Re: NEC-LIST: Which part of the dipole radiates most?

Hi Achim,

I share your point of view:

>>The movies of the radiating dipole are very nice and impressive.
>>
>>However, since we have a sinusoidal excitation and are interested in
>>the stationary solution, I think an answer to the question about the
>>radiating part of a dipole is rather given by the real part of the
>>complex Poynting vector, which represents the time-average power flow
>>and thus is not time-dependent.

>From the rough jpg at

  http://members.home.net/propagation/Poynting.jpg

which shows the upper half of a transmitting vertical orientated half
wave dipole, you find the EM energy (.5 Re(E x H)) flowing as some
kind of guided lossy (by radiation) wave along the wire. But the flow
takes off from the radiating structure over its full length. So, its
obviously not the only centre or only the ends (like the great Marconi
assumed) of the antenna element which radiate, but the whole antenna.
(the fields were calculated using NEC-4)

Kind regards, vy 73

Joachim
Received on Tue Mar 07 2000 - 04:26:35 EST