Radio-frequency,identification business, insurance Radio-frequency identification
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Radio-frequencyidentification (RFID) is an automatic identification method, relyingon storing and remotely retrieving data using devices called RFIDtags or transponders.AnRFID tag is an object that can be applied to or incorporated into aproduct, animal, or person for the purpose of identification usingradio waves. Some tags can be read from several meters away andbeyond the line of sight of the reader.MostRFID tags contain at least two parts. One is an integrated circuitfor storing and processing information, modulating and demodulating a(RF) signal, and other specialized functions. The second is anantenna for receiving and transmitting the signal. Chipless RFIDallows for discrete identification of tags without an integratedcircuit, thereby allowing tags to be printed directly onto assets ata lower cost than traditional tags.Today,RFID is used in enterprise supply chain management to improve theefficiency of inventory tracking and management. However, growth andadoption in the enterprise supply chain market is limited becausecurrent commercial technology does not link the indoor tracking tothe overall end-to-end supply chain visibility. Coupled with faircost-sharing mechanisms, rational motives and justified returns fromRFID technology investments are the key ingredients to achievelong-term and sustainable RFID technology adoption.RFIDtagsRFIDtags come in three general varieties:- passive, active, orsemi-passive (also known as battery-assisted). Passive tags requireno internal power source, thus being pure passive devices (they areonly active when a reader is nearby to power them), whereassemi-passive and active tags require a power source, usually a smallbattery.PassivePassiveRFID tags have no internal power supply. The minute electricalcurrent induced in the antenna by the incoming radio frequency signalprovides just enough power for the CMOS integrated circuit in the tagto power up and transmit a response. Most passive tags signal bybackscattering the carrier wave from the reader. This means that theantenna has to be designed both to collect power from the incomingsignal and also to transmit the outbound backscatter signal. Theresponse of a passive RFID tag is not necessarily just an ID number;the tag chip can contain non-volatile data, possibly writable EEPROMfor storing data.ActiveUnlikepassive RFID tags, active RFID tags have their own internal powersource, which is used to power the integrated circuits and tobroadcast the response signal to the reader. Communications fromactive tags to readers is typically much more reliable (i.e. fewererrors) than from passive tags due to the ability for active tags toconduct a "session" with a reader.Semi-passiveSemi-passivetags are similar to active tags in that they have their own powersource, but the battery only powers the microchip and does not powerthe broadcasting of a signal. The response is usually powered bymeans of backscattering the RF energy from the reader, where energyis reflected back to the reader as with passive tags. An additionalapplication for the battery is to power data storage.Beganto ElectronicComponents Article Tags: Radio-frequency Identification, Rfid Tags, Integrated Circuit, Supply Chain, Passive Tags, Internal Power, Power Source, Active Tags, Passive Rfid
Radio-frequency,identification