Comment on "Calibration-independent measurement of complex permittivity of liquids using a coaxial transmission line" [Rev. Sci. Instrum. 86, 014704 (2015)]

In this letter, we comment on the applicability of the derived characteristic equation (Eq. (7)) in a recently published article of Guoxin [Rev. Sci. Instrum. 86, 014704 (2015)]. To validate our comment, we first derive another characteristic function for determination of complex permittivity of die...

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Bibliographic Details
Published in:Review of scientific instruments 2015-07, Vol.86 (7), p.077101-077101
Main Authors: Hasar, U C, Barroso, J J
Format: Article
Language:English
Subjects:
Calibration
Characteristic functions
Complex permittivity
Configurations
Dielectrics
Eigenvalues
Eigenvectors
Permittivity
Plugs
Scientific apparatus & instruments
Transmission lines
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Summary:In this letter, we comment on the applicability of the derived characteristic equation (Eq. (7)) in a recently published article of Guoxin [Rev. Sci. Instrum. 86, 014704 (2015)]. To validate our comment, we first derive another characteristic function for determination of complex permittivity of dielectric materials for the configurations considered in the above article using calibration-independent uncorrected S-parameters for transmission-line measurements (coaxial-line, waveguide, free-space, etc). Unlike the characteristic equation in this article, the characteristic equation derived here for determination of the complex permittivity of liquid samples does not require any knowledge about the complex permittivity of plugs, used for holding liquid samples in place. We then performed 3-D full-wave simulations for the measurement configurations presented in Guoxin's article for substantiation of the characteristic equation derived in this letter.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4926595