Regarding Svea's concern:
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The problem was that the excitation ports, i.e. truncation boundaries of the FEM model, were located close to geometric discontinuities in the model such that evanescent modes were necessarily present at the ports.
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At this point, it might be feasible to...
***I understand that Ansoft and HP HFSS are the industry standard for EM simulation
This may sound like a statement from a commercial issued by a respective software vendor, but unlikely represents a real engineering practice. This is no similarity to MS Windows here. HFSS is based on FEM, but...
