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Summary

A new compact dielectric sensor detects food adulteration using planar resonators. This miniaturized sensor offers high sensitivity and accuracy for both solid and liquid samples, achieving less than 6% error.

Keywords:
adulterationdielectric permittivityfilterresonatorsensitivitysensor

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Food Science

Background:

  • Dielectric sensors are crucial for analyzing material properties.
  • Existing sensors often lack compactness and efficiency.
  • Adulteration in food samples poses significant health and economic concerns.

Purpose of the Study:

  • To develop a compact dielectric sensor for detecting adulteration in solid and liquid food samples.
  • To miniaturize sensor design while maintaining high performance.
  • To validate the sensor's effectiveness through theoretical and experimental analysis.

Main Methods:

  • Design and optimization of six planar resonator filter prototypes operating at 2.4 GHz.
  • Numerical assessment, fabrication, and experimental validation of filter prototypes.
  • Formulation of a miniaturized filter (35 mm × 35 mm) as a dielectric sensor.
  • Testing sensor sensitivity by analyzing resonant frequency, scattering parameters, phase, and Q factor variations with sample dielectric properties.

Main Results:

  • Achieved experimental results with less than 6% error compared to simulations.
  • Realized significant size reduction: 69% for band stop filters and 75% for band pass filters.
  • Developed a miniaturized sensor with a Q factor of 95 at 2.4 GHz.
  • Demonstrated excellent adulteration detection capabilities for various food samples.

Conclusions:

  • The developed compact dielectric sensor effectively detects food adulteration in solid and liquid forms.
  • The sensor's sensitivity is directly related to the dielectric properties of the tested sample.
  • Miniaturization and high performance were achieved, offering a promising solution for food quality control.