Re: VNA Resonance Methodology
¿ªÔÆÌåÓýFinally I got some time to perform measurements. I used an E5061A VNA (a nanovna can be used as direct replacement, this is nothing special). I started calibrating my port 1 on SMA male. I build a simple coil over a plastic form and I used a 160pF mica plate capacitor in series. I got a series resonance frequency of fs= 2.718 MHz and ?a series resonance due pasitic capacitance (Cp) of fp=15.757 Mhz. I used segmented sweep to have more frequency resolution at fs.? If I short the coil and I measure the capacitance ?this is ?@fs C= 162.14 pF performing some calculations* Cp = 4.97 pF ?, then we can compute L = 20.518 microH at fs the series resistance was Rs= 2.314 ohm and this is Q= 151. There are more information on attached pictures.? If we not consider the Cp(=0) ¡ the results are : L= 21.147 microH Q= 156.? *The series capacitance is close to the ratio of fp and fs squared minus one times Cp : C= ((fp/fs)^2 -1) Cp ? Ing. Patricio A. Greco Laboratorio de Calibraci¨®n ISO 17025?AREA: RF/MW? Gral. Mart¨ªn Rodr¨ªguez 2159 San Miguel (1663) Buenos Aires T: +5411-4455-2557 F: +5411-4032-0072
|
Patricio A. Greco
