Abstract
This study proposes an ultra-wideband (UWB) metasurface-based beam-switching antenna system. A coplanar (CP) waveguide fed slot antenna (with 49% operating bandwidth) is coupled with a hexagonal metallic aperture to generate CP beam in the 10.2–10.8 GHz band. An octagonal split ring inclusion-based meta-element is designed to achieve 2π transmission phase variation with near-unity magnitude. The principle of the Pancharatnam–Berry metasurface is used to design an offset metasurface superstrate for tilting the main beam of the UWB antenna for the CP band. Measured results (S11, axial ratio, and radiation pattern) agree well with full-wave simulations. The fabricated X-band UWB aperture coupled antenna system uses the metasurface superstrate to achieve a broadside beam for the lower band and tilted beam for the upper band. This antenna system holds promise for next-generation vehicular and satellite communication applications.
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