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  • 1
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    Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Electromagnetic scattering analysis of objects at resonance is difficult because low frequency techniques are slow and computer intensive, and high frequency techniques may not be reliable. A new technique for predicting the electromagnetic backscatter from electrically conducting objects at resonance is studied. This technique is based on modeling three dimensional objects as a combination of flat plates where some of the plates are blocking the scattering from others. A cube is analyzed as a simple example. The preliminary results compare well with the Geometrical Theory of Diffraction and with measured data.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-107598 , NAS 1.15:107598
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Finite element method for eigenvalue problems in electromagnetics (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Finite element method (FEM) has been a very powerful tool to solve many complex problems in electromagnetics. The goal of the current research at the Langley Research Center is to develop a combined FEM/method of moments approach to three-dimensional scattering/radiation problem for objects with arbitrary shape and filled with complex materials. As a first step toward that goal, an exercise is taken to establish the power of FEM, through closed boundary problems. This paper demonstrates the developed of FEM tools for two- and three-dimensional eigenvalue problems in electromagnetics. In section 2, both the scalar and vector finite elements have been used for various waveguide problems to demonstrate the flexibility of FEM. In section 3, vector finite element method has been extended to three-dimensional eigenvalue problems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TP-3485 , L-17392 , NAS 1.60:3485
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of electromagnetic scattering from irregularly shaped, thin, metallic flat plates (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report describes an application of the method of moments to calculate the electromagnetic scattering from irregularly shaped, thin, metallic flat plates in free space. In the present technique, an irregularly shaped plate is enclosed by a rectangle on which the surface-current density is then expressed in terms of subdomain functions by dividing the rectangle into subsections. A shape function is introduced to ensure zero current outside the patch. The surface-current density is determined using the electric field integral equation (EFIE) approach in conjunction with the method of moments, and from a knowledge of the surface-current density, the electromagnetic scattering from a plate is calculated. Using this technique, the electromagnetic scattering from a hexagonal plate; an equilateral triangular plate; an equilateral triangular plate with a concentric, equilateral triangular hole and an inverted, equilateral triangular hole; and a diamond-shaped plate is computed and compared with the numerical results obtained by using the Electromagnetic Surface Patch (ESP) code developed by Ohio State University. The numerical results compare favorably with the measurements performed on these shapes in the Langley Experimental Test Range facility.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TP-3361 , L-17218 , NAS 1.60:3361
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Transverse electric scattering widths for strips-Fourier transform technique (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A technique which is based on Fourier transformations is introduced for predicting scattering widths. For a strip it is shown that explicit determination of the linear current density is not necessary for bistatic or monostatic scattering width calculations. Comparisons of the predictions of the technique are made with the integral equation technique predictions, which do not require explicit evaluations of linear current densities.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-102729 , NAS 1.15:102729
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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