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Implementation of a unidirectional-mode ferrite disk antenna using permanent magnets and a two-stage matching network

Bagheri, A. M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2020.167529
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. We experimentally demonstrate a circularly polarized antenna that utilizes unidirectional surface waves that propagate on the boundary of a small ferrite disk. The ferrite disk is metalized on top and is mounted on a grounded dielectric substrate. The disk is normally biased by a magnetic field that is provided by two permanent magnets below and above the structure. A two-section feeding network is used to feed the antenna. The operation frequency of the antenna can be adjusted by changing the magnitude of the applied magnetic bias. The sense of polarization can be reversed by reversing the direction of the applied bias. © 2020 Elsevier B.V
  6. Keywords:
  7. Dielectric materials ; Ferrite ; Permanent magnets ; Surface waves ; Circularly polarized antennas ; Dielectric substrates ; Feeding networks ; Ferrite disks ; Magnetic bias ; Operation frequency ; Stage-matching ; Unidirectional mode ; Antenna feeders
  8. Source: Journal of Magnetism and Magnetic Materials ; Volume 521 , 2021 ; 03048853 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0304885320324963