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http://dx.doi.org/10.5515/KJKIEES.2018.29.4.247

Noninvasive Method to Distinguish between Glucose and Sodium Chloride Solution Using Complementary Split-Ring Resonator  

Jang, Chorom (Department of Electrical and Electronic Engineering, Yonsei University)
Park, Jin-Kwan (Department of Electrical and Electronic Engineering, Yonsei University)
Yun, Gi-Ho (Department of Information and Communication Engineering, Sungkyul University)
Yook, Jong-Gwan (Department of Electrical and Electronic Engineering, Yonsei University)
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Abstract
In this work, glucose solution and sodium chloride solution were distinguished noninvasively using a microwave complementary split-ring resonator (CSRR). Based on the electrical properties of the two solutions measured using a open-ended coaxial probe, a CSRR was designed and fabricated for operation at a specific frequency that facilitates differentiating the two solutions. Furthermore, a polydimethylsiloxane mold was fabricated to concentrate the solution at a region where the electric field of the resonator was strongest, and a laminating film was used to prevent contact between the solution and resonator. Experiments were performed by dropping $50{\mu}L$ of the solution in steps of 100 mg/dL up to a maximum human blood glucose level of 400 mg/dL. Our experiments confirmed that the transmission coefficients ($S_{21}$) of glucose solution and sodium chloride solution exhibit variations of -0.06 dB and 0.14 dB, respectively, per 100 mg/dL concentration change at the resonance frequency. Thus, the opposite trends in the variation of $S_{21}$ with change in the concentration of the two solutions can be used to distinguish between them.
Keywords
Complimentary Split Ring Resonator; Glucose; Sodium Chloride; Non-Invasive; Discrimination; Microwave Sensor;
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