Prototype demonstrates a 34.9% impedance bandwidth and 13.2% axial ratio bandwidth, highlighting effective circular polarization.
A double‐layer wideband circularly polarised (CP) metasurface (MTS) antenna is proposed. The MTS consists of a 4 × 4 L‐shaped patch array. The modal behaviours of the proposed MTS are investigated using the characteristic mode theory. Two characteristic modes with orthogonal current distributions are selected as the operational modes. Furthermore, an aperture‐coupled feeding structure is employed to excite the two orthogonal modes with a 90° phase difference, enabling CP radiation. It can also excite the MTS to generate multiple resonances and axial ratio (AR) minimum points, which collectively yield an acceptable bandwidth for both impedance and AR. Finally, an antenna prototype is designed to validate the simulated results. The measured results show that the MTS antenna offers a −10 dB impedance bandwidth (IBW) of 34.9% (4.25–6.05 GHz), a 3 dB AR bandwidth (ARBW) of 13.2% (5.3–6.05 GHz) and a maximum gain of 7.3 dBic.
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Li et al. (2025) studied this question.
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