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 34 for “"finite difference time domain method"”.
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Analysis of periodic structures using finite-difference time-domain method
… using the 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 …
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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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A new finite-difference time-domain method applied to an open waveguide structure.
The study makes 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 …
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Interference Modelling for Indoor Wireless Systems using the Finite-Difference Time-Domain Method
… of fully-electromagnetic 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- …
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Efficient modeling of passive electronic devices using the finite-difference time domain method
… cavity resonators, 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 …
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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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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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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
… and energy resolution. 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 …
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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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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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Development of multifunctional software for evaluating the photonic properties of new dielectric composite geometries
… for solving Maxwell's equations using the finite-difference time-domain method, and was used to study 2D and 3D dielectric composites. The software was written from the ground up to be fast, extensible, and generalized for solving any finite difference problem. The code supports …
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Near-field imaging with terahertz pulses
… is experimentally and numerically studied. Finite-difference time-domain method is used to model propagation of THz pulses through the probe aperture in order to optimize the probe design. It is shown that the probe sensitivity is significantly improved if the detecting antenna measures …
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Radio propagation in fire environments.
… electromagnetic simulation technique. A modified Finite Difference Time Domain method is presented and is utilised to examine three dimensional propagation in the small scale fire experiments. The outcome is a more solid understanding of propagation and the contributing factors. The last portion …
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Passive components for dense optical integration based on high index-contrast
… approximate analysis is obtained by analytical methods such as coupled-mode theory and gaussian/ray optics. For accurate analysis and optimized design, extensive numerical simulations are performed using the Finite Difference Time Domain method. The numerical results are in good agreement with …
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Impedance effects of metallic ground plane on the CTHA antenna
… other than 1 of the CTHA. Another numerical method, XFDTD (X-window finite difference time domain method), has shown better accuracy in calculating the CTHA's impedance than NEC when comparing with the experimental results.
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Theoretical design of photonic crystal devices for integrated optical circuits
… using tapered dielectric waveguides. In time-domain simulations of photonic crystal waveguides, spurious reflections from cell edges can be eliminated by terminating the waveguide with a Bragg reflector waveguide. We demonstrate novel lasing action in two-dimensional photonic crystal …
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