Title :
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
fDate :
2/1/1997 12:00:00 AM
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
