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A Submersible Printed Sensor Based on a Monopole-Coupled Split Ring Resonator for Permittivity Characterization.

Erick Reyes-Vera¹, G Acevedo-Osorio², Mauricio Arias-Correa³

¹Department of Electronic and Telecommunications Engineering, Instituto Tecnológico Metropolitano, Medellín 050012, Colombia. erickreyes@itm.edu.co.

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|April 28, 2019

Summary

This study introduces a novel microwave permittivity sensor for non-invasive dielectric characterization of liquids. The reusable, submersible sensor offers high sensitivity and repeatability for material analysis.

Keywords:

material characterization metamaterial microwave sensor permittivity measurements split ring resonator

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Area of Science:

Electrical Engineering
Materials Science
Applied Physics

Background:

Dielectric characterization is crucial for material analysis in various industries.
Existing methods for liquid material characterization can be invasive or lack reusability.
Development of compact, non-invasive sensors is needed for real-time material property determination.

Purpose of the Study:

To present a novel, non-invasive, reusable, and submersible permittivity sensor.
To demonstrate the sensor's capability for dielectric characterization of liquid materials using microwave techniques.
To establish a method for extracting dielectric permittivity of unknown liquids.

Main Methods:

A compact split-ring resonator excited by monopole antennas was designed and fabricated.
The sensing principle relies on the frequency shift and Q-factor changes in the transmission coefficient due to liquid dielectric properties.
Calibration curves were generated using commercial liquids to establish a mathematical model.

Main Results:

The sensor demonstrated a high Q-factor, compact size, good sensitivity, and high repeatability.
Simulated and experimental results showed good agreement.
A mathematical equation was derived to accurately determine the dielectric permittivity of unknown liquid materials.

Conclusions:

The proposed microwave permittivity sensor is a promising solution for non-invasive material characterization.
The sensor's design and performance make it suitable for applications in the food industry, bio-sensing, and quality control.
This technology facilitates accurate determination of material properties in diverse liquid-based applications.