FVTD applied to dielectric or wire structures

We have used the well known property that curl Maxwell equations for the electric and magnetic fields can be transformed in a condensed equation. For dielectric structures it is assumed that the permittivities have constant values inside the elementary volume cells. As an illustration of the method, we have computed the far scattered field of a dielectric sphere in a transient plane wave. A comparison with results obtained by a time domain integral method is shown. A current injection technique is used to analyse the wire structure, where a wire located above a perfectly conducting plate is fed by a current generator with an infinite impedance. The waveform of the injected current corresponds to a Gaussian pulse. The results of the current along the wire are compared with results obtained when the FDTD method is applied.