On 20 Oct, 04:59, "Mike Kaliski" wrote:
"John Doe" wrote in message

...I am looking for the construction article "FRACTAL Antenna for 10m" that
appeared sometime ago in I think either QST, Ham Radio, or 73 magazines.

I have a lot of spare time on my hands - so I thought I would like to
construct one and use it portable as I live in a Antenna Restricted
Community.

73's

As others have mentioned, several articles appeared in various magazines
snip.
Obviously you will need two mirror image windings to create a dipole
antenna,

Mike,
the definition I arrived at is that as long as the wire represents one
wave length,
is resonant and in equilibrium while at the same time holding to the L/
C ratio of the material in question.
This can be produced with just two degrees of freedom by folding
the wire at the half wave point
and then wind the two wires in pancake shape/form.
You can also wind two in series where capacitive actions
between them can create a variety of results.
The important point is that one must hold to the
conditions set in the definition
(no exceptions)

Art





ideally as closely matched in dimensions as possible. Efficiencies
can approach 50% of a full sized radiating element.

Hope this helps

Mike G0ULI

"art" wrote in message
oups.com...
On 20 Oct, 04:59, "Mike Kaliski" wrote:
"John Doe" wrote in message

...I am looking for
the construction article "FRACTAL Antenna for 10m" that
appeared sometime ago in I think either QST, Ham Radio, or 73 magazines.

I have a lot of spare time on my hands - so I thought I would like to
construct one and use it portable as I live in a Antenna Restricted
Community.

73's

As others have mentioned, several articles appeared in various magazines
snip.
Obviously you will need two mirror image windings to create a dipole
antenna,

Mike,
the definition I arrived at is that as long as the wire represents one
wave length, is resonant and in equilibrium while at the same time holding
to the L/C ratio of the material in question. This can be produced with
just two degrees of freedom by folding the wire at the half wave point and
then wind the two wires in pancake shape/form.
You can also wind two in series where capacitive actions between them can
create a variety of results.
The important point is that one must hold to the conditions set in the
definition (no exceptions)

Art

ideally as closely matched in dimensions as possible. Efficiencies
can approach 50% of a full sized radiating element.

Hope this helps

Mike G0ULI


Art

I agree. Incidently the origin of the idea for fractal antennae apparently
arose from the observation that hanging down the ends of a dipole, or
bending it to fit a limited site didn't affect the efficiency too much. A
university student decided to see just how much bending and could take place
before the antenna became unusable and hey presto, the fractal antenna was
invented and he had a thesis for his degree.

Mike G0ULI

On 20 Oct, 09:34, "Mike Kaliski" wrote:
"art" wrote in message

oups.com...



On 20 Oct, 04:59, "Mike Kaliski" wrote:
"John Doe" wrote in message

om...Iam looking for
the construction article "FRACTAL Antenna for 10m" that
appeared sometime ago in I think either QST, Ham Radio, or 73 magazines.

I have a lot of spare time on my hands - so I thought I would like to
construct one and use it portable as I live in a Antenna Restricted
Community.

73's

As others have mentioned, several articles appeared in various magazines
snip.
Obviously you will need two mirror image windings to create a dipole
antenna,

Mike,
the definition I arrived at is that as long as the wire represents one
wave length, is resonant and in equilibrium while at the same time holding
to the L/C ratio of the material in question. This can be produced with
just two degrees of freedom by folding the wire at the half wave point and
then wind the two wires in pancake shape/form.
You can also wind two in series where capacitive actions between them can
create a variety of results.
The important point is that one must hold to the conditions set in the
definition (no exceptions)

Art

ideally as closely matched in dimensions as possible. Efficiencies
can approach 50% of a full sized radiating element.

Hope this helps

Mike G0ULI

Art

I agree. Incidently the origin of the idea for fractal antennae apparently
arose from the observation that hanging down the ends of a dipole, or
bending it to fit a limited site didn't affect the efficiency too much. A
university student decided to see just how much bending and could take place
before the antenna became unusable and hey presto, the fractal antenna was
invented and he had a thesis for his degree.

Mike G0ULI- Hide quoted text -

- Show quoted text -

Yup He is way ahead of the average ham but he did have an engineering
background
now he is making a lot of money with a product that the average hame
decries.
I was looking at Tom's page W8ti and I was very suprised to see that
he states
an antenna must be straight no less plus a lot more in accurate
statements.
He has written articles as have many on this newsgroup but as I have
stated before
believe what you want but often it is not correct.
On this newsgroup I am often reminded of the scene around madame
guillotine with
the . hoards of baying crowds of the ignorant looking for blood.
Have to make a correction on past statements tho, instead of one
wavelength radiator it should read
" one wavelength or longer" because of the genorous number of
harmonics.
Cheers
Art KB9MZ....XG (uk)

On Oct 20, 11:34 am, "Mike Kaliski" wrote:


I agree. Incidently the origin of the idea for fractal antennae apparently
arose from the observation that hanging down the ends of a dipole, or
bending it to fit a limited site didn't affect the efficiency too much. A
university student decided to see just how much bending and could take place
before the antenna became unusable and hey presto, the fractal antenna was
invented and he had a thesis for his degree.

Mike G0ULI

Just linear loading with a fancy name..
Or the way I see it anyway..
The thing is... Most consider linear loading as
inferior to high Q coil loading, as long as the
coils are placed at the proper locations to
maximize current distribution.
But I can see their use in small items like
cell phones, etc..
I doubt if I would use one as a ham radio antenna
though.
Heck, my 160m "Z" dipole could be considered a
fractal. Even a dipole qualifies. All symmetrical
antennas can be called "fractals" if you wanted to
be strict about it.
MK

wrote:
Heck, my 160m "Z" dipole could be considered a
fractal. Even a dipole qualifies.

Yep, fractal stands for "fractional dimensions". A
dipole is primarily in one dimension. A "ground
plane" is primarily in two dimensions. Anything
that does not occupy all three dimensions equally
qualifies as a fractal.
--
73, Cecil http://www.w5dxp.com

On 20 Oct, 11:42, wrote:
On Oct 20, 11:34 am, "Mike Kaliski" wrote:



I agree. Incidently the origin of the idea for fractal antennae apparently
arose from the observation that hanging down the ends of a dipole, or
bending it to fit a limited site didn't affect the efficiency too much. A
university student decided to see just how much bending and could take place
before the antenna became unusable and hey presto, the fractal antenna was
invented and he had a thesis for his degree.

Mike G0ULI

Just linear loading with a fancy name..
Or the way I see it anyway..
The thing is... Most consider linear loading as
inferior to high Q coil loading,

A coil is linear loading as well
so a coil is just a fancy name?

"Most consider" agaim it looks like science is judged like the polls!



as long as the
coils are placed at the proper locations to
maximize current distribution.
But I can see their use in small items like
cell phones, etc..
I doubt if I would use one as a ham radio antenna
though.
Heck, my 160m "Z" dipole could be considered a
fractal. Even a dipole qualifies. All symmetrical
antennas can be called "fractals" if you wanted to
be strict about it.
MK