Design of a compact wideband <scp>CP</scp> metasurface antenna

Abstract

In this article, a new compact metasurface circularly polarized (CP) antenna is presented, where the rotating 45° periodic ellipse patch is used to achieve polarization conversion from linearly polarized to CP. The meta-surface is composed of 4 × 4 ellipse patches with 45° rotation, which are etched on the top layer of upper substrate. A slot ground plane and a coplanar waveguide structure are printed on both sides of bottom substrate, and the bottom substrate is directly connected to the upper substrate, which can make the antenna profile lower. As demonstrated in this article, the presented antennas have good characteristics of excellent 3-dB axial ratio bandwidth of 17.4% (5.25-6.25 GHz), and wide 10-dB impedance bandwidth of 20.6% (5.0-6.15 GHz).