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'[EE]: take this with a grain of ......'
2006\07\17@225145 by Gus S Calabrese

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www.eet.com/news/design/showArticle.jhtml?articleID=190500004
this is like a jump drive except wireless with a very very  short range.
How can the antenna be so small ?


Gus S Calabrese
Denver, CO
720 222 1309     303 908 7716 cell
I allow everything with  "spamcode2006"  in the subject or text to  
pass my spam filters


2006\07\18@052659 by Howard Winter

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Gus,

On Mon, 17 Jul 2006 20:51:42 -0600, Gus S Calabrese
wrote:

>
www.eet.com/news/design/showArticle.jhtml?article
ID=190500004
> this is like a jump drive except wireless with a very
very  short range.
> How can the antenna be so small ?

By using a very high frequency!  An antenna of 1/4
wavelength is reasonably efficient, so if their
wavelength is about 16mm, a 4mm long antenna is fine.  
Off the top of my head I think that's about 20GHz, but I
may have slipped an order of magnitude...

Cheers,


Howard Winter
St.Albans, England


2006\07\18@143948 by Sergey Dryga

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Gus S Calabrese <gsc <at> omegadogs.com> writes:

>
> www.eet.com/news/design/showArticle.jhtml?articleID=190500004
> this is like a jump drive except wireless with a very very  short range.
> How can the antenna be so small ?
>
I remember seeing in another article about it that the range is 1.5 mm.  No
need for high-gain, high-efficiency antenna at this distance.

Sergey Dryga
http://beaglerobotics.com


2006\07\18@164258 by Gus S Calabrese

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They are claiming inductive coupling which I thought was a different
set of technical issues.  AGSC


On 2006-Jul 18, at 12:39hrs PM, Sergey Dryga wrote:

Gus S Calabrese <gsc <at> omegadogs.com> writes:

>
> www.eet.com/news/design/showArticle.jhtml?articleID=190500004
> this is like a jump drive except wireless with a very very  short  
> range.
> How can the antenna be so small ?
>
I remember seeing in another article about it that the range is 1.5  
mm.  No
need for high-gain, high-efficiency antenna at this distance.

Sergey Dryga
http://beaglerobotics.com


2006\07\18@170836 by Mike Hord

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> www.eet.com/news/design/showArticle.jhtml?articleID=190500004
> this is like a jump drive except wireless with a very very  short range.
> How can the antenna be so small ?

I'm sorry, but could someone explain to me why this is being presented
as something new and exciting?  No offense to Gus, but a generally
cocked eyebrow for the people at HP who are making this out to be a
huge deal.

It sounds like a high density high speed RFID chip to me.  My cat has
one about that size implanted in his scruff, with a range greater than
1.5mm, but lower data rate and density.  I'm not sure trading R/W
range for speed and capacity makes it a whole new frontier- if you
read the article, in fact, they're using the same examples, claims,
and buzzwords people have been using for years about RFID.

Mike H.

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