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A Low-Profile Fabry–Pérot Cavity Antenna Using Anisotropic Metasurface

A Fabry–Pérot cavity (FPC) antenna utilizing a new cavity resonance phenomenon based on the polarization standing wave (PSW) is proposed. To produce PSW, two anisotropic metasurfaces acting as the handedness preserving mirror are designed as the two ends of the cavity. Such a cavity possesses a new resonant condition, i.e., the relative rotation angle and distance between two metasurfaces together determine its resonant frequency. Hence, in comparison to conventional FPC antennas, the proposed one possesses a lower profile height of around 0.125 wavelengths. The antenna concept is experimentally demonstrated for the 12 GHz X-band application. Measurement results agree well with simulations. A measured peak gain of around 17.28 dBi is obtained within the impedance bandwidth of 11.61–12.21 GHz. The PSW-based antenna brings a new approach for cavity antenna designs.