On Jan 31, 9:38*pm, "Antonio Vernucci" wrote:
The answer may be in your own text (the ground issue). There may be a
third path via ground (capacitive coupling).

Hi Wim,

I acknowledege that your example leads to an asymmetric bipole, that one cannot
reverse it without consequences.

However, in the case which occurred to me, there is no need to assume the
existence of a third path via ground for justifying the asymmetry. Actually the
asimmetry remains even if the bipole would be in free space!

Forgive me if I do not immediately reveal my case, but I would like to see if
there are some more guesses before closing the issue.

73

Tony I0JX

as long as it is ONLY 2 ports, has ONLY passive linear components, AND
is small enough to be considered a lumped element, then you can always
reverse the terminals and not know the difference. The most
frequently violated condition is the last one, put in a piece of coax
with that is long enough to be measured at the highest frequency you
will use and all bets are off.