Abstract
This paper describes a modified open-ended coaxial technique for microwave dielectric characterization in liquid media. A calibration model is developed to relate the measured transmission coefficient to the local properties of the sample under test. As a demonstration, the permittivity of different sodium chloride solutions is experimentally determined. Accuracies of 0.17% and 0.19% are obtained respectively for the real and imaginary parts of dielectric permittivity at 5.9 GHz.
Highlights
As a versatile tool for measuring the real and imaginary parts of the complex permittivity of dielectric materials, the open-ended coaxial probe has found widespread use in biomedical and food applications [1]
A novel approach based on the combination of the coaxial line method and an interferometric technique is proposed for the electromagnetic characterization of materials
To complete the test bench, a data processing unit is used to control the position of the sample, to tune and record the transmission coefficient T measured by the vector network analyzer (VNA)
Summary
As a versatile tool for measuring the real and imaginary parts of the complex permittivity of dielectric materials, the open-ended coaxial probe has found widespread use in biomedical and food applications [1]. A novel approach based on the combination of the coaxial line method and an interferometric technique is proposed for the electromagnetic characterization of materials. An experimental study related to the detection and evaluation of small concentrations of sodium chloride in aqueous medium shows that the proposed technique is at the state of art in terms of operating frequency range, sensitivity and measurement accuracy. The permittivity of different sodium chloride (NaCl) aqueous solutions is experimentally extracted
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