Single-antenna vehicle transponder with a power-save function
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United States of America Patent
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Mar 12, 2013
Grant Date -
Apr 5, 2012
app pub date -
Oct 4, 2011
filing date -
Oct 5, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Embodiments of the present invention relates to a vehicle transponder comprising an active radio unit, an antenna, a wake-up unit and a power directing means which has a first port, a second port and a third port, where the power directing means is arranged to direct power from the first port to the second port and/or the third port. The antenna is connected to the first port and the second port is connected to the radio unit. Furthermore, the third port is connected both to a power detection port at the radio unit and to the wake-up unit, such that during a first mode of operation, a part of a signal that is transmitted from the radio unit to the antenna is coupled from the second port to the third port and further fed to the power detection port.
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