An Ultrahigh Sensitivity Microwave Sensor for Microfluidic Applications

This work shows an ultrahigh sensitivity microwave sensor for microfluidic applications. The proposed sensor is made of a microstrip line loaded with a complementary splitring resonator (CSRR). The meander slot is adopted in the CSRR to achieve high field confinement and is therefore covered with a...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 30; no. 12; pp. 1201 - 1204
Main Authors Fan, Li-Chao, Zhao, Wen-Sheng, Wang, Da-Wei, Liu, Qi, Chen, Shichang, Wang, Gaofeng
Format Journal Article
LanguageEnglish
Published IEEE 01.12.2020
Subjects
Attenuation
Complementary split-ring resonator (CSRR)
liquid
microfluidic sensor
Microfluidics
Microstrip
Microwave sensors
parallel plate waveguide
Permittivity
Sensitivity
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Summary:This work shows an ultrahigh sensitivity microwave sensor for microfluidic applications. The proposed sensor is made of a microstrip line loaded with a complementary splitring resonator (CSRR). The meander slot is adopted in the CSRR to achieve high field confinement and is therefore covered with a polydimethylsiloxane (PDMS) microfluidic channel to enable strong interaction between the field and the liquid sample. The complex permittivity of the liquid sample can be retrieved by the variations in the resonant frequency and peak attenuation. The proposed design requires a very small liquid volume of ~0.5 μL while offering a high sensitivity. A prototype is fabricated and tested, with a good agreement achieved between the extracted values and the reference data.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2020.3029060