Intermec IP Corporation

Intermec, Inc.

Rockwell Collins, Inc.

John Jorgenson

Hunter Martin Leland

Johanas L Starr

Tom Schuster

Rene D Martinez

Gary Neal Spiess

Thomas John Schuster

Joseph F Jiacinto

Fengyu Ge

David Eastburn

Jeffrey D Schmidt

Steven R Brown

Timothy S Lappe

A RFID reader RFID reader may include an antenna that outputs signals and receive signals reflected from an object moving relative to the antenna, and circuitry configured to receive the reflected signals from the antenna. The reflected signals may determine that the motion has occurred relative to the antenna or be cancelled using a signal generated based on the reflected signals.

RFID motion triggering

A two-stage high-power RF limiter circuit for an RF signal receiver incorporates a heavy limiting stage to limit high energy pulses of a received RF signal to a desired power threshold over a sustained time period, while a light limiting stage reacts quickly to high energy pulses to reduce spike leakage associated with the slower reaction time of the heavy limiting stage. Both heavy and light limiting stages incorporate PIN diodes biased to a voltage just below the desired power threshold (the light limiter biased to a slightly higher voltage than the heavy limiter) so the PIN diodes do not activate until power levels are high enough to warrant limiting. The holdoff voltage across the PIN diodes is maintained by Zener diodes biased to a voltage corresponding to the power threshold, allowing the PIN diodes to self-bias once the power threshold is reached.

High power RF limiter

A device includes a switch having multiple ports, an antenna coupled to each corresponding port, a tunable matching network coupled between each antenna and each port, and a controller to detune ports having antennas that are not transferring power when a selected antenna is transferring power.

RFID reader antenna port isolation

A system and method is provided for image surveillance of areas of interest for items having radio frequency identification (RFID) tags. These areas of interest are often times unmonitored due to privacy concerns. The present invention discloses an image surveillance system and method, that upon indication of an RFID tag coming within proximity of a portal system having an RFID reader, records one or more images of the area of interest, so as to capture a subject associated with the RFID tagged item moving into or through the area of interest. Such applications for embodiments of the present invention are directed to monitor items of interest in retail stores, restaurants, shipping and receiving locations, and other public areas.

RFID tag reader station with image capabilities

A system and method for detecting the presence of a signal on a channel mixes signals received with an antenna with a local signal having a controllable frequency within a band of frequencies defined by the channel. The local signal is produced with a sequentially adjusted frequency within the channel. The mixing operation (for each local signal frequency) produces an output signal having a frequency indicative of a difference between a frequency of signals received with the antenna and a frequency of the local signal. The output signal is converted to a baseband frequency band, and is then analyzed to determine whether the signals received with the antenna occupy the channel.

System and method for detecting narrow bandwidth signal content to determine channel occupancy

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Cedar Rapids, IA, United States of America

John Jorgenson