：《西安电子科技大学学报》2005年第6期865-868,900,共5页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60171045);教育部优秀青年教师资助计划项目

摘　　要：以侧馈偏置卡塞格伦双反射面天线为对象,通过数值计算方法分析了该天线的平均功率方向图,研究了反射面随机表面误差对天线辐射特性的影响.分析过程中首先将反射面上某点的随机误差量定义为该点在标准反射面法线方向上的偏移量,并认为反射面上每一个小区域内的偏移量相同,然后在随机表面误差带来的口径相位误差服从均值为零的正态分布的条件下,推导了天线平均功率方向图的计算公式,并利用该公式模拟计算了相关的数据和曲线.文中结果可为反射面制造精度的确定提供参考.The average power pattern of the Side-Fed Offset Cassegrain （SFOC） dual reflector antenna is analyzed, and the effect of the random surface error on radiation characteristics of the antenna is addressed. Here, the random surface error is defined as the error of the standard reflector in its normal direction and the error in a small zone of the reflector is considered as the same. We also assume that the phase error on the aperture led by the random surface error obeys the Gaussian distribution with a zero mean, under which the expression for the average power pattern is deduced, Finally, the data related to the radiation characteristics of the antenna are calculated and the corresponding curves are presented. The obtained results can be used to determine the manufacturing accuracy of the antenna＇s reflectors.

关 键 词：反射面天线 平均功率方向图 随机表面误差 正态分布 

分 类 号：TN823.27[电子电信—信息与通信工程]