A metasurfaced surface-wave antenna with performance enhancement

摘要

A wideband and high gain Metasurface (MTS)-based surface-wave antenna with a monopole-like radiation pattern for wireless communication system is presented in this paper. The proposed antenna consists of a centre-fed circular patch antenna, an air substrate layer and a MTS-loaded superstrate. By the use of the slow-wave structure of the MTS, surface waves can effectively launch on the top surface of the superstrate. The diffraction of surface waves forms a monopole-like radiation pattern. With the introduction of a single ring of truncated MTS surrounding the circular patch, the radiating field of the circular patch antenna is constructively transformed to diffraction fields of surface waves, yielding an enhancement on bandwidth and gain. The proposed antenna with a low profile of 0.075 free-space wavelength achieves a 19.4% (4.69-5.7GHz) bandwidth centred at 5.2GHz and an average gain of 7.32 dBi.