一种宽频圆极化H形缝耦合微带天线设计  

Design of a Broadband Circularly-Polarized H-Sharped Aperture-Coupled Microstrip Antenna

作　　者：周军[1,2] 王玉峰[2] 周江昇[2] 

机构地区：[1]通信系统信息控制技术国家级重点实验室,浙江嘉兴314033 [2]江南电子通信研究所,浙江嘉兴314033

出　　处：《微波学报》2010年第S1期153-156,共4页Journal of Microwaves

摘　　要：设计了一种具有较低背向辐射的宽频带圆极化口径耦合微带天线。在口径耦合单元的馈线上附加一对寄生微带线枝节来阻抗匹配,以实现宽频带;利用H形口径耦合,减小贴片单元的后向辐射,提高天线效率;用威尔金森功分器移相器,使得两口径耦合馈电端口的正交电场相位差90°,从而获得圆极化波辐射。对提出的天线进行仿真及优化设计,最终天线获得了42.8%的阻抗带宽(VSWR<2),在30%带宽内获得了良好的圆极化性能(轴比<2dB;特别在1200MHz～1540MHz带宽内,具有最优的综合性能,具有6dBi以上的增益、20dB以上的前后比和交叉极化鉴别率。A broadband circularly-polarized(CP)H-shaped aperture-coupled microstrip antenna is presented in this paper with low back-to-front radiation level.A pair of parastic microstrip branch is added at the feeding line of the presented antenna for enhancing the impedance bandwidth.H-sharped apeture-coupled feeding is used in this antenna for reducing the back radiation and enhancing the radiational efficiency.Wilkinson power divider with 90° phase difference is used for pahse shifting of the two perpendicularity electric field,which CP wave is radiated.After simulation and optimization,relative impedance bandwidth of 42.8 percent is achieved of VSWR less than 2,and the axis ratio(AR)bandwidth is above 30 percent of AR less than 2dB.Espectially in 1200MHz～1540MHz,best performances is achieved for gain larger than 6dBi,back-to-front radiation level and cross polarization level less than-20dB.

关 键 词：宽频带 圆极化 微带天线 口径耦合 

分 类 号：TN822[电子电信—信息与通信工程]