#11 Attenuation discrepency in tline models.

[Anonymous]

Computation of alpha and thus skin effects seems
drastically different between microstrip and stripline
elements.

Line 381 in TwoPorts.cpp seems to have a bug fix
to an offending formula, yet line 282 uses an equation
of the same nature APLAC tends to agree with the
smaller attenuation.

It looks like the difference is between using 0.5 and
using 27.3/2pi as the leading coefficient against sqrt
(Er), tanrho, length and frequency when computing
alpha.