Determination of the orbital angular momentum state of a radio wave beam based on quantitative characteristics of a radio communication system

Nowadays, due to the lack of available radio frequency spectrum, there is a need for the devel-opment of technologies that would make it possible to use this spectrum more efficiently. One such technology involves the use of radio waves with orbital angular momentum (OAM). This pa-per proposes a new quantitative method for determining the number of single states of a beam car-rying OAM based on an analysis of the S21 system parameters. This allows the receiver to be tuned to receive beams with a specific OAM state. The radio waves carrying OAM have a fre-quency of 80 GHz. In this work, a pyramidal horn was used as a transmitting antenna, with a spiral phase plate used to twist the emitted radio wave. An array of receiving antennas was in the form of dipoles. Limitations of this method were investigated. This work is a computer experiment.