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Applicability of Metallic Nanoparticle Inks in RFID Applications

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4 Author(s)
Allen, M.L. ; Sensors Center, VTT Tech. Res. Center of Finland, Espoo, Finland ; Jaakkola, K. ; Nummila, K. ; Seppa, H.

Radio frequency identification (RFID) antennas for HF and UHF frequencies are ink-jet printed using commercially available silver nanoparticle ink. Quality factors of 5.3 and 9.4 are obtained for coil antennas targeted for 13.56 MHz when the printing and sintering process is repeated two and three times, respectively. The measured maximum effective aperture of the printed UHF antenna is only some decibels lower than that of an equivalent etched copper antenna and the maximum reading distance with 0.5 W (ERP) transmitted power is 3 m for continuous reading. These results suggest that obtaining a low enough series resistance for printed coils is challenging while printed RFID antennas for UHF do not set as strict requirements on conductivity. With a perfectly optimized structure, a UHF tag antenna printed in just one layer of ink can be practically equal in performance with the traditional etched copper and aluminum tags.

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Components and Packaging Technologies, IEEE Transactions on  (Volume:32 ,  Issue: 2 )