University of Washington

Belkin International, Inc.

Ricoh Company, Ltd.

Duke University

Searete LLC

Georgia Tech Research Corporation

The Invention Science Fund I LLC

Thingmagic, Inc.

Trimble Navigation Limited

Transform Sr Brands LLC

Sears Brands, LLC

Dirac Solutions, Inc.

Roche Diabetes Care, Inc.

F. Hoffmann-la Roche Ag

Matthew Stephen Reynolds

Shwetak N Patel

Daniel Arnitz

Guy Shlomo Lipworth

Yaroslav Aleksandrovich Urzhumov

Joseph Hagerty

Russell J Hannigan

Sergey Chemishkian

Jonathan J Hull

Karthik Yogeeswaran

Ken Gudan

Gregory D Abowd

Sidhant Gupta

Yael Gregory Maguire

Thomas M Robertson

Joshua F Ensworth

Ravikanth Pappu

Clarence T Tegreene

Jeffrey A Bowers

Bernd Schoner

David R Nash

Gabriel Adam Cohn

Francis Michael Kelly

Kenneth F Gudan

Lawrence Frederick Arnstein

Patrick William Vilbrandt

Erich Peter Stuntebeck

Ulrich Haueter

Harvey B Buck, Jr

Harry F Tsai

Sumukh N Pathare

E Rehmatulla Post

Joseph L Richards

Andreas Pedross-Engel

Farid U Dowla

Faranak Nekoogar

Scott Avram Lefton

Richard E Twogood

Charles Gillen-O'Neel

Claire Watts

Frank Kelly

Timothy Brewer

Jeffrey W Garb

Joshua Seal

Steven Gray

Ameet V Joshi

Ulrike Kamecke

Christian Hof

Fritz Hindelang

Sandamali Devadithya

Khai N Truong

Michael Lukin

Stewart Thomas

Jeffery Garb

Stacy Tantum

Yaroslav A Urhumov

Joachim Kasielke

James D Rosenthal

Alexander Tung Hoang

Timon Kasielke

Shweatk N Patel

Joseph A Hagerty

Michael Loukine

Examples of imaging systems are described herein which may implement microwave or millimeter wave imaging systems. Examples described may implement partitioned inverse techniques which may construct and invert a measurement matrix to be used to provide multiple estimates of reflectivity values associated with a scene. The processing may be partitioned in accordance with a relative position of the antenna system and/or a particular beamwidth of an antenna. Examples described herein may perform an enhanced resolution mode of imaging which may steer beams at multiple angles for each measurement position.

Millimeter wave and/or microwave imaging systems and methods including examples of partitioned inverse and enhanced resolution modes and imaging devices

A motion sensor assembly may include a cover plate configured to be mounted to an electrical box. The cover plate may include a front surface configured to face away from the electrical box and a rear surface opposite the front surface. The cover plate may further include an aperture configured to receive a toggle or rocker type switch. A motion sensor may be coupled to the cover plate. A power source and processor may be operably coupled to the motion sensor. Furthermore, the processor may be operably coupled to a communication device.

Sensors for detecting presence, occupancy, and/or motion and related systems and methods

Examples of active millimeter-wave imaging systems are described which may utilize modulation schemes to provide illumination signals. The use of modulation techniques may allow for the use of direct-conversion receivers while retaining an ability to separate desired received signal from self-jamming and/or DC offset signal(s) generated by the direct-conversion receivers. In some examples, modulation schemes include the use of balanced orthogonal codes which may support MIMO or massive MIMO imaging systems.

Millimeter wave imaging systems and methods using direct conversion receivers and/or modulation techniques

Examples of digital architectures for OFDM backscatter communication are described herein that use RF switches and discrete loads to implement digitally controlled single-sideband OFDM backscatter devices. One or more transforms may be implemented, including one or more IFFTs, LUTs, and/or numerically-controlled oscillators using one or more sine LUTs.

Backscatter devices and systems having digital architectures for OFDM backscatter

Systems and methods are described herein for providing wireless power to a mobile device, such as an aerial mobile device like an unmanned aerial vehicle (UAV). A navigational constraint model may prescribe a navigation path along which a wireless power transmission system can provide wireless power to the mobile device. Deviations from the prescribed path may require the mobile device to self-power. The prescription of a navigation path allows for the use of reduced-complexity wireless power transmitters that are fully capable of servicing the prescribed path. Multiple embodiments of prescribed paths with various limitations and features are set forth herein, along with multiple embodiments of wireless power transmission systems of reduced complexity and functionality to fully service the various embodiments of prescribed paths.

Wireless power transfer along a prescribed path

Examples described herein include devices and methods that may facilitate interoperability between backscatter devices and wireless communication devices. For example, backscatter devices and methods for backscattering are described that provide a transmitted backscattered signal formatted in accordance with a wireless communication protocol (e.g. Bluetooth Low Energy, WiFi, IEEE 802.11, or IEEE 802.15.4). Such communication may reduce or eliminate any modifications required to wireless communication devices necessary to receive and decode backscattered signals.

Devices and methods for backscatter communication using one or more wireless communication protocols including Bluetooth low energy examples

The present technology pertains to a system and method of operation of a metamaterial phase shifter having various use applications. In one aspect of the present disclosure, a phase shifter includes a network of tunable impedance elements and a controller. The controller is coupled to the network of tunable impedance elements and configured to receive a phase shift input value and determine a corresponding tuning voltage to be supplied to each tunable impedance element of the network of tunable impedance elements based on the phase shift input value, the network of tunable impedance element being configured to shift a phase of an input signal based on tuning voltages supplied to the network of tunable impedance elements by the controller.

Metamaterial phase shifters

An embodiment of an antenna configured to form a high-power beam, such as a battery-charging beam, includes a transmission structure, signal couplers, amplifiers, and antenna elements. The transmission structure (e.g., a waveguide) is configured to carry a reference signal (e.g., a traveling reference wave), and each of the signal couplers is configured to generate a respective intermediate signal in response to the reference signal at a respective location along the transmission structure. Each of the amplifiers is configured to amplify, selectively, an intermediate signal from a respective one of the couplers, and each of the antenna elements (e.g., conductive patches) is configured to radiate a respective elemental signal in response to an amplified intermediate signal from a respective one of the amplifiers. In operation, the elemental signals interfere with one another to form a transmission beam, such as a battery-charging, or other high-power, transmission beam.

Waveguide-backed antenna array with distributed signal amplifiers for transmission of a high-power beam

An embodiment of an antenna array includes a cavity, signal couplers, and antenna elements. The cavity is configured to reinforce a reference signal (e.g., a standing reference wave) having a wavelength &#x3bb;, and each of the signal couplers is configured to generate a respective intermediate signal in response to the reference signal at a respective location of the cavity. And each of the antenna elements (e.g., conductive patches) is configured to radiate a respective elemental signal in response to an intermediate signal from a respective one of the signal couplers. In operation, the elemental signals interfere with one another to form a transmission beam. Controlling the cavity to introduce phase differences between the antenna elements can allow a wider pitch between adjacent antenna elements without the need for large, costly phase shifters, where the pitch can approach its theoretical limit of approximately &#x3bb;/

Cavity-backed antenna array with distributed signal amplifiers for transmission of a high-power beam

System and methods are described herein for providing wireless power to a target device, such as a laptop computer, a mobile phone, a vehicle, robot, or an unmanned aerial vehicle or system (UAV) or (UAS). A tunable multi-element transmitter may transmit electromagnetic radiation (EMR) to the target device using any of a wide variety of frequency bands. A location determination subsystem and/or range determination subsystem may determine a relative location, orientation, and/or rotation of the target device. For a target device within a distance range for which a smallest achievable waist of the Gaussian beam of the EMR at an operational frequency is smaller than the multi-element EMR receiver of the target device, a non-Gaussian beamform may be determined to increase efficiency, decrease overheating, reduce spillover, increase total power output of rectenna receivers on the target device, or achieve another target power delivery goal.

Non-Gaussian beamforming for wireless power transfer optimization

Examples of receivers and receiver techniques are described herein. An example system may include a carrier source that may provide a wireless carrier signal and a wireless communication device, separate from the carrier source. The wireless communication device may provide a wireless communication signal containing data. A receiver may include an antenna positioned to receive the wireless carrier signal and the wireless communication signal, a two-port mixer coupled to the antenna and configured to mix the wireless carrier signal and the wireless communication signal to provide an intermediate frequency signal, and a demodulator configured to extract, at least in part, the data from the intermediate frequency signal.

Two-port mixers and systems, receivers, and methods using same

Examples described herein utilize a backscatter signal provided by a wirelessly powered device to estimate channel information, (e.g., a channel transfer function) between the wirelessly powered device and a transmitter system. The channel information may be used to optimize MIMO power transfer for linear as well as nonlinear backscatter devices. Examples of die method 'may shift some or all of the power cost and complexity of coherent channel measurements from the WFD to the transmitters), and allow WPT optimization to milliwatt- or microwatt-class wirelessly powered devices.

Wireless power systems including determination of channel transfer function from backscatter signals

Activity sensing in the home has a variety of important applications, including healthcare, entertainment, home automation, energy monitoring and post-occupancy research studies. Many existing systems for detecting occupant activity require large numbers of sensors, invasive vision systems, or extensive installation procedures. Disclosed is an approach that uses a single plug-in sensor to detect a variety of electrical events throughout the home. This sensor detects the electrical noise on residential power tines created by the abrupt switching of electrical devices and the noise created by certain devices while in operation. Machine learning techniques are used to recognize electrically noisy events such as turning on or off a particular light switch, a television set, or an electric stove. The system has been tested to evaluate system performance over time and in different types of houses. Results indicate that various electrical events can be learned and classified with accuracies ranging from 85-90%.

Detecting actuation of electrical devices using electrical noise over a power line

Growing community of inventors

Seattle, WA, United States of America

Matthew Stephen Reynolds