On Feb 26, 12:21*pm, "Szczepan Bialek" wrote:
So we also can say that aether
consists of ordinary particles.

It depends upon how one defines "ordinary". The structure of free
space has existed since the big bang but man has only recently
discovered the structure and is still somewhat ignorant of its
configuration and characteristics. There is some evidence that the
structure of space in which ordinary non-dark matter and non-dark
energy exists, is made up of dark matter and dark energy.

I do not understand.

A loop, like a dipole, is a standing wave antenna with a
characteristic impedance in the few hundred ohms, e.g. 600 ohms. The
reflections on a standing wave antenna have to originate from an
impedance discontinuity. The feedpoint impedance of a standing wave
antenna is Zfp = (Vfor + Vref)/(Ifor + Iref) where phasor math is
used. Let's assume that the feedpoint impedance is 100+j0 ohms and the
antenna is being fed with Z0=100 ohm feedline. There are no
reflections on the feedline which means a Z0-match to 100 ohms exists
at the antenna feedpoint. Assume the characteristic impedance of the
antenna wire over ground is 600 ohms. The 600 ohm to 100 ohm impedance
discontinuity at the feedpoint creates a reflection coefficient of
0.7. That's where the reflections on the standing wave loop antenna
are coming from. One reason the feedpoint of a resonant loop is higher
than for a 1/2WL dipole is that the reflection coefficient for the
loop is 0.7 while the reflection coefficient for a dipole is obviously
1.0 at the ends of the dipole.

The concept may be easier to understand using a rhombic example. A
terminated rhombic is terminated in the characteristic impedance of
the antenna wire above ground, e.g. 600 ohms, which eliminates
reflections on the antenna and turns it into a traveling wave antenna
where the feedpoint impedance of the antenna is equal to the
characteristic impedance of the antenna over a wide frequency range,
i.e. Zfp = Vfor/Ifor, independent of frequency.

Removing the termination turns the rhombic antenna into a standing
wave antenna and the feedpoint impedance becomes Zfp = (Vfor + Vref)/
(Ifor + Iref), i.e. the feedpoint impedance is frequency dependent
like other standing wave antennas.
--
73, Cecil, w5dxp.com