Re: NEC-LIST: image modeling over lossy earth

This topic is covered very well in Kraus' _Antennas_.

Roy Lewallen

GrantBingeman_at_cs.com wrote:
> I am looking for an article that discusses modeling a dipole over lossy
> ground in terms of Z1, Z12 and Z11, such that the image current is less than the
> source current above ground. In free space with no losses, two dipoles driven
> with equal currents allow us to find Z12 easily as Z1 - Z11. We also assume
> that Z12 = Z21.
>
> If we model a single dipole over perfect ground, we can assume that the image
> reflection is perfect, although 180 degrees out of phase with the
> above-ground source.
>
> However, if our two dipoles consist of a dipole 20 feet above 5 mS/m earth,
> and an image 20 feet below ground, does Z12 = Z21? If so, then I1 cannot equal
> I2. NEC can tell us what Z1, I1 and Z11 are, but how do we solve for Z12 and
> I2?
>
> Grant W. Bingeman, P.E.
>

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