Introduction - If you have any usage issues, please Google them yourself
The automated identification of objects
with electromagnetic fields is the major
purpose of the RFID [Radio Frequency
Identification] technology. An RFID system
basically consists of transponders [tags],
readers [scanners] and application systems
for further processing of the acquired data.
There is a large variety of different RFID
systems: they may use low, high or ultra
high frequencies, the transponder may emit
only a fixed identifier or possess
significant memory and processing
capabilities. Transponders may incorporate
no security features at all or realise
effective security protocols similar to
smartcards. Most transponders are
passively powered by the radio field
emitted by the reader but there are also
active tags with a separate power supply.
The transponder design is also little
uniform: there are e.g. tiny tags with a size
of several millimetres, very thin “smart
labels” or standard ID-1 cards