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Microfluidic Microwave Sensor Based on a Twisted Cross-Shaped Structure for Glucose Detection.

Yun Ma1, Chenxi Zhao1, Chaojun Chen1

  • 1School of Electronic Information Engineering, China West Normal University, Nanchong 637009, China.

Sensors (Basel, Switzerland)
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This study introduces a novel microwave sensor for accurate glucose detection, mitigating temperature interference using a microfluidic device. The sensor demonstrates reliable performance for biomedical applications.

Keywords:
glucose detectionmicrofluidicsmicrowave sensor

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Area of Science:

  • Biomedical Engineering
  • Microwave Sensing Technology

Background:

  • Microwave sensors offer potential for glucose detection.
  • Temperature fluctuations negatively impact microwave sensor accuracy.
  • Precise temperature control is crucial for reliable glucose monitoring.

Purpose of the Study:

  • To design a novel microwave sensor for glucose detection with enhanced accuracy.
  • To address the challenge of temperature interference in microwave glucose sensing.
  • To validate the sensor's performance using a microfluidic device for temperature control.

Main Methods:

  • Designed a novel microwave sensor utilizing a twisted cross-shaped structure.
  • Integrated a microfluidic device for precise temperature regulation.
  • Operated the sensor at a frequency of 6900 MHz with a sensitivity of 0.54%.

Main Results:

  • A 0.2 mol/L increase in glucose concentration shifted the resonance frequency by 10-60 MHz at constant temperature.
  • Resonance amplitude of scattering parameter (S21) increased with glucose concentration.
  • A 10 °C temperature increase shifted the resonance frequency by 10-130 MHz at constant glucose concentration.

Conclusions:

  • The novel microwave sensor effectively monitors glucose concentrations.
  • The integrated microfluidic device successfully controls temperature, improving accuracy.
  • This work supports the application of microwave sensors in biomedicine.