Azimuthal steering antenna for side radar

An antenna assembly configured to steer a radio frequency (RF) signal to a focus area offset from an azimuth center, the antenna assembly comprising:

• a circuit board including an integrated circuit configured to process the RF signal, and a conductive trace extending from the integrated circuit;
• a waveguide plate over the circuit board, the waveguide plate including a waveguide configured to guide the RF signal at least one of to and from the conductive trace;
• and
• a conductive top plate over the waveguide plate, the conductive top plate including,
• an outer surface and an inner surface facing the waveguide plate, the outer surface is opposite to the inner surface,
• a feed horn defined by the conductive top plate, and
• a step defined by the conductive top plate adjacent to the feed horn, the step including a tread surface extending parallel to the outer surface of the conductive top plate, a riser surface extending away from the tread surface towards the outer surface of the conductive top plate, a first curved surface extending from the feed horn to the tread surface, a second curved surface between the tread surface and the riser surface, and a third curved surface between the riser surface and the outer surface.

An antenna assembly configured to steer a radio frequency (RF) signal to a focus area offset from an azimuth center, the antenna assembly comprising:

• a circuit board including an integrated circuit configured to process the RF signal, and a conductive trace extending from the integrated circuit;
• a waveguide plate over the circuit board, the waveguide plate including a waveguide configured to guide the RF signal at least one of to and from the conductive trace;
• and
• a conductive top plate over the waveguide plate, the conductive top plate including,
• an outer surface and an inner surface facing the waveguide plate, the outer surface is opposite to the inner surface,
• a feed horn defined by the conductive top plate between the inner surface and the outer surface, the feed horn is aligned with the waveguide,
• a first surface and a second surface of the feed horn, the first surface is opposite to the second surface and is angled towards the focus area away from the second surface, and
• a step defined by the conductive top plate extending towards the focus area from the first surface to the outer surface, the step including a tread surface extending parallel to the outer surface of the conductive top plate, a riser surface extending away from the tread surface towards the outer surface of the conductive top plate and configured to steer the RF signal to emanate from the outer surface of the conductive top plate towards the focus area, a first curved surface extending from the first surface of the feed horn to the tread surface, a second curved surface between the tread surface and the riser surface, and a third curved surface between the riser surface and the outer surface;
• wherein:
• the tread surface has a depth of between 0.25 and 0.5 of a wavelength of the RF signal;
• and
• the riser surface has a height of 0.25 of the wavelength of the RF signal.