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Scattering Analysis from Periodic Rough Surfaces Using Spectral-FDTD

Kianinejad, Amin | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40871 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shishegar, Amir Ahmad
  7. Abstract:
  8. In this thesis the scattering analysis of periodic rough surfaces is studied using the Spectral Finite Difference Time Domain (SFDTD) method. This method takes advantages of both wideband frequency response and stability criterion for all incident angles compared to other methods in solving the periodic problems. In the SFDTD method a wave with Constant Transverse Wavenumber (CTW) is used as the incident wave. As a result, the problem of time delay in periodic boundary is solved and Periodic Boundary Condition (PBC) can be implemented in time domain directly. Periodic rough surfaces are important part of electromagnetic propagation surfaces. Therefore analysis of scattering from these surfaces makes a great contribution to the propagation problems. Analysis of scattering from dispersive and periodic structures with SFDTD is another novel aspect of this thesis. The sources of errors are also studied in this thesis and in order to diminish these errors, some approaches are suggested. To evaluate the SFDTD code, different periodic problems are solved and the results are compared with the result of other methods such as analytic methods, MOM and commercial software of CST. The SFDTD method is applied to dispersive structures too. Moreover, some new ideas are suggested in order to accelerate the SFDTD method. Reducing the timewidth of incident field and solving the problem for simultaneous incidence of multiple wave are studied in this
    thesis as well.
  9. Keywords:
  10. Scattering ; Periodic Rough Surface ; Periodic Boundary Condition ; Spectral Finite Difference Time Domain (SFDTD)Method ; Time Domain Method ; Constant Transverse Wavenumber (STW) ; Dispersive Structures

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