| 摘要 |
PROBLEM TO BE SOLVED: To avoid, in advance, an antenna gain from being reduced by existence of wipers. SOLUTION: As a vehicle moves on an electric field strength distribution generated by combining a direct wave directly coming from an on-road unit antenna to an ETC antenna and a scattered wave coming from the on-road unit antenna through wipers to the ETC antenna, an electric field strength on a locus where the ETC antenna moves, is acquired, the acquired electric field strength is converted into antenna reception power and a position where an operation area, in which the converted antenna reception power becomes a threshold value or more, becomes maximum, is determined as an optimal mounting position of the ETC antenna. COPYRIGHT: (C)2009,JPO&INPIT
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