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Periodic boundary in HFSS

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An_RF_Newbie

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Hi,
I have a rectangular waveguide on which I've defined primary/secondary boundary conditions on the side walls, and I've placed two wave-ports at the beginning and ends of the waveguide. When I simulated the simulation file, it showed me this error:

Port refinement, process hf3d error: Matching boundary LatticePair1_Master1 touches non-Floquet port 1
Click to expand...
9.JPG

However, when I defined a region box around my waveguide it simulated easily.

10.JPG

When all media is PEC why does it say a touch between primary/secondary and a wave port but if I create a distance, this touch is removed?
 

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