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A symmetric bar chart-shape microwave sensor with high Q-factor for permittivity determination of fluidics

Published online by Cambridge University Press:  13 March 2023

Moein Navaei Open the ORCID record for Moein Navaei [Opens in a new window] ,
Pejman Rezaei Open the ORCID record for Pejman Rezaei [Opens in a new window]  and
Sina Kiani
Moein Navaei
Affiliation:
Electrical Engineering, Semnan University, Semnan, Iran
Pejman Rezaei*
Affiliation:
Professor of Electrical Engineering, Semnan University, Semnan, Iran
Sina Kiani
Affiliation:
Electrical Engineering, Semnan University, Semnan, Iran
*
Author for correspondence: Pejman Rezaei, E-mail: [email protected]
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Abstract

This paper introduces a symmetric bar chart-shape (SBCS) microwave sensor for measuring permittivity of fluidic samples. For designing purposes, the introduced sensor was used based on the field changes between the SBCS and rectangular loop microstrip (RLM) structure. When a sample is placed on the sensing location, interaction between SBCS and RLM varies the field intensity. The vinegar samples were combined with water and then they are placed on the sensor. The change in field intensity changes the resonance frequency. However, there is a relationship between the permittivity of samples and the resonance frequencies. The proposed sensor is implemented on the substrate of RO4003C. The relative permittivity of samples changed from 59 to 77 and the resonance frequencies changed from 2.3 to 1.4 GHz. The quality factor is 3544 and the sensitivity is 2.2%.

Keywords

Microwave SensorQ-FactorPermittivity DetectionFluid PermittivityBar Chart Shape
Type
RFID and Sensors
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 8: EuCAP 2022 Special Issue , October 2023 , pp. 1334 - 1342
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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