Antenna-equipped light bar
Disclosed is a light bar having improved weather resistance, aerodynamics, antenna performance, and platform versatility by accommodating user-selectable antenna modules.
1. An antenna-equipped light bar, comprising:
a light bar housing in which are mounted lighting devices communicatively coupled to electrical circuitry;
a cover for the light bar housing, the cover including a domed region and a major surface region, the domed region defining an interior cavity for which at least a portion of the interior cavity is located above a plane defined by the major surface region;
a shielding panel located in the light bar housing and electrically isolated from the electrical circuitry coupled to the lighting devices, the shielding panel positioned in the light bar housing to provide shielding of electromagnetic interference (EMI) associated with the electrical circuitry coupled to the lighting devices, in which the shielding panel is integrated into the cover; and
an antenna mounted atop the shielding panel so as to be at least partly shielded from the EMI.
2. The antenna-equipped light bar of claim 1 , in which at least a portion of the antenna is located in the interior cavity and above the plane.
3. The antenna-equipped light bar of claim 1 , in which the domed region is centrally located in the cover.
4. The antenna-equipped light bar of claim 1 , in which the lighting devices are mounted at locations below the shielding panel.
5. The antenna-equipped light bar of claim 1 , in which the antenna comprises a multi-element antenna module.
6. The antenna-equipped light bar of claim 1 , in which the antenna includes a cellular antenna configured for cellular V2X wireless communications.
7. A system, comprising:
an antenna-equipped light bar, including:
a light bar housing in which are mounted lighting devices communicatively coupled to electrical circuitry;
a shielding panel located in the light bar housing and electrically isolated from the electrical circuitry coupled to the lighting devices, the shielding panel positioned in the light bar housing to provide shielding of electromagnetic interference (EMI) associated with the electrical circuitry coupled to the lighting devices; and
an antenna mounted atop the shielding panel so as to be at least partly shielded from the EMI;
a human-machine interface (HMI); and
an on-board unit for converting from first electrical signals into second electrical signals, the first electrical signals being generated by the HMI indicating that the lighting devices are on, and the second electrical signals being generated by the on-board unit for wireless broadcast using the antenna.
8. The system of claim 7 , in which the HMI triggers the on-board unit to cause the antenna to wirelessly broadcast a J2735 light bar in use data element.
9. The system of claim 7 , in which the HMI triggers the on-board unit to cause the antenna to wirelessly broadcast a J2735 emergency vehicle alert message.
10. The system of claim 7 , further comprising a serial-interface board (SIB), in which the SIB communicatively couples to the on-board unit and the HMI.
11. The system of claim 7 , in which the wireless broadcast using the antenna indicates that a vehicle carrying the system is a light bar-equipped vehicle.
12. The system of claim 11 , in which the HMI triggers the on-board unit to cause the antenna to wirelessly broadcast a state of a light bar deployed on the vehicle to change a traffic light.
13. The system of claim 7 , in which the HMI is one or more of a touchscreen, keypad, or OLED display panel.
14. The system of claim 7 , in which the on-board unit is configured as a CAN node.
15. The system of claim 7 , in which the on-board unit is configured to receive, via the antenna, wireless messages from a road-side unit.
16. The system of claim 7 , in which the on-board unit is configured to receive, via the antenna, wireless messages from another vehicle having a V2X or DSRC antenna.
17. The system of claim 7 , further comprising a cover for the light bar housing, the cover including a domed region and a major surface region, the domed region defining an interior cavity for which at least a portion of the interior cavity is located above a plane defined by the major surface region.
18. The antenna-equipped light bar of claim 17 , in which at least a portion of the antenna is located in the interior cavity and above the plane.
19. The antenna-equipped light bar of claim 17 , in which the domed region is centrally located in the cover.
20. The antenna-equipped light bar of claim 7 , in which the lighting devices are mounted at locations below the shielding panel.
21. The antenna-equipped light bar of claim 7 , in which the antenna comprises a multi-element antenna module.
22. The antenna-equipped light bar of claim 7 , in which the antenna includes a cellular antenna configured for cellular V2X wireless communications.
23. An antenna-equipped light bar, comprising:
a light bar housing in which are mounted lighting devices communicatively coupled to electrical circuitry;
a shielding panel located in the light bar housing and electrically isolated from the electrical circuitry coupled to the lighting devices, the shielding panel positioned in the light bar housing to provide shielding of electromagnetic interference (EMI) associated with the electrical circuitry coupled to the lighting devices, in which the shielding panel includes one or more lateral shielding panels and central ground plane on which the antenna is mounted; and
an antenna mounted atop the shielding panel so as to be at least partly shielded from the EMI.
24. The antenna-equipped light bar of claim 23 , further comprising a cover for the light bar housing, the cover including a domed region and a major surface region, the domed region defining an interior cavity for which at least a portion of the interior cavity is located above a plane defined by the major surface region.
25. The antenna-equipped light bar of claim 24 , in which at least a portion of the antenna is located in the interior cavity and above the plane.
26. The antenna-equipped light bar of claim 24 , in which the domed region is centrally located in the cover.
27. The antenna-equipped light bar of claim 22 , in which the lighting devices are mounted at locations below the shielding panel.
28. The antenna-equipped light bar of claim 22 , in which the antenna comprises a multi-element antenna module.
29. The antenna-equipped light bar of claim 22 , in which the antenna includes a cellular antenna configured for cellular V2X wireless communications.