On Jan 13, 11:23*pm, "Frank" wrote:
Frank, I am not saying he is not credible but he is part of the older
generation and there was not enough detail supplied to determine
whether I accept it on trust. When the antenna programs
throw out the yagi in favor of arrays or radiators in equilibrium form
should we throw it out in favor of conforming with the past? Yes,the
article is in line with what the older generation has lived with
but the new generation have more tools and information than the
present dying generation.
Problem with present day authors is *up against the "publish or
perish" format regure references to prior papers in quantity to
provide legitamacy to any new papers, without which they will have a
hard time publishing. Greasing the wheels of fellow contributers or
white paper authors is much preferable to declaring those who judge
are in error. Frank, a lot of the theory of antennas is either based
on vanishingly thin radiators without regard to room required for eddy
field and in some cases with transmission lines where it is possible
to get three different current flows together with a closed circuit,
yet we are now protecting the idea of non closed circuits where the
current flow
is on top of each other. No wonder it is said over the last 100 years
that we don't fully understand radiation especially when it takes over
70 posts on how to make a cantenna from a panel of experts
Best regards
Art

I would hardly call the tools used in this simulation "Older".
Ansoft produces some of the most sophisticated, and up to
date FEM software available. *I have seen Ansoft's HFSS
accurately model current flow through PCB vias, around an end-
launch connector at 20 GHz. *CST Microwave also
produces high end FEM software. *All the models are
done in full 3 D, with actual physical dimensions. *This
FEM software started to apear about 10 years ago and
costs in the range of $40,000 to $50,000, with a $10,000
per year maintenance fee.

"Publish or perish" is usually applied to university positions.
It is doubtfull that too many people are able to pubish in
the Proceedings of the IEEE, or one of the IEEE Society
Transactions.

Frank,
It has not yet been proven that current does not flow thru the center
of a radiator.
I see it as a manufactured statement to satisfy the idea of an
uncompleted circuit where the current
passes over or thru and in a different direction than the same current
that generates its existence !
It does all this where the books state it is a series circuit where
the paths taken by the current are not identical. Why manufacture all
these happenings to prove what is just a theory, while at the same
time destroying the reasoning of a closed circuit without an
explanation how such actions
creat radiation, especially when it is admitted that radiation is not
fully understood?
I think the time as come to review again from the time of Maxwell and
build up afresh in line with
a century of findings and then re evaluate.
A good start would be to evaluate why antenna programs based on
Maxwells laws provide solutions based on equilibrium while discarding
all other designs. Saying that it can't be! Because" "if true it
would have been discovered a 100 years ago" while silently adding "all
is known about antennas and the patent offices should be closed"
Regards
Art