[Keysight ADS tips] Calculate characteristic impedance (Z0) and propagation constant, (Gamma)

* to calculate characteristic impedance, Z0, of a transmission line :

simply copy and paste the following equations into ADS Data Display
abcd=stoabcd(S)
z0=sqrt(abcd(1,2)/abcd(2,1))
Of course, you have to run S-parameter simulation in ADS schematic

* To calculate propagation constant (Gamma) of a transmission line

Gamma=acosh(abcd(1,1)/(TLleng))
where TLleng is the length of the line.
Once Gamma is obtained, attenuation constant can be known as well. remember to convert the unit into dB.


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Schematic is shown below. I here use ideal transmission line as an example. Of course we can replace it to a microstrip line or any s2p files such as EM simulation results.

Copy and paste the equations in Data display window:

Have fun with ADS


* for TEM mode only, lossless transmission line assumed




--reference
Pozar textbook

Wiki : Characteristic impedance,