Richard Harrison wrote:
me wrote:
"So...is there a 180 degree phase change at the reflector?"

Yes. The incident and reflected components of electric field exactly
cancel at the surface of a perfect reflector due to the short-circuit.

But the incident and reflected components of the magnetic field don't.
Is that cool or what?

Roy Lewallen, W7EL

Roy Lewallen wrote:
Richard Harrison wrote:
The incident and reflected components of electric field exactly
cancel at the surface of a perfect reflector due to the short-circuit.

But the incident and reflected components of the magnetic field don't.
Is that cool or what?

It's simply another example of the conservation of
energy principle in action.
--
73, Cecil http://www.w5dxp.com

Roy Lewallen wrote:
"But the incident and reflected components don`t. Is that cool or what?"

Cecil wrote:
"it`s simply another example of the conservation of energy principle in
action."

Yes. When a radio wave encounters a short-circuit, a reflection takes
place with reversal in phase of the voltage but with no change in phase
of the current. Voltage cancels and current doubles at the
short-circuit. Reflection reverses the wave`s direction of travel
because only one of the wave`s components has had a phase reversal but
not both. Sinultaneously reversing the phase of both wave components has
no effect on the direction of wave travel.

Best regards, Richard Harrison, KB5WZI

Roy Lewallen wrote:
Richard Harrison wrote:

me wrote:
"So...is there a 180 degree phase change at the reflector?"

Yes. The incident and reflected components of electric field exactly
cancel at the surface of a perfect reflector due to the short-circuit.


But the incident and reflected components of the magnetic field don't.
Is that cool or what?

Just falls out of the fact that while there's no voltage (the perfect
conductor enforcing a constraint of E=0) there can be current flowing,
so there can be a net magnetic field.

of such cool stuff are things like the reversal of CP sense made.