Impinj, Inc.

Joshua F Ensworth

Alberto Pesavento

Harley K Heinrich

Theron Stanford

Thomas G Anderl

Adrian Wojnowski

RFID tag ICs in a population can adjust the impedance values used to backscatter-modulate reply signals to increase the distribution or spread of backscattered signal parameters, thereby facilitating the recovery of collided tag replies. An RFID tag IC may adjust its impedance value(s) based on a reader command or independently.

Controlling RFID tag population backscatter characteristics

Portals and other chokepoints can be monitored with RFID reader systems. A portion of an RFID reader system capable of generating multiple beams can be mounted between two adjacent chokepoints such that some beams are associated with one chokepoint while other beams are associated with the other chokepoint. When replies from an item are received, the item can be associated with a chokepoint based on parameters or characteristics associated with the replies and/or the beam(s) on which the replies are received. If the detected item is moving, its movement direction through the chokepoint and/or its movement speed may also be determined.

Growing community of inventors

Bothell, WA, United States of America

Joshua F Ensworth