Cecil Moore wrote:
Roy Lewallen wrote:

Here's an interesting quote from _Transmission Lines, Antennas, and
Wave Guides_, by King, Mimno, and Wing: *It is fundamentally incorrect
to treat a center-driven antenna as though it were the bent-open ends
of a two-wire line.*


Funny, I thought Maxwell's equations worked for either case. Did you also
know that *It is fundamentally incorrect to treat a wolf like a dog.*

If you slowly increase the spacing and angle between the two conductors
of a transmission line, at exactly what spacing and angle does it magically
cease being a transmission line and become an antenna requiring a
completely
different treatment? Please be specific as to the exact spacing and
angle at
which it becomes "fundamentally incorrect" to treat the configuration as a
transmission line. Incidentally, I don't usually use circuit theory for
transmission lines.

That question is a lot like asking for the exact speed an object has to
be moving before non-relativistic becomes invalid, or how small before
quantum theory has to be used.

I maintain that the authors of that book know more than you do about the
topic by at least an order of magnitude -- more likely about three. If
you really want to know the answer to your silly question, you should
study what they've written and try to understand it, rather than posting
it as a question to me on this newsgroup.

. . .

Roy Lewallen, W7EL