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Analysis of 2D Propagation of Unidirectional Waves in Layered Ferrite Structures for Frequency Demultiplexing

Yazdani Khalkheili, Ali Akbar | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58633 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rajaei, Behzad; Memarian, Mohammad
  7. Abstract:
  8. Ferrites are magnetic materials with unique electromagnetic properties that make them highly attractive for advanced wave–based devices. Their asymmetric magnetic permeability tensor enables nonreciprocal responses, while the strong frequency dispersion of permeability supports the propagation of short‐wavelength magnetostatic waves. Furthermore, the permeability tensor can be tuned and controlled through an external magnetic bias field, offering significant flexibility in device design. The interplay of nonreciprocity, anisotropy, and strong dispersion gives rise to distinctive wave phenomena in ferrite media. In particular, layered ferrite structures support magnetostatic modes whose propagation direction is frequency dependent and, under certain conditions, can become unidirectional. In this thesis, we investigate the two-dimensional propagation of such waves in layered ferrite structures to design frequency-selective isolating components with minimal reflection at different angles. The research combines analytical derivation of rare propagation modes, detailed examination of two-dimensional dispersion characteristics across frequencies, ray-based simulations, and finite-element numerical modeling. The outcomes provide a foundation for novel compact microwave devices with enhanced performance in frequency separation and isolation
  9. Keywords:
  10. Landau-Lifshitz Equation ; Magnetic Permeability Tensor ; Magentostatic Waves ; Ferrite Structures ; Magnetic Permeability ; Unidirectional Waves

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