Radio Frequency Identification :: Technology, Electromagnetic Radio Waves

radiocommunication FREQUENCY IDENTIFICATIONIntroductionRFID is a technology which enables detecting and identifying preys utilise electromagnetic radio moving ridges. This is processed through exchange of information mingled with a reader and a tag being attached to the object that includes the data associated with the object. This can be social functiond to detect and classify vehicles, animals, patients, communique goods and airline baggage. 1RFID technology involves two main components, they argon transponders which are too known as tags or labels, contain the relevant information almost the object and other the interrogators, also known as readers or transceivers, that perpetrate the data from the tags. These tags can be passive or quick tags. motionless tags use the energy from the EM radiation of the reader for its processing, where as active tags receive power from an internal battery for its processing and communication with the reader. An co-ordinated electron ic circuit is embedded in tags for storage and processing trading operations and an antenna that transmits and receives the RF signal. 2 Figure components of RFIDSource http//www.docstoc.com/docs/17328767/Draft-SP800-98The tags used in RFID are enabled with read-write operations, with a large storage capacity. Data can be modify any number of times. Tag and reader act as two way radio communication in which each antenna carries the flexion and demodulation of RF signals, with operation frequency cultivates from low frequency to UHF. As radio waves are used, RFID does not require line of sight for communication and the run distance between the reader and tag varies according to the frequency range from few centimetres to few meters. 31 http//en.wikipedia.org/wiki/Radio-frequency_identification2 3 http//www.docstoc.com/docs/17328767/Draft-SP800-98History The start of RFID took place in 1915, by the British with a system called IFF, which means Identification Friend or Foe. In 194 0, during Second World War, the first installation of IFF transponder was in a German aircraft named FUG. 4Leon Theremin, in 1945 invented a device which retransmits an incident radio wave and audio information. This passive device which was trigger off from an external source became the forerunner for RFID technology. 5The concept of RFID came into existence in 1973 when Mario Cardullo invented a passive transponder which emits information when activated by an interrogating signal and consisted a 16bit memory unit for storage purposes. 6In 1973, at the Los Alamos National Laboratory, Steven Depp, Alfred Koelle, and Robert Freyman developed the RFID tag system that uses 12bit tags, operating at 915 MHz. 7After many years of research RFID tags came out with active tags that eliminated the use of external power source.