I have designed an antenna for UWB. It is all ok in CST like S11 curve under -10 dB, Gain, Reference impedence and realized gain are also ok. I used time domain solver. But when I run it in frequency domian, then results are lot of changed like bad. On the other hand when it runs in HFSS, also changed. But why? Any one help me or suggestion about this issue.
In my opinion the results that you have obtained (the correct one as per you) does not satisfy the convergence criterion set by the software, therefore you get different results in different domain and in different software. It may be other way round that the conditions are not satisfied when you change the domain/software.
It shouldn't changed too much. If there is large variation in the graphs, maybe your simulation setup will be not the same in both environments. Try to see the final meshing on the structure in both domains.
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