Microwave microfluidic sensor based on a microstrip splitter/combiner configuration and split ring resonators (SRRs) for dielectric characterization of liquids
Vélez Rasero, Paris (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Su, Lijuan (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Grenier, Katia (Centre National de la Recherche Scientifique (França))
Mata Contreras, Francisco Javier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Dubuc, David (Centre National de la Recherche Scientifique (França))
Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Data:	2017
Resum:	A microwave microfluidic sensor for dielectric characterization of liquids in real time is presented in this paper. The sensor is implemented in microstrip technology and consists of a symmetric splitter/combiner configuration loaded with a pair of identical split ring resonators (SRRs) and microfluidic channels placed on top of them (gap region). The sensor works in differential mode and sensing is based on frequency splitting. Thus, if the structure is unloaded or if it is symmetrically loaded with regard to the axial plane, only one transmission zero (notch) in the frequency response appears. However, if the axial symmetry is disrupted (e. g. , by the presence of different liquids in the channels), two transmission zeros arise, and the difference in magnitude (notch depth) and frequency between such transmission zeros is indicative of the difference in the dielectric properties (complex dielectric constant). A circuit schematic, including transmission line sections to describe the distributed components, lumped elements to account for the SRRs and their coupling to the lines and lumped elements to model the liquid properties, is presented and validated. After proper calibration, the functionality of the proposed sensor is demonstrated by measuring the complex permittivity in solutions of deionized water and ethanol as a function of the ethanol content.
Ajuts:	Ministerio de Economía y Competitividad TEC2013-40600-R Ministerio de Economía y Competitividad TEC2016-75650-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-157
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Sensor phenomena and characterization ; Resonators ; Transmission line measurements ; Resonant frequency ; Microwave circuits ; Microfluidics
Publicat a:	IEEE sensors journal, Vol. 17 issue 20 (2017) , p. 6589-6598, ISSN 1530-437X

DOI: 10.1109/JSEN.2017.2747764

Post-print 11 p, 1.2 MB

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