Shielding of Orbital Angular Momentum Waves by a Cavity With Apertures

Michael Wulff, Woocheon Park, Lei Wang, Cheng Yang, Heinz Dietrich Bruns, Christian Schuster

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Abstract

In this article, for the first time, the shielding of orbital angular momentum (OAM) waves by a cavity with apertures is evaluated. This is particularly interesting because the distinguishing feature between the OAM modes is their phase distribution in space, and, hence, shielding effectiveness is a mode-dependent phenomenon. A perfectly electrically conducting cavity with multiple apertures and two OAM antennas, inside and outside the cavity, is investigated using a method of moments based tool. The behavior of OAM waves is analyzed by comparing the transmission between the OAM arrays for different cases, including their field patterns in front of and behind the apertures. The effects of the orientation and position of the transmitting antenna, the rotation, size, and form of the apertures and different cavities are explored. Additionally, the effect on the distance and the orientation angle of the outer antenna are studied. It is shown that the propagation of OAM waves through apertures is possible and that the resulting signal loss is similar to the loss of a plane wave or the field of a monopole. It is also shown that certain OAM waves penetrate the apertures better than others.

Original languageEnglish
JournalIEEE Transactions on Electromagnetic Compatibility
Early online date14 Feb 2022
DOIs
Publication statusE-pub ahead of print - 14 Feb 2022

Keywords

  • Antenna arrays
  • Antennas
  • Apertures
  • Conducting cavity
  • electromagnetic shielding
  • Method of moments
  • orbital angular momentum (OAM)
  • propagation modeling
  • Scattering parameters
  • Slot antennas
  • slot aperture
  • Transmitting antennas
  • uniform circular arrays

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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