Determination of the complex permittivity of dielectric materials at microwave frequency using rectangular waveguide measurements and Newton-Raphson methodJ. Terhzaz, H. Ammor, Á. Mediavilla Sánchez, M. Chaïbi and A. MamouniMater. Tech., 94 3 (2006) 227-233DOI: https://doi.org/10.1051/mattech:2006039