Wideband circularly polarized slot coupled metasurface-based array antenna

Abstract

We present a 2 × 2 element array based on circularly polarized (CP) metasurface-based antennas fed by a sequential phase network. The single element consists of a microstrip-line-fed slot antenna coupled to a metasurface having 4 × 4 truncated corner square patches. The proposed array, with an overall size of 50 mm × 50 mm × 2.032 mm, resulted in an impedance bandwidth of 7.5 - 11.0 GHz (37.84%) for |S11| <; -10 dB and a CP radiation bandwidth of 8.4 - 10.7 GHz (24.1%) for axial ratio <; 3. In addition, the antenna yielded a broadside left-hand CP radiation with a peak gain of 13.7 dBic and radiation efficiency greater than 90% within the CP radiation bandwidth.