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antenna approximation aspect angle asymptotic axial backscatter cross section backscattered field backscattering widths Bessel functions bistatic scattering widths body circular cylinder coating computed cone creeping wave curves cylinder axis defined diffraction dipole edge electric field ellipsoid elliptic cylinder Exact solutions expressions far-zone finite forward scattering cross forward scattering widths frequency Fresnel geometrical optics given by Eqs high-frequency limit impulse response incident field incident wave infinitely long integral equation lossy low-frequency Luneberg lens Mathieu functions Maxwell's equations normal incidence numerical oblique incidence obtained parallel polarization perfectly conducting cylinder perfectly conducting sphere phase physical optics physical-optics plane of incidence plane wave incident prolate spheroid propagation radar cross section radiation radius Reference reflection coefficients refractive index resonance region scattered field scattering cross section scattering problems series solution shadow boundary shown in Figure specular point spherical stationary ray surface currents target techniques valid values wavelength wedge wire zero