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Martin,

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Regardless the type of loop antenna untuned or tuned the radiation resistance gets calculated ?the same way because the radiation resistance is:

??? R rad.= 31200 x (NxA / wavelength of interest^2) ^2 where N – number of loops, A=pi x ( D/2)^2 ,where D is diameter of loop.

Only the deference between an untuned and tuned loop antennas will be their impedances due to Q-factor of antenna at resonant frequency.

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Regards,

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Raphael

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On Sun, Oct 30, 2022 at 10:51 PM, Raphael Wasserman wrote:

Probably now you may understand the meaning of receiving antenna efficiency factor.

Unfortunately, I'm now even more confused...

But it think this is simply due to the definitions and how they are being used.

A quick question.

If we have a 'broadband' un-tuned loop, and then tune it to resonance, does this change the Radiation Resistance ?

Regards,

Martin