Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old March 11th 12, 11:10 PM posted to rec.radio.amateur.moderated
external usenet poster
 
First recorded activity by RadioBanter: Mar 2012
Posts: 9
Default Can pasta-inspired radio waves could unclog the wireless world?

On 3/6/2012 10:49 AM, Bill Horne wrote:
I came across this story today, and I'd appreciate hearing other hams'
opinions as to whether this is possible. TIA.

Bill, W1AC
- - - - -

Pasta-inspired radio waves could unclog the wireless world

Agence France-Presse
6:39 am | Saturday, March 3rd, 2012

WASHINGTON—Radio waves that move like pasta spirals could help unclog
the wireless world by boosting the power of radio communications,
Italian and Swedish researchers said Friday.

The new way to make radio signals more potent without boosting bandwidth
is described in the Institute of Physics and German Physical Society’s
New Journal of Physics edition of March 2.

“In a three-dimensional perspective, this phase twist looks like a
fusillli-pasta-shaped beam,” lead study author Fabrizio Tamburini was
quoted as telling the science website 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.”

That means they do not move linearly like all current forms of radio
communications do, and they do not need more bandwidth to increase their
transmission capacity.

http://technology.inquirer.net/8897/...wireless-world


Sounds like circular polarization to me, Sat-TV uses it to put not one
but TWO transponders on the same frequency.

You can do the same between two FIXED sites using cross polarization,
however in the real world that does not work as well as circular... I
know, I've done it.

--
Nothing adds Excitement like something that is none of your business.
Remove the invalid part to email me.


  #2   Report Post  
Old March 27th 12, 12:13 AM posted to rec.radio.amateur.moderated
external usenet poster
 
First recorded activity by RadioBanter: Aug 2010
Posts: 63
Default Can pasta-inspired radio waves could unclog the wireless world?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

In John Davis writes:

On 3/6/2012 10:49 AM, Bill Horne wrote:
I came across this story today, and I'd appreciate hearing other hams'
opinions as to whether this is possible. TIA.

Bill, W1AC
- - - - -

Pasta-inspired radio waves could unclog the wireless world

Agence France-Presse
6:39 am | Saturday, March 3rd, 2012

WASHINGTON—Radio waves that move like pasta spirals could help unclog
the wireless world by boosting the power of radio communications,
Italian and Swedish researchers said Friday.

The new way to make radio signals more potent without boosting bandwidth
is described in the Institute of Physics and German Physical Society’s
New Journal of Physics edition of March 2.

“In a three-dimensional perspective, this phase twist looks like a
fusillli-pasta-shaped beam,” lead study author Fabrizio Tamburini was
quoted as telling the science website 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.”

That means they do not move linearly like all current forms of radio
communications do, and they do not need more bandwidth to increase their
transmission capacity.

http://technology.inquirer.net/8897/...wireless-world


Sounds like circular polarization to me, Sat-TV uses it to put not one
but TWO transponders on the same frequency.


You can do the same between two FIXED sites using cross polarization,
however in the real world that does not work as well as circular... I
know, I've done it.


--
Nothing adds Excitement like something that is none of your business.
Remove the invalid part to email me.



It's not circular polarization, rather, it's another characteristic of
an electromagnetic wave that is being exploited, Orbital Angular
Momentum (OAM). Circular polarization uses spinning (helical)
polarization E & M vectors. This proposed technology would use a
helical wavefront by introducing a time-delay (or phase) distribution of
components of the signal from a dish or array.

I read the latest paper and watched the video abstract at the following link:

http://iopscience.iop.org/1367-2630/14/3/033001/article

but can't say that I completely understand it. The clearest description
of modulation and frequency reuse of OAM that I found appears to be this
article in New Scientist from 2009, including its use in HAARP:

http://www.newscientist.com/article/...-airwaves.html

Quote from the above article:

"The twists remain coherent across vast distances - light years, even
- and can store information in the form of digital bits (1s and 0s),
encoded into the pitch of the twist."

The discussion at this link may also help illuminate the subject better:

http://www.physorg.com/news/2012-03-...io-venice.html

The latest discovery wasn't the theory itself, but rather a practical
demonstration at radio frequencies. OAM is well-known in quantum
mechanics, as well as in electromagnetic radiation at optical
frequencies in the field of astronomy.

- --
73, Paul W. Schleck, K3FU

http://www.novia.net/~pschleck/
Finger for PGP Public Key

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (SunOS)

iD4DBQFPcL2m6Pj0az779o4RAowzAJ92193Zv8sNoy7BV45l8w So1+t6JwCUCwyI
YAD2HyiQ/M+fwfDNMQP0EQ==
=PloZ
-----END PGP SIGNATURE-----



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
What kind of radio are you buying with your Republician inspired taxrebate? N9NEO[_2_] Shortwave 8 April 26th 08 09:15 PM
Wireless World & Radio Engineering magazines Bob G. Mahrenholz Homebrew 8 June 11th 06 05:42 AM
Wireless World magazine Adri Homebrew 0 November 30th 04 02:57 PM
Traveling Waves, Power Waves,..., Any Waves,... pez Antenna 10 December 13th 03 03:43 PM
World War II - The Wireless War WD4LCM Shortwave 0 July 10th 03 02:00 AM


All times are GMT +1. The time now is 10:28 PM.

Powered by vBulletin® Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright ©2004-2017 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017