rickman wrote:
On 8/1/2015 8:31 PM, wrote:
rickman wrote:
On 8/1/2015 4:52 PM, wrote:
rickman wrote:
Here is a more basic question. What are the assumptions to be able to
say the current on the shield inner layer equals the current in the
inner conductor of a coax? I'd be willing to bet I can construct a
circuit where this is not true.

Inside the transmission line the energy is carried in the electromagnetic
field between the conductors, not in the conductors.

https://en.wikipedia.org/wiki/Transm...#Coaxial_cable

Nothing external to the transmission line can chage this.

Um, do you want to answer the question about the assumptions required to
assume equal currents in the two conductors of a coax? If not that's
fine.

I did; there is no current in the conductors of a coax where those
conductors physically define a coaxial transmission line.

https://en.wikipedia.org/wiki/Transm...#Coaxial_cable

There is current in the conductors only after they no longer physically
define a coaxial transmission line.

Inside the coaxial structure everything is in the field and is balanced.

Do you have any references that actually say there is no current flow in
a coax? The reference given above doesn't even come close to saying this.

What it says is where the energy IS, not where the energy is NOT.

Read and understand the differential equations here and it becomes obvious:

https://en.wikipedia.org/wiki/Transm....27s_equations

--
Jim Pennino