Efficiency & Gain from ANSYS DESIGNER

Hello,

I'm working on antennas and I use HFSS for the simulation. Now, I start to use DESIGNER for the co_simulation. I import the model HFSS to DESIGNER, I connect components (capa, inductance..) and I would like to calculate EFFiciency and the gain of the new system. Can you help me please?
thx :)

why don't you use lumped RLC elements within your HFSS simulation ?

Yes, I could use LUMPED RLC this time but in the future I will use complicated circuit that
I will be obliged to use DESIGNER.