Yang, Hao (2019). Terahertz waveguide filters. University of Birmingham. Ph.D.
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Abstract
The waveguide filters are popular choices for transmitting and attenuating signals and the construction of passive circuits. With increasing demands on terahertz systems, waveguide filters with not only excellent performances but also compact size and lightweight are in need. This thesis looks into the design of terahertz waveguide filter while taking advantage of specific micromachining process.
Two waveguide filters operating on WR-3 band (220-325 GHz), one based on high precision computer numerically controlled (CNC) milling and the other using SU-8 photoresist technology, are designed and fabricated in this work to achieve demanding specifications. It is the first demonstration with the best measured performance that a CNC milled filter with a steep rejection characteristic beyond 300 GHz and a SU-8 micromachined filter with novel cross-coupling topology working at WR-3 band. These two filters demonstrate potential replacements of frequency selective surface (FSS) filters used in heterodyne radiometers for unwanted sideband rejection.
Another two WR-3 waveguide filters based on laser micromachining are also presented in the thesis. The filter structures are specially chosen to take advantage of the laser cutting processes and the standard steps of laser micromachining are also optimised accordingly in order to reduce the fabrication errors and achieve better performances. Although the performance of the two filters is not perfect, these works show the potential of the laser micromachining for fabricating terahertz waveguide filters.
| 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 All rights reserved | |||||||||
| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Engineering, Department of Electronic, Electrical and Systems Engineering | |||||||||
| Funders: | Engineering and Physical Sciences Research Council | |||||||||
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| URI: | http://etheses.bham.ac.uk/id/eprint/9638 |
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