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simulation of tapered coupler in HFSS or CST

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Hi
I have a broad band tapered coupler
I simulate it in ADS momentum but when want to simulate Full wave by HFSS and CST the result are very different from ADS result?
why?

Hi,
I use CST to simulate of tapered slot antenna (vivaldi) and when I measure the antenna (that I create by using CST), it find that the results from CST and measurement are the same. So, I no have idea about ADS.

I am having same problem with results difference when comparing genesys momentumGX results with CST MWS results.
I suppose this is because of meshing types used in momentum and CST (hexahedral mesh type) are different. In my case, I simulate coupled microstrip filter in a hairpin topology, with 75 degrees angles, so edges of lines are not parallel with CST generated mesh, this should give accuracy loss in CST.
However, I was attempting to make finer mesh into CST, and still have about 4dB S[1,1], S[2,2] difference between CST and genesys...

Would appritiate any help about why does this difference appears.

How to generate tappered profile in HFSS or CST?

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