Rigorous analysis of dipole source radiation in cylindrical bandgap structures with defects

Periodic dielectric or metallic structures are a subject of continuing interests because of their wide use for practical devices in microwaves and optical waves. Various analytical or numerical techniques have been developed over the years to formulate the electromagnetic scattering from the periodic arrays. However, the previous pertinent efforts have been mostly concerned with the planar periodic arrays. An alternative of the planar configuration is a cylindrical array formed by circular rods periodically distributed on a circular surface. The cylindrical periodic systems referred to as cylindrical electromagnetic bandgap (EBG) structures are being used to the designs of directive antennas, multi-beam or beam-switching antennas. Recently, V. Jandieri and K. Yasumoto have proposed a rigorous semi-analytical approach successfully applied to the analysis of electromagnetic scattering and radiation in cylindrical periodic and bandgap structures.