Automatic tuning reader
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United States of America Patent
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Jul 10, 2012
Grant Date -
Apr 23, 2009
app pub date -
Oct 20, 2008
filing date -
Oct 19, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method of automatically tuning a reading device that remotely monitors RFID tags or transponders. The reading device utilizes the phase signal of an antenna signal wherein the harmonic of the antenna signal is filtered through a signal coupling transformer and utilizes the antenna current reading to determine the optimal capacitance setting for the reader by adjusting capacitors and storing the relative phase signal and level of current in a processor. In one embodiment, the method comprises supplying power to the reading device, monitoring the power supply, storing data related to the monitored power supply, emitting a signal from an antenna, filtering the harmonic of such signal, outputting the phase signal to a processor and adjusting capacitors based on the phase signal and monitored current.
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