Directional antennas for a roadside beacon system
US5041837A · kind A · utility
2Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Mar 16, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/13
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A roadside beacon system in which a plurality of roadside antennas transmit data to vehicles passing closely adjacent. The transmitting antennas are mounted high above the sides of the roads and have a gain pattern directed obliquely downward. The mobile antennas on the cars have gain patterns directed upwardly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.