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Mid-range RFID project

Discussion in 'Electronic Equipment' started by Lei Liu, Jan 21, 2004.

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  1. Lei Liu

    Lei Liu Guest

    I am preparing for a mobile, mid-range RFID project. It involves
    reading up to a dozen or so tags with a portable or hand held device
    in a range upto 2-3 meters. The data transmission doesn't have to be
    fast, but there may be more than one readable tag within reading zone.
    It would be nice if reading is not sensitive to the orientation of
    tags. Tags may not always be in the line of sight. Finally, the system
    should as inexpensive as possible. We can do limited hardware and
    software work to integrate reader output (RS232 or USB or PCMCIA card)
    to a hand held pc. What technology (high/low frequency,
    active/passive) will work for such a system? What company/product do
    you recommand? What is the estimated cost?
    Thank you very much!
    L.L.
     
  2. Jim Thompson

    Jim Thompson Guest

    Rather than re-invent the wheel, why don't you contact SAVI Technology
    in Sunnyvale, California?

    ...Jim Thompson
     
  3. CWatters

    CWatters Guest

    Yeah go contact companies that make RFID tags for car keys etc. I think
    Philips and Dallas and ??
     
  4. As far as I know there isn't any passive tag technology going up to 2-3m,
    except with 10 sq-meter sized antennas... State of the art is 1m with 1 sq-m
    antenna, and 10-20cm with reasonnably sized antennas. So the only solution
    is active tags.

    Yours,
    Robert Lacoste - ALCIOM : The mixed signals experts
    http://www.alciom.com
     
  5. Jim Thompson

    Jim Thompson Guest

    That's why I suggested SAVI. They make active tags, but are
    micro-power (asleep most of the time).

    (I designed the chip for their latest tags ;-)

    ...Jim Thompson
     
  6. Wayne Shanks

    Wayne Shanks Guest


    Matrics 915 MHz passive tags can do this, and we have a hand held...
    The Tags have a crossed dual dipole, so there is no deep antenna null
    (orientation insensitive)

    the tags are of the order of 50 cents in low quantities, the hand held
    reader is a few killobucks.

    Wayne Shanks
     
  7. Texas Instruments have some good long range stuff, including antenna's.
     
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