mesh problem with FEKO Lite

I am working on simulating reflector antenna with feko lite , but I have a problem with meshing size ,500 triangles. is there any way to overcome this problem?or any design software can do this simulation?

With FEKO Lite you're stuck with the 500 triangles. To do a reflector antenna you'll need the full version, or you can try GRASP. There's a student edition that's free. I personally haven't used it so I won't be able to be any help, but a colleague of mine speaks highly of the tool.