Maybe this is a naive question, but how does an antenna, fractal or
otherwise, know what kind of transmitter is driving it? Why are
software radios more suited to this design?

vy 73

Andy, M1EBV


True frequency and waveform agility is the goal in SDR . Wideband, or
controlled multiband, is needed. Ham requirements are well met at present with
a variety of antenna designs that are nearly periodic in a fairly narrow
frequency coverage, a fairly easy problem to solve.
73,
Chip N1iR

Translation: fractured antennas are horse****.

"Fractenna" wrote in message
news:20040609122135.15248.00000404@mb-
True frequency and waveform agility is the goal in SDR . Wideband, or
controlled multiband, is needed. Ham requirements are well met at present
with
a variety of antenna designs that are nearly periodic in a fairly narrow
frequency coverage, a fairly easy problem to solve.
73,
Chip N1iR

On Sat, 12 Jun 2004 18:45:30 -0700, "CW"
wrote:
Translation: fractured antennas are horse****.
Unfortunately, that association is an aspersion upon horse****. ;-)

LOL!

"Richard Clark" wrote in message
...
On Sat, 12 Jun 2004 18:45:30 -0700, "CW"
wrote:
Translation: fractured antennas are horse****.
Unfortunately, that association is an aspersion upon horse****. ;-)

In message , Richard Clark
writes
On Sat, 12 Jun 2004 18:45:30 -0700, "CW"
wrote:
Translation: fractured antennas are horse****.
Unfortunately, that association is an aspersion upon horse****. ;-)

Not a good analogy. Horse**** can be quite useful (ask any organic
gardener).
Ian.
--

Ian Jackson wrote:

In message , Richard Clark
writes

On Sat, 12 Jun 2004 18:45:30 -0700, "CW"
wrote:

Translation: fractured antennas are horse****.

Unfortunately, that association is an aspersion upon horse****. ;-)


Not a good analogy. Horse**** can be quite useful (ask any organic
gardener).
Ian.

Equine Excrement is a tad difficult for some gardening. IT has lots of
plant material that needs a good bit of time to compost correctly.
Mushroom growers love it, tho'.

- Mike KB3EIA -

Ian wrote,

In message , Richard Clark
writes
On Sat, 12 Jun 2004 18:45:30 -0700, "CW"
wrote:
Translation: fractured antennas are horse****.
Unfortunately, that association is an aspersion upon horse****. ;-)

Not a good analogy. Horse**** can be quite useful (ask any organic
gardener).
Ian.
--

Right. It's absolutely indispensable to cowboys and politicians.
73,
Tom Donaly, KA6RUH

A consortium to investigate fractal electrodynamics theory (FET) has a
webpage at this URL.

http://www.tsc.upc.es/fractalcoms/

From the site:

"There is [a] potential limitation of fractal microwave devices that
must be investigated: the loss efficiency. It has been shown that in
fractal geometries electromagnetic fields and currents concentrate
into very small regions. Since the power loss due to Joule effect is
proportional to the square of the electric current density integrated
along the device surface, current concentration in small areas produce
much larger power losses than more uniform current distributions. This
effect may result in antennas having much lower gain... "

The articles and links are very interesting.

A consortium to investigate fractal electrodynamics theory (FET) has a
webpage at this URL.

http://www.tsc.upc.es/fractalcoms/

From the site:

"There is [a] potential limitation of fractal microwave devices that
must be investigated: the loss efficiency. It has been shown that in
fractal geometries electromagnetic fields and currents concentrate
into very small regions. Since the power loss due to Joule effect is
proportional to the square of the electric current density integrated
along the device surface, current concentration in small areas produce
much larger power losses than more uniform current distributions. This
effect may result in antennas having much lower gain... "

The articles and links are very interesting.