Sorry, I didn't understand the simulation region, you meant for selecting the whole waveguide or only the portion of the region where the circular bulge is there? The FDE selects only the cross sectional region, not the entire 3D geometry.
Which boundary conditions must be used here ? please suggest metal or PML? How to use the symmetric BCs ?
Yes, the frequency is same.
Have a doubt regarding mesh, currently I am using a selective meshing for the circular bulge of the waveguide, Should I use this selective meshing in whole 3D region or until the FDE region is fine ?
Still no improvements in my results.!
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