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An Innovative Antenna Array with High Inter Element Isolation for Sub-6 GHz 5G MIMO Communication Systems

Alibakhshikenari, Mohammad; S. Virdee, Bal; Benetatos, Harry; Mousa Ali, Esraa; Soruri, Mohammad; Dalarsson, Mariana; Naser-Moghadasi, Mohammad; See, Chan Hwang; Pietrenko-Dabrowska, Anna; Koziel, Slawomir; Szczepanski, Stanislaw; Limiti, Ernesto


Mohammad Alibakhshikenari

Bal S. Virdee

Harry Benetatos

Esraa Mousa Ali

Mohammad Soruri

Mariana Dalarsson

Mohammad Naser-Moghadasi

Anna Pietrenko-Dabrowska

Slawomir Koziel

Stanislaw Szczepanski

Ernesto Limiti


A novel technique is shown to improve the isolation between radiators in antenna arrays. The proposed technique suppresses the surface-wave propagation and reduces substrate loss thereby enhancing the overall performance of the array. This is achieved without affecting the antenna’s footprint. The proposed approach is demonstrated on a four-element array for 5G MIMO applications. Each radiating element in the array is constituted from a 3×3 matrix of interconnected resonant elements. The technique involves (i) incorporating matching stubs within the resonant elements, (ii) framing each of the four-radiating elements inside a dot-wall, and (iii) defecting the ground plane with dielectric slots that are aligned under the dot-walls. Results show that with the proposed approach the impedance bandwidth of the array is increased by 58.82% and the improvement in the average isolation between antennas #1&2, #1&3, #1&4 are 8 dB, 14 dB, 16 dB, and 13 dB, respectively. Moreover, improvement in the antenna gain is 4.2% and the total radiation efficiency is 23.53%. These results confirm the efficacy of the technique. The agreement between the simulated and measured results is excellent. Furthermore, the manufacture of the antenna array using the proposed approach is relatively straightforward and cost effective.

Journal Article Type Article
Acceptance Date May 3, 2022
Online Publication Date May 12, 2022
Publication Date 2022
Deposit Date May 3, 2022
Publicly Available Date May 12, 2022
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 12
Issue 1
Article Number 7907
Keywords Antenna arrays, isolation technique, defected ground plane (DGP), decoupling dot-wall, square ring resonant elements, sub-6 GHz, 5th generation (5G), multiple input multiple output (MIMO)
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