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Scattering by superquadric dielectric-coated cylinders using higher order impedance boundary conditions

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2 Author(s)
Hoppe, D.J. ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Rahmat-Samii, Y.

A general method for deriving higher order impedance boundary conditions is described. It is based on solving an appropriate canonical problem exactly in the spectral domain. After approximating the spectral impedance terms as a ratio of polynomials in the transform variable, elementary properties of the Fourier transform are used to obtain the corresponding boundary condition in the spatial domain. The method is applicable to multilayer coatings with arbitrary constitutive relations. Higher-order boundary conditions which neglect the effects of curvature are derived for a dielectric coating using the method. The boundary condition equation and the magnetic field integral equation are solved simultaneously using the method of moments, yielding the bistatic and monostatic radar cross section for dielectric-coated superquadric cylinders. The method is also applicable to a combined field integral equation (CFIE) solution, which can be used to eliminate the internal resonance problem associated with either the electric field integral equation (EFIE) or magnetic field integral equation (MFIE)

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Antennas and Propagation, IEEE Transactions on  (Volume:40 ,  Issue: 12 )