一种宽波束圆极化十字阵子天线  

A Wide-beam Circularly-polarized Crossed Dipole Antenna

作　　者：周进[1] 王玉峰[2] 常雷[2] 周江昇[2] 

机构地区：[1]海军702厂,上海200434 [2]中国电子科技集团公司第三十六研究所,浙江嘉兴314033

出　　处：《通信对抗》2014年第1期40-42,45,共4页Communication Countermeasures

摘　　要：给出了一种宽波束圆极化的十字阵子天线。通过对十字阵子天线正交臂长的比例调整,获得了90°相差的自相移结构,从而实现了圆极化波的辐射;通过开槽同轴线巴伦对天线进行平衡馈电,并结合微带线的阻抗变换,实现了宽频带的天线匹配;将正交偶极子的末端往底板方向折弯倾斜,展宽了天线的波束宽度。针对海事卫星终端的要求,设计天线的工作频段为1.525~1.665GHz,实现了工作带宽内的电压驻波比小于1.5、轴比小于3dB、波束宽度大于等于130°的电性能特性。A crossed dipole antenna is proposed in this paper with broad beam and circularly polarized perfor- mance. The circularly polarized radiation is obtained by the orthometric dipoles with 90° phase differences, which have a self-phase shifting structure with a suitable proportion of the dipole length. The antenna＇s impedance is matched in a broadband by both slot coaxial line Balun and microstrip line impedance transforma- tion. The dipoles tail end is bended to ground plane for broaden the beamwidth. For the marine satellite com- munication, the designed antenna operates at 1.525GHz-1.665GHz with vswr less than 1.5, AR less than 3dB and 3dB beamwidth larger than 130°.

关 键 词：十字阵子天线 圆极化 宽波束 海事卫星通信 

分 类 号：TN821.1[电子电信—信息与通信工程]