上海大学学报(自然科学版)

• 通信与信息工程 • 上一篇    下一篇

小型化平面螺旋天线及其宽频带巴伦的设计

朱玉晓1,钟顺时1,许赛卿1,2,张丽娜1   

  1. (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)
  • 收稿日期:2007-09-03 修回日期:1900-01-01 出版日期:2008-12-21 发布日期:2008-12-21
  • 通讯作者: 钟顺时

Design of Miniaturized Planar Spiral Antenna and Its Wideband Balun

ZHU Yu-xiao,ZHONG Shun-shi,XU Sai-qing,ZHANG Li-na   

  1. (1.School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China;2.Zhejiang Zhengyuan Electric Co., Ltd., Jiaxing 314003, Zhejiang, China)
  • Received:2007-09-03 Revised:1900-01-01 Online:2008-12-21 Published:2008-12-21
  • Contact: ZHONG Shun-shi

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.

关键词: 巴伦, 背腔, 平面螺旋天线, 小型化

Abstract: 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. 

Key words: back cavity, miniaturization, wideband balun, planar spiral antenna

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