International Workshop on Antenna Technology - iWAT 2012, Tucson (United States of America). 05-07 March 2012
Summary:
The purpose of this paper is to demonstrate the possibility of implementing folded dipole antennas operative at two closely spaced frequencies of interest, for instance, in ultra-high-frequency radio frequency identification (UHF-RFID) applications. The dual-band functionality is achieved by coupling a spiral resonator to the antenna, which operates as an unbalanced transmission line. This modifies the impedance of the antenna and dual-band functionality can be achieved by virtue of the conjugate matching between the antenna and the chip at the frequencies of interest. Two prototype devices have been designed and fabricated: a mono-band folded dipole UHF-RFID tag, and a dual-band UHF-RFID tag based on a spiral resonator coupled to a folded dipole antenna. The measured read ranges at the operating frequencies are in the vicinity of 6 m. The read ranges of the designed tags have been also measured by attaching them to different objects (a CD-ROM box and a plastic ID card). A certain frequency shift is obtained, but this shift can be corrected by merely modifying the distance between the resonator and the antenna.
Keywords: Dipole antenna, sRadio frequency identification (RFID), Radio navigation, Resonators
DOI: 
https://doi.org/10.1109/IWAT.2012.6178417
Publication date: 2012-03-05.
Citation:
F. Paredes, G. Zamora, F.J. Herraiz-Martínez, F. Martín, J. Bonache, Dual-band RFID tags based on folded dipole antennas loaded with spiral resonators, International Workshop on Antenna Technology - iWAT 2012, Tucson (United States of America). 05-07 March 2012.
