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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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Low-Cost Non-Invasive Microwave Glucose Sensor Based on Dual Complementary Split-Ring Resonator.

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  • 1College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625014, China.

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A novel dual complementary split-ring resonator (DS-CSRR) offers a non-invasive method for monitoring blood glucose. This miniaturized, low-cost microwave sensor achieves high sensitivity, paving the way for improved diabetes management.

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dual complementary split-ring resonator (DS-CSRR)glucose concentrationmicrowave sensornon-invasive

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Area of Science:

  • Microwave Engineering
  • Biosensing Technology
  • Medical Diagnostics

Background:

  • Diabetes management requires continuous blood glucose monitoring.
  • Conventional invasive methods cause inconvenience and discomfort.
  • Non-invasive glucose detection is a significant research area.

Purpose of the Study:

  • To design and fabricate a highly sensitive, miniaturized microwave sensor for non-invasive glucose detection.
  • To address the limitations of low sensitivity and large size in existing microwave glucose sensors.
  • To develop a cost-effective and easily fabricated sensor for personal continuous glucose monitoring.

Main Methods:

  • A dual complementary split-ring resonator (DS-CSRR) operating at 3.3 GHz was designed and fabricated on an FR4 substrate.
  • U-shaped slots were incorporated into the DS-CSRR to enhance electric field interaction and optimize the quality factor (Q).
  • The sensor's performance was evaluated by measuring the transmission coefficient (S21) using a vector network analyzer (VNA) with varying glucose concentrations.

Main Results:

  • The modified DS-CSRR achieved a Q factor of 130 under no-load conditions.
  • A linear frequency shift was observed with increasing glucose concentration.
  • The sensor demonstrated a high sensitivity of 1.95 kHz/(mg·dL⁻¹).

Conclusions:

  • The developed non-invasive microwave sensor exhibits high sensitivity and miniaturization.
  • The sensor's low cost and ease of fabrication make it suitable for personal continuous glucose monitoring.
  • This study provides a valuable design strategy for miniaturized, high-sensitivity microwave biosensors.