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Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

Ojaroudi Parchin, Naser; Jahanbakhsh Basherlou, Haleh; I. A. Al-Yasir, Yasir; M. Abdulkhaleq, Ahmed; A. Abd-Alhameed, Raed

Authors

Haleh Jahanbakhsh Basherlou

Yasir I. A. Al-Yasir

Ahmed M. Abdulkhaleq

Raed A. Abd-Alhameed



Abstract

A new ultra-wideband (UWB) multiple-input/multiple-output (MIMO) antenna system is proposed for future smartphones. The structure of the design comprises four identical pairs of compact microstrip-fed slot antennas with polarization diversity function that are placed symmetrically at different edge corners of the smartphone mainboard. Each antenna pair consists of an open-ended circular-ring slot radiator fed by two independently semi-arc-shaped microstrip-feeding lines exhibiting the polarization diversity characteristic. Therefore, in total, the proposed smartphone antenna design contains four horizontally-polarized and four vertically-polarized elements. The characteristics of the single-element dual-polarized UWB antenna and the proposed UWB-MIMO smartphone antenna are examined while using both experimental and simulated results. An impedance bandwidth of 2.5–10.2 GHz with 121% fractional bandwidth (FBW) is achieved for each element. However, for S11 ≤ −6 dB, this value is more than 130% (2.2–11 GHz). The proposed UWB-MIMO smartphone antenna system offers good isolation, dual-polarized function, full radiation coverage, and sufficient efficiency. Besides, the calculated diversity performances of the design in terms of the envelope correlation coefficient (ECC) and total active reflection coefficient (TARC) are very low over the entire operating band.

Journal Article Type Article
Acceptance Date Apr 14, 2020
Online Publication Date Apr 22, 2020
Publication Date 2020
Deposit Date Feb 21, 2022
Publicly Available Date Feb 21, 2022
Journal Sensors
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 20
Issue 8
Article Number 2371
DOI https://doi.org/10.3390/s20082371
Keywords double-fed slot antenna; MIMO system; mobile terminals; polarization diversity; UWB technology
Public URL http://researchrepository.napier.ac.uk/Output/2840245

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