Model for Nearfield Electromagnetic Shielding by Cylindrical Shells of Composite Materials.
NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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This report describes the shielding of sources by cylindrical shells of composite materials that are characterized by complex permeability and permittivity. The primary objective of the investigation is to develop a mathematical model of the magnetic, magnetizing, electric, and displacement fields as they exist in the presence of the cylindrical shell. This is accomplished by solving the magnetostatic problem, first by formulating the nearfield source in binomial expansions and the fields around the cylindrical shell in powers of Legendre polynomials and then by applying the boundary conditions of the fields to the cylindrical surface of the shell. The magnetostatic solution is used as input to alternate iterations of Faradays law and Amperes law to generate a perturbation expansion of the fields.
- Electricity and Magnetism