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Low-profile closely coupled dual-band MIMO antenna using double layer metasurface

Published online by Cambridge University Press:  10 February 2023

Dayu Qiao
Affiliation:
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, China
Liping Han*
Affiliation:
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, China
Yufeng Liu
Affiliation:
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, China
Wenmei Zhang
Affiliation:
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, China
Member, IEEE
Affiliation:
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, China
*
Author for correspondence: Liping Han, E-mail: hlp@sxu.edu.cn

Abstract

A two-element low-profile closely coupled dual-band MIMO antenna is demonstrated for WiMAX applications. Based on the principle of metasurface (MTS) decoupling, a double-layer MTS consisting of pairs of elliptic patches with two different sizes is proposed. The MTS is loaded above a coupled dual-band MIMO antenna, and the mutual coupling in the lower and upper band is reduced by the larger and smaller elliptic patches, respectively. The edge-to-edge distance of antenna elements is only 0.01λ0 (λ0 is the free-space wavelength at 2.6 GHz). The measured results show that the working bandwidths of the MIMO antenna are 2.5–2.69 and 3.4–3.69 GHz. The −10 dB impedance bandwidths in two bands are 8.83% (2.49–2.72 GHz) and 8.50% (3.38–3.68 GHz), and the isolation between antenna elements is enhanced by 13.5 and 18.4 dB in two bands, respectively. Moreover, broadside radiation performances in two bands are obtained.

Type
Metamaterials andPhotonic Bandgap Structures
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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