Invention Grant
US07808389B2 Data transmission method and a RFID reader provided with a coil and a control circuit for field quenching outside of a communication area
有权
数据传输方法和设置有线圈的RFID读取器和用于在通信区域外的场淬灭的控制电路
- Patent Title: Data transmission method and a RFID reader provided with a coil and a control circuit for field quenching outside of a communication area
- Patent Title (中): 数据传输方法和设置有线圈的RFID读取器和用于在通信区域外的场淬灭的控制电路
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Application No.: US11886426Application Date: 2006-03-13
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Publication No.: US07808389B2Publication Date: 2010-10-05
- Inventor: Klaus Finkenzeller
- Applicant: Klaus Finkenzeller
- Applicant Address: DE Munich
- Assignee: Giesecke & Devrient GmbH
- Current Assignee: Giesecke & Devrient GmbH
- Current Assignee Address: DE Munich
- Agency: Bacon & Thomas, PLLC
- Priority: DE102005011611 20050314
- International Application: PCT/EP2006/002278 WO 20060313
- International Announcement: WO2006/097259 WO 20060921
- Main IPC: G08B13/14
- IPC: G08B13/14
Abstract:
The present invention relates to a method, a reading device and a system for transmitting data and/or energy between a reading device and a transponder unit. Via a first antenna coil of the reading device generating a first magnetic field data and/or energy are transmitted to the transponder unit. By means of a second antenna coil a second magnetic field with opposite sign is generated. Within a near field or communication range (12) of the reading device the second magnetic field is weaker than the first magnetic field. In a tap-proof range (13), i.e. outside the near field, the two magnetic fields have the same absolute value and cancel each other out due to the opposite signs.
Public/Granted literature
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