一种CPS馈电的宽带圆极化双菱环天线

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。

Broadband Circularly Polarized Dual Loop Antenna Fed by Coplane Stripline

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.