A PHYSICAL OPTICS APPROXIMATION OF THE SCATTERING FOR AXIAL INCIDENCE FROM ROTATIONALLY SYMMETRIC TARGETS
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB
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A physical optics approximation to the monostatic and bistatic scattering for axial incidence from rotationally symmetric targets is developed. Both conducting and lossy dielectric bodies, characterized by a surface impedance equal to the intrinsic impedance of the scattering medium, are treated. The resulting general expressions, which are valid within the physical optics approximation for any rotationally symmetric target, are specialized to long, thin, shapes, either finite with sharp apices or semi infinite with a sharp apex, by a modification of the normal physical optics approximation. Theoretical calculations of the axial back scatter from spheres, double cones, parabolic ogives, semi-infinite cones, and semi-infinite cylinders with conical caps for several values of the scatterer surface impedance are presented. Theoretical calculations of the bistatic E plane plane of the incident E field cross-section of conducting semi-infinite cones, double cones, and semi-infinite cylinders with conical caps are also given. Where possible, the theoretical results are compared with the exact solution or with representative experimental data to indicate the validity of the theory.
- Theoretical Mathematics