Measurement of the dielectric properties of paratellurite at microwaves using a biconical resonator

Abstract

The results of measurements of the dielectric parameters of TeO₂ samples in the microwave range are presented. The measurements were carried out in X-band by the cavity perturbation method using a measuring setup based on a biconical resonator. The advantages of using a high-Q biconical resonator for measuring the dielectric parameters of a paratellurite sample are considered. The determination of the dielectric parameters of the samples is based on finite element computational model and using digital method for determining the natural frequency by fractional rational approximation of the frequency response. The influence of the deviation of the sample shape from the cylindrical on the resonator parameters and the measurement error is considered. The estimate of the dielectric constant of TeO₂ in the crystallographic direction [110] was 24.4, the dielectric loss factor such as tanδ is estimated as 3·10^-4. The results obtained are in good agreement with the reference results presented in the scientific literature.