Response Sharpening of Resonant Sensors for Potential Applications in Blood Glucose Monitoring

A method to improve the response resolution of microwave biomedical resonant sensors is discussed. Resonant sensors often do not show very sharp resonance peak, due also to losses which reduce the quality factor. Moreover, since the sensor response is collected over a discrete set of frequencies, the actual resonance peak may not be properly captured. To overcome these drawbacks, an algorithm is presented in this paper which aims at sharpening the microwave sensors response, and mitigating the mentioned frequency discretization problem so to eventually estimate the resonance frequency more accurately. The algorithm is first explained and checked against synthetic data mimicking the response of a resonant sensor. Then, as a further validation, measured data collected by a microwave resonant sensor, properly designed for blood glucose monitoring, just located in contact to human fingers are considered.