Roy Lewallen wrote:
My analysis shows that fP - rP can have a negative value for some
load impedances when Z0 is complex. Please pay careful attention,
though, to the definitions of these terms. As I used them, fP = Re{fE
* fIc} and rP = Re{rE * rIc} where I'm using subscript c to denote
complex conjugate to avoid confusion with "*" for multiplication, and E
and I magnitudes are RMS. Although I didn't prove it in my analysis, the
total net average power, which includes a third average power term, into
a passive load of course can't be negative.

Chipman's third term in equation 7.34 certainly resembles Dr. Best's third
term in his equation 12. Dr. Best's third term is known to be an interference
term. It's a good bet that Chipman's third term is also an interference term.

Incidentally, if that third term is flowing toward the load (as it has to be)
it is forward power. So fP is obviously not all the forward power.
--
73, Cecil http://www.qsl.net/w5dxp



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