A Modified Single Metamaterial Split-Ring Resonator for Enhanced Sensitivity

Area of Science:

• Microwave Engineering
• Biosensing Technology
• Metamaterial Applications

Background:

• Accurate glucose monitoring is crucial for diabetes management.
• Existing biosensors face limitations in sensitivity and detection range.
• Metamaterial-based sensors offer potential for enhanced performance.

Purpose of the Study:

• To develop and characterize a novel microwave biosensor for enhanced glucose sensing.
• To investigate the impact of structural modifications on sensor sensitivity.
• To evaluate the sensor's performance for practical blood glucose monitoring.

Main Methods:

• Design and simulation of a metamaterial asymmetric split-ring resonator (SASR) biosensor.
• Fabrication on Rogers AD350A substrate with single (SASR-S) and double (SASR-D) semi-circular designs.
• Electromagnetic simulation and experimental validation using a vector network analyzer.

Main Results:

• The SASR-D configuration demonstrated higher sensitivity due to enlarged sensing area and hotspots.
• Measured sensitivity of SASR-D reached approximately 2.4 MHz/(mg/dL), a two-fold improvement over SASR-S.
• The sensor effectively detected glucose concentrations from 97 mg/dL to 286 mg/dL.

Conclusions:

• The double semi-circular metamaterial biosensor design significantly enhances glucose detection sensitivity.
• The proposed sensor offers a practical and improved solution for blood glucose monitoring.
• Further development could lead to more advanced diagnostic tools.