Bandwidth Enhancement of Circularly Polarized Antenna Based on Dual Layer Metasurface
2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI)（2023）
Abstract
In this paper, a novel single-feed circularly polarized (CP) patch antenna loaded with a spiral-rhombus-shaped metasurface layer is proposed for communication application. Based on the dual layer 5 x 5 spiral shape external converter generating linear-to-circularly polarized wave, the antenna's AR bandwidth (ARBW) has significantly enhanced. Based on the mode analysis, the CP antenna's mechanism is theoretically examined. The parameters of single feeding structure are studied to achieve wide impedance bandwidth (BW) and axial ratio (AR) BW. The simulated relative impedance bandwidth and 3 dB ARBW were 21.5 % and 8.5 %, respectively, from 3.87 GHz to 4.21 GHz. The CP antenna has a maximum gain of 6.35 dBic.
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Key words
bandwidth enhancement,circularly polarized antenna,communication application,CP antenna,dual layer metasurface,dual layer spiral shape external converter,frequency 3.87 GHz to 4.21 GHz,linear-to-circularly polarized wave,simulated relative impedance bandwidth,single feeding structure,spiral-rhombus-shaped metasurface layer,wide impedance bandwidth
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