Directional antennas for a roadside beacon system

Details Directional antennas for a roadside beacon system Directional antennas for a roadside beacon system

1989-03-16

1991-08-20

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

G01S 302

Patent

active

050418378

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.

REFERENCES:
patent: 3086196 (1963-04-01), Sande
patent: 3735335 (1973-05-01), Kaplan et al.
patent: 3757290 (1973-09-01), Ross et al.
patent: 4209787 (1980-06-01), Freeny, Jr.
patent: 4317117 (1982-02-01), Chasek
Antennas, Kraus, 1950, pp. 376, 381.
Patent Abstracts of Japan, V5N55 4/81 (E-52)[727].
IEEE Translation on Vehicular Technology, Feb. 1977.
Transaction for "Vehicle Automation Symposium, 8th", held on Jan. 22, 1985.

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