FDTD EVALUATION OF SCATTERING BY METALLIC OBJECTS IN GTEM CELLS

The finite difference time domain (FDTD) technique, developed in a pol ar coordinate system, is used to analyse the scattering by metallic ob jects in a gigahertz transverse electromagnetic (GTEM) cell. The advan tage of using the FDTD method is the noticeable mathematical simplific ation, with respect to the analytical approach, which allows one to tr eat general structures and electrical characteristics without further analytical effort, and use of computer resources. The analysis has bee n carried out both at discrete frequencies, to compare our results wit h those in the literature, and with pulse sources to extract, by means of a discrete Fourier transform, the frequency domain behaviour of th e system. The measurements inside the GTEM cell show a good correlatio n with those made in anechoic chambers.