超宽频带双极化对数周期单脉冲天线  

Ultra-wideband dual-polarization monopulse tracking antenna

作　　者：张凤林[1] 丁晓磊 吕善伟[1] 张媛 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083 [2]航天科技集团第704研究所,北京100076

出　　处：《电波科学学报》2007年第5期751-754,共4页Chinese Journal of Radio Science

摘　　要：六个单极对数周期天线单元组成的轴对称圆形阵列天线,能在超宽频带内产生正交双极化的和、差方向图。首先从理论上分析了任意极化方向的点源天线组成的非相似圆形阵列的方向图,结果表明:圆形阵的直径满足0.25λ～0.5λ时,和方向图的Eθ分量-10dB波束宽度约为130°～100°,可作为超宽频带抛物面单脉冲天线的照射器。以点源阵的分析结果为指导,设计了工作频率为1～8GHz的单脉冲天线,并结合HFSS软件的仿真结果对阵列参数进行了优化。给出了圆形天线阵的驻波以及方向图的实测结果,在0.85～8.5GHz范围内,照射器的驻波比小于2.5。An ultra-wideband tracking antenna array constructed by six log-periodic monopole antennas （I.PMA） is designed, it can generate dual-polarized sum-and difference-patterns. The pattern of a circular array of six current elements with arbitrary directions of polarization is analyzed. The result reveals that when the diameter of the circular array is in the range of 0.25λ-0.5λ, the -10 dB Eθ beam width of the sum-pattern of the array is in the range of 130°-100°, so, the array can be used as an illuminator of an ultra wideband monopulse reflector antenna. A monopulse antenna array printed on PCB covering frequencies from 1 GHz to 8 GHz is designed in the help of software of HFSS. VSWR and dual CP polarization sum-and difference-patterns of the antenna are tested, VSWR of the illuminator is less than 2.5 in the range of 0.85-8.5 GHz.

关 键 词：超宽带天线 单脉冲 单极对数周期天线 

分 类 号：TN82[电子电信—信息与通信工程]