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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 164107, 11 pages
Research Article

On the Suppression Band and Bandgap of Planar Electromagnetic Bandgap Structures

Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ON, Canada

Received 17 June 2013; Revised 16 September 2013; Accepted 19 September 2013; Published 2 January 2014

Academic Editor: Stefano Selleri

Copyright © 2014 Baharak Mohajer-Iravani and Omar M. Ramahi. 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.


Electromagnetic bandgap structures are considered a viable solution for the problem of switching noise in printed circuit boards and packages. Less attention, however, has been given to whether or not the introduction of EBGs affects the EMI potential of the circuit to couple unwanted energy to neighboring layers or interconnects. In this paper, we show that the bandgap of EBG structures, as generated using the Brillouin diagram, does not necessarily correspond to the suppression bandwidth typically generated using S-parameters. We show that the reactive near fields radiating from openings within the EBG layers can be substantial and are present in the entire frequency band including propagating and nonpropagating mode regions. These fields decay fast with distance; however, they can couple significant energy to adjacent layers and to signal lines. The findings are validated using full-wave three-dimensional numerical simulation. Based on this work, design guidelines for EBG structures can be drawn to insure not only suppression of switching noise but also minimization of EMI and insuring signal integrity.