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International Journal of Antennas and Propagation
Volume 2011, Article ID 237454, 6 pages
http://dx.doi.org/10.1155/2011/237454
Research Article

A Compact Low-Permittivity Dual-Layer EBG Structure for Mutual Coupling Reduction

1Islamic Azad University, Parand Branch, Tehran, Iran
2Islamic Azad University, Dezful Branch, Dezful, Iran

Received 15 February 2011; Revised 13 April 2011; Accepted 9 June 2011

Academic Editor: Hoi Shun Lui

Copyright © 2011 A. Azarbar and J. Ghalibafan. 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.

Abstract

Electromagnetic bandgap (EBG) structures can help in the reduction of mutual coupling by their capabilities of suppressing surface wave's propagation in a specific frequency range. In this work, a dual-layer EBG structure, which had a lower resonant frequency than the single-layer one, is proposed in order to reduce the mutual coupling between 𝐸 -plane coupled microstrip antenna array. As this EBG structure significantly made the series capacitance between neighbor cells larger, a drastic reduction of the unit cell size was achieved. The simulated and experimental results show that the proposed structure has a significant 19 dB mutual coupling reduction.