Uzytkownik "tom" napisal w wiadomosci
et...
On 2/12/2011 12:23 PM, Szczepan Bialek wrote:
napisal w wiadomosci
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On Feb 12, 8:55 am, "Szczepan wrote:

The field emission take place where the voltage exists. But at the end
the
voltage is doubled (standing wave). So the strong radiation is only from
the
nodes.
S*

so if there is only a single high voltage point at the top how is it
vertically polarized and how does it radiate at all without the other
half of the dipole?

You probably have seen the CB radio. On the end of the whip is alternate
high voltage. It radiate the longitudinal electric waves. The other half
of
a dipole is chassis (car). Is there any polarisation?
S*



There sure is. It is typical to see 20dB or so loss when you rotate a
dipole receiving from a vertical ground plane CB antenna from vertical to
horizontal.

The transmmiting "cold catode" is thin and long. It radiate the alternate
electric field perpendicular to its length. Receiving antenna also have the
best direction to collect electrons.

From a car it may not be truly vertical because of the body, but it is
still easy to detect.

Polarisation is linear, circular, eleptical. Could you produce it by
rotation of monopole?
S*