Radio communication system between a vehicle and a roadside station
First Claim
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1. A radio communication system for a vehicle traveling on a road, comprising:
- a mobile station provided on said vehicle; and
a stationary station communicating with said mobile station, said stationary station including at least one pair of antennas located with said road therebetween, each antenna of said pair comprising an elongated loop antenna extending along a longitudinal direction of said road such that a flat plane formed by a loop of one of said antennas faces a flat plane formed by a loop of the other one of said antennas;
wherein said pair of antennas generate an electric field having a substantially uniform intensity along the length of the elongated loop antenna and across the width of said road and each antenna of said pair contains an identical transmission signal having identical phase information.
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Abstract
A radio communication system between a mobile station on a vehicle and a stationary station in which a uniform field intensity is obtained in a direction of a width of a road so that a good communication can be performed irrespective of a position of the vehicle on the road. A mobile station is provided on the vehicle. A stationary station communicating with the mobile station includes at least one pair of antennas located with the road therebetween so that the antennas generate an electric field having a substantially uniform intensity in a direction of a width of the road.
12 Citations
13 Claims
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1. A radio communication system for a vehicle traveling on a road, comprising:
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a mobile station provided on said vehicle; and a stationary station communicating with said mobile station, said stationary station including at least one pair of antennas located with said road therebetween, each antenna of said pair comprising an elongated loop antenna extending along a longitudinal direction of said road such that a flat plane formed by a loop of one of said antennas faces a flat plane formed by a loop of the other one of said antennas; wherein said pair of antennas generate an electric field having a substantially uniform intensity along the length of the elongated loop antenna and across the width of said road and each antenna of said pair contains an identical transmission signal having identical phase information.
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2. A radio communication system for a vehicle traveling on a road, comprising:
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a mobile station provided on said vehicle; and a stationary station communicating with said mobile station, said stationary station including a plurality of antenna pairs, each antenna of said plurality of antenna pairs being located with said road therebetween, each antenna pair consecutively arranged along a longitudinal direction of said road and having carrier waves with phases that differ from carrier wave phases of adjacent antenna pairs; wherein said plurality of antenna pairs generates an electric field having a substantially uniform intensity along the length of said consecutively arranged antennas and across the width of said road. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio communication system for a vehicle traveling on a road, comprising:
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a mobile station provided on said vehicle; and a stationary station communicating with said mobile station, said stationary station including at least one pair of antennas located with said road therebetween, each antenna of said pair comprising an array antenna containing a plurality of loop antennas arranged along a longitudinal direction of said road; wherein said pair of antennas generate an electric field having a substantially uniform intensity along the length of said array antenna and across the width of said road and each antenna of said pair contains an identical transmission signal having identical phase information.
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Specification