一种CPS馈电的宽带圆极化双菱环天线  

Broadband Circularly Polarized Dual Loop Antenna Fed by Coplane Stripline

作　　者：周建永[1] 杨雪霞[1] 高艳艳[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《无线电工程》2010年第5期40-42,共3页Radio Engineering

摘　　要：提出了一种新型的双菱环形天线,通过在双菱环内添加寄生环来提高天线的圆极化带宽,每个环上槽口的位置决定天线的圆极化特性。双菱环和寄生双菱环分别在低频和高频处产生圆极化波,从而使天线的圆极化带宽增加,3 dB圆极化带宽达到了24.1%,在圆极化频带内增益为10 dB以上。为了测量天线性能,设计了共面带状线到微带线的转换巴伦,因为巴伦和天线在同一个平面内,所以对天线的性能产生了一点影响。A dual rhombic loop antenna with a parasitic loop which increases the bandwidth of circular polarization is proposed.The gap position of each loop controls the sense of antenna circular polarization.The large dual rhombic loop radiates a CP wave at a lower frequency while the parasitic loop produces CP radiation at a higher frequency,which leads to the enhancement of the circular polarization bandwidth,and a bandwidth of 24.1%（AR≤3 dB） with a gain of 10 dB is obtained.For measuring,a balun from the coplanar stripling（CPS） to a microstrip line is designed.The balun is on the same plane with the antenna so it has a little effect on the antenna characteristics.

关 键 词：圆极化 环天线 宽带 共面带状线(CPS) 

分 类 号：TN821.4[电子电信—信息与通信工程]