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Analysis of Nonlinear Effects in Microstrip High Temperature Superconductor (HTS) by FDTD Method

Mollai, Sajjad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42793 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shishegar, Amirahmad; Fardmanesh, Mehdi; Banai, Ali
  7. Abstract:
  8. Nowadays high temperature superconductors (HTS) are very efficient and useful materials for microwave devices such as planar filters, resonators, hybrids, antennas and delay lines. The advantages of these devices are high quality factor, low insertion loss and reduced size. However the nonlinear effects of superconductors in high incident powers has limited usage of HTS in some applications and causes disadvantages such as reducing quality factor, intermodulation distortion and third harmonic generation of signal. The nonlinear effects of superconductor are due to the dependency of penetration depth and normal conducting coefficient to the current density of superconductor. Nonlinr effect increases in discontinuities like bends and steps. In this thesis the nonlinear effect of superconductor is simulated by finite difference time domain method (FDTD). For solving the electromagnetic field in superconductor we use both Maxwell’s and London’s equations simultaneously. Nonlinear effect of superconductor is count by considering the dependency of penetration depth and normal conducting coefficient to the total current density. We can simulate the planar structures like microstrips and striplines by the generated code.
  9. Keywords:
  10. High Temperature Superconductor ; Nonlinear Behavior ; Finite Difference Time Domain (FDTD) ; Microstrip Transmission Line

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