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Journal of Electromagnetic Waves and Applications Volume 28, 2014 - Issue 2
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Articles

Using polygonal defect in ground structure to reduce mutual coupling in microstrip array antenna

Ali FarahbakhshCollege of Electrical Engineering, Kerman Graduate University of Technology, kerman, Islamic Republic of IranCorrespondence[email protected]
,
Mohammad MosalanejadElectrical Engineering Department, Amirkabir University of Technology, Tehran, Islamic Republic of Iran
,
GholamReza MoradiElectrical Engineering Department, Amirkabir University of Technology, Tehran, Islamic Republic of Iran
&
Shahram MohannaElectrical Engineering Department, University of Nottingham Malaysia Campus, Semenyih, Malaysia
Pages 194-201 | Received 02 Jul 2013, Accepted 30 Oct 2013, Published online: 22 Nov 2013
 
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Abstract

The surface wave propagation is a significant problem in designing microstrip array antennas that causes the mutual coupling between array elements. There are several methods to suppress this effect and decrease the propagation of surface waves,such as using defected ground structures (DGS). Determining the shape of DGS is the main difficulty when using these structures. In this paper,a new method is proposed to be used in designing array antennas in which the slot shape of DGS in the ground plane of the antenna is assumed to be a polygon, and its shape is obtained by using the enhanced genetic algorithm (GA) and ant colony optimization (ACO). In this case, an array antenna with two elements is designed to work in 9.5 GHz and the gain, return loss and mutual coupling of this antenna is optimized. Finally, the design procedure is verified by simulation and measurement.

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