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Modified Split Ring Resonators Sensor for Accurate Complex Permittivity Measurements of Solid Dielectrics.

Amer Abbood Al-Behadili1,2, Iulia Andreea Mocanu1, Norocel Codreanu3

  • 1Department of Telecommunication, Telecommunications and Information Technology, Faculty of Electronics, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania.

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Summary

A novel sensor utilizing modified Split Ring Resonators (SRRs) accurately measures solid dielectric permittivity. This advanced sensor design offers improved sensitivity and reliable results for various materials.

Keywords:
RF absorbing materialsSplit Ring Resonatordielectrics measurementsmetamaterialsnon-invasiveplanar sensor

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Area of Science:

  • Electromagnetics
  • Materials Science
  • Sensor Technology

Background:

  • Accurate characterization of dielectric properties is crucial for electronic applications.
  • Split Ring Resonators (SRRs) are effective electromagnetic structures for sensing.
  • Existing SRR designs may have limitations in sensitivity or frequency range.

Purpose of the Study:

  • To design, simulate, fabricate, and validate a modified SRR sensor for precise measurement of solid dielectric permittivity.
  • To investigate the impact of geometric modifications on sensor performance and resonant frequencies.
  • To develop a mathematical model for extracting permittivity values from sensor measurements.

Main Methods:

  • Modification of SRR geometry by adding vertical strips to create dual resonant frequencies.
  • Full-wave electromagnetic simulations to analyze unloaded and loaded sensor characteristics.
  • Fabrication of the sensor on an FR-4 substrate and experimental validation with various dielectric materials.
  • Development of a curve-fitting based mathematical model for permittivity calculation.

Main Results:

  • The modified SRR exhibits two resonant frequencies at 1.24 GHz and 2.08 GHz, enhancing sensitivity.
  • Analytical relations were derived for the real and imaginary parts of permittivity based on thickness and quality factor.
  • Experimental measurements on glass, acrylic, plexiglass, and Teflon showed high accuracy with <4.5% error.
  • The second resonant frequency proved valuable for measurements where the first was limited by numerical constraints.

Conclusions:

  • The modified SRR sensor provides a sensitive, accurate, and easily implementable solution for dielectric permittivity measurements.
  • The dual-frequency capability expands the applicability of SRR-based sensors.
  • The developed mathematical model enables precise extraction of material properties.