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Qian, Lu 
ORCID: https://orcid.org/0000-0001-6863-0445
(2024).
Microwave filters based on advanced manufacture techniques towards high-power applications.
University of Birmingham.
Ph.D.
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Qian2024PhD.pdf
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Abstract
This PhD thesis focuses on the application of advanced manufacturing techniques in high-power microwave filters. Additive manufacturing (AM) technology and novel materials are combined to address the issue of thermally-induced frequency detuning among high-power microwave components. Several innovative resonator structures and filter topologies are proposed. The main contributions of the thesis are: (1) A narrowband 3D-printed Invar spherical dual-mode channel filter with enhanced thermal stability is demonstrated. An alternative end-to-end fabrication route for all-Invar high-power microwave components is established to overcome the complex manufacturability issues associated with Invar alloy. (2) 3D printing technology is combined with several novel materials to expand design possibilities for high-power microwave components in terms of RF, mechanical, and thermal properties. Multiphysics analysis and detailed evaluations of high-power behaviour are conducted for the designed microwave filters. (3) A 3D-printed monolithic wideband waveguide filter based on a novel pole-generating resonant iris structure is proposed. The flexibility of AM processes is leveraged to manufacture the resonant iris structure, enabling a more compact filter configuration and wider bandwidth. (4) A spherical high-Q resonator is demonstrated, for the first time, based on carbon-fibre-reinforced silicon carbide ceramic composite (HB-Cesic®). The resonator achieves a quality factor of over 10,000 at X-band, and the measured thermal stability is comparable to that of all-Invar components, while its weight is similar to common aluminum components. (5) A 3D-printed monolithic dielectric waveguide filter is presented. The lithography-based ceramic manufacturing (LCM) technique is employed to facilitate the fabrication of the monolithic dielectric filter. Compared to conventional fabrication methods, the need for special moulds is eliminated, and higher design freedom is achieved. Detailed manufacturing parameters and post-processing methods are introduced.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
| Supervisor(s): |
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Engineering, Department of Electronic, Electrical and Systems Engineering | |||||||||
| Funders: | Other | |||||||||
| Other Funders: | School of Engineering Scholarship | |||||||||
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/14973 |
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