Posting in Environment
"Twisted" radio waves can carry significantly more data and could even signal infinite Wi-Fi capacity.
With the explosion of digital devices, radio waves have become increasingly congested—but scientists in Italy and Sweden may have found a way to eradicate the problem completely by making a few minor tweaks to the current technology.
The key lies in changing the shape of radio waves. Scientists discovered that when twisting waves into a spiral shape, existing frequencies could hold multiple data streams instead of just one. In theory, the new technique allows for an infinite number of channels to exist in any one fixed bandwidth.
“In a three-dimensional perspective, this phase twist looks like a fusillli-pasta-shaped beam, study author Fabrizio Tamburini told PhysOrg. “Each of these twisted beams can be independently generated, propagated and detected even in the very same frequency band, behaving as independent communication channels.”
Tamburini and study co-author Bo Thide of the Swedish Institute of Space Physics demonstrated their findings outside the laboratory in Venice last June. Using twisted radio waves, the physicists were able to send two audio signals within the bandwidth required by one across the lagoon and over a distance of 442 m (1450 ft).
Perhaps best of all, the technique doesn’t require new and expensive technology. The demonstration in Venice was made using a regular satellite dish—the team simply cut one side to create a helical shape. To detect the twisted waves, an additional antenna was needed.
According to Tamburini, it’s plausible to have 55 channels in the same band of frequency. His findings are published in the New Journal of Physics.
Video: New Journal of Physics, Image: Roger Karlsson/Flickr
Mar 3, 2012
Would certainly help with the mass amounts of wireless/cellular devices out there. [url=http://no.women-girls.com/]russiske damer[/url]
Are there no journalists left who will adopt a rigorous attitude to these press releases? I would be delighted and impressed if this development were substantiated. I am not at all expert in RF, I am in awe of those who are. But this "demonstration" provides no useful or verifiable results. Analysing the Signal to Noise ratio of the resulting mish-mash signal will, I suspect, show that Shannon can rest easy. This staged event is more about fame and funding, no so much about facts.
Parabolic antenae are uni-directional. Consumer wireless communication devices, in general, are omni-directional. This is not a solution that addresses the consumer wireless frequency spectrum saturation/congestion.
The clamor and jockeying for position for "bandwidth" requirements, cutting off some frequencies from some users to allocate to other users could all be a thing of the past! It could also result in new government funds for licenses to use the extra 'bandwidth' (or a name to be determined), something our government always seems to need.
Would certainly help with the mass amounts of wireless/cellular devices out there. Especially so for WISPS, as they could probably increase their bandwidth by a large amount by running multiple channels through point to point.
Thanks for the info! It occurred to me that with the ability now that is developing to combine optical components on silicone chips or all optical chips that the bandwidth opened up here will or can be just phenomenal! I passed on the link to a 'Netizen' for his comment and maybe to write a paper on it... This individual himself is quite an interesting 'find' but you would need to 'vet' his assertions as 100% correct before you went out on a limb and published... Reading his first two papers will give you all the 'Gut Feeling' that you may need to pursue him just a little further... This info on twisted light seems to me to have implications in many many fields, I don't think that it overturns Shannon's communications theory it just gives many more 'channels' to apply it too. Oh!...the web site is http;//www.milesmathis.com He is also an artist, a painter, and his art site is here http://www.mileswmathis.com He writes science papers 'on the side', he writes very well. Thank you for a very interesting development.
CHEAPEST ALL OVER THE WORLD FOR FASHION GOODS ...L.V..www....|.myvoguestore.com ..N.I.K.E..|||"|""___ ....U.G.G..|__________________|||_|___|)
is being used in some astronomical observations. it is produced naturally in space. since radio is just low frequency light, why don't YOU get your expertise in RF before you bloviate about showmanship and data?
This sounds like a modern twist on the old Single Side Band capability of CB radios. They could probably pull off this demonstration transmitting data on a modified CB radio.
Always involved. Should only be there to assist . Politics enters lobbying enters and what is good is missed. There has been technology the solves these small problems that the government and big interests build or create. Forget that just look at smartphones. When the iphone debuted wireless phone co. gobbled them up lured subscribers with the device into the contract. Almost endless numbers to the point the wireless industry forgot that there might be a congestion problem . These are problems? Apple laughing. Its more like what you perceive. Technology is not the problem,the business model is messed up. Disagree if you want. Someone explain 4g then. Where is it? Is it even possible? Are they lying? The government lets them advertise as if it is true. Don't need anyone to explain except to yourself. Remember this business model messy, technology suppressed.