Help With Design wave guide bends In HFSS

Guys need help with designing an ideal waveguide bend in HFSS......
Urgent.....

Thank you all in Advance ....

what do you mean by IDEAL?

there is no ideal in this world...

All depends on what is your frequency, and how good RL you are required?

If this is so urgent...why don't you offer due justice in describing your problem. You waste time.