Analysis of Electromagnetic Scattering from Irregularly Shaped, Thin, Metallic Flat Plates PDF Download
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Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781729303696 Category : Languages : en Pages : 56
Book 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. Deshpande, Manohar D. and Cockrell, C. R. and Beck, Fred B. and Vedeler, Erik and Koch, Melissa B. Langley Research Center
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781729303696 Category : Languages : en Pages : 56
Book 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. Deshpande, Manohar D. and Cockrell, C. R. and Beck, Fred B. and Vedeler, Erik and Koch, Melissa B. Langley Research Center
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781723722387 Category : Science Languages : en Pages : 42
Book Description
The problem of electromagnetic (EM) scattering from irregularly shaped, thin, metallic flat plates in free space is solved using the electric field integral equation (EFIE) approach in conjunction with the method of moments (MoM) with quadrilateral meshing. An irregularly shaped thin plate is discretized into quadrilateral patches and the unknown electric surface current over the plate is expressed in terms of proper basis functions over these patches. The basis functions for the electric surface current density that satisfy the proper boundary conditions on these quadrilateral patches are derived. The unknown surface current density on these quadrilateral patches is determined by setting up and solving the electric field integral equation by the application of the MoM. From the knowledge of the surface current density, the EM scattering from various irregularly shaped plates is determined and compared with the earlier published results. The novelty in the present approach is the use of quadrilateral patches instead of well known and often used triangular patches. The numerical results obtained using the quadrilateral patches compare favorably with measured results.Deshpande, Manohar D.Langley Research CenterELECTROMAGNETIC SCATTERING; METHOD OF MOMENTS; FLAT PLATES; COMPUTATIONAL GRIDS; ELECTRIC CURRENT; CURRENT DENSITY; SURFACE PROPERTIES; INTEGRAL EQUATIONS; MATHEMATICAL MODELS; BOUNDARY CONDITIONS; NUMERICAL ANALYSIS
Author: National Aeronautics and Space Adm Nasa
Author: National Aeronautics and Space Adm Nasa
Author: Manohar D. Deshpande
Author: National Aeronautics and Space Adm Nasa
Author: Manohar D. Deshpande
Author: Manohar D. Deshpande
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Author: Fathi Abdalla Sikta