Dual-Band Dual-Polarized Antenna Based on TDLS Metasurface for 4G/5G Base Station Applications
Y. Chen, Л. Ф. Черногор, Yu Zheng, Zhejun Jin, Zhongsen Sun, Zhao Yao, Cong Wang, Tian Liu
Abstract
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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.46\lambda _{0}$ </tex-math></inline-formula> and planar reflector at the bottom is <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.77\lambda _{0}\times 0.77\lambda _{0}$ </tex-math></inline-formula> (where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula> 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$63.5^{\circ }\pm 6.6^{\circ }$ </tex-math></inline-formula> , and the isolation is more splendid than 30 dB. Eventually, the radiation efficiency stabilized at around 85%.