Enhancing the Per-Unit-Length Data Density in Near-Field Chipless-RFID Systems With Sequential Bit Reading
Havlíček, Jaroslav (Czech Technical University in Prague. Department of Electromagnetic Field)
Herrojo, Cristian (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Paredes, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Mata Contreras, Francisco Javier (Universidad de Málaga. Departamento de Ingeniería de Comunicaciones)
Martín, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2019
Abstract:	In this letter, a novel near-field chipless-Radio Frequency Identification (RFID) system with sequential bit reading is reported. The main novelty concerns the tags, implemented by means of straight half-wavelength resonators separated by a small distance and forming a linear chain in the direction orthogonal to their axis. By this means, the number of resonant elements (or bits) per unit length of the tag is significantly increased, as compared to the previous implementations, with the result of very competitive tags in terms of data density. The active part of the reader is a microstrip line loaded with a shunt stub. Through a proper design, it is possible to achieve a significant excursion of the transmission coefficient when the stub is either loaded or unloaded with a functional resonant element of the tag. Consequently, by tag motion over the reader (stub), it is possible to infer the Identification (ID) code by simply injecting a harmonic signal to the input port of the stub-loaded line (the ID code is contained in the amplitude modulated, signal at the output port). This system has been validated by considering 100 b tags exhibiting a surface data density of 4. 9 b/cm 2 . However, the relevant parameter is the data density per unit length, as high as 16. 7 b/cm, i. e. , much larger than previous values reported in the literature in similar chipless-RFID systems.
Grants:	Ministerio de Ciencia e Innovación TEC2016-75650-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1159 Ministerio de Economía y Competitividad BES-2014-068164
Note:	Altres ajuts: Institució Catalana de Recerca i Estudis Avançats, and FEDER funds
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Chipless-RFID ; Microstrip ; Half-wavelength resonator ; Secure paper ; Resonators ; Resonant frequency ; Time-domain analysis ; Air gaps ; Substrates ; Couplings
Published in:	IEEE antennas and wireless propagation letters, Vol. 18, Issue 1 (January 2019) , p. 89-92, ISSN 1536-1225

DOI: 10.1109/LAWP.2018.2881356

Postprint 5 p, 676.5 KB

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