On 6/24/2011 8:52 AM, Cecil Moore wrote:

When the single-port model is used, if the impedance is not an
impedor, i.e. if the impedance is virtual, the reflection coefficients
are virtual reflection coefficients that do not reflect anything and
do not absorb power. I will repeat an earlier assertion:

Since a virtual impedance is result of the superposition of a forward
wave and a reflected wave, a virtual impedance cannot re-reflect the
reflected wave, i.e. one cannot re-reflect the reflected wave while at
the same time the reflected wave is being used to generate an
impedance. It has to be one or the other. Otherwise, there is a
violation of the conservation of energy principle. RF EM ExH energy
cannot be used simultaneously to generate a virtual impedance while at
the same time being re-reflected.

If the reflected wave is re-reflected, it must be by an impedance
other than the virtual impedance generated by the reflected wave
itself. If the reflected wave is being used to generate a virtual
impedance, it cannot at the same time be being re-reflected.

I disagree. There are 100W supplied by the source and 100W consumed by
the load. There are 200W in the 291.4 ohm line. 100W of that is just
"passing through". The other 100W is circulating, that is, stored energy
which was put there by the start-up transient. If it is circulating,
then it must be reflected from each end of the 291.4 ohm line.

Cheers,
John