T-Shaped Patterned Microstrip Line for Noninvasive Continuous Glucose Sensing

In this letter, a microstrip line (MLIN)-based glucose sensor with significant improvement in sensitivity over sensors of the same category is proposed for noninvasive glucose monitoring. It has a T-shaped patterned signal line using the main field of an MLIN for sensing. Glucose under monitoring serves as the substrate of the MLIN. The pattern in the MLIN is designed for enhancing the field interaction in the substrate for improving the sensitivity of the sensor. It achieves much higher sensitivity than that of the state-of-the-art MLIN-based sensors for the same concentrations and comparable sensitivity to resonance-based microstrip sensors with improved robustness. The improvement in sensitivity is validated based on experiments using 0.9% sodium chloride with different glucose concentrations. The robustness is analyzed. The proposed structure is promising for noninvasive continuous glucose monitoring.