Upper bounds on the bandwidth of electrically small single-resonant UHF-RFID tags
Zamora González, Gerard (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Zuffanelli, Simone (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Aguilà Moliner, Pau (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Paredes, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Bonache Albacete, Jordi (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Data:	2018
Resum:	In this communication, the upper limits on the bandwidth of single-resonant UHF-radio frequency identification (RFID) tags as a function of the tag size are investigated, with and without forcing perfect matching between the antenna and the application-specific integrated circuit. By means of a circuit network analysis, it is found that bandwidth upper bounds of small tags are significantly higher in comparison with considering conjugate matching. Particularly, it is shown that the half-power bandwidth is √2 times (approximately 41%) higher, requiring a proper relaxation of the matching level at resonance. It is also shown that bandwidth of small real tags with perfect matching, which is typically far from its upper bound, can also be enhanced approximately the same factor at the expense of a small reduction (13. 4%) in the peak read range. A practical example is provided, where two small split-ring resonator-based tags of the same size (k 0 a = 0. 31) are designed. It demonstrates that such improvement on the tag bandwidth can be approximately obtained by simply changing the chip position, without the need of an external matching network. The improved tag was fabricated and measured, as a proof of concept. The results obtained from the proposed analysis allow RFID designers to determine how well a tag performs, compared to theoretical bandwidth limits.
Ajuts:	Ministerio de Economía y Competitividad TEC2016-75650-R Ministerio de Economía y Competitividad TEC2013-40600-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014SGR-157
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Bandwidth ; Upper bound ; Integrated circuit modeling ; Radiofrequency identification ; Antenna radiation patterns ; Shape
Publicat a:	IEEE transactions on antennas and propagation, Vol. 66, issue 4 (April 2018) , art. 2101, ISSN 0018-926X

DOI: 10.1109/TAP.2018.2800802

Postprint 7 p, 928.3 KB

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