Abstract
In order to obtain a unifled approach for the Finite- Difierence Time-Domain (FDTD) analysis of dispersive media described by a variety of models, the coordinate stretched Maxwell's curl equation in time domain is flrstly deduced. Then the FDTD update formulas combined with the semi-analytical recursive convolution (SARC) in Digital Signal Process (DSP) technique for general dispersive media are obtained. In this method, the ∞exibility of FDTD in dealing with complicated object is retained; the advantages of absolute stability, high accuracy, less storage and high efiectiveness of SARC in treating the linear system problem are introduced, and a more unifled update formulation for a variety of dispersion media model including Convolution Perfectly Matched Layers (CPML) absorbing boundary is possessed. Therefore it can be applied to analysis of general dispersive media provided that the poles and corresponding residues in dispersive medium model of interest are given. Finally, three typical kinds of dispersive model, i.e., Debye, Drude and Lorentz medium are tested to demonstrate the feasibility of presented approach.
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