NULL STEERING USING THE MINIMAX APPROXIMATION BY CONTROLLING ONLY THECURRENT AMPLITUDES

A linear programming technique using the minimax approximation to stee r the nulls of an array by controlling the current amplitudes is prese nted. The technique determines the current amplitudes that produce the minimum sidelobe level for a given beam width and prescribed nulls in arbitrary directions. The results show the ability of this technique to steer the nulls in the sidelobe region while maintaining the main b eam directed towards the desired signal. This technique also allows th e number of controlled nulls to attain the full degrees of freedom for the array.