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Leaky Dispersion Characteristics in Circular Dielectric Rod Using Davidenko's Method  

Kim Ki Young (School of Electrical Engineering and Computer Science, Kyungpook National University)
Tae Heung-Sik (School of Electrical Engineering and Computer Science, Kyungpook National University)
Lee Jeong-Hae (Department of Radio Science and Communication Engineering, Hongik University)
Publication Information
Journal of electromagnetic engineering and science / v.5, no.2, 2005 , pp. 72-79 More about this Journal
Abstract
The leaky dispersion characteristics of a circular dielectric rod were investigated using Davidenko's method for several lower-order transverse magnetic(TM) modes. The normalized complex propagation constants were precisely determined and their tolerances below $10^{-10}$ compared with zero for both real and imaginary parts. It was also checked whether the normalized complex propagation constants obtained represented forward leaky waves. The leaky modes existing below the cutoff frequency of the guided mode were classified as a nonphysical mode, reactive mode, antenna mode, and spectral gap based on a precise determination of the complex propagation constants. Finally, the effects of the dielectric constant and radius of the dielectric rod on the leaky dispersion characteristics were also considered.
Keywords
Circular Dielectric Rod; Davidenko's Method; Leaky Mode; Normalized Phase Constants; Normalized Attenuation Constants;
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