I simulate a periodic structure placed on a lossy, dispersive half-space whose relative permittivity is smaller than zero at some frequencies. Using CST 2020, I apply open boundary condition (without adding space) in the direction filled with the mentioned medium.
However, the simulation doesn't progress due to the errors. These errors are as follows:
1) "The Floquet port boundary at Zmin must be homogeneously filled with isotropic loss-free and non-dispersive material. For non-dispersive materials, please consider using the option to "Ignore losses" in the solver specials.".
2)"The Floquet port boundary at Zmin has negative material coefficients, which are not supported."
Curious to know the reason. Does it belong to the software limitations or sth?
Any suggestions or ideas are appreciated.
Thanks
Dear Dr. Smrity Dwivedi
Thanks for sending the document.
I've seen it before and there isn't any mention of the issue.
Thanks for your response dear Libi Mol V.A
Yes, I've used this technique to get the results. But, as I mentioned i want to know why Floquet ports can't model lossy (as well as dispersive) half-space medium without using the Open add space boundary conditions (BCs).
Because, by considering a quarter wavelength space between the medium and Floquet port (via using Open add space BCs ), we don't model a half-space anymore. Accordingly, we can obtain results approximately by considering sufficient thickness for the lossy (or dispersive) medium.
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