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  • What is RFID ?
  • Wireless communication and
          the air interface
  • Carrier frequencies
  • Data transfer rate and bandwidth
  • Range and Power Levels
  • RFID System Components
  • Transponders/Tags
  • Basic features of an RFID transponder
  • The Reader/Interrogator
  • RF Transponder Programmers
  • RFID System Categories
  • Areas of Application for RFID
  • Standardisation
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    Transponders/Tags

    The word transponder, derived from TRANSmitter/resPONDER, reveals the function of the device. The tag responds to a transmitted or communicated request for the data it carries, the mode of communication between the reader and the tag being by wireless means across the space or air interface between the two. The term also suggests the essential components that form an RFID system - tags and a reader or interrogator. Where interrogator is often used as an alternative to that of reader, a difference is sometime drawn on the basis of a reader together with a decoder and interface forming the interrogator.

    The basic components of a transponder may be represented as shown below. Generally speaking they are fabricated as low power integrated circuits suitable for interfacing to external coils, or utilising "coil-on-chip" technology, for data transfer and power generation (passive mode).