Passive Wireless Sensor Utilizing an Interdigital Capacitor for Ongoing Monitoring of Glucose Concentration.

The wireless glucose sensor represents a major step forward in continuous glucose monitoring. With its innovative interdigital capacitor and inductor combination, the sensor works without active components and can measure glucose levels by detecting changes in reflection magnitude of the surrounding environment. Experimental results validated the proposed passive sensor's capability in detecting glucose concentration in aqueous solution, demonstrating a linear relationship between reflection magnitude and glucose concentration ranging from 0 to 500 mg/dL with a sensitivity of 3×10 dB/(mg/dL). These findings make the proposed sensor a good option for continuous glucose monitoring, offering wireless measurement of blood glucose levels. Additionally, its compact size and absence of active components make it suitable for implantable applications, providing individuals with wireless invasive method of monitoring their glucose levels.