A generalized approach for measuring the dielectric properties of lossy composite materials

A generalized technique is presented to measure the dielectric properties of lossy composite materials. The overall method is based on measuring the spectral domain reflection and transmission coefficients of the material-under-test (MUT) using a Vector Network Analyzer (VNA), and then finding the dielectric properties of MUT from the measured scattering data using a proposed reconstruction algorithm. The effect of noise on the reconstruction is examined, and it is observed that even with 5% relative error in the scattering data, the proposed algorithm produces a stable inversion.