Cecil Moore wrote:
wrote:
Just to make sure I understand correctly, are you saying that
Vrev^2/Z0 can never be greater than Vfwd^2/Z0
(these being the common definitions of Prev and Pfwd) or did
you have another set of defintions in mind for Prev and Pfwd
when you state that Prev can never be greater than Pfwd?
Assuming a single source, single feedline, a passive load,
RMS voltage, and a real Z0, yes, average Prev can never be
greater than average Pfwd, i.e. the total Poynting vector
can never point away from the load. Such would be a violation
of the conservation of energy principle.
Yes indeed. But in the original example Z0 was complex. So once
again, with the clarification that the following question was
phrased in general terms and not constrained to lines where
Z0 is real...
Just to make sure I understand correctly, are you saying that
Vrev^2/Z0 can NEVER be greater than Vfwd^2/Z0
(these being the common definitions of Prev and Pfwd) or did
you have another set of defintions in mind for Prev and Pfwd
when you state that Prev can NEVER be greater than Pfwd?
....Keith