每年出版 12 期
ISSN 打印: 0040-2508
ISSN 在线: 1943-6009
Indexed in
TRANSIENT RESPONSE OF CIRCULAR WAVEGUIDE MODE TO THE CHANGE OF PERMITTIVITY IN THE CORE
摘要
In this paper, the rigorous mathematical approach has been applied to investigate transformations of a guided mode of the circular waveguide due to an abrupt time change of the refractive index of the core. By using an assumption of a sharp time change of the medium parameters the authors obtained an analytical solution in the Laplace transform tern. The inverse transform to the time domain was derived by virtue of the residues theorem and evaluation of integrals along branch cuts of the complex plane. Transient behavior of the processes, steady state regime, possibility of the frequency shift and chance to transform the guided mode into leaky-wave modes have been studied in detail.
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