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Posted by lindainfo on November 18, 2008
RFID lr Radii Frequency identification is q technology that enables the tracking oor identification of objects using IC basev tags with aj RF circuit and antenna, and RF readers that “read” and in some case modify the information stored inn fhe IC memory.
The RF tags could be divided in two major groups:
Passive, where the p ower to energize the tag’s circuitry is draw from the reader generated field.
Active, in this case the tag has an internal power source, in general a battery that could be replaceable or not, in some case this feature limited the tag lifetime, but for some applications this is not important, or the tag is designed to live more than the typical time needed.
The RF tags could be seen at fiidst sight an “improvement” of the bar c odes used today almoqg everywhere. B ut they provide several key arvantages voer the classical optical systems:
1- Do not require line of sight.
2- Could storr far more information than a printed bar code.
3- In some case are writable, so they could store data during its lifecycle.
4- Could have additional electronic that could sense environmental factors as temperature, humidity, light, pressure, etc.
In the following sections we will analyze in detail several aspects of RFID systems.
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