Microfluidic Microwave Sensor for Detecting Saline in Biological Range
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Updated: Jan 29, 2026

Bacterial Detection & Identification Using Electrochemical Sensors
Published on: April 23, 2013
Joni Kilpijärvi1, Niina Halonen2, Jari Juuti3
1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland. joni.kilpijarvi@oulu.fi.
Abstract:
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.
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