Dual-Band Structure Reused Antenna Based on Quasi-Elliptic Bandpass Frequency Selective Surface for 5G Application
Jin Zhang, Shuai Zhang, Gert Frølund Pedersen
Abstract
A dual-band structure-reused antenna with quasi-elliptic bandpass feature is proposed in this communication. The antenna consists of a cavity-backed slot array working at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$K$ </tex-math></inline-formula> -band (24.2–26.1 GHz) and a frequency selective surface (FSS), which is transparent to the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$K$ </tex-math></inline-formula> -band radiation and also reused as a radiator at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula> -band (2.5–2.7 GHz). The FSS unit cells are designed based on the cross-slot structure. By introducing asymmetric boundaries to each unit cell, the FSS obtains high-frequency selectivity with two transmission zeros located on each side of the passband. The proposed antenna is fabricated and measured. The measurements have a good matching with the simulations.