Dual-Band Dual-Polarized Antenna Based on TDLS Metasurface for 4G/5G Base Station Applications

This brief presents a dual-band dual polarization (DP) antenna based on a cross-shaped metasurface with a terminal double-loop structure (TDLS) applied to 4G/5G base stations. The Fabry-Perot (FP) cavity is formed by introducing the TDLS metasurface above the dipole radiators, realizing the transition from single-band to dual-band and increasing the gain. After loading the TDLS metasurface, the DP antenna, whose total height is $0.46\lambda _{0}$ and planar reflector at the bottom is $0.77\lambda _{0}\times 0.77\lambda _{0}$ (where $\lambda _{0}$ is the wavelength at resonance point 2.3 GHz), realizes two broad bands of 2.05-2.55 GHz (21.74%) and 3.09-3.71 GHz (18.24%), reaching average gains of 8.86 dBi and 7.40 dBi respectively, which is about 3 dBi higher than that without metasurface, and has a stable radiation pattern. As well as, the 3-dB half-power beamwidth (HPBW) is stabilized at $63.5^{\circ }\pm 6.6^{\circ }$ , and the isolation is more splendid than 30 dB. Eventually, the radiation efficiency stabilized at around 85%.