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Calculating Radiation Resistance of a Loop Antenna

Discussion in 'Electronic Design' started by AJ, Apr 14, 2007.

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  1. AJ

    AJ Guest


    I was just wondering if someone could help me out a bit. I have been
    reading Microchips Application Note AN831 and it states that Rrad = 31171
    *(A^2 / w^4), where A = loop area in square meters and w = wavelength. It
    then goes on to say that and square loop with measuring 12 x 34mm at 434MHz
    has a radiation resistance of 0.0227 Ohms. Can some one show me how that
    works out??



  2. w=wavelenth in meters
    A=loop area in square meters

    A= (.012*.034)
    A=.000408 sq mtrs

    w=.69124 mtrs

    A^2 = .000000166464
    w^4 = .22831

    Rrad = 31171 * (.000000166464/.22831)
    Rrad = .0227272101 Ohms

    Looks ok to me. :)
  3. AJ

    AJ Guest

    Thanks Anthony... I cringe at my mistake
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