大型介质夹层天线罩的电性能补偿方法  

Compensation method for the effect of large dielectric sandwich radomes on electrical performance

作　　者：李鹏[1] 许万业[1] 仇原鹰[1] 李华平 

机构地区：[1]西安电子科技大学电子装备结构设计教育部重点实验室,陕西西安710071 [2]空军西安飞行学院,陕西西安710306

出　　处：《西安电子科技大学学报》2013年第6期78-84,共7页Journal of Xidian University

基　　金：国家自然科学基金重点资助项目(51035006);国家自然科学基金青年基金资助项目(51205301);中央高校基本科研业务费资助项目(JY10000904019)

摘　　要：针对介质夹层天线罩在保护天线的同时,也会影响系统电性能的问题,研究罩体对电性能影响的主要因素,发现导致远场方向图畸变的主要因素是罩体透射系数导致的相位变化;通过分析其与罩体结构材料形式的关系,结合反射面天线的结构特点,提出了两种补偿方法.一是通过修正天线主反射面补偿,二是通过调整馈源的轴向偏焦补偿.考虑到工程实现的难度,重点讨论了轴向偏焦补偿.推导了偏焦调整量的计算公式,给出了使用条件.通过某9.14m地面卫星通信站的天线罩进行了数值仿真.结果表明:轴向偏焦补偿方法可行且有效,尤其对于方向图的畸变导致的副瓣和零深变化补偿效果显著.For the problem that the dielectric sandwich radome will affect the electrical performance of the enclosed antenna, the main factors of the effect have been studied, and it is found that the main reason for the distortion of the far field pattern is the change of phase in the aperture due to radome. The relation between phase change and radome＇s structure has been analyzed. Then considering the structural features of reflector antenna, some compensated schemes for electrical performance have been proposed. One is the modification of the main reflector, the other is to adjust the axial offset focus of the feed. The second scheme is discussed because it can be more appropriately applied in engineering practice. A formula for the offset focus value has been proposed, and so has the restriction of application. Some simulations have been done by a 9.14m dielectric sandwich radome of satellite earth station. The result shows that the compensated method of the axial offset focus is very effective, especially for the distortion of the far field pattern.

关 键 词：天线罩 介质夹层 轴向偏焦 相位补偿 电性能 

分 类 号：TN957[电子电信—信号与信息处理]