CST waveguide port warning

Max01800

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Hey guys, I'm trying to simulate a CPW sandwiched between two dielectric substrate, as shown in the photo. There are two Waveguide Port and I put open boundaries on all the faces of the boundary box. During the simulation I get this warning

"Waveguide port x touches transversal open boundary"

1) What does it mean?
2) Should I be worried?
3) How do i solve this? Which boundary should I use?
 

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Hello, You can do "open boandary add space" so the port wont touch the boundary.
Thanks.
 

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