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oai:www.ideals.illinois.edu:2142/69362 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Miller, Robert Lewis 2014-12-15T19:05:19Z 2014-12-15T19:05:19Z 10000-01-01 1987 1987 Power loss mechanisms are investigated in high-power SAW-based acoustoelectric devices on gallium arsenide. Power losses in reflective UHF SAW driving transducers often used in such devices are studied by a detailed coupled-mode model. The results of this model (which show excellent agreement with experimental data) indicate the finger resistance losses are the main problem, but that losses can be made quite low. A laser probe system, built for this work, is analyzed and used to provide much new information about unguided and guided pseudo-SAW propagation on nominally (100) cut. $$ propagating GaAs. Both measured data and analysis are provided. The feasibility of using acoustic guiding structures in high-power acoustoelectric devices is investigated, along with novel approaches to couple energy into the guides and to recirculate the acoustic power for as long as possible. Made available in DSpace on 2014-12-15T19:05:19Z (GMT). No. of bitstreams: 1 8721717.pdf: 5498854 bytes, checksum: 2ad9ddee179d8d05df159d8860769826 (MD5) Previous issue date: 1987 Embargo set by: Seth Robbins for item 69528 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 224 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1987. http://hdl.handle.net/2142/69362 (UMI)AAI8721717 Engineering, Electronics and Electrical Efficiency Considerations in Narrow-Band Gallium-Arsenide Acoustoelectric Devices text Ph.D. Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation