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Low noise X-band Oscillator Design Using Dielectric Resonator at Whispering Gallery Mode

Salmani, Siamak | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43925 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. Oscillators in microwave communication systems play very important role. Therefore, designing an oscillator with a good performance, influences the final performance of the system. One of the parameters that determine the performance of an oscillator is the phase noise. This parameter in systems that have a large number of adjacent frequency channels, is causing many problems. Therefore, designing an oscillator with low phase noise improves the entire system performance.
    Microwave oscillator phase noise is influenced by various factors, which one of the most important is the resonator. In microwave applications cavities have small sizes, thus it is difficult to use of them. Thus, in microwave frequencies, using of dielectric resonators is more usual. In dielectric resonator, whispering gallery modes is being used, to increase size more, and have a higher quality factor.
    The main focus of this thesis is on the design of a dielectric resonator at whispering gallery mode with high quality factor and then using it in oscillator circuit.
    Design and analysis of the resonator, excitation, and ultimately use it to create the right conditions for the oscillation of the oscillator circuit at X-band is considered. Also, resonator quality factor measurment is presented
  9. Keywords:
  10. Oscillators ; Whispering Gallery Mode ; Quality Factor

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