Universitat Autònoma de Barcelona
2019
A microstrip defect ground structure (DGS) based on a pair of dumbbell-shaped slots is used for sensing. The device is a differential sensor consisting of a pair of mirrored lines loaded with a dumbbell-shaped DGS, and the output variable is the cross-mode transmission coefficient. Such a variable is very sensitive to asymmetries in the line pair, e.g., caused by an asymmetric dielectric load in the dumbbell-shaped DGSs. Therefore, the sensor is of special interest for the dielectric characterization of solids and liquids, or for the measurement of variables related to complex permittivity changes. It is shown in this work that by adding fluidic channels on top of the dumbbell-shaped DGSs, the device is useful for liquid characterization, particularly for the measurement of solute concentration in very diluted solutions. A sensitivity analysis useful for sensor design is carried out in this paper.
Article
English
Microwave sensors; Differential sensors; Fluidic sensors; Dielectric characterization; Microstrip Technology; Defect ground structure
Agencia Estatal de Investigación TEC2016-75650-R
Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1159
Sensors (Basel, Switzerland) ; Vol. 19, issue 14 (July 2019), art. 3189
open access
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