Matches in SemOpenAlex for { <https://semopenalex.org/work/W259577279> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W259577279 abstract "This thesis describes the Heterostructure Barrier Varactor (HBV) and its application in frequency multipliers. Different HBV materials, fabrication processes, and device models are presented. The aim of this work is to improve the efficiency of HBV frequency multipliers. Efficiency limitations of symmetric varactor frequency multipliers are investigated. Simple varactor models with capacitance-voltage characteristics of varying shapes have been analyzed. Calculations show that the conversion efficiency is improved for a C(V)-shape with large non-linearity at zero-volt bias. For quintuplers, the optimal embedding impedance at the third harmonic is an inductance in reso-nance with the varactor capacitance. Results are presented from frequency tripler measurements with planar GaAs/AlGaAs HBVs. Simulations and cooled measurements show that self-heating yields excessive conduction current that decreases the efficiency. A new design of planar HBVs has been tested with improved thermal conductance and reduced series resistance. A maximum output power of 4 mW was generated at 246 GHz with an efficiency of 4.8%. A new fabrication process is presented in which HBVs are fabricated on a copper substrate. This process offers reduced parasitic losses and improved thermal conductivity and is carried out without degrading the electrical characteristics. In a frequency tripler experiment, a maximum output power of 7.1 mW was generated at 221 GHz with a flange-to-flange efficiency of 7.9%. A quasi-optical HBV tripler is presented. 11.5 mW was generated at 141 GHz with a maximum efficiency of 8%. A non-linear transmission line frequency tripler, consisting of a finline loaded with 15 HBVs, is presented. A maximum output power of 10 mW was generated at 130.5 GHz with an efficiency of 7%, and the 3 dB bandwidth was measured to 10%. A simple design method for the calculation of optimum embedding impedances, maximum efficiency, and pump power for HBV triplers is presented." @default.
- W259577279 created "2016-06-24" @default.
- W259577279 creator A5041903014 @default.
- W259577279 date "2000-01-01" @default.
- W259577279 modified "2023-09-26" @default.
- W259577279 title "Heterostructure Barrier Varactors for High Efficiency Frequency Multipliers" @default.
- W259577279 hasPublicationYear "2000" @default.
- W259577279 type Work @default.
- W259577279 sameAs 259577279 @default.
- W259577279 citedByCount "1" @default.
- W259577279 crossrefType "dissertation" @default.
- W259577279 hasAuthorship W259577279A5041903014 @default.
- W259577279 hasConcept C119599485 @default.
- W259577279 hasConcept C121332964 @default.
- W259577279 hasConcept C127413603 @default.
- W259577279 hasConcept C14485415 @default.
- W259577279 hasConcept C146002875 @default.
- W259577279 hasConcept C15485314 @default.
- W259577279 hasConcept C165801399 @default.
- W259577279 hasConcept C17525397 @default.
- W259577279 hasConcept C192562407 @default.
- W259577279 hasConcept C206991015 @default.
- W259577279 hasConcept C24326235 @default.
- W259577279 hasConcept C29210110 @default.
- W259577279 hasConcept C30066665 @default.
- W259577279 hasConcept C46362747 @default.
- W259577279 hasConcept C49040817 @default.
- W259577279 hasConcept C62520636 @default.
- W259577279 hasConceptScore W259577279C119599485 @default.
- W259577279 hasConceptScore W259577279C121332964 @default.
- W259577279 hasConceptScore W259577279C127413603 @default.
- W259577279 hasConceptScore W259577279C14485415 @default.
- W259577279 hasConceptScore W259577279C146002875 @default.
- W259577279 hasConceptScore W259577279C15485314 @default.
- W259577279 hasConceptScore W259577279C165801399 @default.
- W259577279 hasConceptScore W259577279C17525397 @default.
- W259577279 hasConceptScore W259577279C192562407 @default.
- W259577279 hasConceptScore W259577279C206991015 @default.
- W259577279 hasConceptScore W259577279C24326235 @default.
- W259577279 hasConceptScore W259577279C29210110 @default.
- W259577279 hasConceptScore W259577279C30066665 @default.
- W259577279 hasConceptScore W259577279C46362747 @default.
- W259577279 hasConceptScore W259577279C49040817 @default.
- W259577279 hasConceptScore W259577279C62520636 @default.
- W259577279 hasLocation W2595772791 @default.
- W259577279 hasOpenAccess W259577279 @default.
- W259577279 hasPrimaryLocation W2595772791 @default.
- W259577279 hasRelatedWork W1479789153 @default.
- W259577279 hasRelatedWork W1932691762 @default.
- W259577279 hasRelatedWork W1989681220 @default.
- W259577279 hasRelatedWork W2037157684 @default.
- W259577279 hasRelatedWork W2067692453 @default.
- W259577279 hasRelatedWork W2101670927 @default.
- W259577279 hasRelatedWork W2135217098 @default.
- W259577279 hasRelatedWork W2143890617 @default.
- W259577279 hasRelatedWork W2148102779 @default.
- W259577279 hasRelatedWork W2153311247 @default.
- W259577279 hasRelatedWork W2154737989 @default.
- W259577279 hasRelatedWork W2188145278 @default.
- W259577279 hasRelatedWork W2364973633 @default.
- W259577279 hasRelatedWork W2478158157 @default.
- W259577279 hasRelatedWork W2782682336 @default.
- W259577279 hasRelatedWork W3047350151 @default.
- W259577279 hasRelatedWork W3114803727 @default.
- W259577279 hasRelatedWork W349246349 @default.
- W259577279 hasRelatedWork W1756812869 @default.
- W259577279 hasRelatedWork W2094171252 @default.
- W259577279 isParatext "false" @default.
- W259577279 isRetracted "false" @default.
- W259577279 magId "259577279" @default.
- W259577279 workType "dissertation" @default.