Compact Sub-6-GHz Four-Element MIMO Slot Antenna System for 5G Tablet Devices

Shu-Chuan Chen; Lung-Chi Chou; Chung-I. G. Hsu; Sheng-Min Li

doi:10.1109/ACCESS.2020.3016649

IEEE Access (Jan 2020)

Compact Sub-6-GHz Four-Element MIMO Slot Antenna System for 5G Tablet Devices

Shu-Chuan Chen,
Lung-Chi Chou,
Chung-I. G. Hsu,
Sheng-Min Li

Affiliations

Shu-Chuan Chen: ORCiD; Electrical and Electronic Engineering Department, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan
Lung-Chi Chou: ORCiD; Electrical Engineering Department, National Yunlin University of Science and Technology, Douliu, Taiwan
Chung-I. G. Hsu: ORCiD; Electronic Systems Research Division, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan
Sheng-Min Li: ORCiD; Electrical and Electronic Engineering Department, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan

DOI: https://doi.org/10.1109/ACCESS.2020.3016649
Journal volume & issue: Vol. 8
pp. 154652 – 154662

Abstract

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A sub-6-GHz four-element multi-input multi-output (MIMO) slot antenna system was proposed in this study for fifth-generation (5G) tablet computers, where each antenna element was constructed using a slot structure. To effectively use the available space in a tablet and maximize the screen, we have deployed the MIMO antenna system on the left side-edge frame of the tablet. The MIMO antenna system measuring 37.2 × 7 mm2 consists of two identical 13.6 × 7 mm2 dual-slot-antenna units that are separated by 10 mm. The two closely spaced slot antennas in the same dual-slot-antenna unit are arranged asymmetrically mirrored of each other with respect to the system ground plane. Although the dual-slot-antenna unit is very compact, the isolation between the two slot antennas in the same unit can be enhanced by using an ungrounded full-wavelength strip resonator. With the two ungrounded resonators in the MIMO slot antenna system, the simulated intra-unit isolations at the mid-band frequency can be enhanced by about 3.5 dB to meet the design requirement. As a byproduct, the two ungrounded resonators in the MIMO antenna system can also enhance the simulated mid-band antenna efficiency by about 4.5% and lower the worst simulated ECC by 0.195, from 0.518 to 0.323. This MIMO antenna system can support the frequency band of 3400- 3600 MHz for 5G. In the operating band, the measured isolation is larger than 11 dB, and the measured antenna efficiency is larger than 40%. The envelope correlation coefficients (ECCs) calculated from the measured complex E-field radiation patterns are all smaller than 0.23, making the proposed design suitable for 5G mobile communications that require fast transmission.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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