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Mutual coupling reduction with a wideband planar decoupling structure for UWB–MIMO antennas

Published online by Cambridge University Press:  04 July 2018

Alaa H. Radhi Open the ORCID record for Alaa H. Radhi [Opens in a new window] ,
R. Nilavalan ,
Yi Wang ,
H. S. Al-Raweshidy ,
Amira A. Eltokhy  and
Nur Ab Aziz
Alaa H. Radhi*
Affiliation:
College of Engineering, Design & Physical Science, Brunel University, London, UK
R. Nilavalan
Affiliation:
College of Engineering, Design & Physical Science, Brunel University, London, UK
Yi Wang
Affiliation:
Department of Engineering Science, University of Greenwich, Chatham Maritime, Kent, UK
H. S. Al-Raweshidy
Affiliation:
College of Engineering, Design & Physical Science, Brunel University, London, UK
Amira A. Eltokhy
Affiliation:
Department of Engineering Science, University of Greenwich, Chatham Maritime, Kent, UK
Nur Ab Aziz
Affiliation:
College of Engineering, Design & Physical Science, Brunel University, London, UK
*
Author for correspondence: Alaa H. Radhi, E-mail: Alaa.Radhi@brunel.ac.uk
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Abstract

A new planar multiple-input–multiple-output (MIMO) antenna for ultra wideband (UWB) applications is presented. The proposed antenna operates over the frequency band from 3.1 to 10.6 GHz and it consists of two identical circular monopoles on an FR4 substrate. The wide isolation is achieved through a novel planar decoupling structure that is being inserted between the dual antennas. Moreover, a center slot is etched on the common ground to further increase isolation. The effectiveness of the decoupling structure is analyzed, and performance study has been performed to investigate the mutual coupling reduction. A good isolation of more than 31 dB has been achieved through the entire UWB band (more than 12 dB improvement over the reference antenna). The proposed UWB antenna with and without the wideband decoupling structure has been investigated and verified both numerically and experimentally. The measurement results of the proposed UWB–MIMO antenna are in good agreement with the simulation results. The proposed UWB antenna has been compared with previous works regarding antenna size, geometric complexity, bandwidth, and isolation level. The proposed antenna has some outstanding characteristics such as a geometric simplicity, compact size, broad bandwidth, and low correlation which give the antenna an excellent diversity performance and a good candidate for UWB applications.

Keywords

Monopoles antennamultiple-input–multiple-output (MIMO)mutual coupling reductionultra wideband (UWB)
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 10 , December 2018 , pp. 1143 - 1154
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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