On Jun 29, 8:41*pm, lu6etj wrote:
I learnt displacement current inside a condenser it was = eo* d(phi E)/
dt no EM radiation inside the condenser to made that current possible,
in any case EM radiation in physical condenser will come out from
condenser to the rest of the universe :).

It depends on your definition of "radiation". In an ideal transmission
line, energy is not lost to radiation but photons (EM fields and
waves) necessarily exist all up and down the line. In an ideal coaxial
transmission line, the photons (EM fields and waves) are confined to
the dielectric. Electrons cannot travel at the speed of light. EM
waves travel at the speed of light. Therefore EM waves are photons.
Given the physical nature of a capacitor, refraction would be the
primary mechanism for losing energy to radiation and there's probably
very, very little refraction in the capacitor dielectric. If electrons
are being acelerated and decelerated in the capacitor, photons will be
emitted. It seems obvious now that when electrons are decelerated on
one capacitor plate, photons are emitted that propogate across the
capacitor dielectric and are absorbed by electrons on the opposite
plate. When the concept of displacement current was invented, nobody
knew that RF fields were actually made up of particles (photons) but
now we do know. Displacement current seems only to be EM radiation
from one capacitor plate to the other.

As it was taught to me (I am not physicist), quantum nature of a 80 m
wavelenght energy it is useless for calculations and invisible to our
instrument resolution because its immensely large quantic number. Is
it wrong?

The quantized nature of a single RF photon is no longer open to
argument and the energy in that single photon can be calculated,
(h*f), where h is Planck's constant, 6.626 x 10^-34 J*s. Whether there
are any instruments sensitive enough to detect a single 80m photon is
a moot point that does not change the nature of RF fields and waves.
What is important is that it is impossible to radiate a signal level
less than (h*f). If anyone asserts that RF fields and waves can
violate the laws of physics regarding photons, that person is wrong
and delusional. (Light left over from the time when the universe
became transparent is today red-shifted down to RF microwave
frequencies and called background radiation.)
--
73, Cecil, w5dxp.com