NIST has an article on these antennas and a photo of a prototype.

http://www.nist.gov/public_affairs/techbeat/current.htm

On Fri, 29 Jan 2010 18:02:03 -0800 (PST), Roger
wrote:

NIST has an article on these antennas and a photo of a prototype.

http://www.nist.gov/public_affairs/techbeat/current.htm

Yeah, yeah, yeah. Now, for the true test of comprehension, answer
this:
What is THE metamaterial?
(cut and paste in response is not an answer, in your own words please,
as YOU understand it)

For extra credit:
What IS metamaterial?
(cut and paste in response is not an answer, in your own words please,
as YOU understand it)

If this cannot be sensibly answered from the accumulation of you
reading of all links and bibliographies offered, then not much is
being offered up in the way of discussion.

73's
Richard Clark, KB7QHC

On 1/29/2010 10:46 PM, Richard Clark wrote:

...
What is THE metamaterial?
(cut and paste in response is not an answer, in your own words please,
as YOU understand it)

For extra credit:
What IS metamaterial?
(cut and paste in response is not an answer, in your own words please,
as YOU understand it)
...
73's
Richard Clark, KB7QHC

The materials used are very similar, in many cases exact, to the
materials used in TTD's (Temporal Tremor Detectors.)

Regards,
JS

Hmmm, I'm thinking it could be useful as an element for a frequency agile
radar array. Diversity radar?
If current radar detection systems rely on the target detecting an incoming
beam at a given pulse rate and frequency, then by varying the frequency and
pulse rate constantly, detection would be more difficult.
Computer hardware and software is sufficiently powerful to be capable of
processing the target returns at varying frequencies and GPS satellites can
provide a frequency locked source for synchronising the transmitter and
receiver, so you end up with effectively a stealth active radar system.
A wide band electrically tuned antenna would be essential for such an
application. It might even be able to detect stealthy aircraft and ships as
they tend to be optimized to absorb/divert frequencies in the most used
radar bands.
An electrically controlled frequency agile antenna which forms part of an
electrically steerable planar system would also be useful for jamming
multiple frequencies and sources. This could turn out to be a somewhat
expensive project.

Mike G0ULI

"Roger" wrote in message
...
NIST has an article on these antennas and a photo of a prototype.

http://www.nist.gov/public_affairs/techbeat/current.htm