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We present a method aimed at reducing uncertainties and instabilities when characterizing materials in waveguide setups. The S-parameters for a rectangular waveguide loaded with a rectangular sample block are measured for three different sample orientations, and the corresponding geometries are modeled in a finite element program, taking any material parameters as input. The material parameters of...
This paper describes a method to measure the permittivity and permeability at temperatures from room temperature up to 1000 using a single rectangular waveguide. The hardware design of the setup that can handle these temperatures, and the procedure that is required to correct the thermal expansion is developed. This includes the sample displacement, the displacement of the calibration...
The effective properties of a composite material can be predicted using homogenization techniques. In order to verify these predictions, it is common to extract material data from a scattering experiment, where the primary data extracted are wave parameters such as wave number and wave impedance. Using Cramér-Rao lower bounds, we show that in a waveguide setting the wave impedance is ill-determined...
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