Abstract
Conventional slotted waveguide array antennas, such as those commonly used in marine and airborne radars, tend to suffer from the presence of either double periodicity lobes or cross-polar lobes, or both, in their far-field radiation patterns, and these inhibit the creation of very low side-lobe designs. A number of possible schemes aimed at eliminating these error lobes have been proposed and these are reviewed. The impracticability of the majority of these schemes has led to the evolution of a new slot geometry that overcomes most of the difficulties associated with earlier arrangements.
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