| 摘要 |
PROBLEM TO BE SOLVED: To reduce the interference of plural road side machines of adjacent lanes and the radio interference between a first road side machine antenna and a second road side machine antenna, to improve the frequency selection precision of an on-vehicle machine, and to improve the reliability of communication with respect to communication between road side machines and the on- vehicle machine in an automatic toll reception system for toll road which automatically receives the toll of the vehicle running on a toll road without stopping it at a toll house. SOLUTION: An antenna housing 6 including a road side machine antenna is shaken in the breadthwise direction of the vehicle by a shake part 7 to vary the relation with the irradiation pattern from road side machine antennas of adjacent lanes or the interference pattern due to shapes of a large-sized vehicle or the toll house temporally and spatially. Thus, frequency selection error of the on-vehicle machine due to the interference of plural road side machines can be reduced to improve the reliability of communication between the on- vehicle machine and road side machines. |
