A large W-band slotted waveguide array

Summary form only given. Slotted arrays at millimeter-wave frequencies play an important role in commercial applications such as collision radars and synthetic vision systems. The authors describe the design, fabrication and testing of a 3-ft-long slotted waveguide array having 600 edge wall slots. The design represents a low-loss technique for achieving a high-resolution pattern and uses a standard WR-10 copper waveguide for minimal ohmic loss. The slot angles are varied to radiate a nearly uniform illumination with minimal power absorbed in the load. The arrays are embedded in a fared waveguide section to enhance the discrimination in the direction orthogonal to the waveguide axis and to increase the array gain. The arrays have been tested in the laboratory environment for return loss and insertion loss. They have also have been tested on the EMS planar near-field facility for near-field amplitude and phase and the resulting far-field patterns