Rfid
RFID TECHNOLOGY
Radio Frequency Identification (also known as Dedicated Short Range Communication - DSRC) is a technology that incorporates the use of electromagnetic or electrostatic coupling in the radio frequency (RF) portion of the electromagnetic spectrum to uniquely identify an object, animal, or person. It is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders.
HISTORY
In 1946 Léon Theremin invented an espionage tool for the Soviet that retransmitted incident radio waves with audio information. Even though this device was a passive covert listening device, not an identification tag, it has been attributed as the first known device and a predecessor to RFID technology. The technology used in RFID has been around since the early 1920s. Mario Cardullo's U.S. Patent 3,713,148 in 1973 was the first true ancestor of modern RFID, a passive radio transponder with memory. The initial reflective power passive device was then demonstrated in 1971 to the New York Port Authority and other potential users and consisted of a transponder with 16 bit memory for use as a toll device. Since then RFID has evolved by leaps and bounds.
RFID SYSTEM
An RFID system consists of three components:
An antenna
A transceiver (often combined into one reader) and
A transponder (the tag)
The antenna and transceiver read the radio frequency and transfer the information to a processing device. An RFID tag is an integrated circuit containing the RF circuitry and information to be transmitted and can be attached to or incorporated into a product, animal, or person for the purpose of identification using radio waves. The antenna uses radio frequency waves to transmit a signal that activates the transponder. When activated, the tag transmits data back to the antenna. The data is used to notify a programmable logic controller that an action...
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