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Open AccessArticle

Microfluidic Microwave Sensor for Detecting Saline in Biological Range

Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Author to whom correspondence should be addressed.
Sensors 2019, 19(4), 819;
Received: 17 December 2018 / Revised: 4 February 2019 / Accepted: 12 February 2019 / Published: 17 February 2019
A device for measuring biological small volume liquid samples in real time is appealing. One way to achieve this is by using a microwave sensor based on reflection measurement. A prototype sensor was manufactured from low cost printed circuit board (PCB) combined with a microfluidic channel made of polymethylsiloxane (PDMS). Such a sensor was simulated, manufactured, and tested including a vacuum powered sample delivery system with robust fluidic ports. The sensor had a broad frequency band from 150 kHz to 6 GHz with three resonance frequencies applied in sensing. As a proof of concept, the sensor was able to detect a NaCl content of 125 to 155 mmol in water, which is the typical concentration in healthy human blood plasma. View Full-Text
Keywords: lab-on-a-chip; RF sensor; microfluidic sensing; IDE lab-on-a-chip; RF sensor; microfluidic sensing; IDE
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MDPI and ACS Style

Kilpijärvi, J.; Halonen, N.; Juuti, J.; Hannu, J. Microfluidic Microwave Sensor for Detecting Saline in Biological Range. Sensors 2019, 19, 819.

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