Re: NEC-LIST: E-M demos/simulations/animations

Steve Inge wrote:
>
> I have just come home from ACES-2000. Ed Miller and John Schaeffer
> gave a full day short course on "Where does the radiation come from".
>
> The cute answer, but accurate, is "radiation is caused by the
> acceleration of charge."
>
> For a half wave dipole, this is where the travelling charge reverses
> at the dipole ends ...

But there are no travelling charges at the dipole ends. The current is
zero at those points. You have to go about 1/4 wavelength away from
the ends. For a half wave dipole, this is its center! The current,
and also its time-derivative (accelleration of charge) are highest in
the centre. If Ed and John are right, the radiation should come from
the centre.

  See: http://home.iae.nl/users/bergervo/gouy/dipole.html

Greetings,
Jos

--
  Dr. Jozef R. Bergervoet                      Electromagnetism and EMC
  Philips Research Laboratories,             Eindhoven, The Netherlands
  Building WS01                                     FAX: +31-40-2742224
  E-mail: bergervo_at_natlab.research.philips.com    Phone: +31-40-2742403