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A modified field model of waveguide reflection dielectric resonator for microwave measurements of dielectric properties

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1 Author(s)
Jyh Sheen ; Department of Electronic Engineering, National Formosa University, Hu-Wei, Yun-Lin 632, Taiwan

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A modified electromagnetic field model of a waveguide reflection dielectric resonator is suggested for measurements of dielectric properties of the homogeneous and isotropic medium in the microwave frequencies. Reflection signal is measured for the calculations of dielectric properties. A dielectric rod sample is put inside of a rectangular cavity made by a microwave waveguide. The sample’s dielectric constant and loss tangent are computed from the unloaded quality factor and the resonant frequency of the TE01δ mode as well as the structure dimensions. For first time, this waveguide reflection dielectric resonator is applied on dielectric constant measurement. A modified field model of the waveguide reflection resonator is developed from the Itoh-Rudokas model [IEEE Trans. Microwave Theory Tech. MTT-25, 52 (1977)] of the parallel-plate dielectric resonator. This modification is justified by the dramatic improvement in the accuracy of dielectric constant measurements. The main merit of this field model is that it provides very simple electromagnetic field expressions of this TE01δ field mode. In addition, accuracies of various methods for calculating the power factor and conducting loss, which have never been given before, will be investigated in this article.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 3 )