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Errante's CAPACITIVE EARTH GROUNDING SYSTEM

See also: Virtual ground node generator for unbalanced lines

 

VIRTUAL GROUND NODE GENERATOR
for
BALANCED TRANSMISSION LINES

in-line "B.V.G.N. G.", for short


Errante's virtual ground node generator for balanced lines - Errante's BVGNG

Virtual ground node generator for balanced transmission lines .

Freq. range: da 1 a 30 MHz
Input impedance: 300 Ohm
Output impedance: 300 Ohm
Input/output S.W.R.:   1:1 within freq. range
Insertion loss: -0.01 dB
RF Power: 3 KW cw
Connectors type: M6 studs
Weight : 1 Kg ca.

Virtual ground node generator for balanced transmission lines being tested for frequency response flatness within its specified frequency spectrum

Picture of the virtual ground node generator for balanced transmission lines being tested for frequency response flatness.

 

The virtual ground node generator for balanced transmission lines : what it is and how it works.

The virtual ground node generator for balanced transmission lines.

by Francesco Errante

The reader who's not already familiar with the virtual ground node mechanism is strongly adviced to read about the virtual ground monopole HF antenna and its background, prior to proceeding with the reading of this page.

The virtual ground node generator for balanced transmission lines and balanced antenna systems (B.V.G.N.G. for short) is a radioelectric circuit based on the same principals governing the virtual ground node generator for unbalanced lines and it is built around a broadband high power flux-coupled RF transformer having a 300 Ohm center-tapped balanced primary winding and a 300 Ohm center-tapped balanced secondary winding (Bal-Bal 1:1). The two central-tappings, each of them seat of a virtual ground node, are bonded together and connected to the chassis, ensuring a complete galvanic continuity amongst all the branches of this device.

This device allows to de-coupling the half-a-wave folded dipole (300 Ohm impedance) from its balanced transmission line (300 Ohm impedance) by imposing a clear-cut electric boundary for the RF signals flowing between the transmission line and the folded dipole antenna, in order for the dipole to exhibit its true bandwidth and for the transmission line not to interfere with it.
In the absence of a clear-cut boundary between the transmission line and the radiator, infact, the transmission line acts as part of the radiating circuit, inevitably, modifying its electrical length and giving it-self origin to hertzian radiation, with unpleasant consequences such as: loss of signal, radio interferences induction on the surrounding equipment and, above all, the illusion of a phenomenon of resonance of the transmission line it-self. Balanced lines are, instead, aperiodic as demonstrated here.

A properly adapted 300 Ohm balanced transmission line terminated on a 1/2 wavelenght folded dipole, through a balanced virtual ground node generator, undergoing a low power radioscopic detection. Experimental verification of the IInd Errante's law applied to the transmission line

A folded dipole and its transmission line, de-coupled through a BVGNG - Radioscopic detection of the RF electric field generated by the radiator and absence of radiation by the balanced transmission line.

A properly adapted 300 Ohm balanced transmission line terminated on a 1/2 wavelenght folded dipole, through a balanced virtual ground node generator, undergoing an high power radioscopic detection. Experimental verification of the IInd Errante's law applied to the transmission line

A properly adapted 300 Ohm balanced transmission line terminated on a 1/2 wavelenght folded dipole, through a balanced virtual ground node generator, undergoing an high power (1 kW CW) radioscopic detection. Experimental verification of the IInd Errante's law applied to the transmission line

A properly adapted 300 Ohm balanced transmission line terminated on a 1/2 wavelenght folded dipole, through a balanced virtual ground node generator, undergoing an high power radioscopic detection. Experimental verification of the IInd Errante's law applied to the transmission line

A properly adapted 300 Ohm balanced transmission line terminated on a 1/2 wavelenght folded dipole, through a balanced virtual ground node generator, undergoing an high power (1 kW CW) radioscopic detection. Experimental verification of the IInd Errante's law applied to the transmission line

This device can be built to suit any impedance transformation ratio. For example: to properly feed an half a wavelength open dipole with a 300 Ohm bifilar transmission line, it is necessary a Bal-Bal having an imput impedance of 300 Ohm ed an output impedance of 70 Ohm.

Moreover, the B.V.G.N.G. can be employed to generate a virtual ground node anywhere along a balanced transmission line.

Scientific relevance:

The B.V.G.N.G. demonstrates that a balanced transmission line, when correctly de-coupled from the radiator, always exhibits an aperiodic behaviour, even if it is terminated on matched reactive loads.
See: the behaviour of balanced transmission lines for radiofrequency electric signals in a progressive wave regime

Operational advantages:

a) Ensured aperiodicity of the employed balanced transmission line;

b) inhibition of hertzian radiation onset from the balanced transmission line;

c) full rejection of the co-phased currents induced onto a balanced transmission lines by any external RF source;

d) diminuisced signal losses.

 

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Price:
Euro 300,00 +V.A.T. and shipping costs.
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All the concepts, methods, designs and devices presented on this web site
are the original novelty works of FRANCESCO ERRANTE.
Patents & Copyright © 2003- of FRANCESCO ERRANTE.

Material is governed by the Copyright, Designs and Patent Act.
No reproduction, in whole or in part, without written permission.
Copies of these documents made by electronic or mechanical means, including information storage and retrieval systems, may only be employed for personal use.
All rights reserved.


All rights reserved. Copyright © 2003- Francesco Errante
www.Radiondistics.com - Tel.(+39) 339.180.1313