Here is a suggestion to provide terrific help with all kinds of math
calculations. Mathcad is an excellent program that I have used for many
years. It should be easy to find an older version such as 4.0 or 6.0 at
very low cost which will do just about anything you can think of (I have
version 12.0). This software is easy to get started with and can be learned
more deeply with experience. Be sure to get the User Manual also. The
equation that you illustrated is a piece of cake using Mathcad and complex S
parameters. And the complex values of Z11 can be graphed on a polar or xy
plot by the program over a wide frequency range.

Amazon.Com has a 6.0 version for $40 at this time (Sunday mornng). Be sure
to get the User Manual.

Bill W0IYH

wrote in message
oups.com...
Hi,

I'm quite comfortable impedance matching to
large signal series equivalent impedances, when i
get them in data sheets. No problem, even when i
have to extrapolate a bit.

However, sometimes you only get scattering
parameters. So we could use this formula:

Z11=((1+s11)*(1-s22)+s12*s21)/((1-s11)
*(1-s22)-s12*s21)

Etcetera. But i don't wanna do vector
math all the time. And i also don't wanna
graph this gamma on the Smith chart by hand.

So i was wondering if there was a program
out there, that will do this calculation
for you?

Thanks in advance!


Dr. Slick