Reg is correct. Even a very short structure, much shorter than a
wavelength, acts like a transmission line. A short structure just acts
like a short transmission line. It's just that if it's short, there are
simpler ways to analyze it which will get us essentially the same
answer. But we can use full blown transmission line analysis on any
structure if we choose, and should get the correct answer.

Roy Lewallen, W7EL

Dave wrote:
EVERYTHING????

I thought there is/was a restriction that "Everything" must include "a
significant portion of a wavelength".

:-)

Reg Edwards wrote:

EVERYTHING has Inductance, Capacitance and Resistance, and therefore
behaves as a transmission line.
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Reg, G4FGQ