Suppression of E-Plane Sidelobes Using a Double Slit Layer in a Corporate-Feed Waveguide Slot Array Antenna Consisting of $2imes2$ -Element Radiating Units

摘要

The E-plane sidelobe level at tilts around 30 degrees-40 degrees in a Taylor distribution due to tapered excitation of units of 2x2 radiating slots is suppressed by introducing a double slit layer in a corporate-feed waveguide slot array antenna. The double slit layer act in averaging the excitation of the adjacent radiating slots for the sidelobe suppression and suppression of reflection. A 16 x 16-element array in the 70 GHz band is fabricated. At the design frequency, the sidelobe level at tilts around 30 degrees-40 degrees is suppressed to -30.0 dB from -25.4 dB. Compared to the conventional antenna, the sidelobe levels of the proposed antenna are suppressed over 71.0-76.0 GHz frequencies.