Antenna apparatus for determining the position of a radio-frequency transponder
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United States of America Patent
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Oct 6, 2015
Grant Date -
Jan 10, 2013
app pub date -
Jul 8, 2011
filing date -
Jul 8, 2011
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Abstract
An antenna apparatus for determining the position of a radio-frequency transponder is provided, comprising a phased array of antennas enabled to transmit and receive power at a given frequency for communicating with a radio frequency (RF) transponder, the phased array being movable; and a phase shifter for providing a phase shift to at least one antenna of the phased array to provide a minima in a main radiated lobe of the phased array, such that when the phased array is moved from a first position, for detecting the RF transponder via the main radiated lobe, to a second position, where a signal from the RF transponder is minimized, a position of the RF transponder determined to be along an axis of the minima in the second position.
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