A novel multimodal technique for the unique and simultaneous determination of material permittivity and permeability

A waveguide multimodal measurement technique which enables the unique and simultaneous determination of both permittivity and permeability of a material sample is presented. It is based on the simultaneous excitation of two degenerate TE and TM modes in a waveguide section homogeneously filled with the material sample. A multiple coaxial to waveguide transition has been designed as a coupling structure. Symmetries in the transition are used to independently excite and measure different propagating modes in the waveguide. The permittivity and permeability of different material samples have been determined using the proposed technique. Comparison to simulations and other measurement techniques shows excellent agreement.