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RFID Antenna Design

Discussion in 'Electronic Design' started by Dogan SOYKAN, Jan 7, 2004.

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  1. Dogan SOYKAN

    Dogan SOYKAN Guest

    I want to design a big (2mx2m) gate antenna that transponders can go
    through it in all vertical and horizontal positions.

    I read all the Texas Instruments documents but was not able to find a
    good way to design what I need.

    Is there anyone who has had an experience with such antenna designing
    or who has an idea how to make it?

    Thanks in advance
     
  2. What is the targetted frequency ?

    Rene
     
  3. I'm guessing that it will be the low frequency stuff, 134kHz from memory for
    TI products. The biggest problem with TI's gate antennas is the
    uni-directional pattern, hence the longer distances. Go mor omni-directional
    and you will loose distance.
     
  4. I assume you mean 13.56MHz. We designed one a few years ago. It is
    basicaly a large loop antenna made of ordinary copper tube. Get
    yourself a good (ham radio) antenna book and a MFJ-259B antenna
    analyzer. We got it working within a few days. BTW, you'll never get
    it through any certification. It has way to much fieldstrength at
    large distance (we measured some 20dB more then allowed accoording to
    the ETSI regulations).

    Three dimensional transponder orientation is always a problem with a
    2-dimensional antenna.

    We can assist you in the design of antennas, but not for free of
    course. You can contact me at r dot gerritsen dot championchip dot nl.

    Reinier
     
  5. Null Set

    Null Set Guest

    Application Note 710 "Antenna Circuit Design" from Microchip,

    http://www.microchip.com/1010/suppdoc/appnote/alpha/index.htm

    looks like it might be useful.

    -MC
     
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