Hey Hadi-Alik,
Thanks for your response! You guys seem to know a lot more than me about this stuff, I just pretend to be an electrical engineer!
I think I will stick with the wave port since I don't know the impedance of my line at all. So to check the excited modes you mean to look at the field pattern on the wave port (Vector E-field) after I solve the simulation (since I am using it to absorb the wave, not excite any sort of modes)? I think that makes sense, I will try that. Much appreciated