Adapting Generally Filled Cylindrical Sheet Impedances for Electromagnetic Compatibility [Measurements Corner]

The ability to control the bistatic scattering characteristics from cylindrical objects using a tapered cylindrical impedance sheet is presented. It is shown that with the capability to readily control both the real and imaginary components of a percolated lossy film's effective impedance, specific impedance distributions can be obtained to effectively introduce and direct the overall nulls in the bistatic scattering pattern. The bistatic scattering width calculations are based on a modal analysis and an impedance-sheet boundary condition formulation. Potential uses of tapered cylindrical impedance sheets in bistatic EMC/EMI applications are discussed.