No, I don't want any more bandwidth to sweep!!!
Roger at Bugsweeps
http://www.bbc.co.uk/news/science-environment-18072618
16 May 2012 Last updated at 03:00 ET
Milestone for wi-fi with 'T-rays'
The device will be improved first by adding an antenna to increase its efficiency
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Researchers in Japan have smashed the record for wireless data transmission in the terahertz band, an uncharted part of the electro-magnetic spectrum.
The data rate is 20 times higher than the best commonly used wi-fi standard.
As consumers become ever more hungry for high data rates, standard lower-frequency bands have become crowded.
The research, published in Electronics Letters, adds to the idea that this "T-ray" band could offer huge swathes of bandwidth for data transmission.
The band lies between the microwave and far-infrared regions of the spectrum, and is currently completely unregulated by telecommunications agencies.
Despite the name, the band informally makes use of frequencies from about 300 gigahertz (300GHz or about 60 times higher than the current highest wi-fi standard) to about 3THz, 10 times higher again.
It is used principally for imaging in research contexts, as terahertz waves penetrate many materials as effectively as X-rays but deposit far less energy and therefore cause less damage.
Until recently, the technology required both to generate and detect these "T-rays" has been too bulky, costly or power-hungry to offer a plausible alternative to existing devices tucked within smartphones or wi-fi routers.
That looks set to change; in November electronic component firm ROHM demonstrated a 1.5Gb/s (1.5 billion bits per second) transfer rate at a frequency of 300GHz.
Terahertz wi-fi would probably only work within ranges of about 10m, but could in theory support data rates up to 100Gb/s - close to 15 times higher than the next-generation 802.11ac wi-fi standard that is under development.
The new work, by researchers from the Tokyo Institute of Technology, demonstrated 3Gb/s transmission at 542GHz.
At the heart of the team's 1mm-square device is what is known as a resonant tunnelling diode, or RTD.
Tunnelling diodes have the unusual characteristic that the voltage across them can sometimes go down as current is increased.
RTDs are designed such that this process makes the diode "resonate", which in the current work's design means it sprays out waves in the terahertz band.
The team is now working to improve their proof-of-principle device and extend its range deeper into the terahertz regime, as well as increasing its power output.
Thomas Shaddack
Well, it doesn't seem you have much of a choice.
On the positive side, this tech hitting mainstream will lead to parts
being available to work at this band. Which includes the possibilities for
novel through-material imaging devices for physical sweeps, and for
advanced material characterization and possibly even chemical imaging
(allowing e.g. inspections of wall surfaces for recent alterations).
On Sat, 27 Oct 2012, Roger at Bugsweeps wrote:
> http://www.bbc.co.uk/news/science-environment-18072618
>
>
>
> 16 May 2012 Last updated at 03:00 ET
>
> Milestone for wi-fi with 'T-rays'
>
>
>
> Related Stories
>
> for airport liquids
> * <http://www.bbc.co.uk/2/hi/science/nature/7827148.stm> Bendy gadget
> future for graphene
> * <http://www.bbc.co.uk/2/hi/technology/7287135.stm> Camera 'looks'
>
> Researchers in Japan have smashed the record for wireless data transmission
> in the terahertz band, an uncharted part of the electro-magnetic spectrum.
>
> The data rate is 20 times higher than the best commonly used wi-fi standard.
>
> As consumers become ever more hungry for high data rates, standard
> lower-frequency bands have become crowded.
>
> huge swathes of bandwidth for data transmission.
>
> The band lies between the microwave and far-infrared regions of the
> spectrum, and is currently completely unregulated by telecommunications
> agencies.
>
> Despite the name, the band informally makes use of frequencies from about
> 300 gigahertz (300GHz or about 60 times higher than the current highest
> wi-fi standard) to about 3THz, 10 times higher again.
>
> It is used principally for imaging in research contexts, as terahertz waves
> penetrate many materials as effectively as X-rays but deposit far less
> energy and therefore cause less damage.
>
> Until recently, the technology required both to generate and detect these
> "T-rays" has been too bulky, costly or power-hungry to offer a plausible
> alternative to existing devices tucked within smartphones or wi-fi routers.
>
> That looks set to change; in November electronic component firm ROHM
> Gbps+Version/article23346.htm> demonstrated a 1.5Gb/s (1.5 billion bits per