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Highly sensitive RF sensor based on microstrip meander line for measuring microfluidics dielectric properties of alcohol–alcohol mixtures

Published online by Cambridge University Press:  18 October 2023

Huan Zou Open the ORCID record for Huan Zou [Opens in a new window] ,
Yiyun Wang ,
Xiaoqin Liu  and
Haiyang Wang
Huan Zou*
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
Yiyun Wang
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
Xiaoqin Liu
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
Haiyang Wang
Affiliation:
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu, Sichuan, China
*
Corresponding author: Huan Zou; Email: hzou82@uestc.edu.cn
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Abstract

In this paper, a radio frequency sensor for measuring microfluidics dielectric properties is designed based on microstrip meander line. The meander sensor replaces the straight transmission lines with meander transmission lines in the part of the half-wavelength path difference to improve the sensitivity of the sensor and reduce its size. According to the experimental results, the meander sensor based on the meander line has higher accuracy and a lower relative error than the straight sensor in measuring methanol–ethanol mixtures with different molar fractions. The relative error measured by the meander sensor after calibration with an adjustable cavity is less than 1%. It is easier to detect the very slight variation in dielectric properties brought about by microfluidics. The detection technique can be further applied for the accurate detection of dielectric properties of valuable biological samples, providing a more concise and convenient way.

Keywords

adjustable cavitydielectric propertymeander lineRF sensor
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 7
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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