Spurious fields in time-domain computations of scattering problems

Author

Kangro, Urve ; Nicolaides, Roy

Author_Institution

Dept. of Math. Sci., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

45

Issue

2

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

228

Lastpage

234

Abstract

Two-dimensional (2-D) electromagnetic scattering problems with a time-periodic incident field are considered. The scatterer is a perfect conductor, and an artificial boundary condition is used. The large-time behavior of solutions, depending on (divergence-free) initial conditions, is characterized. It turns out that in addition to the expected time-periodic solution, the limiting solution may also contain a spurious stationary field. The source of the stationary field is explained and equations describing it are obtained. Several avoidance strategies are discussed and numerical comparisons of these techniques are given

Keywords

Maxwell equations; electromagnetic fields; electromagnetic wave scattering; time-domain analysis; 2D EM scattering problems; artificial boundary condition; divergence free initial conditions; large-time behavior; limiting solution; perfect conductor; spurious stationary field; stationary field source; time marching Maxwell´s equations; time periodic solution; time-domain computations; time-periodic incident field; Boundary conditions; Conductors; Magnetic fields; Maxwell equations; Numerical analysis; Radar cross section; Radar scattering; Time domain analysis; Two dimensional displays; Uncertainty;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.560341

Filename

560341