Design of Ridge Waveguide Array Antenna for Radar

In this paper, we suggest a wide-angle waveguide array antenna for radar operation and designed a ridge waveguide antenna to enlarge the beam steering angle. A miniaturization rate of 48.2% was obtained compared to the WR-90 waveguide. Using this, a 1×8 array antenna was designed and manufactured. The average beam-width of each antenna was 120°. A number of phase shifters corresponding to the beam steering angle were fabricated, and it confirmed that the measured beam steering angle was consistent with the designed beam steering angle. Accordingly, the designed antenna has characteristics suitable for beam steering of a hexagonal array structure.