[SI-LIST] : Basic Transmission Line question

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From: tcoyle (TCoyle@pdcme.fairchildsemi.com)
Date: Thu May 24 2001 - 11:19:00 PDT


Hello,
I have a basic transmission line question. I am reading through Howard
Johnson's book and he's talking about lumped and distributed
transmission lines.
It basically states that if the length of the system is small enough,
then the lumped model can be used. If it is not, then a distributed
model can be used.
It is also stated that the lumped model has fixed component values good
over a low frequency range. The distributed model is good for high freq
range because it takes into account skin effect and so forth. My
confusion comes from comparing this to a lossless and lossy lines. Is
the lumped model a lossless line, because it is only accuarate at low
frequencies? Or can it be both lossless and lossy?

Thanks for any insight provided

Tim

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