Antenna slot array configurations and related vehicle sensor signal patterns
Waveguide and/or antenna structures for use in RADAR sensor assemblies and the like. In some embodiments, an antenna module for a vehicle sensor may comprise a receive (RX) array of elongated RX antenna slots and a transmit (TX) array of TX antenna slots. The TX array may comprise both one or more vertically-shifted TX antenna slots and one or more high-gain and/or squinted TX antenna arrays, each comprising a plurality of high-gain antenna slots.
1. An antenna module for a vehicle sensor, comprising:
a receive (RX) array of elongated RX antenna slots;
a transmit (TX) array of TX antenna slots, the TX array of TX antenna slots comprising:
an elongated TX antenna slot, wherein the elongated TX antenna slot is shifted vertically in a vertical direction along an axis of the elongated TX antenna slot relative to each of the elongated RX antenna slots of the RX array; and
a high-gain TX antenna array positioned adjacent to the elongated TX antenna slot, the high-gain TX antenna array comprising a plurality of high-gain antenna slots formed in a plurality of columns, wherein each of the plurality of high-gain antenna slots is shorter in length in a direction along the axis of the elongated TX antenna slot than the elongated TX antenna slot.
2. The antenna module of claim 1 , wherein the TX array of TX antenna slots further comprises a second elongated TX antenna slot.
3. The antenna module of claim 2 , wherein the high-gain TX antenna array is positioned in between the elongated TX antenna slot and the second elongated TX antenna slot.
4. The antenna module of claim 3 , wherein the second elongated TX antenna slot is shifted vertically in the vertical direction along the axis of the elongated TX antenna slot relative to the elongated TX antenna slot.
5. The antenna module of claim 4 , wherein the second elongated RX antenna slot is positioned adjacent to a peripheral edge of the antenna module.
6. The antenna module of claim 3 , wherein the antenna module comprises a vehicle RADAR module, and wherein the second elongated TX antenna slot is spaced apart in a horizontal direction perpendicular to the vertical direction from the elongated TX antenna slot by a distance corresponding to about five wavelengths of the electromagnetic radiation used in the antenna module.
7. The antenna module of claim 1 , wherein the high-gain TX antenna array comprises a squinted-beam TX antenna array configured to direct an electromagnetic signal at an angle relative to an electromagnetic signal associated with the elongated TX antenna slot.
8. A vehicle antenna assembly, comprising:
a receive (RX) array of elongated RX antenna slots;
a transmit (TX) array of TX antenna slots, the TX array of TX antenna slots comprising:
a boresight beam array of one or more TX antenna slots configured to direct a first electromagnetic signal in a first direction; and
a squinted beam array of TX antenna slots configured to direct a second electromagnetic signal in a second direction at an angle relative to the first electromagnetic signal and overlapping with the first electromagnetic signal,
wherein the TX array of TX antenna slots further comprises a second squinted beam array of TX antenna slots, wherein the second squinted beam array of TX antenna slots is configured to direct a third electromagnetic signal in a third direction at a second angle relative to the first electromagnetic signal and overlapping with the first electromagnetic signal, wherein the second angle extends in a direction opposite the first angle relative to the first direction, and wherein the boresight beam array of TX antenna slots is vertically shifted along an elongated axis of the boresight beam array with respect to at least one of the squinted beam array and the second squinted beam array.
9. The vehicle antenna assembly of claim 8 , wherein the second angle is between 30 degrees and 60 degrees.
10. The vehicle antenna assembly of claim 8 , wherein the boresight beam array of one or more TX antenna slots is vertically shifted along the elongated axis of the boresight beam array with respect to both the squinted beam array and the second squinted beam array.
11. The vehicle antenna assembly of claim 10 , wherein the boresight beam array comprises only a single TX antenna slot.
12. The vehicle antenna assembly of claim 8 , wherein the boresight beam array comprises at least one TX antenna slot that is vertically shifted relative to at least one other TX antenna slot along an axis of the at least one TX antenna slot.
13. The vehicle antenna assembly of claim 12 , wherein the boresight beam array comprises only two TX antenna slots, and wherein both of the two TX antenna slots fall within a vertical footprint of the squinted beam array.
14. A vehicle antenna assembly, comprising:
a receive (RX) array of elongated RX antenna slots, wherein at least one of the elongated RX antenna slots comprises a shifted, elongated RX antenna slot that is shifted vertically in a vertical direction along an axis of the shifted, elongated RX antenna slot relative to each of the other elongated RX antenna slots of the RX array;
a transmit (TX) array of elongated TX antenna slots that differ in both shape and length relative to each of the elongated RX antenna slots of the RX array.
15. The vehicle antenna assembly of claim 14 , wherein each of the elongated TX antenna slots intermittently oscillates on opposite sides of its respective elongated axis along at least a portion of its respective elongated axis.
16. The vehicle antenna assembly of claim 15 , wherein each of the elongated RX antenna slots extends at least substantially along a straight line.
17. The vehicle antenna assembly of claim 14 , wherein the vehicle antenna module comprises a RADAR module, and wherein the shifted, elongated RX antenna slot is shifted by a distance corresponding to about one-half of a wavelength of the electromagnetic radiation used in the vehicle antenna module.
18. The vehicle antenna assembly of claim 14 , wherein each of the elongated RX antenna slots is at least substantially equally spaced apart from one another in a horizontal direction perpendicular to the vertical direction.
19. A vehicle antenna assembly, comprising:
a receive (RX) array of elongated RX antenna slots;
a transmit (TX) array of TX antenna slots, the TX array of TX antenna slots comprising:
a boresight beam array of one or more TX antenna slots configured to direct a first electromagnetic signal in a first direction; and
a squinted beam array of TX antenna slots configured to direct a second electromagnetic signal in a second direction at an angle relative to the first electromagnetic signal and overlapping with the first electromagnetic signal,
wherein the boresight beam array comprises at least one TX antenna slot that is vertically shifted relative to at least one other TX antenna slot along an axis of the at least one TX antenna slot, wherein the boresight beam array comprises only two TX antenna slots, and wherein both of the two TX antenna slots fall within a vertical footprint of the squinted beam array.