1
Josef H Schuermann, Guenter Heinecke, Rudolf Kremer: Transponder arrangement. Texas Instruments Deutschland, James C Kesterson, James T Comfort, Melvin Sharp, October 1, 1991: US05053774 (522 worldwide citation)

A transponder arrangement is described comprising an interrogation unit (10) which sends an RF interrogation pulse to at least one responder unit (12). The responder unit (12) then transmits back data stored therein in the form of a modulated RF carrier to the interrogation unit (10). In the respond ...


2
Herbert Meier: Transponders, Interrogators, systems and methods for elimination of interrogator synchronization requirement. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, July 30, 1996: US05541604 (326 worldwide citation)

A Radio Frequency Identification (RFID) system having an interrogator (12) and a transponder (14). The interrogator has a first tuned circuit (28) of a powering frequency for sending a powering burst to a transponder (14), a filter/demodulator (64) for receiving an wireless, modulated RF response fr ...


3
Thomas J Flaxl: Automatic antenna tuning method and circuit. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, February 13, 1996: US05491715 (244 worldwide citation)

A method of matching the resonant frequency of an antenna resonant circuit (18, 46) to the output frequency of a transmitter output stage (26), the method includes the step of providing a powering signal from the transmitter output stage (26) to the antenna resonant circuit (18, 46). The method furt ...


4
Josef H Schuermann: Integrated vehicle communications system. Texas Instruments Deutschland, Bret J Petersen, James C Kesterson, Richard L Donaldson, September 3, 1996: US05552789 (230 worldwide citation)

An integrated vehicle communications system for on-board use within a vehicle which may also communicate with external portions of the system which includes miniaturized, self-contained read/write transponders 20, 22, 30 of the type disclosed in Schuermann U.S. Pat. No. 5,053,774, for providing func ...


5
Josef H Schuermann: High speed read/write AVI system. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, December 20, 1994: US05374930 (227 worldwide citation)

A transponder (14) for communicating with an interrogator (12) has a high Q-factor resonant circuit (34) of frequency f.sub.1 for receiving RF powering signals. The transponder also has a tuning circuit (56,58) which when in electrical communication with the resonant circuit (34) is operable to form ...


6
Kurt Orthmann, Andreas Hagl: Apparatus and method for identifying multiple transponders. Texas Instruments Deutschland, James C Kesterson, Richard L Donaldson, Rene E Grossman, February 6, 1996: US05489908 (174 worldwide citation)

Apparatus and method for identifying a plurality of transponders (10-16) located within an inquiry field (18) of an interrogation unit (20) are provided. Each transponder (10-16) is assigned an unique identification code, and the interrogation unit (20) dynamically constructs and modifies a bit stri ...


7
Guenther Froschermeier: Method and system for conserving power in a recognition system. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, June 11, 1996: US05525992 (150 worldwide citation)

A system and method for avoiding the discharge of a battery or otherwise excessive power consumption by a transponder (14) in the presence of a spurious noise source. In a described embodiment, the transponder (14) renders itself immune to activation by presence of RF energy for some period if the t ...


8
Loek D Hont, Anne Tip, Herbert Meier: Transponder systems for automatic identification purposes. Texas Instruments Deutschland, Texas Instruments Holland, Brian C McCormack, James C Kesterson, Richard L Donaldson, September 26, 1995: US05453747 (140 worldwide citation)

A method of communicating between an interrogator (10) and at least a first and second transponder (12). The transponders (12)are separately located within a first and a second vehicle (20) travelling within a first and a second traffic lane, respectively. The method has the steps of providing a fir ...


9
Josef H Schuermann: Frequency diversity transponder arrangement. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, September 13, 1994: US05347280 (131 worldwide citation)

A method of communicating between a transponder and an interrogator. The interrogator (10) transmits a wireless RF interrogation which is received by the transponder (12). The transponder (12) then transmits a wireless RF response. The wireless RF response has a first channel response centered at fr ...


10
Herbert Meier, Martin Sellmeir: Read/write transponder arrangement and method of communication. Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, August 20, 1996: US05548291 (127 worldwide citation)

A transponder arrangement is described having an interrogator unit (10) which transmits at least one RF programming sequence and at least one RF interrogation pulse. The responder unit (12) includes a responder unit receiver (130) for receiving data transmitted by the RF programming sequence from th ...