Design and Experimental Investigation on Reflective Metasurface Based on Split-Ring Resonator

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 reflective GMs are presented. Both simulation and experiment results demonstrate that a carefully designed gradient meta-surface 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.