Wideband Optimization Process for EM Characterization of Low-Losses Dielectric and Dispersive Materials in a Quasi-TEM Cell

This paper presents an original wideband method (from 1 MHz to 1 GHz) for the characterization of dielectric and dispersive materials. The method is based on a full-wave calculation technique using the finite-difference time-domain (FDTD) method combined with a fast optimization process. The S-parameters are the metrics which have to be minimized. Only two S-parameters measurements of a quasi-TEM structure with and without the sample under test...