Why do you need to do this? If you are simulating a passive, linear system it's just a matter of scaling results.

I do not think that there is a clear feasibility of doing such things

I agree with Marvin, it's just a matter of scaling results as you are simulating a linear passive system.

I do agree with Dr. Marvin and Dr. Hamad, it is just a matter of scaling. either up or down, because it is passive and linear type of system, so modification can be easily done.

Thanks,

In case of RF energy harvesting systems, We need to do it. Muhammad Afiq Abdul Aziz Are you trying to do the same thing?

Elgamal, Abdelrahman. (2020). Re: How can I give user define power at waveguide port in cst?. Retrieved from: https://www.researchgate.net/post/How-can-I-give-user-define-power-at-waveguide-port-in-cst/5e638f2111ec7308b96f7ada/citation/download.

Please view the link above

sometimes we need to check the power handling capacity of the antenna. so, a parametric study might be needed to know the maximum power an antenna can handle.