Three types of RFID tags: active RFID tags, which contain a battery and can transmit signals autonomously, passive RFID tags, which have no battery and require an external source to provoke signal transmission and battery assisted passive (BAP) which require an external source to wake up but have significant higher forward link capability providing great read range.
One is an integrated circuit for storing and processing information, modulating and demodulating a radio-frequency (RF) signal, and other specialized functions. The second is an antenna for receiving and transmitting the signal.
RFid have been the technology that has be toted at the wave of the future. A series of chips and printable items that will allow us to walk out of stores and be automatically charged. For as many companies that claim RFid is the wave of the future there are also a number of skeptics and those fearful of the power and versatile technologies.
Na sayers
http://news.cnet.com/2010-1069-980325.html
check out thesis website : Marginalia: The Hybrid Textbook
