Broadband Characterization of Complex Periodic EBG Structures:An FDTD/Prony Technique Based on the Split-Field Approach

Abstract

The main challenge in this paper is to provide an efficient and powerful computational engine to effectively characterize the performance of periodic electromagnetic band-gap (EBG) structures composed of complex scatterers of dielectrics and conductors of arbitrary configurations. The finite difference time domain (FDTD) full wave analysis technique with periodic boundary conditions/perfectly matched layers (PBCs/PMLs) integrated with the Prony method is applied to accurately obtain the interactions of EM waves with the periodic band-gap structures and detail their broadband behaviors. The split-field approach is used to discretize the Floquet-transformed Maxwell's equations derived in the periodic structures. The developed engine is successfully applied to characterize and create insight into the electromagnetic performances of different classes of challenging EBG structures in the areas of frequency selective surfaces (FSSs), dielectric band-gap materials, and left-handed (LH) composite meta-materials. It is demonstrated that the FDTD/Prony technique utilizing the split-field approach is a very useful method in analyzing complex periodic electromagnetic band-gap structures.