低剖面极化可重构超表面天线

Low-profile polarization reconfigurable metasurface antenna

提出了一种低剖面极化可重构超表面天线.天线由三部分组成:3×4金属矩形贴片阵列组成的超表面覆层、缝隙耦合天线和直流偏置控制电路.电路包括8个PIN二极管开关组成的四对开关(PIN1,PIN2,PIN3和PIN4)和直流偏置线,通过控制上述四对PIN开关的工作状态,天线可以在线极化、左旋圆极化和右旋圆极化三种极化状态之间转换.对天线样机进行了加工并给出了实测反射系数、实际增益、轴比和归一化辐射方向图,结果表明:天线在不同工作状态下的共享工作频带为4~5.4 GHz,−10 dB阻抗带宽为29.8%;3 dB轴比带宽为8.3%,从4.6~5 GHz;各状态下的实测增益相差不大,其平均增益都大于5 dBi.仿真结果与实测结果吻合良好.

This paper proposes a low-profile polarization reconfigurable metasurface antenna.The antenna consists of three parts:a metasurface superstrate which is composed of a 3×4 array of metallic rectangular patches,a slot-coupled antenna,and a simple DC bias controlling circuit.The DC bias control circuit includes four pair switches consisting of eight PIN diode switches(PIN1,PIN2,PIN3 and PIN4)and DC bias lines.By controlling the working states of the PIN switches in different positions,the antenna can produce linear polarized(LP)wave,left-handed circular polarized(LHCP)wave,and right-handed circular polarized(RHCP)wave.The measured results of shared operating bands in different operating states show that the−10 dB impedance bandwidth is 29.8%from 4 to 5.4 GHz,and 3 dB AR bandwidth is 8.3%from 4.6 to 5 GHz.The measured gain in each condition varies little,and the average gain is greater than 5 dBi.The simulated and measured results are in good agreement.