Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1993-11-08
1995-05-16
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 43, 342 51, G01S 1374
Patent
active
054164869
ABSTRACT:
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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Koert Peter
Machina Mark
Metze George M.
APTI Inc.
Hellner Mark
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