How does RFID (Radio Frequency Identification) work?

How does RFID (Radio Frequency Identification) work?

I need to know how RFID actually works. I googled it but nowhere seems to be able to give me a description along with a circuit diagram. Its a topic in an exam I am taking next week and is worth a good few marks if I can fully explain it.

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1 Comment for How does RFID (Radio Frequency Identification) work?

  • 1. Numbat  |  February 15th, 2011 at 9:04 am

    Radio-frequency identification (RFID) is the use of an object (typically referred to as an RFID tag) applied to or incorporated into a product, animal, or person for the purpose of identification and tracking using radio waves.

    They can be divided up into three classes. Active RFID tags, which contain a battery and can transmit signals autonomously, passive RFID tags, which have no battery and require an external source to provoke signal transmission, and battery assisted passive (BAP) RFID tags, which require an external source to wake up but have significant higher forward link capability providing greater range.

    Most RFID tags contain at least two parts. One is an integrated circuit for storing and processing information, modulating and demodulating a radio-frequency (RF) signal, and other specialized functions. The second is an antenna for receiving and transmitting the signal. They can be made very small but are limited in size by the antenna.

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