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Abstract
A modified form of the time domain electric field integral equation (MFTD-EFIE) is proposed for determining the transient scattering from arbitrarily-shaped conducting bodies. In the analysis, the 2nd time derivative of the magnetic vector potential is approximated with a second-order central finite difference, and the time derivative of the electric scalar potential is averaged over time. The details of an implicit scheme for MFTD-EFIE are also outlined. Owing to the breaking of Courant condition, the method not only behaves efficiently but also yields stable transient responses. Numerical computations are carried out for quite a few conducting structures, such as plate, cube, hemisphere and cone, which demonstrate the accuracy and the efficacy of the proposed method.