发明名称 |
Identification/security tag system employing electronic doppler shifting and/or rectenna structure |
摘要 |
An identification/security tag system, including miniaturized tags which can be readily concealed, utilizes a concept of "electronic" Doppler shifting to generate a frequency shifted signal in response to an interrogation signal. The frequency shifted signal is used to identify individual tags. The implementation of electronic Doppler shifting permits the utilization of conventional police/sport radar guns as a combined transmitter and receiver unit, thereby greatly reducing the expense of the system. The high frequency operation of the system permits size of the tag to be significantly reduced with respect to the size of tags used in conventional tag systems. Rectenna circuitry is further employed to eliminate the need for an active power supply in the tag in some applications.
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申请公布号 |
US5416486(A) |
申请公布日期 |
1995.05.16 |
申请号 |
US19930148433 |
申请日期 |
1993.11.08 |
申请人 |
APTI, INC. |
发明人 |
KOERT, PETER;METZE, GEORGE M.;MACHINA, MARK |
分类号 |
G01S13/75;G01S13/78;(IPC1-7):G01S13/74 |
主分类号 |
G01S13/75 |
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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