Microwave Interferometry Based On Open-ended Coaxial Technique for High Sensitivity Liquid Sensing

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.

Keywords

• permittivity
• electromagntec interaction
• elctromagnetic characterization