Controlling Beam Directions using Self-reconfigurable Time-varying Metasurfaces

We reported a self-reconfigurable metasurface with a variable time constant depending on the embedded circuit parameters. Utilizing such a metasurface, a time-varying focusing plate is realized, in which an omnidirectional antenna radiation is transformed into directive beams having different angles depending on time. Analytical modeling based on time-varying sheet admittance provides a versatile platform under which such a metasurface may be designed. This self-reconfigurable time-varying metasurface may unlock many potential applications in wireless communication, radars, sensing and wireless power transfer.