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Frequency-Coded Chipless RFID Tag Based on Dual-Band Resonators

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5 Author(s)
Girbau, D. ; Electron., Electr. & Autom. Control Eng. Dept., Univ. Rovira i Virgili, Tarragona, Spain ; Lorenzo, J. ; Lazaro, A. ; Ferrater, C.
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The integration of dual-band resonators in frequency-coded chipless RFID tags is proposed in this letter. It is demonstrated that 3N words can be coded in a tag when using N stub-loaded dual-band resonators. It is also shown that an operation bandwidth improvement is achieved in comparison to the use of conventional half-wavelength resonators. A theoretical analysis of the resonator is provided, and a four-resonator tag is designed, manufactured, and measured as a proof of concept. Two processing techniques are used to improve detection and increase the read range: calibration and time gating.

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Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )