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Microstrip Patch Sensor for Characterizing Saline Solution Based on Complimentary Split-Ring Resonators (SC-SRRs).

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Summary

This study introduces a novel microstrip patch sensor for precisely measuring the complex permittivity of saline solutions. The sensor offers high sensitivity for applications in agriculture and medicine.

Keywords:
complex permittivityconductivitymicrostrip patch sensorparts per thousand (ppt)single complementary split-ring resonance

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Area of Science:

  • Electromagnetics
  • Sensor Technology
  • Materials Science

Background:

  • Complex permittivity is crucial for characterizing liquids.
  • Microstrip patch sensors offer non-contact measurement capabilities.
  • Saline solutions require accurate permittivity determination for various applications.

Purpose of the Study:

  • To develop and validate a novel microstrip patch sensor for measuring the complex permittivity of saline solutions.
  • To investigate the sensor's performance across a salinity range of 0 to 100 ppt.
  • To establish numerical equations for predicting conductivity, dielectric constant, and concentration.

Main Methods:

  • Design of a microstrip patch sensor with four single complementary split-ring resonators (SC-SRR).
  • Utilizing a high-frequency structure simulator (HFSS) for sensor design.
  • Fabrication using a computer numerical control (CNC) machine and FR-4 substrate with a Teflon box.
  • Operation based on the turbulence technique, analyzing resonant properties (resonant frequency, reflection coefficient S11, quality factor Q).

Main Results:

  • The sensor demonstrated high sensitivity in non-contact and non-destructive measurements.
  • Measurement and simulation results showed excellent agreement with theoretical models (Klien and Meissner, Debye models).
  • Derived numerical equations for conductivity, dielectric constant, and concentration showed good agreement with experimental data.

Conclusions:

  • The proposed SC-SRR microstrip patch sensor is effective for determining the complex permittivity of saline solutions.
  • The sensor's performance indicates suitability for agricultural (freshwater identification) and medical (salinity detection in biological fluids) applications.
  • The sensor provides a reliable method for analyzing mixed liquids and identifying diseases based on salt concentration.