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Application of metamaterial concepts to chipless-RFID
Author(s): Cristian Herrojo; Miquel Moras; Javier Mata-Contreras; Alba Núñez; Ferran Paredes; Eloi Ramon; Ferran Martín
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Paper Abstract

Chipless radiofrequency identification (chipless-RFID) has emerged as an alternative to RFID systems with tags equipped with chips. The main advantage of chipless-RFID over chipped-RFID is the lower cost of the tags, since the silicon integrated circuits (IC) of chipped tags are replaced with planar passive encoders in chipless tags. The main limitations of chipless-RFID tags are the data storage capability and tag size. In this paper, we propose an approach for the implementation of chipless-RFID systems, based on near-field coupling and sequential bit reading, which alleviates the previous limitations. The tags are implemented by chains of split ring resonators (SRRs) printed on a substrate (including plastic and paper substrates), and the logic state ’1’ or ‘0’ is dictated by the presence or absence of these resonant elements at predefined positions (alternatively, programmable tags can be implemented by detuning certain resonant elements). Tag reading is achieved by means of a transmission line fed by a harmonic signal conveniently tuned, so that such signal is amplitude modulated by tag motion above the line (in proximity to it) due to inductive coupling. Such chipless-RFID system is especially suited for security and authentication applications, by directly printing the planar passive encoders on the items of interest (e.g., corporate and official documents, ballots, exams, etc.). It is demonstrated that the number of achievable bits is only limited by tag size; therefore, the proposed system is compatible with chipped-RFID system in terms of data capacity.

Paper Details

Date Published: 7 May 2018
PDF: 8 pages
Proc. SPIE 10671, Metamaterials XI, 106711X (7 May 2018); doi: 10.1117/12.2299811
Show Author Affiliations
Cristian Herrojo, Univ. Autònoma de Barcelona (Spain)
Miquel Moras, Instituto de Microelectrónica de Barcelona (Spain)
Javier Mata-Contreras, Univ. Autònoma de Barcelona (Spain)
Alba Núñez, Instituto de Microelectrónica de Barcelona (Spain)
Ferran Paredes, Univ. Autònoma de Barcelona (Spain)
Eloi Ramon, Instituto de Microelectrónica de Barcelona (Spain)
Ferran Martín, Univ. Autònoma de Barcelona (Spain)


Published in SPIE Proceedings Vol. 10671:
Metamaterials XI
Allan D. Boardman; Anatoly V. Zayats; Kevin F. MacDonald, Editor(s)

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