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 29 for “"Wave simulation"”.
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Ocean Wave Simulation and Prediction
… techniques (e.g. satellite, undersea fiber, microwave communication) have been used in marine communication, they are either too expensive with very small bandwidth, or too limited in its coverage range. We propose to develop a marine wireless mesh network which is formed by low cost buoyed …
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Dynamic Wave Simulation of Unsteady Open Channel and Surcharge Flows in Sewer Networks (saint-Venant Equations, Four-Point Implicit Finite Difference, Storm Sewer Drainage, Urban Hydrology)
… sewer there exist two techniques of mathematical simulation. One is the standard technique which separates surcharge flow from open-channel flow and represents them mathematically by using two different sets of equations. The other is the Preissmann slot technique which simulates surcharge flow as …
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The radiation physics, mitigation approaches and design guidelines of high-speed connectors and cables analyzed with numerical modeling, analytical formulation and measurements
… connectors and cables analyzed with full wave simulation, numerical modeling, analytical formulation and measurements.</p><p>In the first paper, the radiation from the optical cage connector in the frequency range of 4-28 GHz is analyzed with validated full-wave simulation model and …
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Microwave Lens Designs: Optimization, Fast Simulation Algorithms, and 360-Degree Scanning Techniques
Microwave lenses support low-phase error, wideband, wide-angle scanning, and true-time delay (TTD) beam forming. They provide ideal performance for applications such as satellites, remote-piloted vehicles, collision-avoidance radars and ultra-wideband communications systems. The emerging printed …
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Design of Microwave Front-End Narrowband Filter and Limiter Components
… intentional and unintentional high-power microwave (HPM) sources. This is of interest because many commercial microwave communications and sensor systems are unprotected from high power levels. Novel technologies to harden front-end components must maintain existing system performance and cost. …
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Ανάλυση και Σχεδίαση Ελικοειδούς Κεραίας Κανονικού Τρόπου Λειτουργίας μέσω Ισοδύναμων Κυκλωμάτων και Ηλεκτρομαγνητικής Προσομοίωσης
… απαιτείται πλήρης κυματική προσομοίωση (full-wave simulation) στο λογισμικό CST Studio Suite, η αποφυγή χρήσης σύνθετων ελικοειδών γεωμετριών περιορίζει σημαντικά τους απαιτούμενους υπολογιστικούς πόρους. Για την επαλήθευση της ακρίβειας των μοντέλων, τα αποτελέσματά τους συγκρίνονται με …
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Modal based BGA modeling in high-speed package
… smooth and rough conductors is validated using simulations. Error sensitivity analysis is performed to demonstrate the potential errors in the original "Root-Omega" procedure and the error sensitivity is significantly reduced by the proposed improvements.</p><p>In the Section 2, a fast …
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Modeling strategies for estimating and suppressing electromagnetic interference and improving power integrity
… method which provide options for circuit-level simulations as well as analytic estimation of inductance. The circuit solution matches results from the full-wave simulation model within 9% for the 8-terminal capacitor and within 15% the for the 2-terminal capacitor.</p> <p>System-level radiated …
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Analysis of Periodic and Random Capacitively-Loaded Loop (CLL) Metamaterial Structures for Antenna Enhancement Applications
… index, by exploiting features in arrays of sub-wavelength unit inclusions. These unconventional electromagnetic properties are realized through the coupling of the microscopic unit inclusions, which govern the macroscopic properties of the structure. After demonstrating that a periodic array of …
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Characterization and modeling of ESD events and near-field scanning calibration structures
… for secondary ESD discharges. The measured waveforms are analyzed with respect to waveform parameters, such as the vertical threshold of the rising edge, the derivative of the current waveform, and total charge delivered. These parameters enable automatic detection of secondary ESD while …
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex …
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Simulation of Simultaneously Negative Medium Metamaterials
… and named by those who work in the microwave material area. According to existing documentation, the metamaterials have relative permittivity and/or relative permeability of values less than 1, including negative values. If the material has negative permittivity and permeability at the …
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Study of Field Enhancement by Spherical Voids in Gold Lattices by Using Three Dimensional Finite Difference Time Domain Simulations
… have the ability to concentrate light in subwavelength dimensions resulting in a significant increase in the intensity of the light (field enhancement) near the metal surface. Field enhancement properties of nanostructured metals can significantly enhance efficiency of an upconverter used in …
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Tsunami Excitation Estimation from Real-time GNSS
… generated with the GeoClaw shallow-water wave simulation software and maps seismic slip along each section of the fault to points located off the Cascadia coast in 20m of water depth and relies on the principle of the linearity in tsunami wave propagation. The system draws continuous slip …
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Inline microring reflector for photonic applications
… In this dissertation, we study analysis and simulations of a compact microring based reflector assembled by forming a Bragg grating into a loop. With the appropriate design, the microring resonance can precisely align with the reflection peak of the grating while all other peaks are …
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Full-wave modeling of lower hybrid waves on Alcator C-Mod
… on several aspects of the Lower Hybrid (LH) wave physics, the common theme being the development of full-wave simulation codes based on Finite Element Methods (FEM) used in support of experiments carried out on the Alcator C-Mod tokamak. In particular, two non-linear problems have been …
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Modeling & Development of Wirelessly Coupled Loops for Chip-to-Antenna Communications
… signals between passive elements on microwave laminates and integrated circuits; replacing traditional interconnect methods such as wire bonds and solder bumps which require costly back end of line processing. The loops harness both electric and magnetic fields in order to create the …
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Effective modeling of advanced filters and multiplexing networks
Microwave filters and multiplexers are widely used in all types of electronic systems. This research focuses on advanced filters and multiplexers for applications in communication satellites with stringent requirements and specifications. Conventional modeling techniques are typically either based …
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Gap Waveguide Array Element Filters
… Control of spectral emissions in integrated mm-wave systems has so far been neglected due to the limited amount of devices operating at the frequency range. Gap waveguides are a type of waveguide implemented in a periodic metamaterial that offer several critical advantages over standard …
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex …
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