As others have mentioned, the subject is quite complex. So let me throw in
yet another complexity.
I know the following holds for uncorrelated line sources (e.g., a line of
fluorescent lamps), but I am not sure about correlated sources such as
signal leakage from a power line. But here goes anyway.
If the power line is taken as a uniform line source, is straight, and is
long compared to the distance from the observation point to the line, then
the e-field would fall off as 1/sqrt(r) (once beyond the near field
region).
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
"PLC Webmaster" <[email protected]> wrote on 12/14/2003
05:03:32 PM:
> I am currently researching the radiated emissions from High
> Frequency Power Line Communications (1-30MHz).
>
> I am trying to obtain information on how the e-field typically falls
> of with distance. I have read books that have made claims that this
> is anywhere in the rang 1/d to 1/5d. I am trying to make a
> statistical analysis to explain to those who claim that in the near
> field it is (1/d^2) which they derive from an infitesimally small dipole.
>
> Does anyone know of any papers, experiments or actual EMC compliance
> measurements in the range 1-30MHz that I could use to make an
> analysis of the drop off rate.
>
> Thanks,
> Iain
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