Radar sensor with recessed radome

1. A radar sensor, comprising:

a sensor housing including a cavity retaining a processing board within the cavity;

a cover forming a face of the sensor housing, the cover defining a radome having a recess into the cavity, the recess including a first area and a second area separate from and connected to the first area, wherein: the first area and the second area are each defined by a plurality of separate and distinct edges; and the first area is connected directly to the second area via a first corner of the first area that overlaps a second corner of the second area to define truncated edges of the first area and the second area;

a plurality of transmit antennas on a surface of the processing board, the transmit antennas being adjacent to and separated by a first gap from the first area, the transmit antennas configured to transmit RF signals through the first area; and

a plurality of receive antennas on the surface of the processing board, the receive antennas being adjacent to and separated by a second gap from the second area, the receive antennas configured to receive RF signals returning through the second area, wherein:

the first area and the second area of the recess are on a same plane and parallel to an outer surface of the cover.

2. The radar sensor of claim 1 , wherein centers of the plurality of receive antennas are aligned parallel along a major axis.

3. The radar sensor of claim 2 , wherein centers of the plurality of transmit antennas are offset from the major axis and aligned along a second axis oblique to the major axis.

4. The radar sensor of claim 3 , wherein the plurality of transmit antennas and the plurality of receive antennas are oriented parallel to the second axis.

5. The radar sensor of claim 4 , wherein the plurality of transmit antennas and the plurality of receive antennas are aligned to face in opposite directions.

6. The radar sensor of claim 5 , wherein patches of the plurality of receive antennas and the plurality of transmit antennas are of the same shape.

7. The radar sensor of claim 3 , wherein the major axis and the second axis are separated by an angle of substantially 45 degrees.

8. The radar sensor of claim 2 , wherein the first area and the second area are offset with respect to the major axis.

9. The radar sensor of claim 1 , wherein the plurality of receive antennas each include only a single antenna patch.

10. The radar sensor of claim 1 , wherein a first receive antenna of the receive antennas includes a lower patch edge and a second receive antenna of the receive antennas includes an upper patch edge, the lower patch edge being parallel to the upper patch edge.

11. The radar sensor of claim 2 , wherein:

a first transmit antenna of the transmit antennas includes a lower patch edge and a second transmit antenna of the transmit antennas includes an upper patch edge; and

at least a portion of the lower patch edge is disposed above at least a portion of the upper patch edge relative to a minor axis, the minor axis running perpendicular to the major axis.

12. The radar sensor of claim 1 , wherein the plurality of receive antennas include a first receive antenna with a first antenna patch and a second receive antenna with a second antenna patch, the radar sensor further comprising a first and second inoperative antenna patch, wherein the first and second receive antennas are disposed between the first and second inoperative antenna patches.

13. The radar sensor of claim 1 , wherein:

the cover thickness at the recessed area is 1.35 mm; and

the first gap and the second gap are 1.3 mm.

14. The radar sensor of claim 1 , wherein the first area of the recess and the second area of the recess are parallel to the surface of the processing board.

15. The radar sensor of claim 1 , wherein the first area of the recess and the second area of the recess maintain a gap of a set width from the surface of the processing board.