Welcome to EH-antenna.fromru.com. As you can easily see, this site is
fully devoted to so-called EH antennas, and it has Russian origin. That's
true. Since most web sites related to the EH antenna look very similar,
this one is intended to be significantly different from them. Our primary
goal is to analyse this funny creation using mostly modern science and
eventually to answer the question: "Is it actually a new method of electromagnetic
wave radiation or just a weak theory coupled with erroneously interpreted
measurements?" We will look at some historical aspects of the EH antenna
and a CFA (crossed field antenna - its predecessor), review their theory,
observe practical results reported by people who have built this antenna,
and we will try to explain all the above.
So, this is our view of the EH antenna. From Russia.
From time to time someone tells us about a revolution in the
antenna world. A common way to express results of their experiments is
like "2% of wavelength size while 94% efficiency comparing to a full size
dipole". Sometimes it is claimed that experimental results can't be explained
theoretically, but usually inability of an experimenter to explain the
results of his or her experiment doesn't mean the theory is weak or obsolete.
This is exactly the case with the EH antenna. Its authors claim that it
can't be explained by modern theory, and it can't be modelled by modern
antenna modelling software. However we will try to do them both.
First, if a small antenna radiates like a big one, it's always a good
point to look for something not counted. Usually this something is just
a radiating feeder. For instance, DL7PE microvert uses a part of its feeder
as a counterpoise, but its author claims about very low electric field
around the counterpoise. However MMANA simulations show a different picture:
a part of radiation coming from the counterpoise is much higher, than from
the microvert itself.
Understanding feeder radiation is easy if one splits all the currents
and voltages into two groups: common mode and differential. A short explanation
is there: Common mode and differential
signals in a coax line. The very next step is getting familiar with
conversion of differential signals to common mode signals: Where
Common Mode comes from. Then analysis of any particular feeder layout
becomes an easy task: Various
cable layouts. With all this theory in hands we can look at a real
example, say DL7PE microvert, and also at some variants of its counterpoise
arrangement: DL7PE analyzed.
Finally, look at the EH antenna: EH
at close look . And now it is time to take some real measurements on
the EH antenna: L+T EH measurements
. Using this measuring technique we can build an equivalent circuit of
the EH antenna when it is fed by an L+L phasing/matching network and analyse
its SPICE model: L+L EH measurements .
To be continued...
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