A procedure is developed for determining the complex propagation constants and associated complex electromagnetic fields as a function of frequency for electromagnetic waves propagating along an inhomogeneous waveguide composed of dissipative materials and having a complicated shape. The wave equation, which is complex because of the presence of dissipative materials, is transformed for computer solution into a matrix eigenvalue equation by the application of the Rayleigh-Ritz variational method in conjunction with the finite-element method. The results are reviewed for several simple dissipative waveguides for which analytical results are computed for comparison. A novel proposal is then investigated in which a railroad track acts as a surface waveguide for a rapid-transit collision-avoidance system. The results illustrate the usefulness of the numerical method developed and suggest that the modified steering rail warrants further investigation for rapid-transit systems.


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    Title :

    Variational finite-element solution for dissipative waveguides and transportation application


    Additional title:

    Loesung der Variationsrechnung nach der Methode der endlichen Elemente fuer die Anwendung in verlustbehafteten Hohlleitern und bei Transportwegen


    Contributors:


    Publication date :

    1977


    Size :

    11 Seiten, 10 Bilder, 1 Tabelle, 28 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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