Roadside beacon system with polarized beams

Details Roadside beacon system with polarized beams Roadside beacon system with polarized beams

1987-11-25

1991-01-08

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With vehicle

343713, 342457, H01Q 132

Patent

active

049839845

ABSTRACT:
In a roadside beacon system for transmitting to vehicles moving along roads, signals on position and direction, linearly polarizing antennas mounted to be stationarey either beside or above the roads and other linearly polarizing antennas mounted to be mobile on the vehicles. The downwardly transmitting stationary and the upwardly receiving mobile antennas have matching linear polarizations when the vehicle is traveling on the road adjacent to the antenna but a mobile antenna will have reduced sensitivity when moving on a road at a different angle.

REFERENCES:
patent: 2904674 (1959-09-01), Crawford
patent: 3423681 (1969-01-01), McKenna
patent: 3702479 (1972-11-01), Uhrig
patent: 3735335 (1973-05-01), Kaplan et al.
Johnson et al., Antenna Engineering Handbook, published by McGraw-Hill Book Company, New York, N.Y., 2nd Edition, 1984, pp. 15-1 to 15-13.

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