Superdirective arrays: the use of decoupling between elements to ease design and increase bandwidth

The design and achievement of superdirective receiving arrays for radio or acoustic waves can be greatly eased by the use of decoupling arrangements between the elements, such as buffer amplifiers in the output of each element before the outputs are combined to form the directional pattern. By this means, too, the severe bandwidth restrictions normally associated with superdirectivity can be removed.