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Asymptotic behavior of the scattering solutions for a multilayered sphere
The asymptotic behavior of the scattering solutions for a point source radiating in the presence of a N-layered sphere is studied. A spectral integral representation is used to represent the potentials and the fields. The scattering solutions are approximated by the residue series arising from the poles of the integrand in the complex-order plane (v-plane). A diffraction factor D/sub 0/(v/sub p/) ...Show More
Limits and validity of the impedance boundary condition on penetrable surfaces
It has been shown that application of the impedance boundary condition (IBC), also known as the Leontovich boundary condition, is effective in solving electromagnetic scattering problems involving electrically large, penetrable bodies. However, it is important to clarify the limits and range of validity of the IBC. For example, as our results show, the IBC is not valid on pure dielectric (lossless...Show More
Hybrid solutions for large-impedance coated bodies of revolution
Electromagnetic scattering solutions are developed for coated perfectly conducting bodies of revolution (BOR) that satisfy the impedance boundary condition. The integral equation arising from the impedance (Leontovich) boundary condition is solved by use of the method of moments (MM) technique along with an Ansatz for the surface currents that is derived from physical optics (PO) and the Fock theo...Show More
Hybrid solutions at internal resonances
The use of hybrid solutions for integral equation (IE) formulations in electromagnetics is illustrated at frequencies where a perfectly conducting scatterer exhibits internal resonances. Hybrid solutions, incorporating the Fock theory and physical optics Ansatzes, and the Galerkin representation, are compared with the method of moments (MM) solutions of the electric, magnetic, and combined field f...Show More
Electromagnetic scattering from finite circular and elliptic cones
A formulation based on the physical theory of diffraction (PTD) is presented for finite conical surfaces with circular and elliptic cross sections. The base-rim discontinuity is represented by equivalent currents, including second-order terms extended for elliptic boundaries. Tip-rim interactions are examined as a function of the tip-rim distance, cone angle, and illumination angle for circular co...Show More
Hybrid solutions for scattering from large bodies of revolution with material discontinuities and coatings
A formulation is presented for electromagnetic scattering from electrically large convex bodies of revolution (BOR's) having material discontinuities. Hybrid solutions are developed for the resulting integral equations, using the method of moments (MM) technique together with the Fock or physical optics (PO) Ansatz for large convex conducting bodies where the use of the MM approach by itself is co...Show More
Hybrid solutions for scattering from perfectly conducting bodies of revolution
A current-based hybrid formulation is developed for predicting the electromagnetic scattering from conducting bodies of revolution (BOR). The electric field integral equation (EFIE) formulation of the problem is solved by incorporating the Fock solution for the surface currents on the scatterer into the method of moments (MM) solution. To treat oblique illumination, the Fock results are extended t...Show More
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