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Published in

MDPI, Micromachines, 1(13), p. 136, 2022

DOI: 10.3390/mi13010136

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Minimized Triple-Band Eight-Element Antenna Array for 5G Metal-frame Smartphone Applications

Journal article published in 2022 by Jianlin Huang, Zhuoni Chen, Qibo Cai, Tian Hong Loh ORCID, Gui Liu
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A multiple-input-multiple-output (MIMO) antenna array for triple-band 5G metal-frame smartphone applications is proposed in this paper. Each single antenna element consists of an S-shaped feeding strip and an L-shaped radiation strip on the metal frame. The dimension of the antenna element is only 6.5 mm × 7 mm (0.076 λ0 × 0.082 λ0, λ0 is the free-space wavelength at the frequency of 3.5 GHz). The −6 dB impedance bandwidth of the proposed eight-antenna array can cover 3.3–3.8 GHz, 4.8–5 GHz, and 5.15–5.925 GHz. The evolution design and the analysis of the optimal parameters for a single antenna element are derived to investigate the principle of the antenna. The measured total efficiency is larger than 70%. The measured isolation is better than 13 dB. The measurements of the prototype agree well with the simulation results.