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ERRANTE's
ANTENNA : what it is, how it works and how it came to be
made.
VIRTUAL GROUND ¼ of wavelength
MONOPOLE (HF) ANTENNA
by Francesco Errante
The Author, by means of a particular radio-electric circuitry for the suppression of anyone of
the two branches of a ½ of wavelength open dipole, has previously demonstrated
that, indeed, it is possible to receive and above all, transmit large
radio-electric signals across the space by employing a single
radiating/captating element of a physical length equal to ¼ of wavelength,
without the necessity of the presence of its symmetric (see Hertzian
Dipole ) or the necessity of a natural ground plane (see Marconi's
Antenna ) or an artificial one made of radials or counterpoises as in the
Ground Plane Antenna. The need to have the Earth or another artificial
ground as an electric reference point to correctly polarize a single resonant
radiator/captator of a physical length equal to ¼ of a wavelength, has been
eliminated by generating a virtual ground node, the existence of which
is function of the precise balancing of the of a broad-band RF transformer.
("virtual ground" is defined as a point in an electrical circuit that appears
to be at ground, but is not actually attached to ground, it is therefore, a
node having a 0 degree phase angle difference with respect to ground and has
the same electrical potential as the Earth")
This method, however, implied a 50% dissipation of the system energy.
The invention described hereby, while exploiting the physical principal
of the virtual ground node, eliminates the need for sacrificing any of
the system energy.
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The solution to that problem is given
by the possibility of generating the virtual ground node by
recombining two radio-electric signals, identical but 180 degree out of phase
between them-selves. This can be achieved by employing a broad-band
flux-coupled balun transformer(9) built around a binocular type ferrite core,
having a center-tapped balanced primary winding(11) for the obtainment of the
said virtual ground node to be used as a zero-potential reference
point for the whole of the circuit and having also a secondary winding(13)
exhibiting an impedance value of 150 Ohm for the direct coupling to a ¼ of a
wavelength radiator/captator(1).
The transformer(9) and the radiator/captator(1) are the essential parts of the
VIRTUAL GROUND ¼ of wavelength MONOPOLE ANTENNA, they alone, infact,
constitute a ¼ of wavelength monopole antenna with balanced input. However, in
order for it to match the current transmission line standards, it has been
necessary to provide it with a second transformer(5) capable of adapting the
unbalanced coaxial antenna output of a conventional transceiver to the balanced
input of this antenna transformer(9).
The RF energy transfer between the two transformers(5 & 9) is accomplished
by the twinned coaxial transmission lines(7)
which can be of any length but must be identical between them-selves so not to
alter the original phase-angle difference between the RF signals they are meant
to be carrying. Although, the value of impedance of the intermedium circuit,
which comprises the primary winding of the transformer(9), the twinned coaxial lines(7) and the secondary winding of
the transformer(5) can be set to any value, it turned out to be convenient
adopting a standard value of 50 Ohm.
Scientific
relevance:
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a. it demonstrates that a single electrically
conductive element of a physical length equal to ¼ of wavelength is all
it takes to accomplish natural resonance and full radiation.
b. thanks to its most elementary shape and bare simplicity of the
radiating element, it allows further investigation into the physics of
the radiowaves. (see here)
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Operational advantages:
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a. the VIRTUAL GROUND MONOPOLE HF ANTENNA
demonstrates that, indeed, it is possible and relatively inexpensive to
implement an highly efficient way to better radiate RF energy while
cutting by 50% the room needed to deploy a full-size HF antenna.
b. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much larger
bandwidth compared to conventional full-size aerials.
c. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much stronger
immunity to parasitic capacitive effects compared to conventional
full-size aerials.
d. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers high resonance
stability regardless of the level and inclination above the ground.
e. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much stronger
immunity to out-of-band emissions compared to conventional full-size
aerials.
f. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much stronger
immunity to electrostatic charges and noises compared to conventional
full-size aerials.
g. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a sharper
radiation pattern than conventional full-size aerials.
h. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much faster
deployment time compared to conventional full-size aerials.
i. the VIRTUAL GROUND MONOPOLE HF ANTENNA offers a much better
E.M.I. compatibility with highly populated environments compared to
conventional full-size aerials.
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Applications:
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a. SHORT WAVES FIXED & MOBILE RADIO STATION FOR
CIVIL & MILITARY PURPOSES
b. STEALTH, FAST & TACTICAL DEPLOYMENT PURPOSES
c. SEARCH & RESCUE SERVICES
d. SHIP to SHIP & SHIP to SHORE MARINE COMMUNICATIONS
e. AIRCRAFT COMMUNICATIONS RANGE EXTENDING ANTENNA
f. DX-ing and metropolitan HAM RADIO STATIONS
g. ELEMENT in ARRAYS of AERIALS
h. RADIO-PHYSICS LABORATORIES
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most F.A.Q.: can I drive 2 or more
monopoles simultaneously, as in a fan dipole configuration, so
that I can cover several HF bands?
ANSWER: Yes ! The present virtual ground RF feeding
system allows you to run all the ¼ of wavelength monopoles needed to give
you a general coverage of the HF spectrum, without the need for
switchings. The monopoles can be arranged on both vertical and horizontal
planes. Space is all you need to deploy them.
Now, also available for the 225 Ohm Errante's multiband HF antenna system
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Price:
Euro 700,00 +V.A.T. and shipping costs.
For an useful currency converter click here
 NB. Price DOES NOT INCLUDE the cost of the
twinned coaxial line, nor the radiators, which, however, can be supplied
on request.
RADIONDISTICS' products carry an unconditional
lifetime guarantee.
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NOW, also available in the
