Jim Kelley wrote:
Cecil Moore wrote:
(Rhetorical Question)
Given that the coil section resembles a high-Zo transmission line with
reflections, how can the current into the coil section be equal in
magnitude and phase to the current out of the coil section?

Maybe it's a half wavelength long? ;-)

Strangely enough, that won't do it, Jim. A coil equivalent to 1/2WL
reverses the phase of the current such that current is flowing into
both ends at the same time. According to some gurus, that violates
Kirchhoff's laws. But Kraus shows how phase-reversing coils are
used in collinear arrays. Reckon Kraus knows he is violating Kirchhoff's
laws?

For a real-world air-core coil to exhibit identical currents at the
input and output, it would have to be one wavelength long, lossless,
and non-radiating. That's a pretty tall order just to support an
old wives' tale. :-)
--
73, Cecil http://www.qsl.net/w5dxp



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