"Dr. Slick" wrote:
wrote in message ...
Cecil Moore wrote:
wrote:
And yes, |rho| can be greater than unity for a passive load.
But the power reflection coefficient cannot be greater than 1.0
which is what the argument is all about.
Which is entirely consistent with my previous statement:
It follows that when rho is greater than unity, it is not 'physically
meaningful to separate the total power as the sum of the incident and
reflected power' so the equation
|rho| = Sqrt(Pref/Pfwd)
has no meaning.
It certainly does, because the ratio Pref/Pfwd is directly related
to the
ratio [rho]. Consider that after the absolute value brackets, the
phase information is gone. But since we are going to a ratio of
average (RMS)
values OR peak values of power, it doesn't matter.
Are you gonna re-write some books?
Don't think I need to. But many need to read their books with more care.
The root question is:
Do Prev and Pfwd have physical meaning?
or
Are Prev and Pfwd just poorly named quantities which are useful
in certain (common) circumstances?
Once you settle on the latter definition, your difficulties will
disappear and you will be free to experience rho through its full
range of values.
The proof that Prev and Pfwd are not, in general, physical things
has been offerred on many recent threads.
Although useful, it is unfortunate that Pnet does equal Pfwd-Prev
for many common situations since people are tempted to generalize.
The belief then becomes so ingrained, that when examples are
presented which demonstrate the lack of generality, the
example is rejected, or the equations modified, rather than
examining the incorrect beliefs which lead to the difficulties.
....Keith
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