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Analysis of Artificial Dielectric Waveguides for Millimeter Wave Applications

Barzegar Parizi, Saeedeh | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47856 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rejaei, Behzad
  7. Abstract:
  8. Millimeter wave technology may prove to be one of the key technologies of the 21st century, covering a broad range of applications including high-speed telecommunication, wireless sensing, and ultra-fast digital computing. The ultimate (commercial) success of these technologies depends on the ability to integrate mm-wave circuitry on a chip, bringing about significant size and cost reduction. Traditionally, mm-wave systems have made extensive use of waveguides based on hollow- or dielectric-filled metallic cavities for the transfer and processing of signals. Cavity waveguides exhibit very low loss, but are not well-suited to high volume manufacturing or on-chip integration due to their non-planar structure and large dimensions. By contrast, today’s MMICs commonly deploy transmission lines built from planar metallic conductors. Although highly suited to on-chip integration, these components do not perform adequately at mm-wave frequencies due to unavoidable conductor losses. This calls for the exploration and development of alternative transmission media which, while compatible with the modern IC technology, exhibit the high performance of cavity waveguides. The goal of this project is to explore artificial dielectric waveguides as a low-loss, but IC-compatible alternative to cavity waveguides and transmission lines. Such devices can be viewed as microwave analogues of planar optical waveguides implemented on optical chips. These artificial films will be built from stacked arrays of (sub) micron-size, 2D metallic particles immersed in a conventional dielectric using an IC process. The high (effective) dielectric constant of the films yields a major reduction of the propagation wavelength, allowing the realization of devices 2-3 times compacter than cavity waveguides. However, knowing the electric and magnetic properties of structure is a fundamental step to design of artificial dielectric waveguides. Therefore, at first, we extract the electromagnetic properties by numerical methods then we will explore planar artificial dielectric waveguides as high-quality interconnections with potential application for virtually all integrated mm-wave systems. By the way, one of the most problems is the survey of the surface effects in artificial dielectrics. A new method is presented for the extraction of the bulk and surface parameters of two-dimensional periodic artificial media. In the following, we analyze the artificial structures made of graphene ribbons and disc at optical frequencies. Graphene structures have attracted much attention due to their unique electrical and optical properties. It has been shown that, in array form, these graphene derivatives yield remarkable optical absorption enhancement, despite the fact that a single atomic sheet of graphene absorbs only 2.3% of light in the infrared to visible spectral range. Moreover, arrays of graphene nanoribbons and graphene nanodisks possess dual inductive-capacitive nature which is studied in this thesis
  9. Keywords:
  10. Artificial Dielectric ; Integrated Circuit ; Millimeter Wave ; Graphene-Based Waveguides ; Artificial Medias ; Planar Waveguides

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