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Propagacao e Radiacao em Estruturas Bianisotropicas Planares

By Antonio Luis Campos da Silva Topa

Abstract

This thesis addresses the problem of the electromagnetic wave propagation and radiation trough step discontinuities in open bianisotropic planar structures. However, only the special cases of anisotropic media (e.g., uniaxial) and magneto-electric media (e.g., chiral and pseudochiral) are considered in the analysis. The structure under consideration is analyzed by means of a rigorous method, where the unbounded radiation modes are taken into account to the surface guided modes. Moreover, the least-squares boundary residual method, which is known to be a convergent method, is used as a discrete mode matching technique. The spectral amplitude of the radiation modes is expanded in a complete set of orthogonal functions and the accuracy of the solution is checked by a power balance criterion. Using a linear-operator formalism, (bi)orthogonality relations for the surface and radiation modes of several bianisotropic planar waveguides, are derived. These relations are used in order to settle a complete spectral representation for the electromagnetic field in the plane of the discontinuity. Moreover, a systematic analysis of the radiation modes in chiral and pseudochiral planar waveguides is presented in this work. For each one of this cases, a complete set of mutual orthogonal radiation modes is derived and a clear physical interpretation is achieved. Therefore, the radiation pattern of the step is analyzed along with the reflection and transmission characteristics of the discontinuity. Namely, the effects of the anisotropy and chirality on the radiated power and on the shape of the radiation pattern are investigated. Finally, it is shown that leaky modes may propagate in certain types of planner chiral waveguides suitable for integrated optics. Moreover, a new type of pseudochiral waveguide is proposed for the millimeter-wave regime: the pseudochiral nonradiative dielectric waveguide - #OMEGA#-NRD-guideAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Topics: 09J - Information theory, coding theory, signal processing, INTEGRATED OPTICS AND MILLIMETER WAVES, OPEN BIANISOTROPIC PLANAR WAVEGUIDES, ANISOTROPIC MEDIA, CHIRAL AND PSEUDOCHIRAL MEDIA, COMPLETE SPECTRAL REPRESENTATION, CONTINUOUS SPECTRUM OF THE RADIATION MODES, STEP DISCONTINUITIES, LEAST-SQUARES BOUNDARY RESIDUAL METHOD
Year: 1997
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Provided by: OpenGrey Repository
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