Dual-band impedance-matching networks based on split-ring resonators for applications in RF identification (RFID)
Paredes, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Zamora González, Gerard (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Bonache Albacete, Jordi (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Martín, Ferran (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2010
Abstract:	This paper is focused on the design of dual-band impedance-matching networks of interest in RF identification (RFID) systems. By cascading an impedance-matching network between the chip and antenna, the performance of the RFID tags can be improved. The main aim of this study is to demonstrate the possibility of designing such networks by means of split-ring resonators coupled to microstrip transmission lines. These resonators are especially useful in this design since their equivalent circuit substantially simplifies the parameter calculation of the matching network. Dual-band conjugate matching at two different frequencies, f1=867 MHz and f2=915 MHz, corresponding to the assigned bands for UHF RFID in Europe and the U. S. , respectively, is demonstrated. The main difficulty for the synthesis of these dual-band matching networks relies on the proximity of f1 and f2 . Although the chip impedance cannot be considered a design parameter, the network design can be alleviated by allowing certain flexibility in the antenna stage. The fabricated prototype, a dual-band impedance-matching network based on split-ring resonators and loaded with a slot antenna, was characterized by measuring its reflection coefficient. The results reveal that conjugate matching at the above-cited frequencies for the chip impedance under consideration is achieved.
Grants:	Ministerio de Educación y Ciencia TEC2007-68013-C02-02 Ministerio de Industria, Turismo y Comercio FIT-330225-2007-15 Ministerio de Industria, Turismo y Comercio TSI-020400-2008-119 Ministerio de Ciencia e Innovación CSD2008-00066 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-421
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Dual-band ; Split Ring Resonators ; Radiofrequency Identification (RFID) ; Impedance Matching Networks
Published in:	IEEE transactions on microwave theory and techniques, Vol. 58, issue 5 (May 2010) , p. 1159-1166, ISSN 0018-9480

DOI: 10.1109/TMTT.2010.2045449

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