[moved] RF Circuit Simulation Software (Cheap/Free)

Hi there I am looking for some circuit simulation software, for a project that I am working on.

Some requirement for the circuit is that it needs to be able to simulate transmitting/receiving dipole antennas and also up/down - converter mixers for frequency attenuation/amplification.

Thank you.

maybe i submitted this to the wrong forum

Thread has been moved to a more suitable section.