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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53175 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Khavasi, Amin
- Abstract:
- This thesis examines a new electromagnetic mode called line mode. This mode occurs when the boundaries have complementary surface impedances. It is possible to control the mode confinement by changing the surface impedance values. Impedance surfaces with non-complementary impedances guides the quasi-line mode, which is a mode between the line mode and the edge mode. Essential features of the line wave are its singularity over the line, its broad bandwidth, and its robustness to certain defects. Another significant characteristic of a line wave is that unlike surface waves in which it is not possible to change the spin orientation, in a line wave, the spin orientation can be altered by adjusting the surface impedance values. The linear waveguide structure directs direction-dependent polarizations called pseudo-spins. In this thesis, with the help of the duality principle, we have proved that eigenmodes, which occur in the interface of the two complementary structures, are the pseudo-spin modes. Implementation of a line wave with non-graphene structures exhibits a stable performance. While in the implementation of line wave with graphene, it is possible to program the waveguide so that we can guide the line wave in dynamic path
- Keywords:
- Spin ; Singularity ; Quasilinearity ; Impedance Surface ; Quasi-Line Mode ; Peseudospin
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