X. Q. Nasimuddin and Z. N. Chen, "Metasurface-based low profile broadband circularly polarized antenna," TENCON 2017 - 2017 IEEE Region 10 Conference, Penang, 2017, pp. 2378-2382. doi: 10.1109/TENCON.2017.8228259
A metasurface-based low profile antenna is proposed for broadband circularly polarized (CP) radiation. The antenna consists of a rectangular patch radiator, a metasurface with an array of rectangular rings, and a coaxial probe. The broadband CP antenna with antenna volume of 80 mm x 60 mm x 4.8 mm exhibits desired performance from 3.65 GHz to 4.55 GHz (22%) for axial ratio (AR) less than 3.0 dB, gain greater than 6 dBic, and VSWR ≤ 2.