Permittivity and permeability determination for high index specimens using partially filled shorted rectangular waveguides

A method for determining the permittivity and permeability for specimens with high refractive index and variable shape is investigated. The method extracts the permeability and permittivity tensor elements from reflection measurements made with a partially-filled shorted rectangular waveguide on an electrically small specimen. Measurements are performed for two isotropic, heavily loaded coaxial magnetic composites. Supporting measurements from a stripline cavity and coaxial airline are used to validate the method. The results demonstrate the methods ability to handle frequency dispersive and high index materials. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1298–1301, 2016