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Using a single port S1P file to simulate a load impedance in R+JX format ?

Question asked by paulh on Aug 26, 2012
Latest reply on Aug 31, 2012 by paulh
Hello I am trying to use a single port s1p file to generate a matching network but am stuck on how to format the s1p file correctly so perhaps someone can help.

I measured the input impedance of a FET using a test fixture and a VNA at various points across the band of
interest. The data I have is in R+JX as read from the VNA display. What I would like to do is use this measured impedance data as the basis of a Load so I can create a broadband matching network.

I tried to format the S1P file like this but it does not appear to work. I believe the syntax is not correct.

#MHZ      Z                 RI            R 50
175Mhz                2.6-J23.5     
190Mhz                2.9-J22     
210Mhz                3.1-J20     

The basic idea I guess is to have a dynamic Term that is not a fixed impedance. I believe the S1P symbol is the correct one to use in ADS but I am not 100% sure. I could take the average of the measured data and put that into the term but was thinking there might be a better way to do it.

Thanks Paul