Measurement of dielectric properties of aqueous glucose using planar ring resonator

The Most of affordable daily glucose monitoring techniques in diabetic patients are invasive requiring sample of blood. Microwave sensor can nondestructively measure parameter inside volume. This property suggests that microwave sensor would be well suited for noninvasively measuring blood glucose concentration in human being. After fabricating microwave based noninvasive sensor, at primary stage this sensor is tested with aqueous glucose. A Planar Microstrip Ring Resonator is designed, simulated and implemented to resonate at 1 GHz. Dielectric material is placed above a Microstrip ring resonator. Because of this near field of resonator gets interact with a Material Under Test (MUT) and electrical characteristics of resonator change in relation to the permittivity of the material. Change in the dielectric causes corresponding shift in resonating frequency of Microstrip Patch Antenna. This relationship can be useful to measure Blood Glucose Concentration level. Vector Network Analyzer is used to measure the shift in resonating frequency. The design procedure is described here and experimental results are reported.