DefinePK

Abstract

A new engineering approach for measuring dielectric properties of materials at K-Band frequencies is developed. The proposed approach is based on applying the rectangular waveguide measurements. The material sample under test (MSUT) is loaded into the K-band rectangular waveguide WR42. The present method is comprised of two parts. The first one concerns the extraction of Scattering Parameters using Ansoft HFSS Solver, then calculate them as a function of the complex permittivity adopting Transmission Matrices (direct problem). The square sums of errors between the simulated and calculated S-parameters are minimized using a nonlinear optimization algorithm. The second part aims to extract the complex relative permittivity from the simulated S-parameters (inverse problem ). An innovative algorithm is developed to look for complex relative permittivity. A comparative study is elaborated, the Nicholson Ross method (NRM) is used to determine the complex relative permittivity of the tested materials in order to compare them with the results obtained using our method. The percentages of errors between the values obtained by NRM and those achieved using our technique are assessed and minimized. The achieved results have demonstrated a good agreement.