TIME-DOMAIN MEASUREMENT OF THE ELECTROMAGNETIC PROPERTIES OF MATERIALS

A time-domain measurement and data-reduction technique is presented th at can yield the broad-band frequency-dependent values of a sample mat erial's electrical properties (complex permittivity and permeability), The method uses the material's response to the spectral content of a fast rise-time pulse to determine the frequency dependence of the comp lex relative permittivity (epsilon(r)) and permeability (mu(r)) The me asurement procedure and data-reduction scheme are described, and the d erived material values for a sample material; are given; The advantage s of this method include a potentially lower equipment cost and the av oidance of awkward calibration procedures that are inherent in frequen cy-domain methods. Though the material examined was nonmagnetic, the p rocedure is general and rigorous (for low-loss materials, low dispersi on over the bandwidth) for the determination of both electrical and ma gnetic properties.