Antenna arrangement for RFID smart tags
First Claim
Patent Images
1. An antenna arrangement for detecting a wireless article comprising:
- a first antenna loop disposed in a first plane for transmitting and/or receiving electromagnetic signals;
a first tunable circuit connected to said first antenna loop for coupling at least received signals therefrom;
a second antenna loop disposed at least in part in the first plane and overlapping at least in part said first antenna loop therein, wherein said first and second antenna loops overlap at least in part in the first plane and define a detection region adjacent thereto in which said first and second antenna loops transmit and/or receive electromagnetic signals and in which a wireless article may be;
a second tunable circuit connected to said second antenna loop for coupling at least received signals therefrom; and
a processor coupled to said first and second tunable circuits for processing at least received signals from said first and second antenna loops for detecting a wireless article in detection region.
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Abstract
An antenna arrangement comprises at least two antenna loops disposed and overlapping in a plane to define a detection region adjacent thereto in which the antenna loops transmit and/or receive electromagnetic signals and through which a wireless article may pass. The antenna arrangement may be coupled to a processor and/or utilization system for performing a desired function.
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Citations
25 Claims
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1. An antenna arrangement for detecting a wireless article comprising:
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a first antenna loop disposed in a first plane for transmitting and/or receiving electromagnetic signals;
a first tunable circuit connected to said first antenna loop for coupling at least received signals therefrom;
a second antenna loop disposed at least in part in the first plane and overlapping at least in part said first antenna loop therein, wherein said first and second antenna loops overlap at least in part in the first plane and define a detection region adjacent thereto in which said first and second antenna loops transmit and/or receive electromagnetic signals and in which a wireless article may be;
a second tunable circuit connected to said second antenna loop for coupling at least received signals therefrom; and
a processor coupled to said first and second tunable circuits for processing at least received signals from said first and second antenna loops for detecting a wireless article in detection region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna arrangement for detecting a wireless article in a detection region comprising:
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a first antenna loop disposed in a first plane for transmitting and/or receiving electromagnetic signals;
a first tunable circuit connected to said first antenna loop for coupling at least received signals therefrom;
a second antenna loop disposed at least in part in the first plane and overlapping at least in part said first antenna loop therein, wherein said first and second antenna loops overlap at least in part in the first plane and define a detection region adjacent thereto in which said first and second antenna loops transmit and/or receive electromagnetic signals and in which a wireless article may be;
a second tunable circuit connected to said second antenna loop for coupling at least received signals therefrom; and
electrical conductors connected to said first and second tunable circuits for coupling at least received signals from said first and second antenna loops for detecting a wireless article in the detection region. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for detecting a wireless article in a detection region comprising:
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providing at least first and second loop antennas;
disposing the first loop antenna in a first plane and disposing the second loop antenna at least in part in the first plane, wherein said first and second loop antennas overlap at least in part in the first plane, thereby to define a detection region adjacent thereto in which a wireless article may be;
causing the at least first and second loop antennas to transmit and/or receive electromagnetic signals for signaling with a wireless article in the detection region;
coupling the at least first and second loop antenna and a processor via first and second tunable circuits for receiving signals from the wireless article and/or for transmitting signals to the wireless article; and
processing in the processor the received and/or transmitted signals for detecting a wireless article in the detection region. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An antenna arrangement for detecting a wireless article in a detection region comprising:
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a loop antenna formed of a loop conductor, wherein the loop conductor of said loop antenna is disposed in a plane and crosses over itself at least at three locations in the plane, thereby to define a pretzel-like shape in the plane, wherein said loop antenna defines a detection region adjacent the plane in which detection region said loop antenna transmits and/or receives electromagnetic signals with a component of an associated electromagnetic field in each of three mutually orthogonal directions and in which a wireless article may be;
a processor for providing signals to be transmitted by said loop antenna and for processing signals received from said loop antenna for detecting a wireless article in the detection region; and
a tunable filter circuit for coupling said loop antenna and said processor, whereby signals provided by said processor are transmitted by said loop antenna and signals received by said loop antenna are coupled to said processor for detecting a wireless article in the detection region.
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25. A method for detecting a wireless article in a detection region of a loop antenna comprising:
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providing a loop antenna formed of a loop conductor disposed in a plane and crossing over itself at least twice in the plane, wherein the loop antenna defines a detection region adjacent the plane in which detection region said loop antenna transmits and/or receives electromagnetic signals with a component of an associated electromagnetic field in each of three mutually orthogonal directions and in which a wireless article may be;
causing the loop antenna to transmit and/or receive electromagnetic signals having a component of an associated electromagnetic field in each of three mutually orthogonal directions for signaling with a wireless article in the detection region;
providing a processor;
coupling the loop antenna and the processor for receiving signals from the wireless article and/or for transmitting signals to the wireless article; and
processing the received and/or transmitted signals for detecting a wireless article in the detection region.
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Specification