I have a question regarding scattering parameters. How can I extract the impedance of a two port device (Diode) out of a two port S-parameter measurement?
When using one port S-parameter measurement, Z is calculated by transforming the S11 to Z for a specific working point and frequency. Is it correct to transfer the S12 or S21 (which are (almost) identical by a Diode) to Z to get the impedance of the device?
When using one port S-parameter measurement, Z is calculated by transforming the S11 to Z for a specific working point and frequency. Is it correct to transfer the S12 or S21 (which are (almost) identical by a Diode) to Z to get the impedance of the device?
If you have a working diode, s21 and s12 should be quite different! One correct way would be to transform your s-parameters to y-parameters and use the pi-model. The shunt elements of the model are y11+y12 and y12+y22 and the series admittance is -y12 or -y21. This would be the transfer addmittance you are looking for, i think.
It is an ordinary diode but for higher frequencies
Why should S21 and S12 be quite different, diode is a 2 port device!
I wasn’t that sure if -y12 or -y21 of the pi-model is enough . Wouldn’t it be better to use the average of y12 and y21, what do think?