Estimation Discrepancies Associated with Different Calculation Methods between Mode-Matching Technique and Finite-Element Method for Dielectric Measurement in Liquids via the Open-ended Cut-off Circular Waveguide Reflection Method

Kouji SHIBATA  Masaki KOBAYASHI  

Publication
C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)   Vol.J101-C   No.7   pp.282-286
Publication Date: 2018/07/01
Online ISSN: 1881-0217
DOI: 
Type of Manuscript: LETTER
Category: 
Keyword: 
complex permittivity,  dielectric measurement,  coaxial line,  

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Summary: 
The finite element method was applied to measure the complex permittivity in liquids via the cut-off circular waveguide reflection method using the comparison formula with a reference material. At this time, the difference of the estimated complex permittivity due to the difference in the calculation method of S11 was obtained. As a result, the difference from the set value of the estimated value of the complex permittivity was +0.15% in the real part and -0.63% in the imaginary part, respectively when assuming the measurement of tap water at 0.50 GHz. Furthermore, the difference between the estimated value and the set value when assuming ethanol was +0.68% in the real part and -4.28% in the imaginary part, respectively.