A Dual-Polarized Reconfigurable Antenna With Enhanced Gain and Bandwidth Enabled by Integrating Metasurface and Metal Sidewalls

In this letter, a strategy for integrating metasurfaces and metal sidewalls is proposed to simultaneously optimize the radiation gain and bandwidth of the antenna. An octagonal patch antenna structure was designed, and dual polarization radiation was achieved through orthogonal direction feeding ports. Simultaneously, port isolation was optimized by adding a rectangular structure between the feed port and the octagonal patch. By adding foldable metal sidewalls to the antenna sides to enhance current intensity, the radiation gain is significantly improved. Furthermore, the integration of an isotropic cross-branch metasurface at the top of the antenna has been demonstrated to achieve a relative bandwidth of 61.8% and a peak gain of 13.37 dBi at 4 GHz. The average gain within the operating frequency band is approximately 5.27 dB higher than that of a solely patch-based configuration. The prototype has been fabricated, and the aforementioned performances have been experimentally validated.