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中文摘要：
相位梯度超表面可在其表面形成额外的平行波矢分量,从而可对反射波的反射方向进行调控,导致反常反射现象。主要研究在垂直入射情况下通过反射超表面实现对电磁波的反常反射,首先阐明了反射超表面的设计原理,得到了反射超表面的设计理论,并设计了基于开口谐振环的反常反射超表面。仿真和测试结果表明,通过优化设计不同结构参数的开口谐振环阵列单元,可以在设计频点处通过超表面平行波矢控制电磁波的反射方向,将反射波偏折到设计方向。由于其对电磁波反射方向的自由调控,反射超表面在天线、隐身等领域具有重要的应用前景,可望应用于高方向性天线、雷达散射截面缩减、反射聚焦平板等。
英文摘要：
Gradient metasurfaces （GMs） can provide additional parallel wave vectors for reflected waves and induce anomalous reflection. Hence EM wave reflection can be redirected using reflective GMs. In this paper, we focus our research on the manipulation of EM wave reflection using reflective GMs under normal incidence. The theory and design method of re- flective GMs are presented. Both simulation and experiment results demonstrate that a carefully designed gradient meta-sur- face based on the split-ring resonators （ SRRs ） supports high-efficiency anomalous reflections at the designed frequency, which agree quite well with theoretical predictions. For the ease of manipulating the reflected waves at will through the phase gradient, such GMs are very attractive for application in high directivity antennas, RCS reduction, flat focusing, etc.
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