一种宽带宽波束圆极化微带天线的设计  

Design of a Circularly-polarized Microstrip Antenna with Broad Band and Wide Beamwidth

作　　者：乔纯鑫 汪敏[1] 杨孝荣 吴文[1] QIAO Chunxin;WANG Min;YANG Xiaorong;WU Wen(Key Laboratory of Near-Range RF Sensing ICs&Microsystems(NJUST),Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学近程射频感知芯片与微系统教育部重点实验室,南京210094

出　　处：《微波学报》2024年第3期1-6,共6页Journal of Microwaves

摘　　要：本文设计了一款宽带宽波束圆极化微带天线。天线采用堆叠的双层圆贴片结构,结合四点顺序旋转馈电方式,实现了宽带圆极化辐射性能;在叠层圆贴片周边加载垂直接地金属柱环形阵,利用波束引向作用和等效零模谐振特性,在大带宽范围内实现了半功率波束宽度(HPBW)的有效展宽,并保证宽带宽波束内的圆极化辐射性能。对天线进行了加工、测试。实测结果表明,S 11小于-10 dB的阻抗带宽(4.54 GHz~11.50 GHz)为87%,覆盖了期望的应用工作频带6 GHz~10 GHz;轴比小于3 dB的带宽达到了33.1%(6.71 GHz~9.36 GHz);HPBW在6 GHz~8 GHz范围内接近100°,在整个带宽内均超过75°;除了9.5 GHz以上频段,工作频带内的6 dB轴比波束宽度覆盖范围都接近200°,表明天线在宽带和宽波束内具有良好的圆极化性能。In this paper,a broadband circularly-polarized microstrip antenna is designed.The antenna adopts a stacked double-layer circular patch structure,combined with a four-point sequential-rotation feed,to achieve broadband circularly polarized radiation performance.A ring array of vertically grounded metal columns is loaded around the laminated circular patch,which introduces the beam steering effect and equivalent zero mode resonance characteristics to effectively broaden the half-power beam width(HPBW)over a broadband and ensure the circular polarization radiation performance within the broadband and broad beam volume.A prototype antenna is fabricated and measured.Measured results show that the impedance bandwidth(4.54 GHz~11.50 GHz)of S 11 less than-10 dB is 87%,covering the expected application working frequency band of 6 GHz~10 GHz.The bandwidth with axial ratio less than 3 dB reaches 33.1%(6.71 GHz~9.36 GHz).HPBW approaches 100°in the range of 6 GHz~8 GHz,and more than 75°in the whole bandwidth.Except for the frequency band above 9.5 GHz,the 6 dB axial ratio beamwidth coverage in the working frequency band is close to 200°,indicating that the antenna has good circular polarization performance during a broad band and wide beamwidth.

关 键 词：宽带 宽波束 圆极化 顺序旋转馈电 

分 类 号：TN822.8[电子电信—信息与通信工程]