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Passive Wireless UHF RFID Antenna Label for Sensing Dielectric Properties of Aqueous and Organic Liquids

Makarovaite, V., Hillier, A.J.R., Holder, Simon J., Gourlay, Campbell W., Batchelor, John C. (2019) Passive Wireless UHF RFID Antenna Label for Sensing Dielectric Properties of Aqueous and Organic Liquids. IEEE Sensors Journal, . ISSN 1530-437X. E-ISSN 1558-1748. (doi:10.1109/JSEN.2019.2896481)

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http://dx.doi.org/10.1109/JSEN.2019.2896481

Abstract

The in situ wireless sensing of dielectric properties for organic aqueous solutions with a wide range of relative permittivities is presented. The use of a UHF passive label antenna design attached to either clear borosilicate glass bottle or petri plate is proposed and which allows for the unobtrusive, safe monitoring of the liquid solutions. The meandered dipole antenna (with a parasitic loop matching component) frequency is highly reliant on the chosen container as well as on the liquid present within, and adjusts with shifting dielectric properties. Tested solutions of high relative permittivity (such as water) along with low permittivity, lossy liquids (such as xylene) presented distinctive frequency characteristics with read distances of up to 7 meters for each type of container tested. The sensor was also able to detect ‘unknown’ solutions and determine the dielectric properties by utilizing standard curve analysis with an accuracy of ± 0.834 relative permittivity and ± 0.050 S·m-1 conductivity (compared to a standard dielectric measurement system available on the market). With the accuracy known, tuning the design to fit any necessary frequency is possible as a means to detect specific changes in any one liquid system. This sensor is a possible candidate for discreet real-time monitoring of liquid storage containers and an alternative for low-cost bulk liquid dielectric property identification which could be implemented in areas requiring, constant, or remote monitoring as needed.

Item Type: Article
DOI/Identification number: 10.1109/JSEN.2019.2896481
Projects: [UNSPECIFIED] Foresight Fellowship in Manufacturing: Defining and Fabricating New Passive Bio-Sensing Wireless Tag Technologies
Uncontrolled keywords: Antenna, battery-free, passive sensing, radio frequency identification (RFID), ultra-high frequency (UHF), wireless sensing
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics (see also: telecommunications) > TK7871.6 Antennas and waveguides > TK7871.67.M53 Microwave antennas
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: John Batchelor
Date Deposited: 08 Feb 2019 13:29 UTC
Last Modified: 09 Jul 2019 11:40 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/72253 (The current URI for this page, for reference purposes)
Holder, Simon J.: https://orcid.org/0000-0001-8977-9257
Gourlay, Campbell W.: https://orcid.org/0000-0002-2373-6788
Batchelor, John C.: https://orcid.org/0000-0002-5139-5765
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