RF simulation

Please I need a simulator for RF/microwave circuits
I am designing a mixer and I need to simulate my work so far because I'm doing it in stages. Please help!

Terminate ur circuit at 50ohms of input and output impedence and run the simulation at any normal analog tool, by this may be u'll not get the exact behaviour of the circuit but u'll get an idea tht ur design is workin correctly or not.

Search this site for "Best RF simulators" .
There are many, and it will depend on your skill level on which one fits
your need.

And Mixer simulation is not simple. You can also google
"Mixer design tutorials" and not only will you find mixer design info but they
typically explain which tool they used and what were the tricky parts of the
simulations.

Cheers

thanks for the advice.just about trying google out