发明授权
- 专利标题: Antenna and transmitter arrangement for EAS system
- 专利标题(中): EAS系统的天线和发射机布置
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申请号: US985941申请日: 1997-12-05
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公开(公告)号: US5963173A公开(公告)日: 1999-10-05
- 发明人: Ming-Ren Lian , Thomas P. Solaski
- 申请人: Ming-Ren Lian , Thomas P. Solaski
- 申请人地址: FL Boca Raton
- 专利权人: Sensormatic Electronics Corporation
- 当前专利权人: Sensormatic Electronics Corporation
- 当前专利权人地址: FL Boca Raton
- 主分类号: G08B13/24
- IPC分类号: G08B13/24 ; H01Q7/00 ; H01Q7/04 ; H01Q11/14 ; H01Q21/30 ; H01Q11/12
摘要:
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.
公开/授权文献
- US5268743A Apparatus for measuring flatness of outer lead 公开/授权日:1993-12-07