低PIM双圆极化微带天线设计  

Design of a Dual-Circularly Polarized Microstrip Antenna with Low PIM

作　　者：王浩[1] 张蕾[1] 吕庆立[1] 崔兆云[1] 施锦文[1] WANG Hao;ZHANG Lei;LYU Qing-li;CUI Zhao-yun;SHI Jin-wen(China Academy of Space Technonogy(Xi′an),Xi'an 710100,China)

机构地区：[1]中国空间技术研究院西安分院,西安710100

出　　处：《微波学报》2022年第1期12-15,共4页Journal of Microwaves

摘　　要：提出了一种适用于卫星平台的低无源互调(PIM)双圆极化微带天线。采用3 dB耦合器,天线在S频段内实现双圆极化,满足星载收发应用要求。同时针对星载收发共用天线对加工工艺、力学条件、使用环境及PIM的苛刻要求,设计采用空气微带馈电网络耦合馈电,配合局部介质支撑的方式,在保证天线电性能的基础上,增强了工程可实现性,降低了PIM风险。仿真及测试结果显示,天线整体结构紧凑,在收发频带内驻波优于1.2,法向轴比优于1.0 dB,双圆极化端口隔离度优于-20 dB;同时实测PIM电平优于-130 dBm(功率10 W×2,9^(th)),显示了良好的电性能。A satellite microstrip antenna with dual-circularly polarized and low passive intermodulation(PIM) performance is proposed. Based on the 3 dB coupler, the antenna with dual-circularly polarized performance for satellite T-R community application at S-band is obtained. In order to meet the space antenna′s strict requirements on processing technology, operating environment and PIM control, an air microstrip coupling feed network with media support is designed, which leads to an enhanced engineering feasibility and a low risk of PIM. The measured results show that the compact antenna has a good electrical performance, namely, at the T-R frequency the VSWR, axial ratio and isolation of the two circularly polarized ports are better than 1.2 dB,1.0 dB and-20 dB respectively. Meanwhile, the measured PIM value is below-130 dBm@10 W×2, 9^(th)order.

关 键 词：星载 双圆极化微带天线 低无源互调 设计 实现 

分 类 号：TN820[电子电信—信息与通信工程]