Patent ID: 11088752

Abstract:
The disclosed systems, structures, and methods are directed to an orbital angular momentum (OAM) receiver. The OAM receiver comprising at least three receiver antenna elements configured to receive radiated OAM-RF waves and generate antenna element output signals, a selection-antenna switch operative to receive and switch between a second receiver antenna element RX2a output and a third receiver antenna element output RX2b, a phase adjusting unit configured to adjust a phase of the output of the selection-antenna switch, a hybrid coupler configured to provide a proportional summation and difference of the two modulated signals, a switching unit configured to limit the coupler output signal to gating time-intervals during which fractional pseudo-Doppler frequency shifts occur, an orthogonal filter bank configured to generate a vector X(t) containing shifted low-frequency values associated with all of the K OAM modes, and an adaptive unit configured to facilitate separation of the OAM-RF waves.