Cecil Moore wrote:
Roger wrote:
Cecil Moore wrote:
Roger wrote:
Stored in the 1/4 WL between the short and mouth. No more current
needed once stability is reached.

EM RF current is stored in the stub? In what form?

Come on Cecil! Let's not go around in circles! You know very well how
it happens.

Here's an example using a circulator and load in
a 50 ohm system. Please think about it.

SGCL---1---2------------------------------+
\ / | 1/4
3 | WL
| everything is 50 ohms | shorted
R | stub

Are there any reflections at point '+'?

If not, how is energy stored in the stub?

If so, what causes those reflections?

I am not sufficiently familiar with circulators to respond. My present
level of understanding is that they can only be built using ferrite
inductors which have an ansiotropic (non-linear) magnetic response. If
so, they could not be compared to transmission lines without adding that
non-linear factor. Apparently energy is stored in these inductors only
if the power is moving in one direction, so it never reaches one branch.
I don't understand how a ferrite could do that.

Is there such a thing as a "all transmission line" circulator? If so,
where could I find the circuit?

Thanks,

73, Roger, W7WKB