Quad-Band Shared-Aperture Antenna Using A Multi-Function Metasurface

A four-port shared-aperture antenna with a multifunction metasurface is proposed and analyzed in this paper. The adopted metasurface can be simultaneously used as the radiation sources of a S-band microstrip patch radiator and a Ka-band microstrip grid array (MGA) and as the partially reflective surfaces (PRSs) of a X- and a Ka-band Fabry-Perot (F-P) antennas. By integrating the above four radiators compactly, the final antenna operates at 2.3, 11.5, 26.0 and 40.0 GHz each with their bandwidths of 4.0%, 2.0%, 7.4% and 9.5%. Besides, within these operation bands, the realized peak gains are 7.1, 11.0, 15.2 and 19.2 dBi, respectively.