The radiation from an infinite line current source located in a cylindrical electromagnetic bandgap (EBG) structure is analyzed using a semi-analytical method based on the cylindrical Floquet mode expansion. The cylindrical EBG structure consists of parallel metallic rods periodically distributed in the concentrically or eccentrically layered cylindrical geometry. The transmission spectra of the cylindrical structure and the radiation patterns of the line source are numerically investigated.
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