NDLI: A low cost flexible passive UHF RFID tag for sensing moisture based on antenna polarization

Content Provider	IEEE Xplore Digital Library
Author	Sajal, S. Atanasov, Y. Braaten, B.D. Marinov, V. Swenson, O.
Copyright Year	2014
Description	Author affiliation: North Dakota State Univ. Fargo, Fargo, ND, USA (Sajal, S.; Atanasov, Y.; Braaten, B.D.; Marinov, V.; Swenson, O.)
Abstract	Cost optimization and performance are the continuous improvement areas in any technology. In this paper a flexible dipole antenna on a passive UHF RFID tag is designed on an inexpensive paper substrate which can sense the moisture based on the polarization of the antenna. An inexpensive paper substrate and copper (Cu) layer are used for the flexibility and the optimization of manufacturing cost. The dipole antenna is matched with the complex conjugate of the power harvesting circuit of the Higgs2 Integrated Circuit (13.88 -j143.6 at the frequency of 915 MHz). The key characteristic of this design is the sensitivity of the antenna polarization on the passive RFID tag to the moisture content in the paper substrate. In simulations, the antenna is circularly polarized when the substrate is dry (relative permittivity, $ϵ_{r}=$ 2.38) and the antenna is linearly polarized when the substrate is wet (relative permittivity, ϵ $_{r}=$ 35.35). The read ranges of the fabricated dipole antenna (i.e., prototype RFID moisture sensor) are measured and the desired performance is achieved with overall tag dimensions of $0.144λ_{o}$ × $0.133λ_{o}$ where $λ_{o}$ is the free space wavelength at 915 MHz.
Starting Page	542
Ending Page	545
File Size	1346942
Page Count	4
File Format	PDF
ISBN	9781479947744
ISSN	21540373
DOI	10.1109/EIT.2014.6871822
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dipole antennas Moisture Substrates Patents Permittivity Antenna measurements
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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