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Old August 24th 03, 09:36 PM
W5DXP
 
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Peter O. Brackett wrote:
s11 is a reflection coefficient that has the special condition that
a2 must be equal zero. When a2 is not equal zero, the s11 reflection
coefficient and the apparent reflection coefficient (rho) are not the same.


No! The scattering paramters, e.g for a two-port the s11, s12, s21 and s22
are all parameters fixed by the network and are not dependent upon either
the independent or dependent variables! i.e. b1 = s11*a1 + s12*a2, and b2
= s21*a1 + s22* a2.


I'm sorry, Peter, but you probably misunderstood me. s11 cannot possibly
be the same as 'rho' when a2=100 watts.

s11 = b1/a1 when a2=0.

b1 is equal to something else if a2 is not zero.

rho = Sqrt(Pref/Pfwd)

These do NOT have to be the same values. That's all I was saying.
--
73, Cecil http://www.qsl.net/w5dxp



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