Abstract

A circularly polarized (CP) metasurface antenna is proposed in this paper. The metasurface is an array of subwavelength square patches. The characteristic modal of metasurface is analyzed by the theory of characteristic mode (TCM), and the desired characteristic mode is selected to form circular polarization radiation. Then, a proper feeding network is further empolyed to form CP radiation. Based on these concepts, an antenna with low profile is designed. The simulated results show that the impedance and axial-ratio(AR) bandwidths are 1.95 GHz and 1.05 GHz respectively, and their relative bandwidths are respectively 34.8% and 18.8%. Moreover, the antenna average gain is 6.25 dBi in the whole axial-ratio bandwidth.

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