Roy Lewallen wrote:
1. That the voltage reflection coefficient is the ratio of reverse to
forward voltage.
For those promoting some other formula for voltage reflection
coefficient: Which of the above assumptions is false?

Number 1 is not always true for s11, the s-parameter reflection
coefficient.

What substitute assumption is true?

For an s-parameter analysis, it's that s11 = b1/a1 when a2=0
Your definition above says that rho = b1/a1 no matter what
the value of a2. Some configurations have rho = s11 and some
don't.

There are differences between your transmission line analysis,
an s-parameter analysis, an h-parameter analysis, a y-parameter
analysis, or a z-parameter analysis. If they were all alike,
there would be no need for their separate existences. FYI:

s11=[(h11-1)(h22+1)-h12*h21]/[(h11+1)(h22+1)-h12*h21]

s11=[(1-y11)(1+y22)+y12*y21]/[(1+y11)(1+y22)-y12*y21]

s11=[(z11-1)(z22+1)-z12*z21]/[(z11+1)(z22+1)-z12*z21]

s11=Vref1/Vfwd1 when Vref2=0, i.e. Pref2=0
--
73, Cecil http://www.qsl.net/w5dxp



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