Microwave sensor for non‐invasive glucose measurements design and implementation of a novel linear

In this paper, a novel non‐invasive sensor for the measurement of the glucose concentrations in blood is presented. By using a microstrip band pass filter, a wireless sensor is achieved. In the introduced design, the thumb is placed on the structure of the filter as a superstrate. The response of the filter is dependent on the permittivity of the superstrate. A compact size, linearity and cost effectiveness are the most important advantages of the proposed sensor. The linear behaviour of the filter in terms of the frequency is investigated and for a linear behaviour, a certain frequency for operation is selected. The introduced sensor can be used by diabetics for continuous self‐monitoring of the glucose level. The structure of the proposed sensor is designed on the low‐cost substrate, FR4, by compact dimensions of 50 mm × 40 mm × 1.6 mm. A prototype of the proposed filter was fabricated and the performance of the filter was investigated, experimentally.