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International Journal of Antennas and Propagation
Volume 2013, Article ID 162396, 8 pages
Research Article

Novel Design of Electromagnetic Bandgap Using Fractal Geometry

1School of Electronics and Telecommunications, Hanoi University of Science and Technology, Hanoi 10000, Vietnam
2Department of High Technology, Ministry of Science and Technology, Hanoi 10000, Vietnam
3National Institute of Information and Communications Strategy, Ministry of Information and Communications, Hanoi 10000, Vietnam

Received 7 September 2012; Revised 11 January 2013; Accepted 28 January 2013

Academic Editor: Eric Lheurette

Copyright © 2013 Huynh Nguyen Bao Phuong 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.


A novel electromagnetic bandgap (EBG) structural design based on Fractal geometry is presented in this paper. These Fractals, which are the Sierpinski triangles, are arranged to repeat each 60° to produce the hexagonal unit cells. By changing the gap between two adjacent Sierpinski triangles inside EBG unit cell, we can produce two EBG structures separately that have broadband and dual bandgap. By using the suspending microtrip method, two arrays 3 × 4 of EBG unit cells are utilized to investigate the bandgap of the EBG structures. The EBG operation bandwidth of the broadband structure is about 87% and of the dual-band structure is about 40% and 35% at the center bandgap frequencies, respectively. Moreover, a comparison between the broadband EBG and the conventional mushroom-like EBG has been done. Experimental results of the proposed design show good agreement in comparison with simulation results.