RFSim99 is a freeware software that can help you in RF simulation, in your projects, especially if you are trying to design radio filters.
RFSim99 works with S-parameters. This means that not only will it simulate and analyse circuits built out of its internal library of components, but that it can accommodate any circuit block or stage for which these are known.


You can download it for free because it’s free >>> RFSim99 download<<<
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RFSim99 software screenshot

rfsim99