Slot coupled dual band high gain circularly polarized metasurface antenna

This article presents a slot coupled dual-band metasurface (MTS) based antenna with high gain and circular polarization characteristics. The MTS consists of two different unit cells, which give rise to two operating bands. The metasurface is excited by the slot aperture fed by a 50 omega microstrip feed-line. The circular polarization is achieved by the diagonally oriented rectangular patch-based unit cells on top of the square substrate. Two orthogonal modes of MTS are required to produce circularly polarized waves, and these modes are excited by the slot aperture. The proposed MTS-inspired antenna is fabricated and experimentally validated. The experimentally verified impedance bandwidth of 33.71% in the lower frequency band and 5.35% in the upper-frequency band is achieved. The measured 3 dB (AR <3 dB)axial ratio bandwidth of 6.22% and 0.98% with a peak gain of 8.89 and 6.32 dBic is achieved with respect to 4.8 and 6.4 GHz resonant frequencies.

Automated summary

This article presents a slot coupled dual-band metasurface antenna that achieves high gain and circular polarization characteristics. The antenna consists of two different unit cells, resulting in two operating bands. The circular polarization is achieved by diagonally oriented rectangular patch-based unit cells on top of the square substrate. The proposed antenna is fabricated and experimentally validated, achieving a wide impedance bandwidth and a measured 3 dB axial ratio bandwidth with peak gains at specific resonant frequencies.