Abstract
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.
Highlights
Defect ground structures (DGSs) are slot patterns of different shapes that have been exhaustively used in microwave engineering in applications as diverse as filters, antennas, and sensors [1,2,3,4,5,6]
The proposed sensor consists of a pair of mirrored microstrip lines, each one loaded with a dumbbell-shaped DGS transversally oriented to the axis of the lines
We focus on a differential sensor where the output variable is the cross-mode transmission coefficient, but based on a pair of lines loaded with dumbbell-shaped DGSs
Summary
Defect ground structures (DGSs) are slot patterns of different shapes that have been exhaustively used in microwave engineering in applications as diverse as filters, antennas, and sensors [1,2,3,4,5,6]. In the proposed sensor, the working principle is symmetry disruption [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26], rather than frequency variation (the most usual working principle in resonator-based sensors [27,28,29,30,31,32,33,34,35]).
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