Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Keiji Tanaka0
Tadashi Araki0
Akihiro Kamemura0
Kenji Kutsuki0
Date of Patent
October 23, 2007
0Patent Application Number
108119010
Date Filed
March 30, 2004
0Patent Primary Examiner
Patent abstract
Road transmission antennas (4a, 4b) are disposed along a road, each radiating a single cell (E) with electromagnetic waves at the same frequency and of the same content. A vehicle mounted device (3) receiving the waves from the road transmission antennas (4a, 4b) performs antenna pattern diversity reception. When entering a wave blocking area of a large vehicle, a small vehicle is provided with seamless communications with a stationary station.
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