What is RFID and what is difference between active and passive tages?

Subject : Mobile Communication

Topic : Emerging Technologies

Difficulty : Medium

mobile communication • 877  views

Radio frequency identification (RFID)

  • Radio frequency identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data.
  • The data is stored on and retrieved from RFID tags.
  • The tag contains a transponder with a digital memory chip that is given a unique electronic product code.
  • The data is written onto the memory and read from it.
  • An RFID antenna packaged with a transceiver and decoder emits a signal activating the RFID tag so it can read and write data to the tag.
  • When an RFID tag passes through the electromagnetic zone, it detects the reader’s activation signal. The reader decodes the code ID of the tag and the data encoded in the tag’s integrated circuit (silicon chip).
  • In this way, an RFID tag is an information source. The data written onto it can be retrieved whenever needed or it can be transmitted to different RFID readers.
  • RFID is also called dedicated short range communication (DSRC).
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