Author :
Myny, Kris ; Rockele, Maarten ; Chasin, Adrian ; Duy-Vu Pham ; Steiger, Jurgen ; Botnaras, Silviu ; Weber, D. ; Herold, Bernhard ; Ficker, Jurgen ; van Putten, Bas Der ; Gelinck, Gerwin H. ; Genoe, Jan ; Dehaene, Wim ; Heremans, Paul
Abstract :
A bidirectional communication protocol allows radio-frequency identification (RFID) tags to have readout of multiple tags in the RF field without collision of data. In this paper, we realized bidirectional communication between a reader system and thin-film RFID tag by introducing a novel protocol for the uplink communication. Amplitude modulation on the 13.56-MHz base carrier is used to transmit the uplink clock, whereas the data is modulated by varying pulsewidths on this clock. The technology for the thin-film RFID tags combines metal-oxide n-type transistors with organic p-type transistors resulting in a hybrid complementary technology flow. The design of the RFID tag comprises of two metal-oxide transistor rectifiers and a comparator to decode the data transmitted by the reader and different code generators that send 8 bits or 96 bits to the reader.
Keywords :
amplitude modulation; clocks; comparators (circuits); protocols; radio links; radiofrequency identification; rectifiers; thin film transistors; HF hybrid organic-solution-processed metal-oxide RFID tag; RF field; amplitude modulation; bidirectional communication protocol; code generators; comparator; hybrid complementary technology flow; metal-oxide n-type transistors; metal-oxide transistor rectifiers; multiple tags; organic p-type transistors; radio-frequency identification tags; reader system; thin-film RFID tag; uplink clock; uplink communication; Clocks; Delays; Generators; Inverters; Radiofrequency identification; Transistors; Voltage measurement; Bidirectional communication; metal-oxide; organic; radio-frequency identification (RFID); radio-frequency identification tags; thin-film; thin-film transistor (TFT); thin-film transistor (TFT).;
