基于表面-电路-表面型超表面的大旋转角度异常反射和异常折射

An Anomalous Reflection and Anomalous Refraction with Large Rotation Angle Based on Surface-Circuit-Surface Metasurface

提出了一种基于表面-电路-表面型超表面(SCSMS)来实现高效率的异常反射和折射的方法。与传统的相位梯度超构表面(PGM)不同,提出的SCSMS首先通过表面天线将入射空间电磁波转换为导行波,然后通过调整背接电路的长度来实现相位梯度分布。最后,通过表面天线将波传回自由空间,从而实现想要的波前控制。通过这种方法,可以消除不必要的单元间耦合效应。为了说明所提出的波前调控方法的原理,设计了2个SCSMS分别进行20°入射50°反射的大旋转角异常反射和0°入射50°出射的大旋转角异常折射。仿真结果表明:该方案可以实现高效的异常反射和折射,效率分别为68%和79%。这为利用SCSMS实现具有大旋转角度的高效异常反射和折射或其他类型的波前操作提供了有效的案例。

A novel method for efficient anomalous reflection and refraction based on Surface-Circuit-Surface Metasurface(SCSMS)is proposed in this paper.Being different from traditional Phase Gradient Meta-surface(PGM),first,the proposed SCSMS is to convert incident spatial waves to guided waves by surface antennas,and then gradient phase distribution is to realize by adjusting the length of the back-loaded circuit.Finally,the wave is to be transmitted to the free space by the surface antenna,achieving the desired wave front control.By this way,unwanted coupling effects between units can be eliminated.To illustrate the principle of the proposed wave front regulation method,two SCSMS are designed for anomalous reflection(20°-50°)and refraction(0°-50°)respectively.The simulation results show that high efficient anomalous reflection and refraction can be achieved with efficiency of 68%and 79%respectively.And this program provides an effective case for efficient anomalous reflection and refraction with large rotation angles or other types of wave front operations using SCSMS.