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Prediction of the asymptotical magnetic polarization tensors for cylindrical samples using the boundary element method

The magnetic polarization tensor is a frequency-dependent, rotation-invariant and object-specific property of a metallic object. This paper presents an approach to compute the magnetic polarization tensor of a metallic object based on the Boundary Element Method (BEM), which treats the object as a perfect electrical conductor (PEC) and therefore is able to predict the limiting cases where very high frequency and/or high conductivity is assumed. A uniform magnetic field is applied to an object and the scattered field at a certain distance is obtained in the simulations. The magnetic tensor can then be deduced from the scattered field. The simulated results agree well with an analytical solution for spheres and with measured results for a number of cylinders for limiting cases.