Grating lobe control in limited scan arrays

The use of multiple higher order modes for grating lobe control in arrays of large aperture elements scanned over restricted spatial sectors is described. Arrays of this type are useful in a number of applications including precision approach radar, weapons locators, and satellite communications systems. An extensive experimental and theoretical study that includes the design and use of dielectric lenses for control of -plane null filling for an eight-element array, the investigation of null width effects on sidelobe levels, the experimental study of an element and control circuitry for two-dimensional scan, bandwidth effects, and the use of dielectric spatial filters and row displacement for residual grating lobe suppression is summarized.