From: Doug (firstname.lastname@example.org)
Date: Fri Jun 09 2000 - 09:35:55 PDT
> Larry Miller wrote:
> Dr Howie Johnson did an article on this sometime back.
> Here is an excerpt. See what you think:
What would people expect the characteristic impedance
to be of a 4" x 6" x 4mil FR-4 structure?
Parallel plates are just two dimensional transmission
lines with L and C being in units of H/area and F/area.
The equations pop out pretty much the same as a one
dimensional transmission line, i.e.
vprop = 1/sqrt(LC)
Z0 = sqrt(L/C)
In fact, there's some pretty neat derivations
for parallel plates such as
Z0 = sqrt(mu/epsilon)*d/w
d = distance of separation
w = width
ignoring fringing effects.
Just was wondering if anyone has done any
research into correlating pure theory
- Doug McKean
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