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Optimization of Maximum Frequency and Power, Extraction of Parameter Data and Final Publication Design of High Power Microwave Pulse Generation Using nonlinear Transmission Line with the Periodic Structure of the Gas Switch

Komeylian, Saeed | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45663 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mahmood
  7. Abstract:
  8. High-power (108 – 109 W) RF pulses with a carrier frequency of C band and a duration of several oscillation periods can be produced through direct energy conversion of a travelling high-voltage pulse with the use of nonlinear elements.
    Nonlinear transmission lines consist either of lumped nonlinear elements and provide spatial dispersion of excited oscillations or of elements uniformly distributed on a certain line segment. The first type of NLTL’s can be referred to NLTL’s with spatial dispersion. The second type of NLTL’s is ensemble of nonlinear oscillators with a characteristic natural frequency and temporal dispersion. In the first case, the duration of electromagnetic pulses is determined mainly by the number of lumped nonlinear elements, e. g. , gas gap switches. Circuits for producing high-voltage bipolar pulses, as a rule, contain two high-voltage gas gap switches. In this work, we report on an experiment in which the central conductor of the coaxial line has up to N gas gap switches with a rather low interelectrode capacitance.
    Relevant experiments show that increasing the number of the gaps causes an inversely proportional decrease in spectrum width. Because the average delay time of breakdown for a gap displays a nonlinearly relation to the amplitude of the applied field, including the RF component, the central frequency in the spectrum of the pulse is a function of the amplitude of the TEM wave incident on the line. Besides gas gap switches, nonlinear capacitances or inductances can be used as the lumped elements. For example, a periodic waveguide structure with ferrite-based nonlinear inductances and capacitive cross-couplings was used in.
  9. Keywords:
  10. Periodic Structure ; Equivalent Circuits ; Discharging ; Nonlinear Transmission Line ; Maximum Frequency Optimization ; Maximum Operating Power ; High Power Microwave Pulse ; Gas Switch

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