Effect of the Orientation of the Array Elements of Uniform Circular Antenna Arrays on Orbital Angular Momentum (OAM) Modes

M. Wulff*, L. Wang, C. Yang, C. Schuster

*Corresponding author for this work

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


In this paper, the effect of the orientation of the array elements of a uniform circular antenna array (UCA) on orbital angular momentum (OAM) communication is investigated. For the first time, UCAs are studied in which the elements are rotated in a systematic way around their center by a linearly increasing angle of rotation. It is shown here that these UCAs provide a smaller decrease in transmission over distance for some modes compared to other configurations used, but at the cost of increased mode conversion. For that reason the mode conversion and the decrease of the received mode power over distance are of particular interest. U CAs with dipoles normal and tangential to the array surface are compared. For the latter, the dipoles are rotated around their center with a rotation angle increasing linearly around the U CA. The transmission of the OAM modes is evaluated on a sphere, showing that the direction of the strongest transmission of the OAM modes varies with the rotation of the array elements. It is shown that the U CAs with radial (or azimuthal) dipoles provide the best mode transmission with little mode conversion. All investigations have been carried out using a tool based on the method of moments (MoM).

Original languageEnglish
Title of host publication14th German Microwave Conference 2022
Number of pages4
ISBN (Electronic)9783982039725
Publication statusPublished - 31 May 2022
Event14th German Microwave Conference 2022 - Ulm, Germany
Duration: 16 May 202218 May 2022


Conference14th German Microwave Conference 2022
Abbreviated titleGeMiC 2022


  • orbital angular momentum (OAM)
  • uniform circular array (UCA)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Instrumentation


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