Re: H F S S vs C S T
I have never tried CST, I must admit.
But when I hear people are saying something like: HFSS is fast for narrow band it sounds so untrue.
HFSS was very slow for what ever I tried it, and I am dealing with pretty simple models, and not wideband. I didn't dare using it on complex problems. Is it faster than CST I don't know, but it's very slow, that I know for sure.
As far as SCT, I don't know, although I believe they are surely faster than HFSS for wideband due to the nature of time-domain simulation, and low speed of HFSS.