s-parameter simulation

can anyone please guide me how to do a s-parameter simulation for a switch or a filter- i shud start with downloading the s files from the manufacturer's website then what should i do?

What components are you trying to convert? Datasheets/Prt. Numbers?

If it is simple components you can convert the S-parameters to Z or Y and build the equivalent circuit for simulation.

There is many S to Y/Z converter equation references with the equivalent circuits available over the net.