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Abstract
In this paper, on-surface measured equation of invariance (OSMEI) method is applied to 3-D problems. The scattering of a perfectly conducting square plate illuminated by a normally incident plane wave is used as a testing example. Rather than 2-D OSMEI formulations, the new formulations in 3-D, which describe a local relationship between tangential vector potential and tangential magnetic field, require the least number of unknowns and generate a highly sparse system matrix. Numerical calculation shows that the results of the OSMEI are in good agreement with the results of method of moments (MoM) .