It may be OT a bit, but it's worth another post. I think you are
comparing apples, not with oranges but with the apple tree, and the
resemblance is far less. Of course, the magnetic field strength at the
surface of, or close to, an antenna feed conductor is very high, but
that's not what I'm considering, which are the E and H field strengths
at a distance from the antenna but within the near-field region.
Analysing the dipole case is more difficult (for me) than the solenoid
case. For the latter, the electric field comes from the voltage across
the solenoid, which can be very low if its resistance is low, but if its
diameter is small and the number of turns is large, the magnetic field
strength at a distance on axis can be very large even with a modest current.
There is some (but not enough) information about this in Annex A of the
2008 edition of IEC/EN 62311, but it is not in the new 2019 edition.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-10-29 00:10, Ken Javor wrote:
Re: [PSES] Reading or Limit Conversion? Completely off-topic, but...
The input impedance of a tuned dipole is 72 Ω. That looks more
magnetic than electric compared to 377 Ω. Also, if you are in close to
the tuned dipole, then you would see magnetic at the center (current
maximum) and very high electric at the tips (no current at all).
Now if we are talking an electrically short dipole, then yes, it’s
pretty much all electric.
Ken Javor
Phone: (256) 650-5261
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