Low-profile Wideband Linearly/Circularly-polarized Metasurface Antennas Fed By Coplanar Waveguide Lines

Novel low-profile wideband linearly/circularly-polarized antennas using metasurface fed by coplanar waveguide lines are proposed. The linearly-polarized antenna is formed by a periodic array of square-patch metasurface (MS) cells, which are excited by the coupling slot in the ground plane right underneath. Thanks to the feeding of a coplanar waveguide line, only one substrate layer with a low profile of 0.038 λ
₀
and a simple configuration is required and a very large bandwidth (44.17%) can be realized. In addition, based on a corner-truncated polarization-rotation metasurface (PRMS) cells, a circularly-polarized MS antenna with a low profile of 0.05λ
₀
is also constructed. The impedance bandwidth of 88% and 3-dB axial-ratio bandwidth of 20% are achieved.