Hi! I sent a post showing how to measure resonance and self resonance and I calculated all parameters of a resonant circuit using almost any VNA. The self resonance is the parallel resonance when you connect a series LC to VNA port. The resonance conditions becomes when the imaginary part of S11 becomes zero at a determined frequency… in the attached picture there are both the serial resonance frequency on marker 1 and parallel on marker 2. Parallel resonance result of parallel connection between L and Cp with is the parasitic capacitance , this is the self resonance frequency. The method is absolutely sensitive to calibration I recommend very good standards.
I don´t know about your application but self resonance are very unstable depending on dielectric properties of the form ( many times varies with temperature and moisture) and changes every time. The best is to have this resonance frequency very far from working frequency using a very well known capacitor.
If you need to know the self resonance to have the value of Cp parasitic capacitance its a very good method but there are other methods that gives it value at the work frequency. Cp frequency dependent. I showed a method to do it on other post , this is derived from a procedure with Q-meter.

If you need more details just let me know more about your interest.


Ing. Patricio A. Greco
Laboratorio de Calibración ISO 17025 AREA: RF/MW
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T: +5411-4455-2557
F: +5411-4032-0072
www.servicios-electronicos.com.ar