Study of the Dispersion Characteristics of One Dimensional EBG with Defects

In this paper we propose a simplified model for studying the Brillouin diagrams based on dielectric multilayers inside a parallel plate waveguide. The main objective of this work is the use of a simplified approach in modelling EBG structures with periodical defects. The effect of layer permittivity, defect length and periodicity were studied using simulation software with appropriated periodical boundary conditions. Physical insights and intuitive justifications for the simulation findings and concepts are also presented. It is shown that the two forbidden band-gaps can either be controlled independently by varying the permittivity or the size of the defects