Design of Frequency-and Polarization-Reconfigurable Antenna Based on the Polarization Conversion Metasurface

A frequency- and polarization-reconfigurable antenna composed of a metasurface, a planar slot antenna, and a metallic reflector is proposed in this letter. The metasurface is made up of 64 identical patches, and all the patches are on the top surface of the substrate. In order to extend the bandwidth of the antenna, the planar slot antenna adopts a double-slot structure. The reconfiguration of frequency and polarization can be achieved by adjusting the relative positions between the metasurface and the planar slot antenna. The antenna can be reconfigured to linear polarization, and left-hand and right-hand circular polarizations. At the same time, the gain of the antenna is improved. In order to verify this method, a frequency- and polarization-reconfigurable antenna is designed. Simulation and experimental results show that the polarization reconfiguration can be achieved from 8 to 11.2 GHz (fractional bandwidth of 33.33%) by adjusting the distance among the metasurface, source antenna, and metallic reflector. The maximum gain can achieve 16.5 dBi.