RFID

A short and high-level intro into RFID

Transcript

1. Radio-frequency identification
2. Radio-frequency identification (RFID) is the wireless non-contact use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects.
3. Some tags require no battery and are powered and read at short ranges via magnetic fields (electromagnetic induction). Others use a local power source and emit radio waves (electromagnetic radiation at radio frequencies).
4. The tag contains electronically stored information which may be read from up to several meters away. Unlike a bar code, the tag does not need to be within line of sight of the reader and may be embedded in the tracked object.
5. RFID tags are used in many industries. An RFID tag attached to an automobile during production can be used to track its progress through the assembly line.
6. Pharmaceuticals can be tracked through warehouses.
7. Livestock and pets may have tags injected, allowing positive identification of the animal.
8. Since RFID tags can be attached to clothing, possessions, or even implanted within people, the possibility of reading personally-linked information without consent has raised privacy concerns.
9. An RFID system uses tags, or labels attached to the objects to be identified. Two-way radio transmitter-receivers called interrogators or readers send a signal to the tag and read its response. The readers generally transmit their observations to a computer system running RFID software or RFID middleware.
10. Configurations • Passive Reader Active Tag (PRAT) • Active Reader Passive Tag (ARPT) • Active Reader Active Tag(ARAT)
11. Passive Reader Active Tag (PRAT) • system that has a passive reader which only receives radio signals from active tags (battery operated, transmit only). The reception range of a PRAT system reader can be adjusted from 1-2,000 feet. Thereby allowing for great flexibility in applications such as asset protection and supervision
12. Active Reader Passive Tag (ARPT) • system that has an active reader, which transmits interrogator signals and also receives authentication replies from passive tags
13. Active Reader Active Tag (ARAT) • system in which active tags are awoken with an interrogator signal from the active reader. A variation of this system could also use a Battery Assisted Passive (BAP) tag which acts like a passive tag but has a small battery to power the tag's return reporting signal.
14. References • http://www.mayang.com/textures/Manmade/images/Paper/circular_design_paper_9001.jpg • http://www.howstuffworks.com/gadgets/high-tech-gadgets/rfid.htm • http://en.wikipedia.org/wiki/Radio-frequency_identification • http://api.ning.com/files/QFSjLPszBbnu4qF4LUg1MkX3gTJZ56r8InPoj4NDdHlRRrnKvwJJh8r- ZsadTQIjeZA*JkeTesnkJwbAobFyj*Psutf-cl-k/RFIDcapsule.jpg • http://itgsonline.com/wp-content/uploads/2007/10/2006-03-30_-_hands1.jpg • http://en.wikipedia.org/wiki/Microchip_implant_(human) • http://images.pressplaytv.com.s3.amazonaws.com/2012/06/5be1ad9430c22e9f28210accb49a2951.jpg