Abstract:
In this study we present a microwave sensor based on the quadratic-shape designed for detecting glucose concentration in aqueous solutions by using a microwave near-field electromagnetic interaction technique. We derived linear relationship between microwave $\mathrm{S}_{11}$ reflection coefficient of our suggested system and concentration of glucose in solution. Due to that linear relationship we could determine the glucose concentration in the $0$–$250\,mg/dL$ concentration range at an operating frequency near $3.6\, GHz$. The measured minimum detectable signal was $0.0044\,dB/(mg/dL)$ and the measured minimum detectable concentration was $6.8\, mg/dL$. These results suggest that our proposed system has a high accuracy for non-contact glucose monitoring and has good basis for the development of a non-invasive glucometer.
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