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US 5,963,173 AGranted
Antenna and transmitter arrangement for EAS system
AssigneeSensormatic Electronics Corporation
InventorsMing-Ren Lian, Thomas P. Solaski
Life of this patent
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AssigneeSensormatic Electronics Corporation
InventorsMing-Ren Lian, Thomas P. Solaski
Estimating the term…
An antenna system for an electronic article surveillance system, comprising: a first, tunable transmitting loop; a second, tunable transmitting loop, the first and second transmitting loops being arranged for first and second modes of operation, the transmitting loops being field-coupled to one another such that tuning the antenna system for one of the modes of operation detunes the antenna system for the other mode of operation; a tunable compensation coil field-coupled to each of the first and second transmitting loops, the tunable compensation coil enabling the antenna system to be tuned for operation in one of the modes at a first resonant frequency, and despite the detuning, enabling the antenna system to be tuned for operation in the other of the modes at a second resonant frequency independently of the tuning for the first mode of operation. The first and second resonant frequencies can be the same as or different from one another. One of the first and second modes of operation is as an in-phase rectangular loop and the other of the first and second modes of operation is as a "figure-8". The compensation loop encircles the first and second transmitting loops.
An antenna system for an electronic article surveillance system, comprising:
A method for tuning an antenna system for an electronic article surveillance system, having first and second transmitting loops the method comprising the steps of:
A method for tuning an antenna system for an electronic article surveillance system, the antenna system having first and second transmitting loops field-coupled to one another, the method comprising the steps of:
Dependencies are inferred from the claim text.