PERTURBATION ANALYSIS OF AXIALLY DEPENDENT ELECTROMAGNETIC STRUCTURES.
COLUMBIA UNIV NEW YORK DEPT OF ELECTRICAL ENGINEERING
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The previously developed iterative perturbation analysis, using nonlinear phase progression, for dealing with axially dependent perturbations on an otherwise axially uniform structure is applied to general electromagnetic propagation problems. Maxwells Equations for linear, time invariant media having arbitrary inhomogeneities and anisotropies are shown to be in proper form for application of the perturbation technique. The theory is applied to scattering from dielectric obstructions partially filling a waveguide. The shape and permittivity of an inhomogeneous tapered section are optimized together to achieve minimum reflection for a given phase shift through the dielectric material. Applications of the perturbation technique to the calculation of radiation from parasitic arrays excited by surface waves are discussed. Such problems have been previously solved by utilizing the phase progression of only the original surface wave and ignoring the element pattern. The present technique straightforwardly takes into account the changes in phase progression due to the parasitic elements, and the element pattern is automatically included in the computation of the total radiation pattern. Author
- Electricity and Magnetism
- Radiofrequency Wave Propagation