Table of Contents
International Journal of Microwave Science and Technology
Volume 2010 (2010), Article ID 297519, 5 pages
http://dx.doi.org/10.1155/2010/297519
Research Article

Reduction of Mutual Coupling and Return Loss in Microstrip Array Antennas Using Concave Rectangular Patches

Faculty of Electrical and Computer Engineering, The University of Sistan and Baluchestan, Zahedan 9816745563, Iran

Received 1 September 2010; Revised 13 November 2010; Accepted 17 December 2010

Academic Editor: Samir Trabelsi

Copyright © 2010 Shahram Mohanna et al. 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

An effective solution to reduce both the mutual coupling and return loss of a microstrip array antenna consisting of rectangular patches is proposed. The patch is made concave in both horizontal and vertical sides. Applying the proposed structure to a microstrip array antenna having two elements, the effects of patch concavity on the mutual coupling and return loss are simulated and studied. To obtain a concave rectangular patch array antenna having low amounts of mutual coupling and return loss, the patch length and width as well as the amounts of concavities are optimized using an enhanced genetic algorithm. To verify the simulation results, then, the optimal array antenna is fabricated. The simulation and experimental results confirm that the optimal concave rectangular array antenna has low amounts of mutual coupling and return loss.