Characterization of complex permittivity properties of materials in rectangular waveguides using a hybrid iterative method

In many microwave applications, an accurate knowledge of the complex permit tivity properties of materials is usually required. A new procedure for the accurate determination of these properties is presented, based tn an optim ization algorithm that makes use of measured scattering parameters and simu lated results of a cylindrical rod of dielectric material passing completel y through a rectangular waveguide. The simulation tool employed consists of a very accurate hybrid iterative method, Results for the permittivity prop erties of ethanol (high-loss liquid material) are presented and validated w ith results from the literature.