Graduate Thesis Or Dissertation
 

Time domain modeling of electromagnetic radiation with application to ultrafast electronic and wireless communication

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z603r062k

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  • A versatile computational technique for improved time domain modeling of electromagnetic radiative systems is demonstrated. Two computational methods are combined: the finite-difference time domain (FDTD) method, a full-wave electromagnetic field solver, and the Kirchhoff surface integral formulation, a spatial transformation technique. The combined FDTD/Kirchhoff technique is shown to increase accuracy and efficiency in the analysis of a wide variety of electronic systems. Two approaches to the implementation of the Kirchhoff surface integral formulation are discussed, using exact expressions and using the FDTD method for the generation of the components of the integral. Several examples are presented which validate the technique and illustrate the roles of the various components. Utilizing the combined FDTD/Kirchhoff technique, improved modeling of radiative systems is presented in two applications. The first involves characterization of broadband non-time-harmonic radiation from an ultrafast electronic system. Increased accuracy in the representation of the far-field radiation arising from a photoconducting structure is demonstrated by inclusion of inhomogeneous material parameters such as the substrate and metal electrodes. By comparison of results with those from the FDTD/Kirchhoff method, a simple technique is developed for obtaining the far-field radiation by considering the edges of the substrate as secondary diffracting sources. In the second application, the accuracy of a commonly used propagation modeling technique, the ray-tracing method, is investigated as the size of local scatterers approaches the wavelength of operation. By comparison with results from the FDTD/Kirchhoff technique, the accuracy of the ray-tracing method for scatterer sizes down to a fraction of a wavelength is demonstrated. Additionally, the FDTD/Kirchhoff technique is used in developing improvement terms for a set of heuristically derived diffraction coefficients, the Luebbers' coefficients, that are frequently used in the ray-tracing method. The thesis ends with an examination of the applicability of the FDTD/Kirchhoff method to various simulation scenarios. The use of this technique as a standard to assist in the assessment, improvement, and development of more computationally efficient methods is discussed, and recommendations for future work are given.
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