Compact Size, and Highly Sensitive, Microwave Sensor for Non-Invasive Measurement of Blood Glucose Level

None-invasive blood glucose measurement enables effective diagnosis and treatment of diabetic patients. The existing microwave sensors suffer from low sensitivity large size. This article presents a highly sensitive compact size non-invasive sensor for real-time measurements. We have developed new sensing technique using directly connected Branch Line Coupler Split Ring Resonators. significantly improves the by mitigating limited coupling between transmission lines resonators. In addition, Resonators reduces due to capacitive inductive effects, which are loaded Coupler. proposed function is based on shifting notch frequency in coupled arm Coupler, caused loading with varying concentration. A prototype fabricated successfully tested several concentrations deionized water. Experimental results demonstrate 0.72 MHz/mgdL -1 sensitivity, higher comparison available PCB technology. 3.5×3.5×0.16 cm xmlns:xlink="http://www.w3.org/1999/xlink">3 .