Is there any inherent limitation in FDTD (as implemented by Remcom X-Fdtd or CST) that might preclude it from solving for certain electromagnetic wave modes? Specifically, I'm trying to simulate an experimental structure where we are measuring a surface wave in a lossy dielectric, but the X-fdtd model does not show the measured behavior.
Ivan Kurkan
FDTD solvers use Maxwell's equations inside volume, there is no information about modes at this stage. Modes are attributed to "regular transmission lines". EM fields are calculated at ports to match modes. It might be done in different ways with some certain restrictions (depends on code). I think, You have faced some limitations of the code. The most propable reason is wrong port definition.
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