wrote:
1.) Cecil wants everyone to start using reflection wave models to
analyze every antenna system in the world.
No, I simply want you and others to stop using a known invalid
model for every standing wave antenna system in the world.
This is a quote from the first web page below: The capital
letters are where the author used bold italics for emphasis.
"... - no wave interferrence and no standing waves can be
present on lumped elements. The problem has been that many
experimenters working with self-resonant helices have
PURSUED THE CONCEPT OF COIL SELF-
CAPACITANCE WITHOUT REALLY UNDERSTANDING
WHERE THE NOTION COMES FROM OR WHY IT WAS
EVER INVOKED BY ENGINEERS. For that, they will have
to go read R.W.P. King's wonderful old book, "Electromagnetic
Engineering, McGraw-Hill, 1945. ... On page 465, the Harvard
Professor points out that, for coils whose *wire length* exceeds
1/6 wavelength, ...'an adequate representation of the reactance
of a coil with a nonuniformly distributed currentr is NOT
POSSIBLE in terms of a coil with a uniform current [a lumped
element inductance] ...' Period. Resonant FIELDS present
surprises to engineers with limited training."
Certainly sounds like he is talking about you, Tom. "Electronic
Engineering" was written before you were born. Why are you
ignorant of the technical facts presented in it?
http://www.ttr.com/corum/index.htm
http://www.ttr.com/TELSIKS2001-MASTER-1.pdf
The .pdf paper is a pier-reviewed publication by the IEEE. Here's
what it says about the model you have chosen to use.
"Of course, the uniform current assumption has no validity for coils
operating anywhere near self-resonance!"
"The failure of any limped element circuit model to describe the
real world lies at its core inherent *presupposition*: the speed of
light is presumed to be infinite in the wave equation. ... Consequently,
lumped element circuit theory does not (and cannot) accurately
embody a world of second order partial differential equations in
space and time."
"The concept of coil "self-capacitance" is an attempt to circumvent
transmission line effects on small coils when the current distribution
begins to depart from its DC behavior."
"There are a great number of formulae for coil self-capacitance.
None are of particular value for quarter-wave helical resonators
anywhere near the 90 degree point."
"The delusion is that the short coil is then made to operate in the
lumped element regime ...".
That you refuse to give up on an invalid method in the face of
overwhelming evidence is amazing.
What he wants me or others to do is a moot point.
Afraid of what you will find? The first web page above says:
"Lumped circuit theory isn't absolute truth, it's only an analytical
theory - and in these resonators we have the case where this
sophmore theory fails experimentally." Do the experiment, Tom,
and discover exactly how sophmorish you are being.
I am concerned about the commonly held but very incorrect view that
current travels through an inductor turn-by-turn, and that a loading
inductor somehow shifts the phase of and/or level of current to "make
up for missing degrees".
Tom, that's what any matching network does. Loading coils are no
exception.
My only concern is people not understanding how an inductor and short
antenna actually behaves.
I am concerned about you not understanding, Tom. Don't
you believe the information posted on those web pages above. Don't
you think a peer-reviewed IEEE publication that disagrees with you
is worth a second thought from you. Don't you think ignoring the
knowledge published by experts in the field is a little naive?
--
73, Cecil, W5DXP