Suppression of E-plane Sidelobes using Double Slit layers in a Corporate-feed Waveguide Slot Array Antenna consisting of 22-element Radiating Units

We suppress E-plane sidelobe level in the tilted directions around 30-40 degrees in Taylor distribution pattern coming from the tapered excitation of units of the 2× 2 radiating slots by introducing double slit layers in a corporate-feed waveguide slot array antenna. The structure of the double slit layers is introduced to control the excitation and the reflection separately. The analysis model consists of 2× 8 elements using symmetry for the E-plane and periodicity for the H-plane in the 70 GHz band. A 9.9 % bandwidth of VSWR less than 1.5 is achieved. The sidelobe level of the tilted directions around 30-40 deggrees is suppressed to-29.4 dB from-24.6 dB at the design frequency.