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The paper describes the measuring cell based on a gap-coupled multi-modes coaxial resonator. The role of coupling effect in forming the spectra of longitudinal odd modes has been analyzed using the circuit model of the gap-coupled resonator. The relative dielectric constant εr′ and the loss tangent tanδ of a material under test are derived from the measured input reflectance employing the least-square...
The article describes a sensor based on the resonant monopole antenna and its application for dielectric properties measurement. Generally, the sensor can be used in microwave characterization of various material but the article is focused on sensing liquids, powdered and granular materials for which the sensor can be plunged into medium under test without special mechanical treatment (or adjusting)...
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