Communications: directive radio wave systems and devices (e.g. – Radar transponder system – With telemetry
Patent
1994-02-10
1996-05-14
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
With telemetry
342 42, 34082554, G01S 1374
Patent
active
055171940
ABSTRACT:
A passive RF transponder incorporating a non-volatile memory element is powered by inductive coupling to a proximately located RF controller. A communication system and method is disclosed which utilizes the controller to send data and commands to the transponder by means of an FSK modulated RF signal in order to cause the transponder to either read selected data from, or write selected data to, the non-volatile memory and transmit the same back to the controller utilizing PSK modulation. The communication system and method may be operated in either full duplex or half duplex modes of operation with the controller causing the transponder to simultaneously write data to its non-volatile memory array as the contents are read out and transmitted to the controller by complementing selected bits thereof.
REFERENCES:
patent: 3713148 (1973-01-01), Cardullo et al.
patent: 4926187 (1990-05-01), Sugawara et al.
patent: 5374930 (1994-12-01), Schuermann et al.
patent: 5430447 (1995-07-01), Meier
Ramtron Corporation, R2 92490, Ramtron Brochure, RTx 0801 Ramtag.TM., 256-Bit Passive Nonvolatile RF/ID Tag Engineering Prototype, 1990, pp. 1-6.
Ramtron International Corporation, Ramtron Brochure, FM1208S FRAM.RTM.Memory, 4,096-Bit Nonvolatile Ferroelectric RAM Product Specification, R3 Aug., 1993, pp. 1-8.
Carroll Gary T.
Pauley J. Donald
Kubida William J.
Lobo Ian J.
Racom Systems, Inc.
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