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Abstract
We develop an optimal control algorithm, using a BI method, in order to obtain the most favourable RAM coating on a given 3D perfectly conducting scatterer, minimizing its monostatic RCS. The RAM is simulated using a first order impedance boundary condition with a scalar surface impedance corresponding to an isotropic passive structure and defined pointwise on the surface. The optimality system, resulting from a Lagrangian approach, turns this complex problem into a sequence of line searches through standard descent methods. Then we may compute an optimal solution corresponding to a local minimum of the scatterer's RCS according to several electromagnetic configurations.