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International Journal of Antennas and Propagation
Volume 2018, Article ID 4814176, 13 pages
Research Article

Mutual Coupling Reduction of E-Shaped MIMO Antenna with Matrix of C-Shaped Resonators

1Electronic Department, Technical Institute-Mosul, 00964 Mosul, Iraq
2Department of Electrical-Electronics Engineering, University of Gaziantep, 27310 Gaziantep, Turkey

Correspondence should be addressed to Gölge Ögücü Yetkin; moc.liamg@ucugo.eglog

Received 31 July 2017; Revised 8 December 2017; Accepted 19 December 2017; Published 18 February 2018

Academic Editor: Yuan Yao

Copyright © 2018 Raghad Ghalib Saadallah Alsultan and Gölge Ögücü Yetkin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


E-shaped multiple-input-multiple-output (MIMO) microstrip antenna systems operating in WLAN and WiMAX bands (between 5 and 7.5 GHz) are proposed with enhanced isolation features. The systems are comprised of two antennas that are placed parallel and orthogonal to each other, respectively. According to the simulation results, the operating frequency of the MIMO antenna system is 6.3 GHz, and mutual coupling is below −18 dB in a parallel arrangement, whereas they are 6.4 GHz and −25 dB, respectively, in the orthogonal arrangement. The 2 × 3 matrix of C-shaped resonator (CSR) is proposed and placed between the antenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. More than 30 dB isolation between the array elements is achieved at the resonant frequency for both of the configurations. The essential parameters of the MIMO array such as mutual coupling, surface current distribution, envelop correlation coefficient (ECC), diversity gain (DG), and the total efficiency have been simulated to verify the reliability and the validity of the MIMO system in both parallel and orthogonal configurations. The experimental results are also provided and compared for the mutual coupling with simulated results. An adequate match between the measured and simulated results is achieved.