Akademik Veri Yönetim Sistemi
IEEE Sensors Journal, cilt.23, sa.18, ss.21246-21253, 2023 (SCI-Expanded)
A novel dual band microwave sensor for non-invasive detection of glucose concentration is presented. The proposed sensor consists of an open loop resonator coupled to the input and the output of the structure. The resonator is loaded with a modified split ring resonators for dual band operation as sensing area. The open loop resonator with electric coupling operating at low band functions as host. The SRRs embedded into the open loop resonator operates at high band. In the proposed sensor, the overall size is miniaturized using the embedded resonator structure. This configuration has two transmission poles and one transmission zero in transmission coefficients, which are all sensitive to glucose level variation. A dielectric container made with 3D printer is used for dropping the aqueous glucose samples on the sensing section of the sensor. The experimental results obtained from prototype having a dielectric container shows two resonance frequencies at 1.8 GHz and 2.67 GHz as well as a transmission zero at 2.32GHz. Glucose solution with deionized water in the range from 89 mg/dL to 456 mg/dL is used in the measurements. For this range of glucose concentrations, the experimental frequency resolutions are 0.78 MHz / (mg/dL) and 0.95 MHz / (mg/dL) based on the transmission pole and the transmission zero, respectively.