Here is some more stuff to contemplate.
I "modeled" so to speak the inductor under test, the DUT, as a perfect inductor. No SRF.
I added the measured fixture parasitic obtained from the "perfectly calibrated VNA". I cascaded these elements into the simulator and as expected, looking into the VNA port, port 1, we return a S11 and an equivalent parallel inductance of 1.3 uH. As measured our 1 uH inductor appears as a 1.3 uH inductor and reasonably constant at low frequencies as long as we stay well below the SRF... Huh! What SRF? I stated the SRF of the inductor was NOT present. Well, it is not, but the fixture has created its own! Namely the 10 pF fixture C shunts the 1 uH and there is a MEASUREMENT SRF introduced. Proper de-emdedding if you keep your wits together will permit you to get the proper answer right through and past the resonate point introduced by the FIXTURE! This example exemplifies how KEY fixture details are and if not considered, will render measurement error.
Alan
