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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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A Linear and High-Sensitivity Microwave Biosensor on a FR-4 Substrate for Aqueous Glucose Monitoring Using a

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This study introduces a novel microwave biosensor for non-invasive glucose monitoring. The compact, dual-band sensor offers accurate, label-free detection of glucose concentrations, addressing key challenges in diabetes management.

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diabeteslabel-free glucose sensingmicrowave biosensorplanar biosensorsplit-ring resonator (SRR)ultra-wideband (UWB) biosensing

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Area of Science:

  • Biomedical Engineering
  • Microwave Engineering
  • Sensor Technology

Background:

  • Non-invasive glucose monitoring is crucial for diabetes management but faces limitations in accuracy and cost.
  • Existing methods often require invasive procedures or lack precision.
  • Microwave biosensors present a promising label-free alternative due to their sensitivity to dielectric changes.

Purpose of the Study:

  • To develop and validate a compact, dual-band microwave biosensor for accurate, label-free glucose detection.
  • To investigate the sensor's performance using a split-ring resonator (SRR-type) design on a low-cost substrate.
  • To assess the sensor's suitability for practical applications in diabetes management.

Main Methods:

  • Fabrication of a concentric square-shaped SRR-type biosensor on an FR-4 substrate.
  • Utilizing electric field confinement to detect glucose-induced permittivity changes.
  • Measuring shifts in resonance frequency and reflection coefficient for glucose quantification.
  • Operating the sensor in the UWB-adjacent band (2.76-3.25 GHz).

Main Results:

  • Demonstrated a linear and monotonic response for glucose concentrations up to 250 mg/dL.
  • Achieved high frequency-domain sensitivity (1.964 MHz/(mg/dL)) and amplitude-domain sensitivity (0.0332 dB/(mg/dL)).
  • Obtained excellent coefficients of determination (R² > 0.9927) and a normalized size of 0.137 λg².

Conclusions:

  • The proposed compact SRR-type biosensor offers a sensitive and accurate method for label-free glucose monitoring.
  • The PCB-compatible design provides a practical, reproducible solution for next-generation diabetes management tools.
  • This technology holds potential for advancing non-invasive glucose monitoring systems.