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This paper demonstrates a broadband dual‐polarized metasurface antenna with high isolation and low cross‐polarization using characteristic mode analysis. A wideband metasurface with stable radiation pattern is presented by splitting the edge patches into 2 × 2 sub‐array and introducing Minkowski fractal structure in the corner patches. To achieve the dual‐polarized operation, a pair of degenerate modes of the metasurface are selected, and thus high isolation and low cross‐polarization are obtained. The metasurface is excited by two slot antennas placed orthogonally. A prototype with an overall size of 1.46 λ0 × 1.46 λ0 × 0.07 λ0 (λ0 is the free‐space wavelength at center frequency) is fabricated. The proposed antenna could achieve dual‐polarization operation. The experiment results show that the −10 dB impedance bandwidths for each port are 28.9% (4.74–6.34 GHz) and 31.4% (4.62–6.34 GHz), respectively. The isolation between the two ports is higher than 31.8 dB, and cross‐polarization level is better than −28 dB. Moreover, broadside radiation performances for two ports are obtained. [ABSTRACT FROM AUTHOR]

This paper demonstrates a broadband metasurface antenna with stable gain. A 4 × 4 square patches metasurface loaded with nonuniform hexagonal slots is proposed. To achieve stable radiation performance in broadband range, two characteristic modes with the same current direction are selected as operating modes of the metasurface. A slot antenna is employed to excite the metasurface. By combining the resonant modes of metasurface and slot antenna, the broadband is obtained. The measured results show that, the −10 dB impedance bandwidth of the proposed antenna is 4.36–8.21 GHz (61.2%), the 2 dB gain bandwidth is 4.36–7.2 GHz (49.1%), and the peak gain value reaches 10.6 dBi. [ABSTRACT FROM AUTHOR]