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Design and Implementation of a Low-noise X-band Microwave DRO using Interferometric Method

Azizkhani, Erfan | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56497 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. Microwave and millimeter wave engineering are now crucial to modern life. This field has developed as a result of its applications in non-destructive testing, communications, radars, imaging, and medicine. Oscillators generate the reference frequency in all of these applications, therefore utilizing an appropriate oscillator may have a significant influence on the performance and even the additional expenses of a microwave system. Phase noise is an example of an oscillator’s characteristic that is especially crucial. This characteristic results in a number of limitations in the system’s final performance. For instance, the phase noise of the local oscillator will be one of the causes of interference between channels and interference between symbols
    in telecommunication applications with multiple channels or a system with a high density of symbols in its constellation. The system’s dynamic range is additionally constrained by phase noise. Therefore, in order to enhance the overall performance of various systems, it is crucial to make an effort to eliminate phase noise. In fact, lowering the phase noise of a transceiver system’s local oscillators is one method to enhance the performance of all communications transceiver systems. Dielectric resonator oscillators are common oscillators that have lower dimensions than other oscillators, in addition to having low phase noise. It is possible to lock these oscillators to reliable low-frequency references. Therefore, it is crucial to reduce these oscillators’ phase noise. An oscillator’s phase noise can be increased by a number of causes, all of which have different sources. The oscillator’s phase noise is improved by reducing the contribution of each of these factors. However, the interferometric method estimates the oscillator phase noise in order to reduce the measured phase noise. As a result, this method gets rid of phase noise regardless of where the noise came from. In this thesis, an X-band DRO is implemented with phase noise of -106.3dBc/Hz at a distance of 10kHz from the carrier, and subsequently the phase noise at this distance is improved up to 12dB with the aid of the interferometric method.
  9. Keywords:
  10. Phase Noise ; Interferometery ; Dielectric Resonator Oscillator ; Millimeter Wave ; X Band Low Phase Noise Oscillator

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