K7ITM wrote:
....
...and there are
some good applications notes from HP about S-parameters, and about RF
measurements in general. You should be able to find many of them on
the internet, with a bit of searching.

Of course you'll have to search at Agilent.com since 'HP' no longer
exists with regards to the the test and measurement world, but to get
you started,

'S-Parameters... Circuit Analysis and Design' a/k/a AN-95, an oldie but
a goodie,
http://cp.literature.agilent.com/lit.../5952-0918.pdf

Enjoy!
- Galen, W8LNA

On Apr 10, 4:21 am, "ilam" wrote:
I am in a process of understanding the importance of S-Parameter at
high frequencies, please answer my following questions:

1. Why Measuring a wave (voltage or current) is more easier than
volage and current? ( Why measuring S-Parameter is more easier than
other parameters?)

2. How the voltage and current waves are measured?

Measuring voltage and current are difficult at high frequncies, that
is why S-Parameter is more useful at high frequncies. Is the same
thing is true for simulation?

Regards,
Ilam

Search the agilent website for the original application note on S-
parameters.. it provides a great explanation of why S-parameters are
used.

You've correctly assessed the situation.. at microwave frequencies,
it's much easier to measure forward and reflected signals (and
calibrate for non-ideal directional couplers, etc.) than to measure
voltage and/or current.