一种倾斜波束双极化天线  

A Dual-Polarized Antenna with Tilted Beam

作　　者：程乾 刘淑芳[1] 梁硕毅 张大林 薛源 CHENG Qian;LIU Shu-fang;LIANG Shuo-yi;ZHANG Da-lin;XUE Yuan(National Key Laboratory of Antennas and Microwave Technology,Xidian University,Xi'an 710071,China)

机构地区：[1]西安电子科技大学天线与微波技术国家重点实验室,西安710071

出　　处：《微波学报》2021年第6期71-74,91,共5页Journal of Microwaves

摘　　要：提出了一种具有倾斜波束辐射特性的新型双极化天线。该双极化天线由两个正交的纺锤形偶极子组成,根据准八木天线原理,在偶极子两侧加载寄生振子作为反射器和引向器,用以实现倾斜波束辐射。这种纺锤形偶极子可以增加电流长度从而减小天线的整体尺寸。同时在每个偶极子贴片上蚀刻两个梯形槽,以实现良好的阻抗匹配。另外,通过连接到同轴线的金属短截线对纺锤形偶极子进行激励,简化了天线馈电结构。测试结果表明,天线的阻抗带宽为3.36~3.69 GHz(S_(11)<-10 dB),两个极化端口之间的隔离度大于16 dB,波束倾斜度为30°,波瓣宽度约为85°,可适用于单侧大角度扫描阵列。In this paper,a novel dual-polarized antenna with tilted beam capability is proposed.The dual-polarized antenna is composed of two perpendicularly crossed spindle-shaped dipoles.Based on the principle of quasi-Yagi antenna,parasitic elements are placed on both sides of dipoles as reflector and director.The spindle-shaped dipole is employed to increase the current length and reduce the overall size of the antenna.And by etching two trapezoidal slots on each dipole patch,a good impedance matching can be achieved.Each spindle-shaped dipole is excited by a metal stub that is connected to a coaxial line,thus simplifying the antenna feeding structure.The simulation and measurement results show that the proposed antenna has an impedance bandwidth of 3.36-3.69 GHz(S_(11)<-10 dB),and isolation greater than 16 dB between two polarization input ports and radiates a tilted beam of 30°with a good polarization purity,the beam width is around 85°,and is suitable for single-side large-angle scanning arrays.

关 键 词：双极化天线 倾斜波束 准八木天线 

分 类 号：TN821.1[电子电信—信息与通信工程]