Roomcap**
-THEORY**

**21th June 2014****
****f ** (upd **21st Jan **2016)

Felix Meyer HB9ABX

Felix Meyer HB9ABX

Theory of Roomcap

ATTENTION:

The skim this page without to see the links and to calculate,

this brings you nothing!

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>>>NEW:29th July 2014

Theory of classic antenna here and hereI recomend to read the introduction to the new antenna, to understand the

the idea behind, who was let me to the new construction.

The text in the theory contains little text, and the formulas and the pictures

are better if youread the introduction before this theory!

Here to the INTRODUCTION

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First : Antennas and Physics

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Here are the physical fundamentals, where we exply

in what is thedifferenceto the

classic wire antenna. See first Link above.

The principle in a classic antenna is : Current in wire

The principle in Roomcap antenna : Current over planes

The current flowing in a current creatings a magnetic field, and this field is

called H-field. I = current, r = distance from wire. And: here

Units of H-field = A/m

H = I / (2 . phi . r)

The voltage produces an E-field around the wire. As higher the voltage,

as higher is the E-field. Units of E-field = V/m

Principle: Current in wire

Look a half wave dipole, we see the voltage and current strenght.

Picture:Half wave dipole

green= voltage, red = current

We see the following:

- At both ends of dipole = maximum voltage, there the current is zero.

- At the center = maximum current, and the voltage has minimum.

Correspondingly, we have a strong H-field in the center of the dipol,

and we have at both ends H-field zero. At boths ends we have strong

E-fields, and in the center we have a minimum E-field.

This field at the antenna is called "near-field".

This near-field radiates NOTHING, as no power is radiating, because the

product of E-field x H-field = (nearly) NONE.

The both fields at the dipole are dephased by 90 degrees.

The two fields are now form a reactive near-field in this the power is stored.

Then, in the "transition zone" in which within a few longwaves the "far field"

emerges.

In the "far field" the E-field and H-field are in phase to each other.

(A short radiator is shorter than 7% of the wave length) seeYou can more information about near field and far field: here and hereshould be

To radiate REAL POWER, the product of

only REAL, therefore the cos(phi) should be at most 1.

cos of 90 degr = 0, cos von 0 degr = 1 (table with cos values here)

Therefore, my thought was to elimate the phase displacement between E-field

and H-field.

When you take a short radiator, then the cos (phi) >0.95,

however how one can increase the efficiency of the short radiator ?

PICTURE

With a long radiator there on "voltage maximum" with E field andNote:

at "current maximum" with H field, whereby these both fields are shift by 90

degrees, and therefore form a "near field" that does not radiate.

Only then at distance a radiating filed emerges, where the E field and H field

are in phase, and then we have a "far field", where we have action at a distance.

Thanks to the short radiator, where we have a "far field" in the Roomcap! .

NEW >>>>>>See theseremarks

Then to the MAXWELL's equations:

These equations describe the relation between the electric an magnetic

properties. See here

Now, the understanding is different, and nearly nobody is capable to

understand this fully. These equations are in differential or integral

form, and one learn only how the mathematical rules are used.

Who understandes what these equalitions mean ?

Here I will try to explain my thoughts:

Picture:MAXWELL

You see in it the current I, which produces the H-field, and you see,

between the two plates a field H, without having a conducter there.

In the capacitor is the E-field between the plates.

The AC voltage is connected to the capacitor, and therefore a AC current flows

in the wires to the capacitor. Now a current flows inside the capacitor, which

generates a H-field between the plates.

This current is called displacement current.

Note:

The current I in the wires and the current in the capacitor arein phase,

because wires and capacitor are in serie.

The voltage U is dephased by 90 degrees to current I in the capacitor.

The E-field can not escape, because the plates are shielding the own field!

With the circuit above can not radiate real power, because cos(phi) ist here 0.

In order to obtain real power, real resistors have to added, either in serie to

the conductor, or in parallel to the capacitance.

A classic antenna added a radiation resistance, in order to radiate real power.

The real power is: U x I x cos(phi).

The antenna theory states:

P= I x I x Rs (Rs = serial radiating resistor), there the Rs should be as high

as possible.

And the current ???

NEW >>>>>>>>> Read the remarks- What happens, if we

In the picture MAXWELL should be the capacitance as possible high, because

greater C, the greater is the I.

Therefore, many tried to build a small C-antenna (EH-Antenne, CFA, Isotron,

HB9AKN), and more others.

Success: Theyfailed, because their efficiency is so low, and hence unusable.

Why ?: The E-field is between the cap plates, therefore the E-field is shielded.

Here a new idea:

opena capacitor?

Now, we will find out something very interesting, as we see below:

Therefore introduction of :OPEN CAPACITOR:

Picture:"open capacitor" (on the right)

This always described as capacitor, where two plates are parallel position to each other.Withopen capacitorthe E-field canradiatein the room.

Hence, the E-field is shielded from the environment by the plates, and the E-fields can

not leak the capacitor. However, you orient the plates such, that shows above, the E-field

and the displacement current can flow in to the room (environment), and hence

emerges new properties.

(A closed capacitor has (ideally) a infinite high parallel resistance).

Observation:A (parallel) radiation resistance appears in the "open capacitor"

(in the free room), and this receives the transmitter power and radiates the

power as wave in the room.

This is now theprinciple of the ROOMCAP antenna.

The "open capacitor" comprised of plane below (counter plane) and of theOut from this planes flows the current into the environment.

vertical plane. The two planes should see each other as few as possible.

The direct capacitance is nearly zero, the capacitance to the room is great.

Here I say, when the current flows over the planes:

"CURRENT OVER PLANES"

The electromagnetic wave flies in form as photons into the space. Awire antenna

generates virtual photons in the near-field, and then in the transition zone (here) the

photons emerge to radiate then from the far-field in the space. A possible explanation

is, why the high efficience of this antenna, the virtual photons have not to be

converted to photons.

Note:The dimension of plane here (radiator), where the length is shorter than 7 % of

the wave length. When one spreak about aperture antenna (horn, parabolic), then

the dimension the antenna is 0.5 length to many times the length the wave length.

This is a complete different thing!

(In picture "Maxwell"

Observation:

The formulars for antennas origin from Maxwell equations, whereby in

always the basis was "current in wire".

When I apply the Maxwell Equations for "current over planes", then

new formulars result!

exchange the capacitor by "open capacitor")

AND: This a very interisting observation: Roomcap has only far-field !!!

The far-field begins at the Roomcap antenna!(The measurement has showed, that the intensity of E und H reduces with 1/r,

The Roomcap antenna has no near-field!

his the property of the far-field!See here and here

-To understand this better, see theimportant>>> remarks

>>> Important points:

- separate the "open capacitor" from the coax by a current choke,(nearly)

- use alossless impedance transformer before the "open capacitor",

- isolate of the counter plane from the "ground".

RESULT:The

efficiencyof the Roomcap was measured to be 87% on 40 m!The

analysewith measuring and calculating ishereavailabe.

The signal measured by more than 25 automatic station in Europe,

in distance range between 140 km to 2500 km.

The comparison with stations using wire antennas during long time.

- antenna in normal heigthbetween 6 to 20m above ground

- my position within distance of 200m from comparison station

- both stations use the same power

- in CW

- at the same time

- automatic transmission

- 1 hours long automatic measuring, Roomcap in auto on the street

(with RBN evaluting and analysing).

The RBN evaluating with text and pictures is here(with QSB compensated )

>>> Thefield strenghdocumented4 to 10dB stronger than the comparison stations!

Info about RBN system here .

There is no better prove of the function of a antenne than

the reports, which are measured by the remote stations !

Please let me know your opinion about this theory. I wanted to exclude mathematicA request:

discussion, but we go more into details, math becomes very important.

Read the "comments" to get more details info.

- Tell me know typing errors.

Thanks for your email here.

(Note: The construction guide is available, that construction is corrent, see here )

To better understand the eletromagnetic wave generation:

Now follows a result from Gerd Janzen,

where he tried with a test with a short antenna.

He investigated, if a short antenna with "super large top capacity"

can compete with a good dipole.

His conclusion:

A such antenna is7.89dB or9 dB weakerthan a normal dipole.

On below I will explain, whyhisbest version was not successful.

The ROOMCAP in real measuring with RBN versus den G5RV,

FD-3, Titanex VerticalGP 40/10 ,CP-6, etc. was ever stronger

than the comparing antennas.

The full report from Gerd Janzer is here (only in German)

Below see pictures from the Gerd Janzen simulation, added my comments:

This the definition of the "super top capacity" antenna with 2m diameter, 1m long vertical

radiator, and 6 radials, each one 2m long. Using EZNEC program.

Radition diagram: Antenne above ground = 0.05 m, Frequency = 14 Mc

"Top capacity antenna" = -4.30 dbi at 30 deg

"Super-C-Antenna" = -5.44 dbi at 30 deg

See the results of the invigation obtained Gerd Janzen obtained with his best short version.