US Patent 11626668 Waveguide end array antenna to reduce grating lobes and cross-polarization

This document describes techniques, apparatuses, and systems directed to a waveguide end array antenna to reduce grating lobes and cross-polarization. Referred to simply as the waveguide, for short, utilizes a core made of a dielectric material to guide electromagnetic energy from a waveguide input to one or more radiating slots. The dielectric core includes a main channel and one or more forks. Each fork connects the main channel to one or more tine sections, and each tine section is terminated by a closed end and a radiating slot. These radiating slots are separated from each other by a distance to enable at least a portion of the electromagnetic energy to dissipate in phase through the radiating slots. The dielectric core of the waveguide reduces grating lobes and cross-polarization associated with the electromagnetic energy. An automobile can rely on the waveguide to detect objects with increased accuracy.