Wideband, co-polarization anomalous reflection metasurface based on low-Q resonators

Abstract

Wideband anomalous reflection using metasurface is usually accompanied by polarization conversion, which changes the polarization state of reflected waves. In this paper, we propose to realize wideband, co-polarization anomalous reflection using reflective phase gradient metasurface (PGM). To this end, a resonator with low quality factor Q is firstly designed as the elementary sub-unit of the PGM. Due to the wideband magnetic resonance of the resonator, nearly constant phase gradient can be achieved in a quite wideband from 14.0 to 21.0 GHz. Both the simulation and experiment verify the wideband, co-polarization anomalous reflection using the PGM. Since the polarization of reflected wave is unchanged after reflection, such PGMs can be used in many applications such as reflect array antennas, beam-steering antennas and radar cross-section reduction.