On Dec 29, 3:16*pm, Cecil Moore wrote:
Roy Lewallen wrote:
In fact, current does quit flowing from the source.

In your example, the only way for the conservation of
energy principle to work, along with the laws of physics
governing EM waves, is for the reflected wave incident
upon the source to be reflected back toward the open
end of the stub. The forward and reflected energy simply
remains in the stub flowing end to end at the speed of
light in the medium. Anything else is impossible.

When the source impedance is the same as Z0 there
is no impedance discontinuity to produce a reflection.

Is the reflected wave reflected even without a
discontinuity?

...Keith

PS. And a circulator is not needed for the source
impedance to match Z0.