A wideband circularly polarized metasurface antenna using characteristic mode analysis is presented in this letter, which is composed of two-layer substrate, 4 × 4 circular patch metasurface, L-slot, transmission line, and air spacing. Through mode analysis, the metasurface structure can significantly enhance the bandwidth and gain of the antenna, and realize circular polarization (CP). After excitation, the air spacing and the L-slot can realize 90°difference between the characteristic angles of the two modes of the metasurface, and finally radiate CP. The measurement results show that the prototype has a −10 dB impedance bandwidth from 5.6 to 8.2 GHz (37.7%), a 3-dB axial ratio bandwidth from 6.2 to 7.8 GHz (22.9%), and a peak gain of 8.7 dBi at 6.4 GHz.

This article presented a wideband circularly polarization (CP) monopole antenna with elliptic ring slot patch using characteristic mode analysis (CMA). By analyzing the characteristic modes of elliptical patch and elliptical ring patch in turn, it is found that the elliptical ring slot patch can meet the phase requirement of CP. Then, the parasitic elliptical ring slot patch is used to broaden the impedance bandwidth and polarization bandwidth of the antenna.The broadband is obtained by the modal significance (MS) analysis, and the CP is realized by analyzing the characteristic current of two modes are orthogonal and the characteristic angle (CA) close to 90 . The proposed antenna was fabricated and measured with the size of 0.59λ 0 Â 0.59λ 0 Â 0.02λ 0 . The measured 3-dB axial ratio (AR) band is from 5.3 to 9.4 GHz (55.8%), and the À10 dB impedance band is from 4.5 to 9.7 GHz (73.2%).

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