On Mar 13, 10:57*am, Art Unwin wrote:
On Mar 13, 6:23*am, Richard Fry wrote:



On Mar 12, 8:08*pm, Art Unwin wrote:

... Planar designs are usually
designed upon a single polarity and not so much as supplying
sensitivity to other polarities, where as designs based upon optimiser
versions are made sensitive to all types of polarity such that useable
*incoming signals for communication climbs up several 100 percent.

Art (N.B. please) ...

The POLARITY of an electromagnetic wave is determined by its electric
field vector, which reverses direction (polarity) every 180 degrees of
the waveform -- regardless of the polarization of the wave.

The POLARIZATION of an electromagnetic wave is defined by the physical
orientation of its electric field vector, regardless of the polarity
of that field. For linear radiators such as a dipole and monopole, the
direction of polarization is that of the physical orientation of the
radiator.

So although these terms rather sound the same, they aren't synonymous.

The applet linked below is useful to visualize this. To see vertical
polarization, first set the Ey field to zero, and start the animation
(top center of the page). Then set the Ex field to zero and the Ey
field to one to see horizontal polarization. *The blue lines tending
to fill in the a-c waveform represent the field vectors of the
radiated wave.

In this applet if the Ex and Ey fields are set to equal values (say at
1 each), and their phase relationship to -90 degrees using the slider
below the Ex and Ey sliders in the Input Section of the applet, then
the resulting e-m field is perfect, right-hand circular polarization.
The animation shows a net field vector of constant magnitude rotating
through all polarization angles once per wavelength.

Also note that the perfect, c-pol field shown in the applet is the net
field of two, linearly-polarized radiators when configured as
described above.

http://www.amanogawa.com/archive/Pol...zation2-2.html

RF

Thank you for the heads up

Front to REAR would appear to be equal
or better than a dish!
Makes for a very quiet receiving antenna as well as being very good
for transmitting
basing gain on aperture. Very easy to reverse direction using a spst
relay.

On Mar 14, 10:17*pm, Art Unwin wrote:
On Mar 13, 10:57*am, Art Unwin wrote:



On Mar 13, 6:23*am, Richard Fry wrote:

On Mar 12, 8:08*pm, Art Unwin wrote:

... Planar designs are usually
designed upon a single polarity and not so much as supplying
sensitivity to other polarities, where as designs based upon optimiser
versions are made sensitive to all types of polarity such that useable
*incoming signals for communication climbs up several 100 percent.

Art (N.B. please) ...

The POLARITY of an electromagnetic wave is determined by its electric
field vector, which reverses direction (polarity) every 180 degrees of
the waveform -- regardless of the polarization of the wave.

The POLARIZATION of an electromagnetic wave is defined by the physical
orientation of its electric field vector, regardless of the polarity
of that field. For linear radiators such as a dipole and monopole, the
direction of polarization is that of the physical orientation of the
radiator.

So although these terms rather sound the same, they aren't synonymous..

The applet linked below is useful to visualize this. To see vertical
polarization, first set the Ey field to zero, and start the animation
(top center of the page). Then set the Ex field to zero and the Ey
field to one to see horizontal polarization. *The blue lines tending
to fill in the a-c waveform represent the field vectors of the
radiated wave.

In this applet if the Ex and Ey fields are set to equal values (say at
1 each), and their phase relationship to -90 degrees using the slider
below the Ex and Ey sliders in the Input Section of the applet, then
the resulting e-m field is perfect, right-hand circular polarization.
The animation shows a net field vector of constant magnitude rotating
through all polarization angles once per wavelength.

Also note that the perfect, c-pol field shown in the applet is the net
field of two, linearly-polarized radiators when configured as
described above.

http://www.amanogawa.com/archive/Pol...zation2-2.html

RF

Thank you for the heads up

Front to REAR would appear to be equal
or better than a dish!
Makes for a very quiet receiving antenna as well as being very good
for transmitting
basing gain on aperture. Very easy to reverse direction using a spst
relay.

Had an E mail asking questions about the antenna not wanting to post
on the group!
My meshg curtain moves away from the other antennas that I have made
with window mesh which are designed for tower top with a rotor. The
curtain I have made is much bigger than required but with commercial
statiions using curtain style antennas I thought I would make one out
of interest. I used all the mesh I had accumulated which amounted to a
100 yards by eight feet stapled together and hung it up just like the
washing line of the old days so it wasn't touching the ground. Both
sided are grounded and you must view the array as two separate sides
where with the use of a spst relay you connect to both sides with the
coax and switch out the side that you are using as a reflector or vica
versa. The ground I used was just a stake in the ground. The swr span
is dependent on the size of the curtain and I wouldn't be surprized if
the amount of wire in the mesh has something to do with it. The Swr on
my curtain is less than 2:1 up from the top band on all frequencies.
I have a AM station in sight close by which normally is some 20 plus
over nine. My reflector put it to some where below 5 S units a very
rough observation.
Books usually refer to the use of chicken wire but my mesh is 20 by 18
per inch and aluminum! i am assuming that current views it as a
surface or flat plate so the current disperses. The wire is coiated
with a type of nickel or conductive coating so I dont remove the
coating any more. The aluminum wire is woven so I roll it flat so that
good contact is made.
You can connect the coax any where but make sure you are not
penetrating to the other side. You can actually put the coax centre
wire just an inch or so from the ground connection and no it will not
short across. All ground connections must be to the same point. The
wire mesh is a two sided antenna where the edges of the curtain being
quite sharp provides a barrier to prevent cross over. The antenna is
really just a Faraday shield where incomming signals hit on the side
which is facing the signal. Now first the static is removed and
channelled to the ground. The actual signal hits the side like a
sticky particle and separates into two fields electric and magnetic.
One field stays stuck to the outside and the other side gathers the
other field ( I won't go into how the other sticky particle gets to
the other side but it comes from the Laws of Newton).
The inside particle then wants to slide over so it is opposite the
position of the other partical
or field. We know that radiation is created by an accelleration of
charge so going backwards in thought the insiden moving particle or
charge created provided a time varing current wbhich the radio can
handle. Getting back to the two particles or field these are now equal
and opposite and thus will cancel. Thinking a bit more about it, the
current produced a electric field which turned into a magnetic field
and then back into a electric field just like it would with a parallel
tank circuit so when the fields cancelled you only have left the
applied current!
Remember now that we have always looked at radiators as wires but in
this case we are viewing our radiators as a solid plate though we do
have very small holes in the surface where the impinginging particle
cannot get through beyond what we call skin depth.
Remember also that the charge carrying particle ( not a wave) also has
a spin to it like a bullet so it can maintain a straight line together
with a cancellation of gravity, so the particle must be viewed as the
smallest mass possible BUT WITH A ROTATION OR SPIN that has a radius
in excess of the holes size. So really the radiator doesn't totally
block a signal like a mirror but it does absorb the signal depending
on its thichnes ie one skin dept penetration equals three db
attenuation etc.
Explanation is a bit long but for those who are not willing to get
involved but are still interested I am hoping that this will help.
Bottom line is that if you add a time varying field to a Gaussian
static boundary you then have the same formula as Maxwell. Thus waves
are not there only static particles upon which you placed a charge.
I.e. communication or radiation is not created by a "wave" but by
something more tangiable which is a "particle" of mass carrying a
charge moving at the speed of light and with rotation like a bullet so
that it maintaines a straight path. The path is created by the applied
current which lifts the particle like a frog experiment you dis in
high school and then propelled away by the intersecting field and
displacement current just like an electric train.
Cheers and Beers
Art Unwin.....KB9MZ......XG

On Mar 15, 8:35*am, Art Unwin wrote:
On Mar 14, 10:17*pm, Art Unwin wrote:



On Mar 13, 10:57*am, Art Unwin wrote:

On Mar 13, 6:23*am, Richard Fry wrote:

On Mar 12, 8:08*pm, Art Unwin wrote:

... Planar designs are usually
designed upon a single polarity and not so much as supplying
sensitivity to other polarities, where as designs based upon optimiser
versions are made sensitive to all types of polarity such that useable
*incoming signals for communication climbs up several 100 percent.