Hybrid methods for analysis of complex scatterers
Article Abstract:
A coupled hybrid method of moments (MM) approach is developed for the analysis of the electromagnetic scattering of electrically large, complex two- and three-dimensional objects. The new methodology integrates high-frequency asymptotic Ansatz techniques derived from the geometrical and physical theories of diffraction with numerical MM techniques for complex conducting or penetrable bodies. The analysis approach can be field-based or current-based. The field-based approach is useful for the solution of scattering problems where the radiator is close to large convex surfaces, while the current-based solution is particularly useful for objects whose surfaces contain material for geometric irregularities. The hybrid approach can treat classes of scatterers with forward scattering, oblique illumination, perfectly conducting, or coated with lossy materials.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
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Moment method with isoparametric elements for three-dimensional anisotropic scatterers
Article Abstract:
A new moment method is developed for the computation of frequency-domain electromagnetic fields penetrating and scattered from inhomogeneous, anisotropic (as well as isotropic), lossy objects of arbitrary three-dimensional shapes. The method formulates the scattering problem as a general volume integro-differential in the frequency domain. The method of moments and point matching enable the numerical solution of the coupled integral equations, with the numerical model generated through the use of parametric volume elements and basic functions. The parametric elements improve the geometrical approximation of the scattering object without the need for rescaling. Numerical results are developed for both anisotropic and isotropic spherical scatterers, with the results validated through comparison with Mie solutions for isotropic scatterers.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
User Contributions:
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Relationships between antennas as scatterers and as radiators
Article Abstract:
The relationship between the scattering and radiation aspects of antennas is derived. A scattered field expression is developed that shows that the field strength for any load impedance is the sum of the short-circuit scattered field and the radiation field times. A radar cross-section expression can be subsequently derived from the scattered field expression. Structural scatter is shown to be about four times the antenna scatter. The underlying equations are represented and solved.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
User Contributions:
Comment about this article or add new information about this topic:
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