Antenna for reducing an effect of a radio wave blocking obstacle
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United States of America Patent
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-
Sep 14, 1999
Grant Date -
N/A
app pub date -
Aug 8, 1996
filing date -
Aug 24, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An array antenna is located on an upper surface of a vehicle. The array antenna is oriented at a right angle to a radio wave blocking obstacle existing in a radio wave transmission path. A diffracted wave is effectively received at the shadowed portion where a direct wave is not transmitted because of the radio wave blocking obstacle. If the antenna dimension of its longitudinal direction is larger than that of the radio wave blocking obstacle, both direct wave and diffracted wave are received and therefore the reception power decrease caused by the radio wave blocking obstacle is further reduced.
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