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JCM 2023 Vol.18(12): 790-799
Doi: 10.12720/jcm.18.12.790-799

A Compact Two-Port Handset MIMO Antenna with High Isolation for 5G mm-Wave Applications

Watheq A. Neamah1, 2 *, Haider M. Al Sabbagh1, and Hussain Al-Riz3
1.Department of Electrical Engineering, College of Engineering, University of Basrah, Basrah, Iraq
2.College of Engineering, University of Thi-Qar, Iraq
3.Department of Systems Engineering, University of Arkansas University Little Rock, Little Rock, AR, USA
* Correspondence: watheq.neamah@utq.edu.iq (W.A.N.)

Manuscript received July 21, 2023; revised August 22, 2023, accepted September 10, 2023.

Abstract—In this paper, a novel design of a compact coplanar waveguide (CPW) fed multiple-input-multiple-output (MIMO) handset antenna operating in a wide frequency range at the 5G New Radio (NR) millimeter wave (mmWave) band extending from 23.5 GHz to 41 GHz. The planar geometry results in a small, compact structure with a wide operating bandwidth, high gain, and high radiation efficiency. The utilized antenna was a single-layer surface-mounted CPW in a pin-clamp-like (PCL) structure fed with a wide ground slot. The two-element MIMO antenna consists of closely-spaced parallel elements placed λ0/16 apart from the closest edge, wherein λ0 is the free space wavelength at the 28 GHz operating frequency. A novel inverse S-shaped (IS) decoupling strip structure was used. The proposed antenna element was designed on a Rogers RT5870 substrate using CST Microwave Studio and further validated using Ansys HFSS software. The simulated frequency bandwidth was confined to (23.5-41) GHz, showing both software good agreement results. At 37 GHz, the antenna array provides a maximum simulated gain of 6.6 dBi, while its lowest was 1.5 dBi at 24 GHz, and its minimum radiation efficiency was 93% over the whole band. This array revealed excellent MIMO performance metrics, such as envelope correlation coefficient ECC, diversity gain DG, and mean effective gain MEG, of excellent results, making this array a good choice for emerging 5G communications applications.

Keywords—Two ports, MIMO, 5G, mmWave, high isolation, ECC

Cite: Watheq A. Neamah, Haider M. Al Sabbagh, and Hussain Al-Rizzo, “A Compact Two-Port Handset MIMO Antenna with High Isolation for 5G mm-Wave Applications," Journal of Communications, vol. 18, no. 12, pp. 790-799, December 2023. Doi: 10.12720/jcm.18.12.790-799

Copyright © 2023 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.