Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"Thick Film"”.
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Electrical characterization of thick film superconductors
… used successfully, they must be characterized. Film quality was characterized by measuring the electrical properties under different conditions. Films were tested on alumina and magnesia substrates, to characterize the substrate interactions. Films were printed in different thicknesses and …
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Wideband characterization of thick film inductors
… time domain techniques to characterize and model thick film inductor structures. The method is a time domain reflection (TOR) measurement which measures the input port's reflection transfer function of the component under test. The reflection from a short circuit is acquired as the reference …
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Degradation mechanisms of barium titanate based thick film capacitors
… of high K (≅ 500) barium titanate based thick film capacitors were studied. It was found that a gold conductor made from Au metallo-organic paste is not compatible with the porous high K dielectric material. The leakage current of a thick film capacitor made from Ag/Pd thick film …
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Biomedical sensor for transcutaneous oxygen measurements using thick film technology
… gas measurement was investigated, employing thick film technology, which is an excellent technique to produce sensors in bulk, as it is cost effective and easy for reproducible fabrication.<br/>This thesis describes the application of thick film technology to the investigation and production …
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Thick film Y₁Ba₂Cu₃Ox on buffered ceramic substrates
… an insulator. The researcher has developed a thick film system that allows the production of high quality HTS films on reactive substrates, such as alumina (Al203). This system utilizes a thick film buffer layer of pure silver in combination with thick film superconductors composed of …
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A Plastic-Based Thick-Film Li-Ion Microbattery for Autonomous Microsensors
… the development of a high-power, plastic-based, thick-film lithium-ion microbattery for use in a hybrid micropower system for autonomous microsensors. A composite porous electrode structure and a liquid state electrolyte were implemented in the microbatteries to achieve the high power capability …
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A study of copper thick film conductor adhesion mechanisms on ceramic substrates
In this study, copper thick film adhesion mechanisms and its failure modes on different ceramic substrates (glass ceramic, $\rm Al\sb2O\sb3$ and AlN) were investigated as a function of aging time at 150$\sp\circ$C in the presence of Pb/Sn solders. The copper thick film inks were formulated from …
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Study of Modulation and Error Control Coding in Thick Film Digital Magnetic Recording
This thesis is concerned with the application of Modulation and Error Correction codes to Digitally Recorded Magnetic Data.<br/><br/>The effects of these coding schemes were measured against bitshift errors which are induced by different Non Clockloss Error Mechanisms. These Error mechanisms are …
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Formulation, development, and characterization of magnetic pastes and epoxies for thick film inductors
… In RF and power hybrids electronic circuitry. Thick film inductors have been subject of extensive research in recent years because they significantly reduce the weight and size, and increase the frequency of operation of electronic circuits. The research work in this dissertation is aimed at …
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Design, fabrication and application of a dedicated thick-film hybrid time domain reflectometer
… design process for developing a dedicated hybrid thick-film time domain reflectometer. The design process allows for variation of the pulse generator characteristics as well as the output impedance of the unit. The unit is fabricated using standard thick-film hybrid techniques while giving …
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A control system for laser trimming thick film resistors and the reliability effects
Since the development of thick film hybrid microelectronic processing, there has been a need for methods to adjust for tighter tolerances for electrical components through a trimming process. Components/elements, as produced, show a tolerance of the order of ±10% due to the variability of the …
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Design, fabrication and characterisation of free-standing thick-film piezoelectric cantilevers for energy harvesting
… platform. In this research, a three dimensional thick-film structure in the form of a free-standing cantilever incorporated with piezoelectric materials is proposed. The advantages of this structure include minimising the movement constraints on the piezoelectric, thereby maximising the …
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Wideband characterization of aluminum nitride substrates and high power-high frequency thick film applications
Ceramic substrates play an important role in thick film hybrid microelectronic circuits. Existing substrates such as alumina and beryllia do not meet satisfactorily the desired requirements. The newly developed aluminum nitride (<i>AIN</i>) substrate shows a great deal of promise and potentially …
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The Role of residual stresses in ceramic substrate materials for hybrid thick film applications
… as well as metallization of wideband coplanar thick film probes. The probes are also tested for electrical performance using Time Domain Reflectometry (TDR) technique. This thesis presents results that indicate that significant tensile residual stresses were generated on the back of the …
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A study of high-K dielectric materials in conjunction with a multilayer thick-film system
… materials has been studied, individually as thick-film capacitors and as buried components incorporated in second-order lowpass and bandpass RC active filter circuits. The materials were electrically characterized in terms of the variation of dielectric constant and dissipation factor with …
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A direct-write thick-film lithography process for multi-parameter control of tooling in continuous roll-to-roll microcontact printing
… sizes, difficulty in achieving uniform stamp thickness, and inability to monitor the contact region, pose challenges in scaling up [mu]CP to R2R processing. This work examines a new technique to produce seamless cylindrical tools for soft lithography using laser-based maskless lithography for …
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Low-firing Pb(Mg[subscript 1/3]Nb[subscript 2/3])O₃ - PbTiO₃ - Pb₅Ge₂SiO₁₁ compositions for thick-film capacitor applications
Includes bibliographical references (pages 91-94).
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Switchmode Power Supply Miniaturization with Emphasis on Integrated Passive Components on Prefired High Performance Ceramic Substrates
… characterization, are examined in this work. Thick film passive components (capacitors and resistors) on AlN have been developed. Also, guidelines for the design implementation and steps necessary to integrate these passive components on prefired alumina (Al2O3) and aluminum nitride (AlN) …
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Computer Aided Design and Fabrication of Magnetic Composite Multilayer Inductors
… examine the effects of constructing multilayered thick film inductors using an artificially modulated magnetic composite structure. It was found that selectively introducing regions of low permeability material increased both the inductance and the current carrying capacity compared to thick film …
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Development of a reusuable atomic oxygen sensor using oxide thick films
The aim of this project was to develop a thick film sensor made of zinc oxide that would accurately respond to various fluxes of atomic oxygen (AO), allowing it to be regenerated after saturation. The sensors were manufactured using a thick film technique of screen printing over a substrate …
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