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Agilent ADS: FR4 Vs PTFE

Question asked by imett on Jul 25, 2008
Latest reply on Jul 29, 2008 by dgun
i've to make a Rf amplfier up to 2GHz and i need to compare two type of board for the PCB: the lowest in FR4 and the highest in PTFE.
When i put the dielectric constant for the two type of material  FR4(er=4.4) and PTFE (er=2.02 ) the S21 give me the same result. (i also make the right wire impedence adjustment)
I think that the software use a costant er for all the frequency and this isn't correct for the FR4 board!
Let me know if i'm wrong.

Thanks matteo