Roy Lewallen wrote:
Ed Cregger wrote:

You appear to be extrapolating, if I see this correctly, that since
all of the radiation is believed to come from one end of the dipole,
then the rest of the antenna is merely acting as the necessary
reactances and resistance needed to obtain the proper feedpoint
impedance at a given frequency. True?

No. It's not true that all the radiation "comes from one end of the
dipole". Extrapolation from that mistaken premise will lead to invalid
conclusions.

Following that line of reasoning, if the need for the aggregate
reactances/resistances can be eliminated via superconducting elements,
one will have just a single point source of radiation. Or, what is
commonly known as an isotropic radiator. I suspect that the plasma
antenna fellows are contemplating this too.

And there's the first one. . .

Roy Lewallen, W7EL


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You are the acknowledged expert here (we're not worthy!!!).

What is the flaw in the proposed thinking? You have to admit that lots
of the commercial antenna companies and ham publications either do, or
used to, emphasize the point that "most of the radiation of a 1/4 wave
ground plane antenna (half of a half wave) occurs near the feed point".

Instead of just saying, no, this thinking is incorrect, how about
teaching your students (includes me) precisely what is wrong with this
line of thinking. Not at the engineering level necessarily (oodles of
formulas), but in the analog/real world level.

Please?

Be merciful, oh great one. I'm on enough prescription drugs to put half
a football team to sleep, so, occasionally, I get quite tangential to
the topic at hand. I hope this isn't one of those times. G

Thank you, oh merciful one.


Ed, NM2K