Keith Dysart wrote:
Now if you want to recover, make some better
attempts to write the rule. Look back through
the posts for your sentences that begin with
"Can we agree that", or some such. These
were your attempts at a rule. Complete them
to the point that we agree that they are self
consistent and accurately convey your
definition and we will have gotten somewhere.

What is it that you need a rule for? Is it the
electrical length of a stub?

The stub is electrically half as long as the phase
shift undergone by the reflected wave during its
round trip to the open or shorted end and
back to the feedpoint.

If that phase shift in a dual-Z0 stub is the same
as the phase shift in a single-Z0 stub at the same
frequency, the two stubs are the same electrical
length at that frequency.
--
73, Cecil http://www.w5dxp.com