Here's recent video demonstrating a "fractal sleeve":
<http://www.engadget.com/2010/11/24/scientists-finally-find-a-practical-use-
for-metamaterials-boost/>
73,
Dave, AA6YQ
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of Roger (K8RI)
Sent: Thursday, December 16, 2010 1:16 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fractal Antennas, Chip Cohen (N1IR) on Nova
Last Night
On 12/15/2010 9:01 PM, Dennis OConnor wrote:
> Well, Chip created controversy on here (and elsewhere)... He seems to
have made a market for his cell phone and other UHF antenna products - and
more power to him... This is 'supposed' to be a capitalistic economy where
you take risks and get to keep the rewards (or losses)...
> But having Gov't / DOD contracts is not necessarily proof positive of a
superior product...
I think it probably makes a reasonable, limited space antenna, but not
nearly as efficient as a full size. At Tom pointed out you can't
violate the laws a physics. He made claims about working Europe with one
watt using one of those antennas. I worked a guy (on 6-meters) down in
Honduras who was testing his rig on the work bench. He antenna? A short
piece of wire stuck in the coax connector and laying on the bench. He
was more surprised than I was.
> Having said that, as an empirical antenna nutcase, I am unable to
visualize where bending my dipole into lebenty zillion short segments at
angles to each other will improve the performance...
It won't<:-)) It'll just let you put it into a limited space with most
of the associated drawbacks of a limited space antenna. Radiation
efficiency has to go down, but you do gain bandwidth...which reminds
me...so does a 50 ohm resistor. <:-))
> He and Tom, W8JI, got pretty personal in the dispute...
So that's what you call that?
> Tom made his antenna arguments with an analysis of the fractal antenna
based on the laws of physics, and some fairly deep math... Tom comes across
as a good old boy, but his education is solid in electrical engineering and
he has the annoying habit of being 'right' most of the time...
>
> Anyway, it has been peaceful since Chip left the scene (or was pushed)and
I prefer it that way...
Amen!
> denny / k8do
73
Roger (K8RI)
>
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