High-Gain Broadband Dual-Polarized Antenna Employing Metasurface

A high-gain, broadband dual-polarized antenna based on metasurface (MS) is proposed. The MS consists of a 6 × 6 array of complementary units. The top of the designed unit is a cross-shaped unit, and the bottom is a square patch unit. The square patches MS provide sufficient phase compensation at high frequencies, which can enhance gain by focusing electromagnetic waves at high frequencies. The function of the cross-shaped MS is to improve impedance matching and broaden bandwidth. By combining the advantages of two types of MSs, broadband and high-gain are achieved. The measured results indicate that the gain is above 10 dBi in the range of 2.4–4 GHz. The antenna has a 10 dB return loss of 82.4% (1.75–4.2 GHz) and an isolation exceeding 30 dB. Additionally, the antenna maintains stable radiation patterns within the entire operating frequency range.