volume | PIER Journals

Abstract

This paper deals with the time-domain numerical calculation of electromagnetic (EM) fields in linearly dispersive media described by multipole Debye model. The frequency-dependent finite-difference time-domain (FD²TD) method is applied to solve Debye equations using convolution integrals or by direct integration. Original formulations of FD²TD methods are proposed using different approaches. In the first approach based on the solution of convolution equations, the exponential analytical behavior of the convolution integrand permits an efficient recursive FD²TD solution. In the second approach, derived by circuit theory, the transient equations are directly solved in time domain by the FD²TD method. A comparative analysis of several FD²TD methods in terms of stability, dispersion, computational time and memory is carried out.

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Dr. Mauro Feliziani

Dr. Silvano Cruciani

Dr. Valerio De Santis

Dr. Francesearomana Maradei