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A Study Of Digital Rf Phase Shifters Fabricated With Additive Manufacturing, Yaniel Vega
A Study Of Digital Rf Phase Shifters Fabricated With Additive Manufacturing, Yaniel Vega
USF Tampa Graduate Theses and Dissertations
Digital RF phase shifters fabricated using additive manufacturing processes are presented and studied. The purpose is to explain the performance differences between phase shifters fabricated using additive manufacturing and those fabricated with conventional subtractive techniques. All phase shifters are designed to operate at a center frequency of 2.45 GHz with a 100 MHz bandwidth. The 1-bit 45° switched line phase shifters have an average insertion loss of 1.3 dB and a 220 mm2 footprint, while the 1-bit 180° high-pass low-pass phase shifters have an insertion loss 1.56 dB and a 180 mm2 footprint. The 4-bit high-pass low-pass, switched …
A Study Of Direct Digital Manufactured Rf/Microwave Packaging, John W.I. Stratton
A Study Of Direct Digital Manufactured Rf/Microwave Packaging, John W.I. Stratton
USF Tampa Graduate Theses and Dissertations
Various facets of direct digital manufactured (DDM) microwave packages are studied. The rippled surface inherent in fused deposition modeling (FDM) fabricated geometries is modeled in Ansoft HFSS, and its effect on the performance of microstrip transmission lines is assessed via simulation and measurement. The thermal response of DDM microstrip transmission lines is analyzed over a range of RF input powers, and linearity is confirmed over that range.
Two IC packages are embedded into DDM printed circuit boards, and their performance is analyzed. The first is a low power RF switch, and the second is an RF front end device that …
An Experimental Study On Passive Dynamic Walking, Philip Andrew Hatzitheodorou
An Experimental Study On Passive Dynamic Walking, Philip Andrew Hatzitheodorou
USF Tampa Graduate Theses and Dissertations
In this study, a previously designed passive dynamic walker (PDW) is built out of aluminum and plastic. The aim of the study was to produce an asymmetrical PDW and to compare the results to a computer simulation to validate the mathematical model. It also aimed at identifying the limitations of using additive manufacturing to create components for a PDW as well as gain insights on asymmetric systems.
Beginning with a five mass kneed model, parameters were varied to produce up to a nine mass kneed model solution. The nine mass model allows more variability in added mass locations and separates …