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Spurious fields in time-domain computations of scattering problems

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2 Author(s)
Kangro, U. ; Dept. of Math. Sci., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Nicolaides, R.

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

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Antennas and Propagation, IEEE Transactions on  (Volume:45 ,  Issue: 2 )