发明名称 |
Dual resonant antenna circuit for RF tags |
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.
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申请公布号 |
US5317330(A) |
申请公布日期 |
1994.05.31 |
申请号 |
US19920957119 |
申请日期 |
1992.10.07 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
EVERETT, DAVID F.;BUCK, DANIEL C. |
分类号 |
H04B5/02;G01S13/75;G06K17/00;G06K19/07;(IPC1-7):H01Q21/00;G08B13/24 |
主分类号 |
H04B5/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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