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Metasurface-based low profile broadband circularly polarized antenna
A broadband metasurface-based low profile antenna is proposed for circularly polarized (CP) radiation. The proposed broadband 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 × 60 mm × 4.8 mm exhibits desired performance from 3.65 GHz to 4.55 GHz (22%) for axial ratio (AR) <; 3.0 dB, gain greater than 6 dBic, and VSWR ≤ 2.