Inter Mode Interference in Circular Antenna Arrays for Orbital Angular Momentum (OAM) Based Communication

Michael Wulff, Lei Wang, Cheng Yang, Christian Schuster

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

Abstract

Optimization of antenna arrays is essential to achieve high data rates in modern communication systems. One promising array used in future communication systems is the uniform circular array (UCA) carrying orbital angular momentum (OAM) modes. In a UCA, the array elements are arranged in a circle with uniform angular spacing. The OAM modes are defined by the excitation of an array, i.e. an OAM mode is excited by exciting each element with equal amplitude and a phase increasing linearly around the array. When one OAM mode is excited and another OAM mode is received, this is called inter mode interference (IMI). Within an array this could be caused by a non-symmetrical array structure. In this paper, the IMI of non-symmetrical UCAs operating OAM waves is explored with comparison to the symmetrical UCA. It is shown, that change in geometric deviation along the array can be used to determine the dominant IMI, which allows the prediction of the IMI when designing an OAM array. These predictions are validated using an elliptical array and an array with misaligned elements. Knowledge of the IMI caused by a geometrical deviation can be used in the future to prevent or correct this IMI.

Original languageEnglish
Title of host publication2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
PublisherIEEE
Pages1976-1977
Number of pages2
ISBN (Electronic)9781665496582
DOIs
Publication statusPublished - 21 Sep 2022
Event2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Denver, United States
Duration: 10 Jul 202215 Jul 2022

Conference

Conference2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
Abbreviated titleAP-S/URSI 2022
Country/TerritoryUnited States
CityDenver
Period10/07/2215/07/22

Keywords

  • inter mode interference (IMI)
  • orbital angular momentum (OAM)
  • uniform circular array (UCA)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Instrumentation

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