EP0289657A2
Expired / Lapsed
EP
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Roadside beacon system with polarized beams
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1987-11-25
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Granted: —
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Expires: 2007-11-25
Abstract
Abstract In a roadside beacon system for transmitting to vehicles moving along roads signals on position and direction, linearly polarizing antennas mounted to be stationary 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.
Inventors
- 👤 Yoshizo C/O Osaka Works Shibano
- 👤 Haruo C/O Osaka Works Suzuki
- 👤 Tohru C/O Osaka Works Iwai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 06:49
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0967; G08G1/096766; G08G1/096783; G01; G01S; G01S1/00; G01S1/02; G01S1/04; G08G1/096708; G08G1/096716; G08G1/096733; G08G1/096758
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A roadside beacon system, comprising: a plurality of roadside antennas for transmitting signals; and a mobile antenna mounted on a vehicle traveling in a respective direction on a respective one of a plurality of roads running adjacent a respective one of said roadside antennas for receiving said signals; wherein each of said roadside antennas transmits said signals with a linear polarization in a horizontal plane at a substantially common orientation with respect to said respective direction associated with said each roadside antenna; and wherein said mobile antenna preferentially receives said signal with said polarization over signals polarized at other orientations in said horizontal plane.
Claim 2
Dependent Claim
104 words
A roadside beacon system, comprising: a plurality of roadside antennas for transmitting signals; and a mobile antenna mounted on a vehicle traveling in a respective direction on a respective one of a plurality of roads running adjacent a respective one of said roadside antennas for receiving said signals; wherein each of said roadside antennas transmits said signals with a linear polarization in a horizontal plane at a substantially common orientation with respect to said respective direction associated with said each roadside antenna; and wherein said mobile antenna preferentially receives said signal with said polarization over signals polarized at other orientations in said horizontal plane.
Claim 3
Dependent Claim
27 words
A roadside beacon system as recited in Claim 1, wherein said linear polarization in said horizontal plane extends in a widthwise direction of each of said roads.
Claim 4
Dependent Claim
25 words
A roadside beacon system as recited in Claim 1, wherein said linear polarization in said horizontal plane extends in a lengthwise direction of said road.
Claim 5
Dependent Claim
90 words
A roadside beacon system as recited in Claim 1, wherein said roadside antennas comprise: at least one side mounted roadside antenna mounted at a side of one of said roads and transmitting said signals obliquely downward with a polarization selected from one of horizontal and vertical polarizations; and at lease one overhead mounted roadside antenna mounted on a structure overhanging said respective road and transmitting said signals downward with a polarization selected from one of a widthwise direction of said respective road and a lengthwise direction of said respective road.
Claim 6
Dependent Claim
25 words
A roadside beacon system as recited in Claim 1, further comprising transmitting means for transmitting over said roadside antennas data including at least position data.
Claim 7
Dependent Claim
162 words
A roadside beacon system comprising a plurality of roadside antennas for transmitting signals and installed along roads and a plurality of mobile antennas mounted on respective vehicles traveling on said roads for receiving said signals, wherein at least one roadside antenna, at a position where a structure is extended over a road, is mounted on a lower portion of said structure to transmit and receive in a downward direction a radio wave polarized in a widthwise direction of said road, and at least one roadside antenna is installed near said road to transmit and receive a vertically polarized radio wave in an obliquely downward direction, and wherein each mobile antenna transmits and receives a horizontally polarized radio wave in a direction of travel of said vehicle, a vertically polarized radio wave in a direction perpendicular to the direction of travel of said vehicle, and a radio wave polarized in the widthwise direction of said vehicle in an upward direction of said vehicle.
Claim 8
Dependent Claim
162 words
A roadside beacon system comprising a plurality of roadside antennas for transmitting signals and installed along roads and a plurality of mobile antennas mounted on respective vehicles traveling on said roads for receiving said signals, wherein at least one roadside antenna, at a position where a structure is extended over a road, is mounted on a lower portion of said structure to transmit and receive in a downward direction a radio wave polarized in a widthwise direction of said road, and at least one roadside antenna is installed near said road to transmit and receive a vertically polarized radio wave in an obliquely downward direction, and wherein each mobile antenna transmits and receives a horizontally polarized radio wave in a direction of travel of said vehicle, a vertically polarized radio wave in a direction perpendicular to the direction of travel of said vehicle, and a radio wave polarized in the widthwise direction of said vehicle in an upward direction of said vehicle.
Claim 9
Dependent Claim
163 words
A roadside beacon system comprising a plurality of roadside antennas for transmitting signals and installed along roads and a plurality of mobile antennas mounted on respective vehicles traveling on said roads for receiving said signals, wherein at least one roadside antenna, at a position where a structure is extended over a road, is mounted on a lower portion of said structure to transmit and receive in a downward direction a radio wave polarized in a lengthwise direction of said road, and at lease one roadside antenna is installed near said road to transmit and receive a horizontally polarized radio wave in an obliquely downward direction, and wherein each mobile antenna transmits and receives a horizontally polarized radio wave in a direction perpendicular to a direction of travel of said vehicle, a vertically polarized radio wave in the direction of travel of said vehicle, and a radio wave polarized in the direction of travel of said vehicle in an upward direction of said vehicle.
Claim 10
Dependent Claim
163 words
A roadside beacon system comprising a plurality of roadside antennas for transmitting signals and installed along roads and a plurality of mobile antennas mounted on respective vehicles traveling on said roads for receiving said signals, wherein at least one roadside antenna, at a position where a structure is extended over a road, is mounted on a lower portion of said structure to transmit and receive in a downward direction a radio wave polarized in a lengthwise direction of said road, and at lease one roadside antenna is installed near said road to transmit and receive a horizontally polarized radio wave in an obliquely downward direction, and wherein each mobile antenna transmits and receives a horizontally polarized radio wave in a direction perpendicular to a direction of travel of said vehicle, a vertically polarized radio wave in the direction of travel of said vehicle, and a radio wave polarized in the direction of travel of said vehicle in an upward direction of said vehicle.
References Cited (Backward Citations)
No citation records indexed.
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