Hello Roger,
I thought that the method I used now for the resistors was working. And it
seems to work at least for these 4 resistors (330, 985, 5160 and 21800);-)
But I now did a 1:1 Guanella choke as dut and it seems to behave
differently in a 2 port measurement...
Here are the 2 port measurements NanoVNA Saver of my 1:1 Guanella choke (I
also attached the 11Guanella-corebraid-1s21.s2p file):
[image: afbeelding.png]
As you can see the S21 R+jX has totally different form (e.g. peaks) than
S11 R+jX.
If I use the formula of (Page
10) :
[image: afbeelding.png]
I can determine with the 2 port measurements Zdut (Zx) in two ways through
S11 and S21 2 port measurement.
Z2pseries(S11)=(Zsource+Zload)*S11/(1-S11)
Z2pseries(S21)=(Zource+Zload)*(1-S21)/S21
[image: afbeelding.png]The green curve should be close to the red (blue
dotted or orange dotted) ones (as when using my method for the resistors),
but with the choke they are totally different. I must be doing something
(obviously?) wrong! But what? Any help is welcome.
All the best,
Victor
