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 75 for “"Dielectric Material"”.
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Variable permittivity dielectric material loaded stepped-horn antenna
Stepped-horn antenna loaded with dielectric material of variable permittivity is proposed to improve radiation characteristics and/or to increase the electrical dimensions of the radiating structure compared to unloaded empty one. A hybrid numerical technique is used to analyze such an antenna. The …
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Electrical studies of silicon and low K dielectric material
… of defects in bulk and interface of electronic materials. Capacitance-Voltage (CV) measures the overall net carrier concentration and a built-in voltage for a diode junction. Deep level transient spectroscopy (DLTS) as one of the most sensitive electrical measurement techniques can detect …
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Use of dielectric material in muon accelerator RF cavities
… on the radius of the cavity, as well as the dielectric constant of the material within the cavity. A standard vacuum cavity with a resonant frequency of 800 MHz is too large to fit within the solenoids. This paper studies one method of avoiding this limitation by placing a dielectric material …
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Advanced Manufacturing and Dielectric Material Characterization Techniques for High-Temperature mm-Wave Antennas
… In this work, two aspects of high temperature materials in the above context are explored: (a) the development of advanced manufacturing techniques for high temperature materials that is lowcost, low-time, and low-infrastructure, and (b) the development of material characterization techniques …
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Investigation of Adhesive and Electrical Performance of Waterborne Epoxies for Interlayer Dielectric Material
… waterborne epoxy emulsion poses a concern for dielectric performance and adhesive durability. Another problem involves the crystallization of insoluble solid dicyandiamide (DICY), which is significantly different in morphology than that found in solution cast resins. A two-stage drying model …
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Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material
… for a spherical cavity within a homogeneous dielectric material has been developed using Finite Element Analysis (FEA) software in parallel with MATLAB programming code. The model has been used to study the effect of various applied stresses and cavity conditions on PD activity and also the …
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Dielectric characterization using a Wideband Dielectric Filled Cavity (WDFC)
… sample configurations used for characterizing dielectric materials over a wide band of frequencies. In the two configurations, a cylindrical cavity completely filled with a sample of the dielectric material of interest is used. The two configurations are the following: 1. The cylindrical cavity …
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Thin film BCZT in a capacitive thermo-electric converter
… The idea of using a temperature dependent dielectric to turn heat into electricity has been around for several decades but has never been feasible due to low efficiency and the practical difficulty of being able to thermally cycle the dielectric material quickly enough. However, thin film …
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Novel photonic phenomena in nanostructured material systems with applications and mid-range efficient insensitive wireless energy-transfer
… the nanoscale is provided. In the class of all-dielectric material systems, techniques for the suppression of radiative loss from incomplete-photonic-bandgap structures are developed: the cancellation of radiation channeled into discrete modes of the substrate, for resonant small-modal-volume …
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Miniaturized Antenna for Satellite Broadband Application
… without generating grating lobes. A novel dielectric material with relative permittivity of 5.7 is coated on the MEDA to significantly reduce the size of the antenna without disrupting its broadband characteristics, to make the MEDA compatible with planar array configuration. The …
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Measurement of Low Temperature Thermal Properties of Microcalorimeters Using Johnson Noise Thermometry
… interesting physics present within an amorphous dielectric material. The thermal properties of several calorimeters have been measured to understand the geometric dependence on transport phenomenon. We analyze and compare our results with observations of previous measurements, and with those …
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Photonic Crystals with Alternate Arrays of Rods and Holes in a Low Dielectric-Index Material
… waves (light beams) in periodically modulated dielectric material structures based on Maxwell’s equations. We are interested in novel light propagation characteristics in these man-made dielectric material structures for practical applications, especially on optical communications and …
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Femtosecond laser micro-machining and consequent self-assembled nano-structures in transparent materials
… micro-machining within the bulk of transparent materials. Thanks to its unique properties, the femtosecond laser writing technique offers the potential for realizing three-dimensional multi-component photonic devices, fabricated in a single step and in a variety of transparent materials. When we …
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Reactive Plasma Etching of Silicon Carbide, Silicon Carbonitride, and Titanium Nitride in a Tetrafluoroethane/Oxygen Plasma
… between the silicon substrate and the 1ow-k dielectric material. We will use silicon carbide (SiC), silicon carbonitride (SiCN), and titanium nitride (TiN) as our diffusion layer. Using the RF plasma and the magnetron gun with 1,1,1,2 tetrafluoroethane and oxygen as the active gases, we will …
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A Fourier Solution for Electromagnetic Scattering by a Covered Rectangular Cavity
… metallic surface that has been covered with a dielectric material. The transverse magnetic and transverse electric polarizations are both considered. The rectangular geometry of the embedded cavity allows for the use of a Fourier based solution. Presented here are modifications to the Fourier …
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A Finite Element Approach to Model Electromagnetic Fields Scattered by a Buried Cavity
… that has been covered with a layer or layers of dielectric material, considering both transverse electric and transverse magnetic polarizations. Due to the shape of the cavity, this problem is approached using the finite element method. This approach provides a boundary condition at the opening …
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Computational investigations of nanophotonic systems
… top half of a sphere, where the top half is a dielectric material and the bottom half is a metal, in order to determine how effective the metal is at reflecting the emission toward the top. Separately, I used the SCUFF-EM boundary element method classical electromagnetic solver to simulate …
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Liquid level measurement using a coplanar transmission line
… oscillator. The output frequency falls as a dielectric material penetrates the fringe field. An impressive sensitivity is accomplished by using very thin conductors, thereby ensuring that the fringe field energy is maximised. The most important feature of this sensor is its ability to operate …
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Performance of defected ground structure for rectangular microstrip patch antenna
… and width 46.0721 is designed on the substrate dielectric material FR-4 having dielectric constant r=4.3 and thickness 1.6 mm. The defect ground structure (DGS) has gained much attention over the last few years for its ability to increase the performance of wireless system by effectively …
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Characterizing dielectric materials with a feedback-based model
… no industry standard for separating the dielectric and conductor losses that appear in PCBs. As part of the thesis work, test vehicles composed of six different dielectric materials were fabricated with different trace widths, copper foil profiles, and oxide surface treatments. A …
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