RF

Discussion in 'The Projects Forum' started by Cerkit, Dec 7, 2009.

  1. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009
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    Anyone know an rfid system which has a range of >200m?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    The transponders used in RFID are passive. They harvest energy from the interrogation pulse in order to send a signal back. So the inverse square law makes ranges of anything like 200m very unlikely.
     
  3. bertus

    Administrator

    Apr 5, 2008
    18,684
    3,635
    Hello,

    I think a range upto 1 m should be possible.
    The frequency is also of influence of the range.
    Here is an article on RFID and range:
    http://www.rfid.com.sg/range.htm

    An active system like GPS localisation will have an "unlimited" range.

    Greetings,
    Bertus
     
  4. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009
    286
    3
    What about active tags? Or is that not considered rfid anymore? What system could I use for awareness recognition that spans up to 200m?

    Thanks
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. jpanhalt

    Expert

    Jan 18, 2008
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    Don't the transponders used in aircraft meet that definition?

    John
     
  7. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009
    286
    3
    Ok. What could I use that has approx a 1 metre radius of detection?
     
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