Design of a phase/frequency scanned array antenna with non-resonant slotted ridge waveguide elements

The synthesis of a two-dimensionally scanned antenna is presented. The antenna is scanned in one direction by ferrite phase shifters and in the other direction by frequency scanned waveguides. In order to accomplish a wide electronic scan range the waveguide width has been reduced by ridge loading. The radiating elements consist of broadwall shunt slots. The characterization of the radiating slots has required the development of new design models as well as special testing techniques. The antenna requirements include a large scan sector in azimuth, low sidelobes, high pointing accuracy, and high antenna gain. These requirements demand an accurate design method and a well-controlled manufacturing process. A large antenna was designed, manufactured, and, tested, consisting of 48 waveguides, each fed through 8-bit ferrite phase shifters.<>