Uzytkownik "K1TTT" napisal w wiadomosci
...
On May 7, 7:49 am, "Szczepan Bialek" wrote:

Radio waves from the dipole are polarized. Does it mean that light
is
emitted by a dipoles?

sure, why not? but polarized waves can be emitted from other things
also.

We can shield the one end of the dipole.

no you can't.

A whip antennas on a car is not such?
no, the other half of the dipole is the body of the car itself.

Have you ever seen the dipole which one end is without a cap and the
other
with the huge cap (the body of the car?
The body is rather a mirror for the monopole.


Why the dipoles exhibit the directional pattern?

because they do, its well measured and accurately described in the
equations.

Are the measured and the calculated from the equations in agreement?
yes, to within many, many decimal places... if they did not agree to

within the limits of measurement then someone would have had to make a
new theory to explain the difference.

No such need. For the radio waves apply all knowledge for the acoustic
waves.
The monopole works like the Kundt's tube. The dipole like the two.
The directional pattern is the same for two loudspeakers like for the
dipole.
S*

wrongo buckaroo. there is no such thing as a monopole... when you
have a feedline are there not always 2 conductors? search for some
basic circuit theory about current and voltage sources, you will see
they always have 2 ports. there must always be a return path that is
the other half of the dipole, even if you can't see it as such. all
antennas derive from the infinitesimal dipole which when degenerated
even father can be represented as a single oscillating charge. it
always goes back and forth or around in circles to create the
propagating wave,

Yes. But one end of the dipole may have the better conditions to propagate.

if it only moves in one direction as it would have
to in a monopole there is no wave only a simple field.

I am writing about a dipole with one end visible and the second shielded.

In nature is always as you wrote. The both ands are always "visible".

Light is always directional. Radio waves can be omnidirectional.
Of course light is emitted by many dipoles. Radio waves by halve, one, two
(circular polarity) or many (phase radar).
S*