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Four-Element/Eight-Port MIMO Antenna System with Diversity and Desirable Radiation for Sub 6 GHz Modern 5G Smartphones

Parchin, Naser Ojaroudi; Amar, Ahmed S.I.; Darwish, Mohammad; Moussa, Karim H.; See, Chan Hwang; Abd-Alhameed, Raed A.; Alwadai, Norah Muhammad; Mohamed, Heba G.

Authors

Ahmed S.I. Amar

Mohammad Darwish

Karim H. Moussa

Raed A. Abd-Alhameed

Norah Muhammad Alwadai

Heba G. Mohamed



Abstract

In this manuscript, a multiple-input multiple-output (MIMO) antenna array system with identical compact antenna elements providing wide radiation and diversity function is introduced for sub 6 GHz fifth-generation (5G) cellular applications. The introduced design contains four pairs of miniaturized square-loop resonators with dual-polarization and independently coupled T-shaped feed lines which have been placed symmetrically at the edge corners of the smartphone mainboard with an overall size of 75 mm × 150 mm. Therefore, in total, the introduced array design encompasses four pairs of horizontally and vertically polarized resonators. The elements are very compact and utilize at 3.6 GHz, a potential 5G candidate band. In order to improve the frequency bandwidth and radiation coverage, a square slot has been placed and excited under each loop resonator. Desirable isolation has been observed for the adjacent elements without any decoupling structures. Therefore, they can be considered self-isolated elements. The presented smartphone antenna not only exhibits desirable radiation but also supports different polarizations at various sides of the printed circuit board (PCB). It exhibits good bandwidth of 400 MHz (3.4-3.8 GHz), high-gain patterns, improved radiation coverage, and low ECC/TARC (better than 0.004 and -30 dB at 3.6 GHz, respectively). Experimental measurements were conducted on an array manufactured on a standard smartphone board. The simulated properties of this MIMO array are compared with the measurements, and it is found that they are in good agreement. Furthermore, the introduced smartphone array offers adequate efficiency in both the user interface and components integrated into the device. As a result, it could be suitable for 5G handheld devices.

Journal Article Type Article
Acceptance Date Nov 29, 2022
Online Publication Date Dec 6, 2022
Publication Date 2022
Deposit Date Nov 30, 2022
Publicly Available Date Dec 6, 2022
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 10
Pages 133037-133051
DOI https://doi.org/10.1109/access.2022.3227199
Keywords 5G; loop resonators; MIMO; mobile communications; smartphone antenna
Public URL http://researchrepository.napier.ac.uk/Output/2967852

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