With band pass filters you tune for center frequency using caps, then
impedance (match, return? loss) with turns on primary.
Anything better than -20db RL is good.? Outside the band pass
anything can be true and normal.
If the filter is properly tuned the input RL is a function of load match
and of the load is 50 ohm resistor then the input match should be
good if the construction is symmetrical and not excessively over
coupled.
So for testing the filter load should be 50 ohms anything else is
questionable.? That means insuring the VNA input is a 50 ohm match.
That is usually assured when SOLT cal is done with the cables in place.
Allison
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