Differential microfluidic sensors based on dumbbell-shaped defect ground structures in microstrip technology: Analysis, optimization, and applications

Paris Vélez, Jonathan Muñoz-Enano, Marta Gil, Javier Mata-Contreras, Ferran Martín

Research output: Contribution to journalArticleResearch

27 Citations (Scopus)

Abstract

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. 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.
Original languageEnglish
Article number3189
JournalSensors
Volume19
DOIs
Publication statusPublished - 2 Jul 2019

Keywords

  • Defect ground structure (DGS)
  • Dielectric characterization
  • Differential sensors
  • Fluidic sensors
  • Microstrip technology
  • Microwave sensors

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