Systems and methods for compensation of interference in radiofrequency identification (RFID) devices
First Claim
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1. A radiofrequency identification (RFID) antenna structure comprising:
- an antenna for use in an RFID device, the antenna comprising a plurality of loops configured to receive a signal from a source;
one or more additional inductive loops that are physically separated from the plurality of loops;
a switching arrangement coupled with the one or more additional inductive loops; and
a controller configured to control the switching arrangement to selectively switch the one or more additional inductive loops to inductively couple the one or more additional loops with the plurality of loops of the antenna to change an inductance of the antenna based on a surrounding conducted environment.
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Abstract
Systems and methods for compensating for interference in radiofrequency identification (RFID) devices are provided. One system includes an RFID antenna structure having a fixed antenna having a plurality of loops, one or more additional inductive loops and a switching arrangement coupled with the one or more additional inductive loops. The RFID antenna structure further includes a controller configured to control the switching arrangement to selectively switch the one or more additional inductive loops to change an inductance of the fixed antenna.
31 Citations
20 Claims
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1. A radiofrequency identification (RFID) antenna structure comprising:
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an antenna for use in an RFID device, the antenna comprising a plurality of loops configured to receive a signal from a source; one or more additional inductive loops that are physically separated from the plurality of loops; a switching arrangement coupled with the one or more additional inductive loops; and a controller configured to control the switching arrangement to selectively switch the one or more additional inductive loops to inductively couple the one or more additional loops with the plurality of loops of the antenna to change an inductance of the antenna based on a surrounding conducted environment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radiofrequency identification (RFID) reader comprising:
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a frequency generator configured to generate a carrier frequency signal; an LC-matching circuit coupled to an output of the frequency generator; an antenna system coupled to an output of the LC-matching circuit, the antenna system comprising; an antenna, and one or more switchable inductive coils; and a controller coupled with the antenna system and configured to control the one or more switchable inductive coils to inductively couple, while being physically separated from, the one or more switchable inductive coils with the antenna based on a surrounding conducted environment affecting an impedance of the antenna system of the RFID reader. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for compensating for a conducted environment in radiofrequency identification (RFID), the method comprising:
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providing a signal to an antenna; and selectively switching one or more inductive loops to resonantly couple, while being physically separated from, the one or more inductive loops with the antenna of an RFID device to change the resonant operation of the antenna based on the conducted environment. - View Dependent Claims (18, 19, 20)
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Specification