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Analysis of Losses in Articial Dilectric Waveguides at Mm-Wave Frequencies

Alizadeh, Arman | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43015 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rejaei, Behzad
  7. Abstract:
  8. Today as various electronic and telecommunication devices like cell phones and PDAs are being popularized, MMIC technology is gaining a significant importance. One of the priorities of this technology is trying to miniaturize these popular devices. But reducing size of passive microwave components used in these devices requires microwave wavelength to decrease.Components fabricated by conventional deposition techniques aren’t thick enough to reduce the wavelength, so permittivities much higher than those of conventional dielectrics could be a possible solution. Artificial dielectric layers (ADL) can provide such high permittivities.So utilizing these layers can possibly reduce the size of passive components.
    In this thesis an IC-compatible ADL will be investigated. Recently it has been used in loss reduction of mm-wave planar transmission lines in MMICs. Here we will study various electromagnetic properties of this ADL. We will use a transmission line model to extract effective permittivity and permeability of the layer and their dependence on dimensions of ADL’s structure. Loss mechanisms will be identified and methods will be presented to reduce these losses.
    After extracting ADL’s properties, we will try to design a disc resonator in 30-80 GHz frequency range using ADL. Several limitations in this design imposed by ADL will be identified.We will show how these limitations do not allow efficient design of such a resonator. But this ADL is still expected to reduce size of some passive microwave components like waveguides and filters on MMICs
  9. Keywords:
  10. Millimeter Wave ; Transmission-line Model ; Disk Resonator ; Monolitic Microwave Integrated Circuit (MMIC) ; Artificial Dielectric

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