Ultrahigh-Sensitivity Microwave Sensor for Microfluidic Complex Permittivity Measurement
The conventional resonant-type microwave microfluidic sensors made of planar resonators suffer from limited sensitivities. This is due to the existence of several distributed capacitors in their structure, where just one of them acts as a sensing element. This article proposes a very high-sensitivit...
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| Published in | IEEE transactions on microwave theory and techniques Vol. 67; no. 10; pp. 4269 - 4277 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
New York
IEEE
01.10.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The conventional resonant-type microwave microfluidic sensors made of planar resonators suffer from limited sensitivities. This is due to the existence of several distributed capacitors in their structure, where just one of them acts as a sensing element. This article proposes a very high-sensitivity microwave sensor made of a microstrip transmission line loaded with a shunt-connected series LC resonator. A large sensitivity for dielectric loadings is achieved by incorporating just one capacitor in the resonator structure. Applying sample liquids to the microfluidic channel implemented in the capacitive gap area of the sensor modifies the capacitor value. This is translated to a resonance frequency shift from which the liquid sample is characterized. The sensor performance and working principle are described through a circuit model analysis. Finally, a device prototype is fabricated, and experimental measurements using water/ethanol solutions are presented for verification of the sensing principle. |
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| AbstractList | The conventional resonant-type microwave microfluidic sensors made of planar resonators suffer from limited sensitivities. This is due to the existence of several distributed capacitors in their structure, where just one of them acts as a sensing element. This article proposes a very high-sensitivity microwave sensor made of a microstrip transmission line loaded with a shunt-connected series LC resonator. A large sensitivity for dielectric loadings is achieved by incorporating just one capacitor in the resonator structure. Applying sample liquids to the microfluidic channel implemented in the capacitive gap area of the sensor modifies the capacitor value. This is translated to a resonance frequency shift from which the liquid sample is characterized. The sensor performance and working principle are described through a circuit model analysis. Finally, a device prototype is fabricated, and experimental measurements using water/ethanol solutions are presented for verification of the sensing principle. |
| Author | Ebrahimi, Amir Ghorbani, Kamran Scott, James |
| Author_xml | – sequence: 1 givenname: Amir orcidid: 0000-0002-1787-2230 surname: Ebrahimi fullname: Ebrahimi, Amir email: amir.ebrahimi@rmit.edu.au organization: School of Engineering, Royal Melbourne Institute of Technology (RMIT University), Melbourne, VIC, Australia – sequence: 2 givenname: James orcidid: 0000-0003-3200-6821 surname: Scott fullname: Scott, James organization: School of Engineering, Royal Melbourne Institute of Technology (RMIT University), Melbourne, VIC, Australia – sequence: 3 givenname: Kamran orcidid: 0000-0001-8767-0207 surname: Ghorbani fullname: Ghorbani, Kamran organization: School of Engineering, Royal Melbourne Institute of Technology (RMIT University), Melbourne, VIC, Australia |
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| Snippet | The conventional resonant-type microwave microfluidic sensors made of planar resonators suffer from limited sensitivities. This is due to the existence of... |
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| SubjectTerms | Capacitors Circuits Complex permittivity Dielectric measurement Ethanol Frequency shift Integrated circuit modeling microfluidic sensor Microfluidics Microstrip Microstrip transmission lines microwave sensor Microwave sensors planar resonators Resonators Sensitivity Sensors Transmission lines |
| Title | Ultrahigh-Sensitivity Microwave Sensor for Microfluidic Complex Permittivity Measurement |
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