They passed each beam — which carried its own independent stream of data — through a «spiral phase plate» that
twisted each radio beam into a unique and orthogonal DNA - like helical shape.
The researchers hope to start testing a partially spiralled satellite dish within the next few days, then to use a similar device to transmit
a twisted radio beam several hundred metres across the lagoon in Venice three months from now.
Not exact matches
That is the claim being made by a group of scientists in Italy and Sweden, who have shown how a
radio beam can be
twisted, and the resulting vortex detected with distant antennas.