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CST Microwave Problem - Questioning Error

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barbie24

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Hi,

I have a problem. I am simulating a structure w/ a waveguide port. S11 parameter is linearly higher than 1 when I use open (add) space Boundary condition. Physically not meaningful due to energy conservation.

But, when I use open Boundary Conditions, this time I obtain an error as:

" Inhomogeneous material at open boundary detected. (The structure must be identical in the open boundary plane and the next two mesh steps. ) "

Can anyone help me w/ this problem.

Thanx in advance.
 

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