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Design of Impedance Surfaces with Metamaterials and Metasurfaces to Implement Line Wave

Hajebrahimi, Marzieh | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54542 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Khavasi, Amin
  7. Abstract:
  8. In this thesis we introduce line wave. Which propagates only in one direction and dissipate in other direction. Line wave can propagates at the interface of two complementary impedance surfaces. There are various ways to build a waveguide which can support line waves like complementary structures. In this thesis we try to find a way which will not use complementary structures. Hence we use Spoof Surface Plasmon Polariton concept to mimic complementary structure characteristics. A complementary surface-based waveguide consists of two parts; one part supports TE polarization waves and the other one supports TM polarization waves. When these TE and TM waves face each other in the boundary, line wave emerges. Though at first place the complementary surface impedances were produced through complementary surfaces, but we redesigned these complementary surface impedances by using array of holes in the PEC film with height of h which we assume is and is the working wavelength. Through text we have found admittance of array of holes in PEC film, to find a best constant period of holes arrays which is equal to . After finding suitable period, we sweep dimensions of holes to find best design of surface impedance which can support TE and TM polarization, in this case dimensions of holes for TE and TM structures equals to , and . After designing, we have simulated this waveguide with CST microwave to confirm, this waveguide can support line waves. Then we have studied properties of this new waveguide through its effective index and confinement, and we compared the results with ideal waveguide which consist of two planes (PEC and PMC films) and also chose copper as a real material for our waveguide instead of PEC
  9. Keywords:
  10. Metasurfaces ; Metamaterial ; Spoof Surface Plasmon Polaritons ; Surface Waves ; Line Waves ; Impedance Surface

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