I suspect what you have there are RF/IF transformer(s)?with tuned primary and untuned secondary.?
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If there is a tap on the primary, the center pin of the three pin side, it is used to feed supply voltage to
the active device.?
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I would remove one side of the primary dog bone cap and take a low frequency?
measure of the primary and secondary inductance values. Get this from a S11 shunt measurement.
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Then while taking? a measurement of the primary inductance (S11), place a short circuit on the secondary side
and re measure the shift in the primary L value, again from S11. The primary L value should decrease and this?
shift in L provides the coupling coefficient. This value obtained from SQRT [(1-L_primary_sc/L_primary_oc)]. Again,
primary L is the measurement, shunt mode, S11.... while the secondary is OC and then SC.?
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Given all this one can ascertain the frequency response analytically with the dog bone C value provided and?
an assumption on the secondary termination Z.?
