Inductive radio communication system
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United States of America Patent
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-
Aug 20, 1996
Grant Date -
N/A
app pub date -
Jan 27, 1995
filing date -
Jan 28, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An inductive radio communication system in which two sets of parallel lines are provided so as to be separated from each other at a predetermined distance therebetween along the track of a mobile unit, and a loop antenna having a double loop structure and attached on the mobile unit is disposed between the two sets of parallel lines. The loop antenna is arranged such that currents flow in the respective loops in opposite directions to each other at a certain instant. Levels of signals transmitted from the loop antenna to the parallel lines through electromagnetic coupling are added to each other when the signal levels are applied to the primary side of a level converting transformer, and then the output of the transformer is transmitted to a receiver of the ground station side, whereby the undesirable noises radiated to the outside is reduced and the coupling level between the antenna and the parallel lines through electromagnetic coupling is improved.
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