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RFID antenna design.

Discussion in 'Electronic Design' started by Boki, Jun 27, 2007.

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  1. Boki

    Boki Guest

    Hi All,

    I am modifing a RFID antenna.

    The sample board work well, however, we did a same board by ourself
    but the result is bad.

    The sample board work range is about 10cm.

    My board is about 1 cm.

    The big different is our circuit do not use the large capacitor as
    sample board.

    I am thinking that the capacitor is for huge current using when RFID
    send out power to read tag.

    So, the problem should be the capacitor. ( I am trynig to change it to
    test )

    However, beside this capacitor, I heard there is no Banul filter
    there, and no consider to the 3/4 lamda issue.

    Could you please advice what are them ? and how should I get it work
    better ?

    P.S I have only baseband (ADC) EE knowledge background.

    Appreciate!

    Best regards,
    Boki.
     
  2. Wimpie

    Wimpie Guest

    Hi Boki,

    To enable readers to give useful feedback, I think you should provide
    some additional information (frequency, antenna type, chip, maybe your
    circuit/layout and evaluation board circuit/layout, etc).

    Best regards,

    Wim
    PA3DJS
    www.tetech.nl
     
  3. Boki

    Boki Guest

    Hi Boki,
    Hi Win,

    2.45GHz.
    It is a print board antenna.
    It seems we don't need to use Balun filter for RFID, right ?

    Best regards,
    Boki.
     
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