Influence of the Communication Environment on Orbital Angular Momentum (OAM) Mode Orthogonality

Michael Wulff, Lei Wang, Alexander Koelpin, Christian Schuster

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, the impact of the environment between two communicating orbital angular momentum (OAM) antennas on the orthogonality of the OAM mode is investigated. Orthogonality means one mode's excitation cannot be created by combining other modes. If the orthogonality of the modes is perturbed, inter-mode interference (IMI) occurs between the OAM modes. The question is asked how to improve the environment to minimize IMI. OAM-based communication offers the potential to use orthogonal modes as separate communication channels, but certain environments limit this potential by introducing IMI. It is, therefore, advantageous to investigate the conditions under which IMI occurs. To that aim, the OAM wave transmissions through several environments will be explored numerically using a tool based on the method of moments. It is shown that the orthogonality of the OAM mode requires cyclic symmetry in the environment, and the deviation from this symmetry determines the strength and type of IMI.

Original languageEnglish
Title of host publication53rd European Microwave Conference 2023
Number of pages4
ISBN (Electronic)9782874870729
Publication statusPublished - 30 Oct 2023
Event53rd European Microwave Conference 2023 - Berlin, Germany
Duration: 19 Sept 202321 Sept 2023


Conference53rd European Microwave Conference 2023
Abbreviated titleEuMC 2023


  • cyclic symmetry
  • inter-mode interference (IMI)
  • orbital angular momentum (OAM)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Instrumentation


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