AB7E said:
"Any thoughts on this text fixture?"
Dave, use the Y21 method instead of the conventional S21 method to
suppress any shunt capacitance in the test fixture. This S-parameter
plotter implements both methods. Scroll down to see a comparison of
results for the two methods for a common-mode choke:
https://k6sti.neocities.org/sp
K6JCA's explanation and derivation of the Y21 method:
https://k6jca.blogspot.com/2020/07/the-y21-method-of-measuring-common-mode.html
Brian
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