一种双频左/右旋圆极化可重构环形缝隙微带天线

设计了一种频率比为1.9的双频左/右旋圆极化可重构环形缝隙微带天线,其在高频段和低频段分别工作于线极化和圆极化状态。在该天线中,环形缝隙和相互正交的四个缝隙臂将接地面分为五部分,缝隙臂上跨接两对PIN二极管开关和隔直电容。通过二极管开关的控制,天线在低频频率上可实现左/右旋圆极化的切换,在高频频率上则可保持其线极化性能不变。实验结果表明,天线在1.6 GHz的低频段上具有12.5%的3 dB轴比带宽,在3.06 GHz的高频段上其–10 dB阻抗绝对带宽为100 MHz,成线极化状态,辐射方向图近似不变。

A dual-frequency left/right hand circular polarized reconfigurable annular slot microstrip antenna

A dual-frequency left/right hand circular polarized reconfigurable annular slot microstrip antenna with a frequency ratio of 1.9 was designed.The antenna is in the linear and circular polarization state respectively at high and low frequency.In this antenna,the ground was divided into five parts by an annular slot combined with four orthogonal linear slot arms which were crossed by two pairs of PIN diode switches and capacitors.Through controlling the PIN diode switches,the left and right hand circular polarization of the antenna can switch to each other at low frequency,with no change in the linear polarization property of the antenna at high frequency.The results show that,at low frequency of 1.6 GHz,the antenna shows a 3 dB axial ratio bandwidth of 12.5%(from 1.5 GHz to 1.7 GHz);while at high frequency of 3.06 GHz,the antenna show a 10 dB return loss impedance bandwidth of 100 MHz with few change in the radiation pattern and linear polarization.