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Analytical calculation for input impedance of a circularly-polarized ferrite disk antenna including higher order modes

Ahmadvand, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1002/mmce.21783
  3. Publisher: John Wiley and Sons Inc , 2019
  4. Abstract:
  5. We propose an accurate analytical model for a circularly polarized antenna comprising a normally magnetized, grounded ferrite disk with a metalized top surface. The antenna is assumed to be excited by a conventional current probe. In the case of a thin ferrite disk, the electromagnetic fields of the dominant mode of the antenna do not vary in the direction normal to the disk. However, with increasing thickness of the ferrite disk, higher order modes start to affect antenna characteristics such as resonance frequency. This work presents an analysis of the structure that takes into account all higher modes of the antenna. To validate the theoretical calculations, HFSS simulations are performed. The antenna can be tuned by changing the magnetic bias field. © 2019 Wiley Periodicals, Inc
  6. Keywords:
  7. Circular polarization ; Higher modes ; Wide-angle axial ratio ; Electromagnetic fields ; Ferrite ; Analytical calculation ; Antenna characteristics ; Axial ratio ; Circularly polarized antennas ; Ferrite substrate ; Higher mode ; Theoretical calculations ; Tunable antenna ; Antennas
  8. Source: International Journal of RF and Microwave Computer-Aided Engineering ; Volume 29, Issue 8 , 2019 ; 10964290 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/mmce.21783