A Design of Wideband, Miniaturized Metasurface Antenna

A wideband, miniaturized metasurface antenna is proposed in this letter. The antenna is composed of two layers of metasurface and a ground plane, and fed by a microstrip line through a slot cut onto the ground plane, while the metasurfaces are both formed using an array of non-uniform rectangular patches. With the feeding slot right underneath the center of the metasurfaces, three resonance modes with boresight radiation patterns are excited simultaneously. Thus, working bandwidth is expanded, miniaturization and low-profile are achieved with extra parasitic structure. The simulated results show that the −10 dB impedance bandwidth of this antenna is 6.24-8.85 GHz (34.6%), the overall efficiency in the working band is higher than 86%, with an overall size of
$0.44\lambda_{\mathrm{L}}\times 0.44\lambda_{\mathrm{L}}\times 0.045\lambda_{\mathrm{L}}$
(where
$\lambda_{\mathrm{L}}$
is free space wavelength at the lower working frequency).