Analyzing Stub Matching with Reflection Coefficients
Cecil Moore wrote:
Cecil Moore wrote:
x
a1=10----|
|----s21(a1)=5 toward the load
s11(a1)=5----|
For those of you who are unfamiliar with the way s-parameter
voltages are normalized, here are the *actual measured*
voltages at the impedance discontinuity at t=0 + delta-t.
All three voltages can easily be seen on an o'scope a
short time after t=0. During the buildup to steady-
state Vref1 goes from 50V to 0V. How that is possible
without interaction is the question for ac6xg.
x
Vfor1=70.7V----|
|----120.7V=Vfor2 toward the load
Vref1=50V----|
rho1-- | --tau2(Vref2)=0
The corresponding equation used by RF engineers is:
Vref1 = rho1(Vfor1) + tau2(Vref2)
In this t=0 case, Vref2=0, so
Vref1 = rho1(Vfor1) at t=0
Cecil,
I am impressed! That's a pretty fancy o'scope you got. Measurement of
voltages to four significant digits at t = 0 + delta-t is definitely
world-class. That 291.4 ohm line is pretty special as well.
Is there some non-standard definition of *actual measured* that we
should consider to help interpret your results?
8-)
73,
Gene
W4SZ
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