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http://dx.doi.org/10.12673/jant.2022.26.6.510

High-Sensitivity Microstrip Patch Sensor Antenna for Detecting Concentration of Ethanol-Water Solution in Microliter Volume  

Junho Yeo (School of Artificial Intelligence, Daegu University)
Jong-Ig Lee (Department of Electronics Engineering, Dongseo University)
Publication Information
Journal of Advanced Navigation Technology / v.26, no.6, 2022 , pp. 510-515 More about this Journal
Abstract
In this paper, a microstrip patch sensor antenna (MPSA) for detecting the concentration of an ethanol-water solution in a microliter volume is proposed. A rectangular slot was added at the radiating edge of the patch to increase the sensitivity to the relative permittivity change. To improve a low input resistance caused by placing an ethanol-water solution, which is a polar liquid with high dielectric constant and high loss tangent, on the patch, a quarter-wave impedance transformer was added between the 50-ohm feedline and the patch, and the MPSA was fabricated on a 0.76 mm-thick RF-35 substrate. A cylindrical container was made of acryl, and 15 microliters of the ethanol-water solution was tested from 0% to 100% of ethanol concentration at 20% intervals. Experiment results show that the resonant frequency increased from 1.947 GHz to 2.509 GHz when the ethanol concentration of the ethanol-water solution was increased from 0% to 100%, demonstrating the performance as a concentration detecting sensor.
Keywords
Ethanol concentration; Ethanol-water solution; Liquid sensor; Microliter volume; Microstrip patch antenna;
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Times Cited By KSCI : 4  (Citation Analysis)
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