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

1
Department of Electronic and Telecommunications Engineering, Instituto Tecnológico Metropolitano, Medellín 050012, Colombia
2
Department of Mechatronics and Electromechanical Engineering, Instituto Tecnológico Metropolitano, Medellín 050034, Colombia
3
Department of Electrical and Electronic Engineering, Universidad Tecnologica de Bolivar, Cartagena 130001, Colombia
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(8), 1936; https://doi.org/10.3390/s19081936
Received: 12 March 2019 / Revised: 9 April 2019 / Accepted: 18 April 2019 / Published: 25 April 2019
(This article belongs to the Special Issue Antenna Technologies for Microwave Sensors)
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Abstract

This work presents a non-invasive, reusable and submersible permittivity sensor that uses a microwave technique for the dielectric characterization of liquid materials. The proposed device consists of a compact split ring resonator excited by two integrated monopole antennas. The sensing principle is based on the notch introduced by the resonators in the transmission coefficient, which is affected due to the introduction of the sensor in a new liquid material. Then, a frequency shift of the notch and the Q-factor of the proposed sensor are related with the changes in the surrounding medium. By means of a particular experimental procedure, commercial liquids are employed to obtain the calibration curve. Thus, a mathematical equation is obtained to extract the dielectric permittivity of liquid materials with unknown dielectric properties. A good match between simulated and experimental results is obtained, as well as a high Q-factor, compact size, good sensitivity and high repeatability for use in sensing applications. Sensors like the one here presented could lead to promising solutions for characterizing materials, particularly in determining material properties and quality in the food industry, bio-sensing and other applications. View Full-Text
Keywords: microwave sensor; split ring resonator; permittivity measurements; material characterization; metamaterial microwave sensor; split ring resonator; permittivity measurements; material characterization; metamaterial
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Reyes-Vera, E.; Acevedo-Osorio, G.; Arias-Correa, M.; Senior, D.E. A Submersible Printed Sensor Based on a Monopole-Coupled Split Ring Resonator for Permittivity Characterization. Sensors 2019, 19, 1936.

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