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  • 1
    Electronic Resource
    Electronic Resource
    Image reconstruction from real scattering data (1999)
    Bradford : Emerald
    Compel 18 (1999), S. 372-384 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: This paper deals with the inverse scattering problem of reconstructing the material properties of perfectly conducting or dielectric cylindrical objects. The material properties are reconstructed from measured far-field scattering data provided by the Electromagnetics Technology Division, AFRL/SNH, 31 Grenier Street, Hanscom AFB, MA 01731-3010. The measured data have to be calibrated for use in our reconstruction algorithm. The inverse scattering problem formulated as unconstrained nonlinear optimization problem is numerically solved using an iterative scheme with a variable calibration factor which will be determined during the optimization process. Numerical examples show the successful application of the method to the measured data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649910274937
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    BEM-computation of antenna near field reactions on conducting materials using curvilinear edge elements (1999)
    Bradford : Emerald
    Compel 18 (1999), S. 348-360 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: A boundary element method in terms of the field variables is applied to three-dimensional electromagnetic scattering problems. Especially, the influence of a dipole excited field on low conducting materials situated very close to the antenna will be discussed. We use higher order edge elements of quadilateral shape for the field approximation on curved surfaces. The tangential components of the unknown field variables are interpolated by vector element functions. The Galerkin method is implemented to obtain a set of linear equations. The applicability of the proposed edge element is investigated by the comparison of different BEM-formulations and FEM-results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649910274919
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    Paper (German National Licenses)
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