Interrogators, methods of operating a coherent interrogator, backscatter communication methods, interrogation methods, and signal processing methods
R Greeff, DK Ovard - US Patent 7,091,828, 2006 - Google Patents
The present invention includes phase shifters, interrogators, methods of shifting a phase
angle of a signal, and methods of operating an interrogator. One aspect of the present …
angle of a signal, and methods of operating an interrogator. One aspect of the present …
Track to train communication systems
MS Sutton - US Patent 5,055,835, 1991 - Google Patents
57 ABSTRACT A transponder circuit comprises a loop (4) for induc tively coupling with an
interrogator (2) to transmit a binary coded message to the interrogator (2); the loop (4) forms …
interrogator (2) to transmit a binary coded message to the interrogator (2); the loop (4) forms …
Identification system
HS Katzenstein - US Patent 4,752,776, 1988 - Google Patents
57 ABSTRACT A reader identifies information, such as the identity of an object at a
transponder, provided in binary form by the transponder. The reader initially generates a …
transponder, provided in binary form by the transponder. The reader initially generates a …
Dual standard RF-ID system
J Schuermann - US Patent 5,451,958, 1995 - Google Patents
US5451958A - Dual standard RF-ID system - Google Patents US5451958A - Dual standard
RF-ID system - Google Patents Dual standard RF-ID system Download PDF Info Publication …
RF-ID system - Google Patents Dual standard RF-ID system Download PDF Info Publication …
Communication device and method (s)
DR Brooks, GA Murdoch - US Patent 5,485,154, 1996 - Google Patents
The present invention relates to the areas of communication and/or identification of remote
devices (active or passive). The invention has application where there is a need to identify or …
devices (active or passive). The invention has application where there is a need to identify or …
Communications Device, Apparatus and System
M Borret, C Brooks, A Hills, H Huomo - US Patent App. 11/886,530, 2009 - Google Patents
0003. One such system is generally known as a near field RFID (Radio Frequency
Identification) system, and employs a near field RFID tag and a near field RFID reader for …
Identification) system, and employs a near field RFID tag and a near field RFID reader for …
Apparatus and method for identification of objects
E Diamant - US Patent 4,517,563, 1985 - Google Patents
An object identification system comprising an active transponder including a high frequency
generator, and a passive transponder including a resonance circuit receiving energy from …
generator, and a passive transponder including a resonance circuit receiving energy from …
Transponder arrangement
JH Schuermann - US Patent 5,451,959, 1995 - Google Patents
A transponder system comprises an interrogation unit for communicating with a plurality of
responder units. At least one responder unit receives an interrogation signal from the …
responder units. At least one responder unit receives an interrogation signal from the …
Electronic reader for reading a special characteristic of an object
KJ Geiszler, RE Walker, KA Whiston, J Kwong… - US Patent …, 2003 - Google Patents
An object identification system and method detects the presence of a target object in a field
of inspection and in one aspect of the invention, generates a first signal if the object is left in …
of inspection and in one aspect of the invention, generates a first signal if the object is left in …
Pseudo-passive transponder device
DA Paschen - US Patent 5,822,683, 1998 - Google Patents
The present invention relates to a wireleSS transponder System which is capable of
overcoming Some of the limi tations of past Systems. The transponder System includes a …
overcoming Some of the limi tations of past Systems. The transponder System includes a …