Re: NEC-LIST: Imperfect ground.

"D. B. Miron" wrote:
>
> I have seen Renier's figures in the ARRL Antenna Handbook, I believe.
>
> Doug Miron
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Generally, antenna designers assume Sigma and Epsilon values that are
fairly constant across some range of freq's. Thats what NEC does.
Otherwise the computations for the Sommerfeld approximation dominate the
sim run. Of course, nowadays computers are so damn fast I wonder if it
really makes any difference?

If you really want to get your head spinning, realize that Epsilon and
Mu can be a dyads, i.e. a tensor of rank 2.
Or in other words, a complex matrix with 9 elements. Such math is used
when the medium is anisotropic, gyroscopic, etc.

Rob.

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