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Abstract:   (116 Views)
In this manuscript, higher-order Orbital Angular Momentum (OAM) modes and parameters affecting vortex in the radiation pattern have been studied. A uniform circular array resonating at 10 GHz frequency is formed using eight identical rectangular patch antennas. Three uniform circular arrays are analyzed, simulated, and fabricated for OAM modes 0, +1, and -1 respectively. The higher-order OAM modes ±2, ±3, and ±4 are simulated and their effects on radiation and phase pattern are discussed. The effect of number of antenna elements and radius of the circular array on the phase purity of higher order OAM modes is presented. The results of simulated radiation patterns and phase front are well satisfying the generation of OAM modes. The measured results show a close agreement with the simulated result.
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  • In this work, three different antenna arrays are designed and fabricated to generate three OAM modes [mode 0, mode +1, and mode -1]. The fabricated OAM antenna is compact related to other uniform circular array OAM antenna. The purity of OAM pattern of each mode is also improved to some extent by using of radial orientation array elements.
  • Apart from successfully generated the OAM beam, the effect of dimensional parameters like antenna array radius (R) and  number of antenna element (N), on directivity pattern and vortex null-width is also analyzed and results have been shown.
  • The effect of increasing OAM mode (l = 0 to +4) on the vortex null-width and in absolute directivity is also analyzed and results have been shown.
  • The OAM phase for mode 0 to 4 is simulated to study the effect on the purity of OAM phase pattern and maximum possible OAM modes are observed.
  • All these results are compared with two other similar kinds of works.

Type of Study: Research Paper | Subject: Antenna
Received: 2020/03/09 | Revised: 2020/08/26 | Accepted: 2020/09/06

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© 2020 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.