Since it is designable, metasurface was widely used in various fields, especially the design of polarization converters. However, most of the polarization converters currently designed can only work under normal incidence or small angle incidence, which hugely limits the application of the device. In this paper, a chiral metasurface based on the z-shaped unit cell, which can manipulate circular polarization wave, is proposed. The simulation result shows that this converter can maintain the polarization state of circular polarization after reflection from 8.18 to 13.988 GHz with a polarization conversion ratio of more than 90%. Moreover, the structure is insensitive to the incidence angle, which can keep a stable performance both for left-handed circularly polarized wave and right-handed circularly polarized waves as the incident angle increase to 75°. The proposed metasurface with simple structure and angular stability can be used in communication and polarization manipulating devices.

由于它是可设计的，因此超表面被广泛应用于各个领域，尤其是偏振转换器的设计。但是，当前设计的大多数偏振转换器只能在法向入射或小角度入射下工作，这极大地限制了该设备的应用。本文提出了一种基于z形晶胞的手性超颖表面，它可以操纵圆偏振波。仿真结果表明，该转换器可以在8.18 GHz至13.988 GHz反射后保持圆偏振态，偏振转换率大于90％。而且，该结构对入射角不敏感，当入射角增加到75°时，对于左旋圆极化波和右旋圆极化波都可以保持稳定的性能。所提出的具有简单结构和角度稳定性的超颖表面可用于通信和偏振操纵装置中。