1
Mervin L Grindahl, George Rosar, Mark Kodet: Remotely interrogated transponder. E F Johnson Company, Dorsey & Whitney, November 22, 1988: US04786903 (58 worldwide citation)

A radio frequency transponder is provided that combines high signal sensitivity in the receive mode and variable frequency capability in the transmit mode in a low component and power efficient design. A single tuned amplifier acts as the externally quenched oscillator of a superregenerative receive ...


2
Michael John Hamel, Steven W Arms, Christopher P Townsend: Remotely Powered and Remotely Interrogated Wireless Digital Sensor Telemetry System with a Plurality of Transponders Connected to a Single Receiver Coil or Antenna. September 15, 2011: US20110221569-A1

An electronic system includes a reader and a remotely powered and remotely interrogated transponder. The transponder includes a plurality of transponders connected to a single radiation receiving device. Each of the transponders receives power derived from radiation from the reader. Each of the tran ...