A Miniaturized Wideband Circularly Polarized Antenna using Metasurface

A single-feed miniaturized wideband circularly polarized (CP) antenna with metasurface is planned for L-band applications. The projected multilayered antenna comprises of a patch radiator with embedded ring-shaped slot and grounded-via, a stacked slit-slotted-circular patch, a metasurface with
$5\times 5$
-unit cells, and a coaxial feeding probe. An antenna prototype at L-band exhibits -10-dB reflection coefficient
$(\vert \mathrm{S}_{11}\vert)$
bandwidth of 15.7% (1.488 GHz-1.742 GHz), 3-dB axial ratio (AR) bandwidth of 11.0% (1.50 GHz-1.675 GHz), and gain of
$> 5.0\text{dBic}$
within the 3-dB AR-bandwidth with an overall size of
$\boldsymbol{0.375 \lambda_{0} \times 0.375 \lambda_{0} \times 0.065 \lambda_{0}}$
at 1.5 GHz.