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Minimized Triple-Band Eight-Element Antenna Array for 5G Metal-frame Smartphone Applications
Jianlin Huang1, Zhuoni Chen1, Qibo Cai1
1College of Electrical and Electronics Engineering, Wenzhou University, Wenzhou 325035, China.
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.
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