Why using cascadesparams() to combine two s4p touchstone file is different from ADS (Advanced Design System | Keysight) cascade two s4p?

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Hongjun Chen
Hongjun Chen 2020-8-15
I use the cascadesparams() function to cascade some s4p touchstone file,but the result is error,its sparameters is different from the ADS software to cascade the same S4P file.
But if cascade the s2p touchstone file ,the result is same as the ADS software output.
How can I correctly cascade some s4p touchstone file ?
the code:
[A,pathname,index]=uigetfile('*.s4p','pick','MultiSelect','on');
if ~iscell(A)
if A==0
return;
end
end
for ii=1:2
apathname{ii}=strcat(pathname,A{ii});
end
S1=sparameters(apathname{1});
S2=sparameters(apathname{2});
S=cascadesparams(S1,S2,2);

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