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Analysis of Scattering of Unidirectional Pulses from Barriers in Ferrite Structures

Yousefi, Pedram | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57281 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rejaei Salmasi, Behzad; Memarian, Mohammad
  7. Abstract:
  8. In wave theory, it is conventional to divide media into reciprocal and non-reciprocal types. The Lorentz reciprocity theorem is the most prominent theorem in electromagnetic theory. One wave phenomenon that can be explained by the reciprocity theorem is unidirectional waves. These waves are well-known in the literature and have diverse practical applications. However, in this research, we explore some curiosity-driven questions regarding their behavior near barriers. We hypothesize that new applications might be discovered for these waves. In summary, we analyze the behavior of unidirectional waves when they encounter barriers. The main question is: if unidirectional waves cannot propagate in the reverse direction, what happens when we collide a series of modulated pulses with these barriers and they subsequently aggregate? Can we separate these pulses before they completely attenuate? If we change the direction of the unidirectional structure after aggregation, can we observe the initial order of the pulses? Our goal is to explore new platforms for use in memory devices and switches. The unidirectional platform we use for analyzing these questions is a half-filled ferrite waveguide. Ferrite media are inherently non-reciprocal, and under such conditions, they can support unidirectional modes. In this research, we first explain the unidirectional modes in half-filled ferrite waveguides. We then discuss why we chose a finite-difference time-domain (FDTD) numerical algorithm to solve this problem. To implement a robust simulator based on the FDTD algorithm, we follow several steps. Next, we implement a switching process based on the dispersion diagram of such structures. Finally, we simulate our scenarios and suggest directions for future work
  9. Keywords:
  10. Unidirectional Waves ; Ferrite ; Magnetostatic Approximation ; Dispersion Diagram

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