Merchandise surveillance system antenna and method
AssigneeSensormatic Electronics Corporation
InventorsJack Howard Schneider, Brent Franklin Balch
Life of this patent
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Abstract
Embodiments of the invention provide a method, system and apparatus for detecting a merchandise marker in which a first antenna has a circuit having a first loop defining a first area and a second loop defining a second area substantially coplanar with the first area. A second antenna is substantially coplanar and orthogonally positioned with respect to the first antenna. The second antenna has a circuit having a third loop defining a third area and a fourth loop defining a fourth area substantially coplanar with the third area.
Claims20
A transceiver for detecting a merchandise marker, comprising:
- a first antenna comprising a first circuit having a first loop defining a first area and a second loop defining a second area substantially coplanar with the first area;
- and
- a second antenna substantially coplanar and orthogonally positioned with respect to the first antenna, the second antenna comprising a second circuit having a third loop defining a third area and a fourth loop defining a fourth area substantially coplanar with the third area, the second antenna being configured to receive a driving signal that is different from a driving signal received by the first antenna.
A method for detecting a magneto-acoustic marker, comprising:
- producing a first magnetic field by sending a current in a first direction through a first transceiver antenna, the first transceiver antenna having a first loop defining a first area and a second loop defining a second area substantially coplanar with the first area;
- producing a second magnetic field by sending a current in a second direction through a second transceiver antenna having a third loop defining a third area and a fourth loop defining a fourth area substantially coplanar with the third area, the second transceiver antenna being substantially coplanar and orthogonally positioned with respect to the first transceiver antenna, the second antenna being configured to receive a driving signal for the current that is different from a driving signal for the current received by the first antenna;
- and
- detecting the magneto-acoustic marker by receiving a signal from the first or the second antenna.
A system for detecting a magneto-acoustic merchandise marker, comprising:
- a first antenna comprising a first circuit substantially having a figure-eight shape;
- a second antenna comprising a second circuit substantially having a figure-eight shape, wherein the first antenna is substantially coplanar and orthogonally positioned with respect to the second antenna, the second antenna being configured to receive a driving signal that is different from a driving signal received by the first antenna;
- a controller for sending a current through the first antenna and the second antenna;
- and
- a detector for detecting the magneto-acoustic merchandise marker via the first or second antenna.
Dependencies are inferred from the claim text.