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Influence of the communication environment on orbital angular momentum (OAM) mode orthogonality
Publikationstyp
Conference Paper
Date Issued
2023-09
Sprache
English
Start Page
786
End Page
789
Citation
53rd European Microwave Conference (EuMC 2023)
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
Institute of Electrical and Electronics Engineers Inc.
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.
Subjects
cyclic symmetry
inter-mode interference (IMI)
orbital angular momentum (OAM)
DDC Class
620: Engineering
530: Physics