一种可用于相控阵的双点馈多层圆极化微带天线  

A Dual-fed Multi-Layer Circularly-polarized Microstrip Antenna for Phased Array

作　　者：闫鹏[1] 李阳[1] 李振海[1] 白旭东[1] 金荣洪[1] 耿军平[1] 梁仙灵[1] 

机构地区：[1]上海交通大学现代天线研究中心,上海200240

出　　处：《中国电子科学研究院学报》2012年第1期76-80,共5页Journal of China Academy of Electronics and Information Technology

基　　金："973"子课题(2009CB320403);上海市自然科学基金(10ZR1416600);教育部博士点基金(20090073120033);教育部留学回国人员科研启动基金;国家科技重大专项(2011ZX03001-007-03);自然科学基金创新群体(60821062)

摘　　要：设计出了一种双背馈空气夹层微带圆极化天线单元,该天线单元具有13%的阻抗带宽,最大辐射方向上轴比2.5 dB。用该天线单元以顺序旋转的方式组成四元阵,再用八个该天线单元和两组一分八功分器组成八单元阵列,研究了该阵列天线圆极化波束分别指向天线阵法向和偏转30°时的辐射特性和极化特性。该天线单元组阵圆极化轴比特性好,易于实现波束扫描,适合用于有源相控阵系统。A planar dual-back-fed circularly-polarized microstrip antenna is proposed based on the air mi- crostrip structure. The element has 13% impedance bandwidth and the axial ratio of maximum radiation direction is 2.5 dB. Based on the element design, a rotationally symmetric four-element array is also de- signed. Furthermore, in order to verify the circularly-polarized beam scanning characteristics of antenna array, an eight-element array is composed by eight elements and two power splitters to realize the beam pointing to the normal direction and 30° deviation respectively. The antenna owns good circular polarization axial ratio and is easy for beam scanning, which is very suitable for the active phased array applications.

关 键 词：圆极化天线 轴比 旋转结构 波束扫描 

分 类 号：TN82[电子电信—信息与通信工程]