Linear antenna arrays with broad nulls with applications to adaptive arrays

The problem of designing a class of linear antenna arrays with broad nulls against interfering signals of variable direction of arrival is considered. The problem is formulated in an appropriate signal space selected for an efficient representation of array signals of specified angular occupancy. The array-weight vector is then chosen to be orthogonal to this space. The approach is seen to yield a min-max array in a sense to be defined in this paper. The application of such arrays to maintain the beamshape of an adaptive antenna array is also illustrated.