小型化平面螺旋天线及其宽频带巴伦的设计  

Design of Miniaturized Planar Spiral Antenna and Its Wideband Balun

作　　者：朱玉晓[1] 钟顺时[1] 许赛卿[1,2] 张丽娜[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072 [2]浙江正原电气股份有限公司,浙江嘉兴314003

出　　处：《上海大学学报（自然科学版）》2008年第6期581-584,共4页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(60571053);上海市重点学科建设资助项目(T0102)

摘　　要：介绍一种小型化的平面螺旋天线，该天线具有很宽的频带，在频段0.95～15.20 GHz内，实测反射损耗均小于-10 dB，同时在频段1.4～10.2 GHz内有较好的圆极化辐射特性（轴比小于4 dB）.与普通平面螺旋天线比较，该天线较大程度减小了天线横向尺寸，同时通过在天线下放置一圆台背腔，有效增宽了天线3 dB波瓣宽度（达130°）.设计了一种指数渐变的微带线到双线的非平衡平衡阻抗转换巴伦，仿真和实测结果显示，天线具有良好的圆极化和宽频带特性.This paper introduces a miniaturized planar spiral antenna with a very wide bandwidth. In the frequency range from 0.95 GHz to 15.20 GHz, the measured return loss is less than -10 dB. Good circular polarization performance （axial ratio〈4 dB） is obtained between 1.4 GHz and 10.2 GHz. Compared with the conventional spiral antenna, the proposed antenna significantly reduces the size and efficiently broadens the 3 dB beam width to about 130° by adding a conical back cavity beneath the antenna. Moreover, a wideband balun is designed using an exponentially tapered microstrip parallel-line wire. Simulation and experimental results show that the proposed antenna is of good circular polarization and wideband characteristics. 

关 键 词：平面螺旋天线 小型化 巴伦 背腔 

分 类 号：TN82[电子电信—信息与通信工程]