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RFID vs RF IC through/underwater

Discussion in 'Electronic Design' started by ChronoFish, Nov 3, 2003.

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  1. ChronoFish

    ChronoFish Guest

    Hi there,

    From my understanding RF-Tag technology is still sketchy so maybe it's
    not the best solution for my need.

    What I need is a small transmitter operating at a range up to 1 meter
    (greater than 2 meters is actually not desirable). I am looking for
    frequencies no higher than 27 MHz as the medium the application is
    operating in is water or a water/air combination.

    Most of the RFICs that I have found begin their operation at 100MHz
    and tend to be in the 300MHz - 450MHz range. I belive this will be
    too high for my needs.

    TI prodcues RFID chips in the 134kHz and 13MHz range and this seems
    very desirable (has a range of 1 meter and has a package size of only
    1mm x 32mm). What is holding me back here is the cost of the readers.
    I believe part of what makes the cost so high is that the reader needs
    to generate a large magnetic field to power multiple tranmitters in a
    relatively large area (1 meter radius?). My thought here was to
    combine the RFID chip with it's own powersource. Now the power source
    only needs to work in the 1 - 30 mm range, and only for a single
    transmitter.

    Any idea of what this power source would look like? I realize it may
    double or triple the size of the RFID package - and that's okay - much
    larger than that may not be. The power doesn't need to be continuous,
    but I would like to be able to broadcast 2-3 times a second or so
    using a quarter size batery.

    Looking forward to your suggestions and feedback.

    Thanks!
    Christopher
     
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