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The congestion of the radio frequency bands imposes serious limitations onthe capacity and capability of modern wireless information infrastructures. Oneapproach to enable frequency re-use is to exploit other physical conservedquantities of the electromagnetic fields, such as the orbital angular momentum(OAM) in addition to linear momentum, which is exploited in present-daytelecommunications. Whereas in the optical regime the increase of channelcapacity by using OAM states was demonstrated recently, the receiving antennasin commercial radio links have a much smaller extent than the transmitted beam,making the signal reception and characterization of the OAM state demanding.Moreover, radio data transmission with more than two channels per polarizationstate at the same frequency for radio links is known to be notoriouslydifficult to realize even with multiport techniques, long antenna baselines anddigital post-processing. Here we report results from an outdoor, proof ofconcept experiment where the physical properties of OAM states were used totransfer information, using far-field multiplexing/demultiplexing of threecoexisting collinear, vertically polarized and mutually independent OAM radiobeams, opening new perspectives in wireless telecommunications.

N-tupling the capacity of each polarization state in radio links by using electromagnetic vorticity