Waveguide Measurements of the Permittivity and Permeability at Temperatures of up to 1000 $^{\circ}\hbox {C}$

This paper describes a method to measure the permittivity and permeability at temperatures from room temperature up to 1000°C 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 reference planes, the thermal expansion of the waveguide, and the gap between the sample and the waveguide wall. Measurements on Macor and NiZn ferrite samples are performed in order to evaluate the performance of the setup and the procedure that is used to determine the permittivity and permeability from the measured S-parameters.