Open Access

ARTICLE

A Compact Self-Isolated MIMO Antenna System for 5G Mobile Terminals

Muhannad Y. Muhsin^1,*, Ali J. Salim², Jawad K. Ali²
1 Microwave Research Group, Department of Electrical Engineering, University of Technology, Baghdad, 10001, Iraq
2 Microwave Research Group, Department of Communication Engineering, University of Technology, Baghdad, 10001, Iraq
* Corresponding Author: Muhannad Y. Muhsin. Email:
(This article belongs to this Special Issue: Emergent Topics in Intelligent Computing and Communication Engineering)

Computer Systems Science and Engineering 2022, 42(3), 919-934. https://doi.org/10.32604/csse.2022.023102

Received 27 August 2021; Accepted 28 September 2021; Issue published 08 February 2022

Abstract

A compact self-isolated Multi Input Multi Output (MIMO) antenna array is presented for 5G mobile phone devices. The proposed antenna system is operating at the 3.5 GHz band (3400–3600 MHz) and consists of eight antenna elements placed along two side edges of a mobile device, which meets the current trend requirements of full-screen smartphone devices. Each antenna element is divided into two parts, a front part and back part. The front part consists of an I-shaped feeding line and a modified Hilbert fractal monopole antenna, whereas the back part is an L-shaped element shorted to the system ground by a 0.5 mm short stub. A desirable compactness can be obtained by utilizing the Hilbert space-filling property where the antenna element’s overall planar size printed on the side-edge frame is just (9.57 mm × 5.99 mm). The proposed MIMO antenna system has been simulated, analyzed, fabricated and tested. Based on the self-isolated property, good isolation (better than 15 dB) is attained without employing additional decoupling elements and/or isolation techniques, which increases system complexity and reduces the antenna efficiency. The scattering parameters, antenna efficiencies, antenna gains, and antenna radiation characteristics are investigated to assess the proposed antenna performance. For evaluating the proposed antenna array system performance, the Envelope Correlation Coefficients (ECCs), Mean Effective Gains (MEGs) and channel capacity are calculated. Desirable antenna and MIMO performances are evaluated to confirm the suitability of the proposed MIMO antenna system for 5G mobile terminals.

---

Keywords

5G applications; compact antennas; isolation techniques; MIMO antennas; mobile terminals; self-isolated antennas

---