Implementation and application of resistive sheet boundary condition in the finite-difference time-domain method (EM scattering)

Abstract

Use of resistive sheet boundary condition in the finite-difference time-domain (FDTD) analysis of scattering problems involving resistively coated dielectric object is described. The algorithm is introduced through an analysis of E-polarized scattering from a thin resistive strip. For the sheetIn the following, the analysis technique is first derived for a two-dimensional E-polarized scattering problem of a thin resistive strip. The numerical stability issue of the method is also discussed. The FDTD technique is validated by COmparresistance R = qZo /Z with 2, being the intrinsic impedance of vacuum, numerical experiments indicate that algorithm stability is ensured in all cases if 6t is chosen according to cqbt 5 6. Validity of the resultant FDTD method is verified in a comparison of computed E-polarized scattering data for several resistive strips with existing data. New results on the E-polarized scattering behavior of resistively coated dielectric strip as a function of surface resistances and angle of incidence are also presented. Finally, extension to the If-polarized case and application of the present method to pulsed problems are briefly discussed.

Efficient modelling of thin conducting sheets within the TLM method

“…Other thin layer models have been derived for the Finite Difference Time-Domain method. A vast majority of this work is concerned with perfect conductors, for example Kunz et al [5], or infinitely thin sheets, Wu and Han [6]. Other methods such as those described by Maloney [7,8], and Luebbers [9] primarily consider the modelling of thin conducting sheets of relatively low conductivity.…”

Comments on "The efficient modeling of thin material sheets in the finite-difference time-domain (FDTD) method" [with reply]

“…The validity of formula (1) was discussed experimentally in detail [3] and also theoretically [4]. This very simple formula and its modified version, shown below, were applied to the target imaging as the inverse problem to a considerable extent [5]-[lo].…”

A 4-component 2-D CFDFD method with equivalent SIBC for multilayer metal-coated coaxial waveguide

“…The coating layer affects the propagation performance of electromagnetic waves, especially the attenuation and the dissipated power, therefore it has to be taken into account when analyzing multilayer metal-coated coaxial waveguide. Among many available full-wave methods [1][2][3][4][5][6][7] , the 2-D CFDFD method involving only four transverse field components with frequency as input parameter which needs less CPU time and memory space has been employed to analyze the phase constant of a general transmission line [8] . Further more, the method with the implementation of surface-impedance boundary condition in reference [9] [10] was applied to lossy circular metal waveguide and lossy coaxial metal waveguide.…”