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Measurement of Anisotropy in Microwave Substrates and Design Band Pass Filters Considering the Anisotropy

Mojaveri, Hossein | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56526 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Farzaneh, Forouhar; Banai, Ali
  7. Abstract:
  8. Nowadays dielectric substrates are widely used in Microwave Integrated Circuits. These substrates are made layer by layer in order to have favorable mechanical and thermal properties. The materials of the layers are usually different from each other and often each layer is a combination of different materials. This difference in material type and manufacturing method causes the substrate to have a different permitivity coefficient in two major directions, namely parallel and perpendicular direction. In fact, the electric field observes a different permitivity coefficient in each direction. This causes a problem in circuits that have both perpendicular and parallel electric field components and usually causes a frequency shift in the circuit response. For example, in couplers where there are both even and odd modes, and in each of the modes, the directions of the fields are different the problem of anisotropy arises. Usually, this effect is more visible in Band-pass filters, whose performance is based on coupled lines. This issue causes the designs to encounter some errors, and fixing such errors usually takes a lot of time and money. While if a more complete specification of the substrates is available, a more optimal design can be achieved with less time and cost. In this project, the aim is to provide a structure for measuring the two orthogonal permitivity coefficients for widely used and available substrates. After measuring the vertical and parallel components of the permitivity coefficient for widely used substrates, a number of Band-pass filters are designed with and without anisotropic permittivity and the accuracy of the measurements made in each case is evaluated
  9. Keywords:
  10. Anisotropy ; Bandpass Filters ; Orientation ; Electric Permitivity Tensor ; Couplers

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