Orbital Angular Momentum Antennas: Understanding Actual Possibilities Through the Aperture Antennas Theory

@article{Morabito2018OrbitalAM,
  title={Orbital Angular Momentum Antennas: Understanding Actual Possibilities Through the Aperture Antennas Theory},
  author={Andrea Francesco Morabito and Loreto Di Donato and Tommaso Isernia},
  journal={IEEE Antennas and Propagation Magazine},
  year={2018},
  volume={60},
  pages={59-67}
}
In this article, we propose a method based on the aperture antennas theory to understand the limitations of orbital angular momentum (OAM) antennas in far-field links. Additional insight is also given by analyzing the properties of the operators relating source and farfield distributions for a given order of the vortex and emphasizing additional drawbacks. The degrees-of-freedom (DoF) of the fields associated with the different orders of the vortices are also discussed. 

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