Aggressively Discretized Huygens' Metasurface: Realizing Efficient Anomalous Refraction with a Simple Design

Aggressive discretization by discretizing a metasurface into as few elements as required, can benefit the metasurface design with significantly enlarged unit cell size and lower requirement for surface impedance/phase coverage. Therefore, aggressive discretization allows one to design a metasurface with simple structure, which will potentially lead to high efficiency and broadband performance. In this work, we propose an aggressively discretized metasurface with three unit cells per period. It can realize anomalous refraction of an normal incidence to 45° with a power efficiency of 80% at the design frequency of 28 GHz, and the 3-dB power efficiency bandwidth is 13.3%. Compared to its finer discretized counterparts, our proposed metasurface achieves an improved performance using a significantly simplified design with the smallest feature size 26 -fold increased. The concept of aggressive discretization can find applications in metasurface designs in high frequencies.