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High loss liquid dielectric characterization: Comparison of microwave waveguide and resonator measurement techniques

Published online by Cambridge University Press:  29 May 2020

Z. E. Eremenko Open the ORCID record for Z. E. Eremenko [Opens in a new window] ,
A. I. Shubnyi ,
A. Y. Kogut  and
R. S. Dolia Open the ORCID record for R. S. Dolia [Opens in a new window]
Z. E. Eremenko*
Affiliation:
O. Ya. Usykov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
A. I. Shubnyi
Affiliation:
O. Ya. Usykov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
A. Y. Kogut
Affiliation:
O. Ya. Usykov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
R. S. Dolia
Affiliation:
O. Ya. Usykov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
*
Author for correspondence: Z. E. Eremenko, E-mail: zoya.eremenko@gmail.com
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Abstract

The microwave waveguide and resonator methods are compared as applied to the experimental determination of the dielectric properties of high loss liquids. A differential microwave waveguide cavity for measuring high loss liquids complex permittivity in a small volume has been designed and studied. This cavity consists of two circular waveguide cells with central rods made of quartz and surrounded by high loss liquid tested. The cells have different lengths to eliminate complex propagation coefficient measurement errors due to the diffraction effect on the ends of the layered waveguide cells. We have measured the wave amplitude and phase coefficients for the waveguide cavity to estimate physical properties of a high loss liquid under test. The resonant frequencies and the Q-factor of a semi-disk dielectric resonator with high loss liquid filling a capillary have been measured. We have selected water-ethanol solutions as a high loss liquid under test for both techniques. We have determined the measurement sensitivity for these two techniques. The measuring results are discussed. Both the waveguide and resonator methods provide comparable sensitivity and can be successfully used for the complex permittivity characterization of high loss liquids in small volumes.

Keywords

Complex propagation coefficienthigh loss liquidmicrowavesresonatorwater-ethanol solutionwaveguide
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 9: EuMCE 2019 Special Issue (Part I) , November 2020 , pp. 892 - 899
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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