Broadband dual‐polarized metasurface antenna with high isolation and low cross‐polarization

Abstract

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 Â 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 λ 0 Â 1.46 λ 0 Â 0.07 λ 0 (λ 0 is the free-space wavelength at center frequency) is fabricated. The proposed antenna could achieve dual-polarization operation. The experiment results show that the À10 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 À28 dB. Moreover, broadside radiation performances for two ports are obtained.

A novel broadband windmill‐shaped metasurface antenna with stable radiation patterns

“…As shown, when compared with antennas in refs. [8,13,14,[20][21][22], the proposed windmill-shaped MTS-based antennas (Ant. I and Ant.…”

“…In Table 2, the comparisons with previously reported wideband MTS‐based antennas [8, 13–16, 20–22] are concluded. As shown, when compared with antennas in refs.…”