Accession Number : ADA309517

Title :   Zero On-Axis Backscattering of an Anisotropically Coated Shell of Revolution.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEE RING

Personal Author(s) : Yu, Chen-Kuo ; Lee, Hung-Mou

PDF Url : ADA309517

Report Date : MAY 1996

Pagination or Media Count : 67

Abstract : A sufficient condition for eliminating the on axis backscattering of an anisotropic impedance coated shell of revolution has been deduced. The outside and inside normalized surface impedances Z+ and Z with which this sufficient condition can be satisfied have all been found. One exceptional situation is when the impedance matrices are equal and skew symmetric with their determinants equal to -1. All other cases require that the two matrices be symmetric, their determinants be unity, and the determinant of their difference be zero. The shell under consideration can be a closed one. For such a body of revolution only the conditions on Z+ need to apply, i.e., Z+ must be either symmetric or skew symmetric, with detZ+ = +1. This is an extension of Weston's result to anisotropically coated bodies. Results of this work make available a wide class of models which, must have zero on axis backscattering cross section. All general purpose numerical codes for computing the scattering cross sections of anisotropic impedance coated objects should be checked for their accuracy against a selected group of such models. Such comparisons should provide indications of an error bound of the particular algorithm.

Descriptors :   *ELECTROMAGNETIC SCATTERING, *BACKSCATTERING, ALGORITHMS, MATRICES(MATHEMATICS), SCATTERING CROSS SECTIONS, ACCURACY, SHELLS(STRUCTURAL FORMS), COATINGS, ANISOTROPY, SYMMETRY, SKEWNESS, ELECTRICAL IMPEDANCE.

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE