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 21 for “"Transmission line theory"”.
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Resonances of periodic metal-dielectric structures at the infrared wavelength region
… can be used as band pass filters but the design theory and near field properties have not been known. Transmittance of thin, single-layer and multiplayer metal meshes has been investigated using Micro-Strips, yielding numerical solutions of Maxwell's equations. The near field effect was studied …
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Identification of the Impulse-Response Functions of a Non-Reflecting Monopolar Neuron and Its Parts
… cable equation to standard ("voltage") cable theory. Also, the concepts of characteristic impedance, Z$\sb0$, and propagation factor, $\gamma$, of transmission line theory were instrumental in determining the propagation of both current and voltage signals, including those of their …
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Distributed parameter RC network analysis
… are considered. Analogies between two-wire transmission line theory and multilayer distributed network theory are developed, i.e., standing wave and traveling wave concepts. An accurate computer-aided steady state analysis procedure is presented which has a solution accuracy that can be …
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Theory and Applications of Multiconductor Transmission Line Analysis for Shielded Sievenpiper and Related Structures
… exhibit dual-mode propagation bands. Initially, transmission line models are focused on. Transmission line models of periodic structures have been used extensively in a wide variety of applications due to their simplicity and the ease with which one can physically interpret the resulting wave …
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Modeling superconductors using surface impedance techniques
… of conductivity for superconductors to classical transmission line theory. When the tool is used with the Zimmermann formulation, it can model the behavior of superconductors with arbitrary purity, including very clean superconductors, which cannot be handled correctly by the Mattis Bardeen …
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Wideband rotary transformer for VHF use
The theory of static wideband transformers has been applied to the design of a VHF rotary coupler that has a bandwidth ratio of 1000:1, and that requires no physical contact between the stator and rotor. A combination of balanced and unbalanced transmission line theory has been used to predict the …
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Integral Equation Methodologies for the Signal Integrity Analysis of PCB and Interconnect Structures in Layered Media From DC to Multi-Ghz Frequencies
… that cannot be quantified accurately using transmission line theory. To date, the development of electrodynamic integral equation solvers that can handle realistic interconnect and printed circuit board structures has been hindered by the large number of unknowns in the discrete model. While …
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Electrical Diagnostics for Nanosecond Pulsed Discharge Reactors
This thesis provides an introduction to transmission line theory (telegrapher’s equations) as the mathematical background needed to correctly perform and interpret electrical measurements in nanosecond pulsed discharge reactors. The mathematical framework is implemented in a numerical tool called …
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Electromagnetic modeling of hot-wire detonators using analytical and numerical methods with comparison to experiment
… which is then used to model detonators using transmission line theory. The theoretical analysis treats the detonator as a cascaded transmission line incorporating several different dielectrics, and examines both differential and common mode excitation for a generic detonator model. This 1-D …
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Integrated EMI Filters for Switch Mode Power Supplies
… losses. Using the multi-conductor lossy transmission-line theory, a new frequency domain model of integrated LC structure is developed and verified by experimental results. Through detailed electromagnetic analysis, the equations to calculate the required model parameters are derived. …
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Model-Based Identification of POTS Local Loops for DSL Connectivity Prediction
Accurate prediction of the Digital Subscriber Line (DSL) access rate - over an existing plain old telephone service (POTS) twisted pair local loop - is vital to DSL providers. We have approached the challenge as an identification problem of the local loop structure and its twisted pair parameters, …
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Superdirectivity and the Application of Complementary Split Ring Resonators in Directivity Enhancement of Millimeter-Wave Antennas
… mode analysis, small dipole modeling, and transmission line theory for a time efficient design process. Additionally, to overcome matching the high input impedance and improve the directivity bandwidth, a Yagi-like array implementation is developed and verified experimentally. To introduce …
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Electric field emissions of FPGA chip based on gigahertz transverse electromagnetic cell modeling and measurements
… of the overall GTEM cell performance using transmission line theory. An FPGA chip was adopted as the IC under test because of its flexibility in configuration to any digital circuit. The investigations discovered that the impact of the FPGA board supporting components and interconnection …
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Design and Optimization of Nanoplasmonic Waveguide Devices
… the device, while the coarse model is based on transmission line theory. We demonstrate that, when the iterative space mapping algorithm is used, it converges fast to a design which meets all the specifications. In addition, full-wave FDFD simulations of only a few candidate structures are …
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Macro Basis Functions for Wire and Cable Coupling Analysis
… solution space by forming a new basis through linear combinations of the underlying lower-order basis functions (LBFs). Conventionally, wires are modelled in the MoM with circumferentially-invariant axially-directed tubular rooftop basis functions where no higher order variations are …
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Novel narrowband microstrip filters for wireless communications systems
… methods for these resonators includes a transmission-line theory, ABCD matrix, and EM simulation based on method of moments. The measured results are used to validate the performance of the devices developed and show good agreement with the theory and simulation results. The various …
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An investigation of the microwave upset of avionic circuitry
… examination of a coupling model based on transmission line theory. A study is then presented of circuit technology developments, electronic component interference and damage mechanisms, and evidence of upset of electronic equipment is given. Investigations show that there is more 1-18 GHz …
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Detection of Anomalies In Drilled Shafts Using theImpedance Log Method
<p>The impulse response method is a nondestructive technique used to check the length and continuity of deep foundations. Uncertainty may exist when interpreting the results to quantify the size and location of an anomaly, if present. The analysis can be enhanced by developing a two-dimensional …
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Novel metamaterial frequency discriminating devices for next generation wireless communication systems
… of these microstrip devices involved the use of transmission-line theory and EM simulation tools which were based on the method of moments and finite element analyses. Measured results were used to validate the predicted behavior and performance of these devices. In fact there was good agreement …
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Integrated Frequency-Selective Conduction Transmission-Line EMI Filter
The multi-conductor lossy transmission-line model and finite element simulation tool are used to analyze the high-frequency attenuator and the DM transmission-line EMI filter. The insertion gain, transfer gain, current distribution, and input impedance of the filter under a nominal design are …
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