کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Systematic Analysis of Dual-Substrate and Geometry Effects in Triple-Pole Resonator-Based Microwave Biosensors for Non-Invasive Glucose Monitoring

نویسندگان :

Sina Aramtan¹ Hasti Enayattarighehkari² Gholamreza Moradi³

1- Amirkabir University of Technology 2- Amirkabir University of Technology 3- Amirkabir University of Technology

کلمات کلیدی :

microwave sensing،metamaterials،SRR،non-invasive glucose sensing،dielectric characterization

چکیده :

This work presents the design and optimization of a high-performance triple-pole split-ring resonator (SRR) sensor for non-invasive glucose detection. A conventional triple-pole CSRR-based structure was first re-evaluated under dual-substrate loading and was found to exhibit degraded resonance depth and quality factor due to strong capacitive sensitivity to dielectric stacking. Motivated by this limitation, the sensor was redesigned using an SRR topology while preserving the overall geometry to ensure a fair comparison. A dual-substrate configuration was then optimized through a systematic study of substrate material, thickness, and resonator geometry. The final structure, consisting of a double-ring SRR and a thin RT5880 upper substrate (0.26 mm), demonstrated significant improvements in resonance sharpness and Q-factor. A Debye-based dielectric model was employed to extract the frequency-dependent permittivity of aqueous glucose solutions between 10 and 200 mg/dL. A layered finger model, including skin and blood tissues, was constructed to evaluate non-invasive operation. Electric-field analysis confirmed strong field confinement at the resonator surface with sufficient penetration into the blood layer. The proposed sensor exhibits a clear and monotonic amplitude variation with glucose concentration, yielding an amplitude sensitivity of approximately 0.0125 dB/(mg/dL), well within the resolution of standard VNAs. These results demonstrate that the optimized SRR dual-substrate configuration offers a promising platform for compact, non-invasive glucose monitoring systems.