Somewhere in internet there is (where ?) a video showing the experiment, done in Venice during what it seems a Carnival event. To me, it has a slight taste of a joke, included the strange parabolic dish.
I2LQF, Fabio On 04/05/2012 8.25, Erik Basilier wrote: > Oh, and the first thing I looked at was whether it was in the April issue. > It was not. Maybe the IEEE got it from another publication's April issue? > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Erik Basilier > Sent: Thursday, May 03, 2012 10:10 PM > To: [email protected] > Subject: [Elecraft] OT: Distinguishable angular momentum in radio photons? > > The May 2012 issue of the IEEE Spectrum magazine reports that researchers in > Italy and Sweden were able to conduct two separate instances of radio > communication on the exact same frequency, without increasing bandwidth, and > without time-division multiplexing, be making the transmissions differ in > angular momentum. One transmission used linear polarization, and the other > was given angular momentum by means of a dish with a radial cut, where the > metal was bent backwards/forwards on the two sides of the cut. Apparently > this is not just a case of linear vs circular polarization, as circular > polarization can be readily picked up by a linearly polarized antenna, and > apparently the two channels did not interfere with each other. The > researchers claim that this demonstration points to the possibility that the > radio photons can be given multiple, quanized levels of angular momentum, > making possible several more communication channels without increased > bandwidth. Other researchers say that this is just a form of MIMO. Wikipedia > describes MIMO as the technique of using multiple antennas as in diversity > reception or in gain increases obtained by phasing the antennas. > > > > My apologies if this is too far OT. > > > > 73, > > Erik K7TV > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
