Filtering and transmission properties of Electromagnetic Band Gap structures with periodicity interruptions

The introduction of defects in an electromagnetic band-gap (EBG) material breaks its periodicity, and produces interface states of the electromagnetic field, at frequencies within the stop-bands, manifested by sharp peaks in the transmission response of the structure. We study EBGs properties in the presence of multiple periodicity interruptions, by using a full-wave approach. Results are presented for TE and TM polarizations, showing the transmission efficiencies as a function of the involved parameters. We discuss how the selectivity and the position of the transmission peaks inside the stop-band can be controlled. We show that a pass-band filtering behavior can also be obtained.