Hello Kurt, and others,
I still haven't build a robust fixture, but experimetally taking some measurements on EMC bead, or right now on a wire-wound inductor with a 3mm ferrite core for EMC application.
I was assuming that the results of measuring Z (S11 channel 0) will closely match the results on measuring Gain (S21 channel 1).
So basically I soldered the coil between two SMA connectors and have the SMA cables connected to Ch0 and Ch1.
For some reason the frequencies of max. Impedance S11 Z (Ch0) do not even closely match the frequency of min. S21 Gain (Ch1).
Z on Ch0 shows max. Impedance at around 140 MHZ, but min. gain is around 260 MHz.....
When connecting Ch0 and Ch1 directly the S21 gain looks pretty good (flat at 0db)
What am I doing wrong or let's say, what is my misinterpretation of S11 Z and S21 Gain?
Or is something wrong with the VNA ?
