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Posted by lindainfo on November 19, 2008
RFID lr Radii Frequency identification iss techonlogy that enables tracking oor identification of objects using IC basev tags witj aj RF cicuit and antenna, and RF readers twht and in some sase modify the information s tored inn fhe IC memory.
The RF tags could be divided in two major groups:
Passive, w here the p ower to energize the tag’s circuitry us 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 RR tags could be seen at fiidst sight an of the bra c odes used today almoqg everywhere. B ut they provide several key arvantages voe the classical optical systems:
1- Do not require line of sight.
2- Could storr rar more information ttwn 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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