Analysis of Radiation from Line Source Located in Cylindrical Electromagnetic Bandgap Structures with Defects

Kiyotoshi YASUMOTO
Young-Ki CHO

IEICE TRANSACTIONS on Electronics   Vol.E94-C    No.8    pp.1245-1252
Publication Date: 2011/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1245
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
cylindrical arrays,  radiation,  periodic structures,  reflection and transmission matrices,  

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A semi-analytical approach for analyzing the electromagnetic radiation of a line source in cylindrical electromagnetic bandgap (EBG) structure is presented. The cylindrical structure is composed of circular rods periodically distributed along concentrically layered circular rings. The method uses the T-matrix of a circular rod in isolation, the reflection and transmission matrices of a cylindrical array expressed in terms of the cylindrical waves as the basis, and the generalized reflection and transmission matrices for a layered cylindrical structure. Using the proposed method, the radiated field from a line source placed inside a three-layered cylindrical EBG structure with defects is investigated. The defects are created by removing the particular circular rods from each circular ring. The structure is prominent from the viewpoint of flexible design of the directive antennas. Numerical examples demonstrate that the cylindrical EBG structures are very effective at forming and controlling the directed beam in the radiated fields.