General formulation of unconditionally stable ADI-FDTD method in linear dispersive media

Author

Dong, X.T. ; Venkatarayalu, N.V. ; Guo, B. ; Yin, W.Y. ; Gan, Y.B.

Author_Institution

Ternasek Labs., Nat. Univ. of Singapore, Singapore

Volume

52

Issue

1

fYear

2004

Firstpage

170

Lastpage

174

Abstract

The unconditionally stable alternating-direction-implicit-finite-difference time-domain (ADI-FDTD) method is used to model wave propagation in dispersive media. A formulation is presented by introducing the Z-transform method into the ADI-FDTD scheme to handle the frequency-dependent features of the media. This formulation is applicable to arbitrary dispersive media, and can be easily coded. Numerical results are compared to those based on the conventional FDTD method to show the efficiency of the proposed method.

Keywords

Laplace transforms; Z transforms; computational electromagnetics; dispersive media; electromagnetic wave propagation; finite difference time-domain analysis; Laplace domain constitutive relation; Z-transform; alternating-direction-implicit-FDTD method; arbitrary dispersive media; discrete difference formula; frequency-dependent features; homogeneous plasma; linear dispersive media; perfectly matched layer; plane wave; radar cross section; unconditionally stable ADI-FDTD method; wave propagation; Dispersion; Electromagnetic scattering; Equations; Finite difference methods; Frequency; Gallium nitride; Helium; Permittivity; Polynomials; Time domain analysis;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2003.821269

Filename

1262689