Deshpande, Pratik (2015) Ultra Low Noise Microwave Dielectric Oscillators at 3.8GHz and 10GHz and High Q Tunable Bragg Resonators. PhD thesis, University of York.
Abstract
The thesis is divided into three parts. The first part of the thesis describes the design and development of two prototypes of an ultra-low phase noise 3.8GHz dielectric resonator oscillator. The first prototype included vibration measurements with a reasonable phase noise measurements developed for Selex-ES. The phase noise for the first 3.8GHz oscillator is -117 dBc/Hz at 1kHz offset and -150 dBc/Hz at 10kHz offset. The second prototype was the improved modular yet compact oscillator was then developed which demonstrated a significantly improved phase noise performance of -125.6 dBc/Hz at 1kHz offset and -153 dBc/Hz at 10kHz offset which is the lowest noise reported in the literature in this frequency band using a ceramic dielectric resonator. In the second part of the thesis, a design and measurement of a high Q broad tuning aperiodic Bragg resonator operating at 10GHz is described. The resonator utilises an aperiodic arrangement of non (λg/4) low loss alumina plates (ℰr=9.75, loss tangent of ~1 to 2 ×10-5) mounted in a cylindrical metal waveguide. The insertion loss, S21, varied from -3.9 dB to -6.4 dB while the unloaded Q varies from 81,650 to 61,020 over the tuning range of 100MHz (1%). In the third part of the thesis, simulation, design and measurement of a low noise Bragg resonator oscillator operating at 10GHz is presented. The oscillators demonstrated a phase noise of -153 dBc/Hz at 10kHz offset and -123 dBc/Hz at 1kHz offset for an unloaded Q of 190,000. To achieve these results extensive optimization of different transistors with different power level and noise figure has taken place.
Metadata
Supervisors: | Everard, Jeremy |
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Awarding institution: | University of York |
Academic Units: | The University of York > School of Physics, Engineering and Technology (York) |
Academic unit: | Electronics |
Identification Number/EthosID: | uk.bl.ethos.685249 |
Depositing User: | Mr Pratik Deshpande |
Date Deposited: | 17 May 2016 10:40 |
Last Modified: | 21 Mar 2024 14:48 |
Open Archives Initiative ID (OAI ID): | oai:etheses.whiterose.ac.uk:12990 |
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