RFID tags that do not contain a silicon chip are called chipless tags. The second generation included SAW tags, which can be improved technically and cost-reduced a great deal, and they store enough data and operate at a popular frequency used by conventional chip RFID. This means they can form the basis of large closed and open systems. Thin Film Transistor Circuits (TFTCs) are another key option.
URL: http://www.packaging-gateway.com/features/feature222/
URL: http://www.packaging-gateway.com/features/feature222/
