宽带宽波束圆极化微带八木天线  

Broadband wide beam-width circularly polarized microstrip Yagi antenna

作　　者：叶喜红[1] 何芒[2] 周平源[2] 

机构地区：[1]天津理工大学中环信息学院电子信息工程系,天津300380 [2]北京理工大学信息与电子学院,北京100081

出　　处：《电波科学学报》2015年第4期759-763,共5页Chinese Journal of Radio Science

摘　　要：提出了一种具有两级双贴片引向器结构的双馈圆极化微带八木天线.通过移除部分接地板结构,有效地增大了天线在端射前向的圆极化增益和波束宽度.等幅异相的同轴双馈模式使得该天线具有较宽的工作频带.数值仿真与实验结果表明:该天线同时满足驻波比RVSW≤1.5及端射方向轴比RA≤3dB的相对带宽为11%.天线在俯仰面仰角0°至80°的范围内具有良好的圆极化辐射特性,方位面主极化半功率波瓣宽度达到88°,同时具有较高的辐射前后比.良好的工作特性表明此天线可作为机载或弹载通信的备选天线.A dual-fed circularly polarized(CP)microstrip Yagi antenna with two-stage double-patch directors is proposed.By removing part of the ground plane,the gain and beamwidth at the end-fire direction is enhanced effectively.Due to the use of the dualfeed with equal amplitude but different phase,broadband CP radiation is realized as well.Numerical and measured results show that the overlapped bandwidth of voltage standing wave ratio less than 1.5and axial ratio lower than 3dB at the end-fire direction is about 11%.The proposed antenna has CP radiation from elevation angle 0°to 80°at the elevation plane,while at the azimuthal plane the half power beamwidth is 88°with large front-to-back ratio,which indicates that the proposed antenna is a good candidate for aircraft-or missile-borne communications.

关 键 词：微带八木天线 端射天线 宽波束 圆极化 

分 类 号：TN823.17[电子电信—信息与通信工程]