[TowerTalk] S21 to Rp & Cp - Equivalent Circuit
jimlux at earthlink.net
Sun Jan 7 17:01:54 EST 2018
On 1/7/18 12:59 PM, Máximo EA1DDO_HK1H wrote:
> Hi all,
> I know there is a formula to get Rp and Cp from S21 or S11 data (LogMag and Phase, or R & I).
Convert S11 from logmag, angle to complex
Z = Z0 * ((1+gamma)/(1-gamma))
that gives you R+jX series form R and C/L
You then have to convert to the parallel form
Rp = Xs*(Rs/Xs+Xs/Rs)
Xp = Rs*(Rs/Xs+Xs/Rs)
The Rs/Xs+Xs/Rs is common to both, so in excel, adding a column for that
makes it easier.
> Anyone know that formula?
> It is to use it in Excel and get Rp and Cp from the VNA´s exported data.
> Thank you very much
> 73, Maximo
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