Permittivity measurement under free space propagation

Standard permittivity measurement techniques require samples to meet strict requirements regarding size, shape, surface roughness etc. This paper proposes a novel free space measurement technique which avoids these limitations. The technique iteratively solves a Method of Moments (MoM) scattering problem in order to obtain the permittivity. A novel calibration technique is used which significantly reduces the computation cost of the forward solver and which accounts for differences between the real world measurement apparatus and the simulations. Encouraging preliminary results are given.