About the problem taking care of the reflection to the exciting port, as far as I know you might be able to use port + identity pair + PML. This method enables you to set the port in the middle of the simulation geometry, in contrast to the general case that we usually can't set the port in the boundary inside the simulation unless it is on the exterior boundary of the simulation. This method could be quite complicated if the simulation geometry is complex. I'm adding the address of the site that introducing the method.
srdjancomsol.weebly.com/proper...nd-bcs-with-assemblies-2d.html
I'm also new to Comsol and I'm having the same problem about the reflection to the exciting port. I tried to use the method I described above, but it has not been going well. So, for now I'm just using the scattering boundary to excite the plane wave as you did. Anyway good luck on Comsoling!
srdjancomsol.weebly.com/proper...nd-bcs-with-assemblies-2d.html
I'm also new to Comsol and I'm having the same problem about the reflection to the exciting port. I tried to use the method I described above, but it has not been going well. So, for now I'm just using the scattering boundary to excite the plane wave as you did. Anyway good luck on Comsoling!
