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Article

Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators

School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
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Author to whom correspondence should be addressed.
Academic Editors: Mohammad Abdolrazzaghi, Vahid Nayyeri and Ferran Martín
Sensors 2021, 21(20), 6811; https://doi.org/10.3390/s21206811
Received: 8 September 2021 / Revised: 6 October 2021 / Accepted: 9 October 2021 / Published: 13 October 2021
(This article belongs to the Special Issue State-of-the-Art Technologies in Microwave Sensors)
In this paper, a very high sensitivity microwave-based planar microfluidic sensor is presented. Sensitivity enhancement is achieved and described theoretically and experimentally by eliminating any extra parasitic capacitance not contributing to the sensing mechanism. The sensor consists of a microstrip transmission line loaded with a series connected shunt LC resonator. A microfluidic channel is attached to the area of the highest electric field concentration. The electric field distribution and, therefore, the resonance characteristics are modified by applying microfluidic dielectric samples to the sensing area. The sensor performance and working principle are described through a circuit model analysis. A device prototype is fabricated, and experimental measurements using water/ethanol and water/methanol solutions are presented for validation of the sensing mathematical model. View Full-Text
Keywords: dielectric measurement; microfluidic sensor; microwave sensor; planar resonators dielectric measurement; microfluidic sensor; microwave sensor; planar resonators
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MDPI and ACS Style

Abdelwahab, H.; Ebrahimi, A.; Tovar-Lopez, F.J.; Beziuk, G.; Ghorbani, K. Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators. Sensors 2021, 21, 6811. https://doi.org/10.3390/s21206811

AMA Style

Abdelwahab H, Ebrahimi A, Tovar-Lopez FJ, Beziuk G, Ghorbani K. Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators. Sensors. 2021; 21(20):6811. https://doi.org/10.3390/s21206811

Chicago/Turabian Style

Abdelwahab, Haneen, Amir Ebrahimi, Francisco J. Tovar-Lopez, Grzegorz Beziuk, and Kamran Ghorbani. 2021. "Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators" Sensors 21, no. 20: 6811. https://doi.org/10.3390/s21206811

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