Calculating Radiation Resistance of a Loop Antenna

Apr 14, 2007 2 Replies

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AJ 19 years ago

Hi,

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??

Regards,

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Anthony Fremont 19 years ago

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

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

w=300/434 w=.69124 mtrs

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

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

Looks ok to me. :-)

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AJ 19 years ago

Thanks Anthony... I cringe at my mistake

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