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 56 for “"time domain method"”.
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Analysis of periodic structures using finite-difference time-domain method
… constant horizontal wavenumber finite-difference time-domain periodic boundary condition (FDTD/PBC). A new FDTD/PBC approach is introduced to analyze the scattering properties of general skegrid periodic structures. The approach is simple to implement and efficient in terms of both computational …
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Modeling electrically small apertures using the finite difference-time domain method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Design optimization of acoustic metamaterials and phononic crystals with a time domain method
A time-dependent adjoint approach for obtaining sensitivity derivatives for shape optimizations of acoustic metamaterials and phononic crystals is presented. The gradient-based design procedure is suitable for large numbers of design variables, and results are shown on achieving effective material …
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A new finite-difference time-domain method applied to an open waveguide structure.
… use of a variation of the Finite-Difference Time-Domain (FDTD) method as first proposed by Yee to simulate electromagnetic field distribution and propagation in an open waveguide structure. In order to prove that this new method is valid, a reflection coefficient is calculated with simulation …
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A Hybrid Spectral-Element / Finite-Element Time-Domain Method for Multiscale Electromagnetic Simulations
… study we propose a fast hybrid spectral-element time-domain (SETD) / finite-element time-domain (FETD) method for transient analysis of multiscale electromagnetic problems, where electrically fine structures with details much smaller than a typical wavelength and electrically coarse structures …
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Interference Modelling for Indoor Wireless Systems using the Finite-Difference Time-Domain Method
… techniques, such as the Finite-Difference Time- Domain (FDTD) method, limits their applicability for day-to-day system planning purposes at this stage. The research presented in this thesis describes a series of FDTD investigations of the indoor radio channel, using two- and …
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Efficient modeling of passive electronic devices using the finite-difference time domain method
… that are analyzed using the Finite Difference Time Domain (FDTD) algorithm for solving Maxwell's equations. One of the fundamental problems associated with analyzing this class of structures is that accurate modeling of their fine features typically requires a large mesh and an exorbitant …
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Efficient solution of Maxwell's equations using the nonuniform orthogonal finite difference time domain method
The Finite Difference Time Domain (FDTD) method is limited by memory requirements and computation time when applied to large problems, complicated geometries, or geometries with fine features. In this thesis, the nonuniform orthogonal FDTD method is presented and applied to a variety of …
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Finite element time domain method with a unique coupled mesh system for electromagnatics and photonics
The finite difference time domain (FDTD) method is a popular technique, being used successfully to analyse the electromagnetic properties of many structures, including a range of optical or photonic devices. This method offers several major advantages such as, a minimum level of calculation is …
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Development of the Finite Difference Time Domain Method on a Lebedev Grid for Anisotropic Materials
The finite-difference time-domain (FDTD) method is derived on a Lebedev grid, instead of the standard Yee grid, to better represent the constitutive relations in anisotropic materials. The Lebedev grid extends the Yee grid by approximating Maxwell's equations with tensor constitutive relations …
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Efficient mesh truncation techniques for the solution of Maxwell's equations using the finite-difference time domain method
The application of the Finite Difference Time Domain (FDTD) method to open region radiation problems requires the truncation of the infinite domain down to a finite-sized domain amenable to numerical simulation. The accuracy of the solution and the computational expense required to attain the …
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Modelling and analysis of complex electromagnetic problems using FDTD subgridding in hybrid computational methods. Development of hybridised Method of Moments, Finite-Difference Time-Domain method and subgridded Finite-Difference Time-Domain method for precise computation of electromagnetic interaction with arbitrarily complex geometries
… computational technique combining the frequency domain Method of Moments (MoM), Finite-Difference Time-Domain (FDTD) method and a subgridded Finite-Difference Time-Domain (SGFDTD) method. This facilitates a significant advance in the ability to predict electromagnetic absorption in inhomogeneous, …
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Part I: Improved handling of geometry details in finite difference time domain method; Part II: Method of circuit extraction using finite difference frequency domain matrix formulation with application to power bus modeling
… additional flexibility. The spatial subgridding method is based on the linear interpolation of the electric and magnetic current densities. The forward and backward coupling schemes are designed to be symmetric, which ensures the stability of the subgridding algorithm. The temporal subgridding …
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Modelo numérico de efeitos hidrodinâmicos em escoamentos internos e externos
… numerical model consists of the coupling of two methods with different nature, which were evaluated independently in a first stage. The first one is the time domain method based on the panel method and potential theory to calculate the ship dynamic in regular waves; here the formulation of ship …
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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
… Here, we develop a new finite-difference time-domain method to calculate EELS spectra and maps, which is based on a commercial software package “Lumerical”. The calculated results for different cases are compared with the well-known boundary element method (BEM) and show an excellent …
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A Finite-Difference Time-Domain Electromagnetic Solver in a Generalized Coordinate System
A new, finite-difference, time-domain method for the simulation of full-wave electromagnetic wave propogation in complex structures is developed. This method is simple and flexible; it allows for the simulation of transient wave propogation in a large class of practical structures. Boundary …
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Solving time domain scattering and radiation problems in a marching-on-in-degree technique for method of moment
<p>The time domain method of moment has been proposed for a long time. The marching-on-in-time solver suffers from late time instability, while the marching-on-in-degree technique can avoid this problem. </p> <p>This thesis introduces a new temporal basis function and a new Green's function form …
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Prediction Of Optical Properties Of Plasmonic Composites: Applications To Solar Energy Harvesting
The finite difference time domain method was used to simulate the optical response of plasmonic composites with one and two nanoscale spherical metallic inclusion(s): Ag/Cu in Air/SiO2) with various diameters and compositions. Fair agreement was found between simulation and effective medium …
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