Multi-focus Hologram with Fabry-Perot Antenna Based on Coding Metasurface

In this paper, A Fabry-Perot (FP) cavity antenna based on coding metasurface is addressed to realize a four-point focused hologram. A three-layer partial reflection surface (PRS) unit is designed by fixing the reflective phase to generate plane wave and arranging the transmission phase combined with the weight Gerchberg-Saxton (GSW) holographic algorithm to accomplish multi-focus. Four symmetrical focus points are perfectly observed in theory calculation and simulation with the location (±1.3λ, ±1.3λ, 2.5λ) at 27.5GHz operating frequency. This work can be extended for more complex hologram construction and 2-D beam steering applications in the future.