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A new design of reflective phase-shifting surface for generating an orbital angular momentum (OAM) vortex wave in the radio frequency domain is presented in this paper. The reflective phase-shifting surface consists of single-layer square patches periodically arranged. Theoretical formulations of phase-shift distributions are deduced and used to design the reflective phase-shifting surface producing...
Orbital Angular Momentum (OAM) has drawn great attention of worldwide academia in the recent years. It has been intensively applied in the domains of optics. Recent studies imply that OAM vortex wave can be used in radio not only limited to optics. Then, the application of OAM in radio has gradually become a research hotspot, and developing effective antennas to produce OAM beams is one of the key...
We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution of OAM beams on the number of array elements and array radius are analyzed. We also find phase delay deviation of 30 degrees leads to mode purity degrading to ∼1% and power deviation of 6 dB reduces the purity by <40%...
In this paper, the generation and steering of beams carrying orbital angular momentum utilizing a custom-designed circular antenna array has been demonstrated at 28 GHz. A steering angle as large as 30 degrees for an orbital angular momentum (OAM) beam has been achieved. The effect of number of antennas and the distance from antennas to the array center to the quality of beam generation and beam steering...
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