超表面加载极化可重构双极化微带天线设计

Design of polarization reconfigurable dual polarized microstrip antenna loaded with metasurface

基于超表面结构设计了一种2.555~2.655 GHz频段的极化可重构双极化微带天线。首先根据微带天线理论设计了缝隙耦合正交馈电的双极化微带贴片天线,然后提出并设计了一种方形切角的新型超表面结构,并将该超表面放置在双极化微带天线上,通过机械方式旋转超表面,实现了左、右旋圆极化和水平、垂直线极化之间的极化转换。利用HFSS仿真软件对该超表面加载微带双极化天线进行了仿真。结果表明,该双极化天线能够便捷地实现极化转换,且在两种极化状态下,天线在工作频带内的回波损耗小于–10 dB,隔离度大于20 dB,圆极化工作状态下的轴比小于3 dB,天线的整体性能良好。

Based on metasurface, a polarization reconfigurable dual polarization microstrip patch antenna in 2.555- 2.655 GHz band was designed. At first, a dual polarization microstrip patch antenna fed by two orthogonal slots was designed by the theory of microstrip antenna, then a new type of metasurface with square cutted corners was proposed and designed. The metasurface was placed on the dual polarization microstrip antenna, by mechanical rotating the metasurface. The transformation between left/right circularly polarized and horizontal/vertical linear polarization was achieved. The microstrip dual polarized antenna loaded with metasurface was simulated by using HFSS simulation software. The results show that polarization conversion for the dual polarized antenna can be achieved easily, and in the two kinds of polarization state, in the working frequency band, the return loss of the antenna is less than -10 dB, the isolation between two ports is higher than 20 dB, and the axial ratio of circularly polarized antenna is less than 3 dB. So the overall performances of the antenna are good.