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absorber amplitude analytical angle of incidence antenna approximation aspect angles average backscattering cross average scattering axial axis backscatter cross section bistatic cross sections bistatic scattering body circular polarization cone cone-sphere corner reflector cos2 creeping wave creeping-wave curves cylinder degrees Fig dielectric diffraction discussed in Section echo edge effects electron density equations estimate exponential frequency Fresnel reflection function Gaussian geometrical grazing high-frequency impedance incident field incoherent ionized ionosphere layer linear polarization load Mcps measured medium normal incidence obtained parallel polarization parameters perfectly conducting surface permittivity perpendicular polarization phase physical optics physical-optics plane wave plasma plate radar cross section radius Rayleigh reflection coefficient region resonance rough surface Salisbury screen scattered field scattered power scattering cross section section per unit shape shown in Figure sin2 slot solution specular contribution sphere spheroid surface-height correlation coefficient target technique unit area valid values velocity versus the angle vertical wavelength zero