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Classes of RFID tags

There are three classes of RFID tags, depending on their ability to interact with the complete system:


The tag has no battery and responds as a passive element reflecting the read signal. The label consists of an aluminium antenna and an IC. 


The tag has a battery connected to the IC. It acts as a passive element, but, at the moment of signal reflection, it injects energy to reach further (30 metres) or to transport more complex information (e.g. Temperature).


The tag has a connected battery and acts as an active element by constantly emitting a signal that can be read by the reading system up to 100 metres away.