Post-wall Waveguide Series-fed Sidelobe-suppression Slot Subarray Antenna for Millimeter-wave Radar

We design a center-feed post-wall waveguide slot subarray of 25 radiating elements that suppress E-plane sidelobes below -18dB for the 76.5 GHz band (76.0 GHz to 77.0 GHz). The radiating elements are designed so that the excitation distribution calculated from a Taylor distribution is obtained. As the result, the sidelobe levels are sufficiently suppressed below -18 dB from 76.0 GHz to 76.6 GHz in both analysis and experiment.