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1. 发明授权

US5491468A Identification system and method with passive tag 失效
标题翻译：无源标签识别系统和方法
公开(公告)号：US5491468A
公开(公告)日：1996-02-13
申请号：US80843
申请日：1993-06-24
申请人： David F. Everett , John W. Frech , Theodore Wright , Kelly M. Rodriquez
发明人： David F. Everett , John W. Frech , Theodore Wright , Kelly M. Rodriquez
IPC分类号： G06K17/00 , G06K7/00 , G08B21/00
CPC分类号： G06K7/0008
摘要： An identification system with a reading device having a single turn transmission coil for continuously radiating alternating energy. A portable tag receives via a magnetic coupling, the energy from the reader and charges a storage capacitor to 5 volts. The capacitor is discharged rapidly during a time period less than the charging time period. This discharge of the capacitor powers a coded information transmission circuit during a small percentage of the duty cycle.
摘要翻译：具有读取装置的识别系统具有用于连续地发射交替能量的单匝传输线圈。便携式标签通过磁耦合接收来自读取器的能量，并将存储电容器充电至5伏。电容器在小于充电时间段的时间内快速放电。电容器的这种放电在占空比的小百分比中为编码信息传输电路供电。

2. 发明授权

US5317330A Dual resonant antenna circuit for RF tags 失效
标题翻译：用于RF标签的双谐振天线电路
公开(公告)号：US5317330A
公开(公告)日：1994-05-31
申请号：US957119
申请日：1992-10-07
申请人： David F. Everett , Daniel C. Buck
发明人： David F. Everett , Daniel C. Buck
IPC分类号： H04B5/02 , G01S13/75 , G06K17/00 , G06K19/07 , H01Q21/00 , G08B13/24
CPC分类号： G01S13/753 , G01S13/758 , G06K19/0723
摘要： A two-way communication system is provided having a stationary device and a portable passive device. The portable passive device has circuitry for storing and transmitting coded information. The stationary member transmits a signal at a first frequency via magnetic field and the portable passive device transmits coded information stored on circuitry provided therein at a second frequency also via a magnetic field. An antenna circuit is provided in the portable passive device having a parallel resonant circuit and a series resonant circuit. The parallel resonant circuit derives operating power from the signal at a first frequency for use in the circuitry provided in the portable passive device. The series resonant circuit transmits coded information at a second frequency.
摘要翻译：提供了具有固定装置和便携式无源装置的双向通信系统。便携式无源设备具有用于存储和发送编码信息的电路。固定构件通过磁场发送第一频率的信号，并且便携式无源装置也通过磁场以第二频率发送存储在其中提供的电路上的编码信息。在具有并联谐振电路和串联谐振电路的便携式无源器件中设置有天线电路。并联谐振电路从在第一频率的信号中导出工作功率，用于在便携式无源器件中提供的电路中使用。串联谐振电路以第二频率发送编码信息。

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