Depending on what you want to do, you might try RFSIMM99 which is a fairly
powerful S parameter simulator program.

It is free and if you do a search for that name you ought to get a lot of
sites to download it from.

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When I set the passive components to use real world models, I can enter
the self resonant frequencies and so on from the catalog for the particular
component I want to use.

Then, running Random Simulation mode, I can find if my design has critical
components. I like that !!!

The ability to include real world parasitics is a nice part of the
program, and I use it to keep my designs as tolerant of the actual
components as possible.


Jim Pennell
N6BIU