相控阵天线空域极化特性的高频仿真分析  

High frequency simulation anatysis of spatial polarization characteristic of phased array antenna

作　　者：戴幻尧[1] 李永帧[1] 薛松 王雪松[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073 [2]未尔科技,北京100000

出　　处：《电波科学学报》2011年第2期316-322,412,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金重点项目(60736006),国家自然科学基金青年科学基金项目(60802078);“十一五”预研项目(51309060305);国防科技大学博士研究生创新资助项目(B090401)

摘　　要：以天线的空域指向为变化因素来分析研究相控阵天线的空域极化特性,推导了偶极子线性阵列在空域波束电扫时的极化特性。采用三维电磁仿真平台(XFDTD)设计了具有625个单元的平面矩形相控阵天线,计算了天线远场的主极化和交叉极化分量,进而利用空域极化描述子得到了不同波束指向下典型相控阵天线极化特性的变化规律。结果表明:相控阵天线的极化特性分析较机械扫描体制复杂,其极化状态的改变取决扫描角、阵元特性以及阵元耦合等非理想因素,并随扫描角近似线性变化。该结论和理论分析的结果相吻合,为相控阵天线空域极化特性的应用提供了理论依据和支持。Antenna spatial oriented direction is taken as variation to study the spatial polarization characteristic of phased array. The polarization property of electronic scanned linear dipole array is derived. A planar phased array antenna with 265 elements is designed by using XFDTD. The co-polarized and cross-polarized component of far field is computed. The changing rule of typical phased array polarization characteristic in different beam position is obtained by spatial polarization character istic. Result shows that the spatial polarization characteristic of phased array is more complicated than mechanical scanned antenna, and its polarization states change with scan angle, element polarization property and some imperfect factor like element coupling. The changing rule is nearly linear variation. The conclusion is consistent with theory analysis. It provides theoretical base and support for the application of the spatial polarization characteristics of the antenna.

关 键 词：相控阵 极化特性 XFDTD扫描角 阵元特性 

分 类 号：TN95[电子电信—信号与信息处理]