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Low Cross-Polarization Decade-Bandwidth Ultra-Wideband Antenna Element + Array
Electronically scanned arrays with ultra-wideband (ESA-UWBs) performance are desirable for applications such as multi-functional systems, high-throughput or low-power communications, high-resolution and clutter resilient radar/sensing, and electromagnetic warfare systems. For these applications, Vivaldi arrays are popular for their excellent impedance performance, but do suffer from unintended polarization, which leads to loss of service or reduction of throughput. To correct for these problems, one can add additional feeding circuitry; however, that will add to complexity and cost and reduce bandwidth capability.

This invention improves upon prior art Vivaldi designs, creating an antenna that has: (1) large instantaneous bandwidths; (2) excellent impedance matching; (3) good polarization isolation. Dr. Vouvakis' antenna is also easier to manufacture because the body is made up of smaller disconnected components that are easier to solder and notch than a single long flair Vivaldi of the prior art. Finally, because the design is based on Vivaldi, this antenna invention will be backwards compatible with legacy wideband phased array platforms.

Published: 5/3/2018   |   Inventor(s): Marinos Vouvakis, John Logan, Rickie Kindt
Category(s): Communications & internet, Electronics, Engineering
WearID: RFID Wristband Reader
Advances in RFID technology are opening up a myriad of commercial applications related to identifying and interacting with objects, from home automation and health and wellness to augmented reality and tele-rehabilitation. Passive UHF RFID readers are a particularly attractive option due to their low cost and no maintenance; however, their limited range necessitates the use of many readers to cover a single large room, an expensive and labor-intensive process.

This invention, known as WearID, overcomes the traditional limitations of UHF RFID readers through end-to-end design innovation, optimizing the wearable reader for low power, form-factor, and performance. WearID is able to detect grasping, releasing, touching, and passing near tagged objects.

Published: 5/2/2018   |   Inventor(s): Deepak Ganesan, Ali Kiaghadi, Pan Hu, Jeremy Gummeson
Category(s): Devices & sensors, Communications & internet, Electronics, Engineering, Software & information technology, Healthcare
Methods for Making Ultra-high Strength Multilayer Graphene Materials
This invention provides methods for making ultra-high strength, light-weight multilayer graphene materials.
Published: 12/21/2017   |   Inventor(s): Christos Dimitrakopoulos, Dimitrios Maroudas, Yuxi (nancy) Wang
Category(s): Material science, Engineering, Physical Science, Nanotechnology, Electronics
Ultra-Compact Low-Cost Terahertz Integrated Circuits
Terahertz imaging is becoming an increasingly important non-destructive evaluation method, with biomedical, security, aerospace, and materials characterization applications. However, unlike microwave-based systems, terahertz devices cannot be cheaply mass produced as integrated circuits, limiting their potential.


In this invention, a compact, low-cost terahertz source has been developed that may be easily integrated into several common high-frequency integrated circuit designs, such as microstrip and coplanar waveguide.  In operation, the source, palladium or platinum strips or nanowires, emits terahertz radiation upon Joule heating caused by applying a low frequency voltage. The source is electromagnetically coupled to antennas via integrated circuit techniques, and the terahertz radiation emitting from the antennas is collimated by a silicon lens. The required power to generate the radiation is extremely low, on the order of 15 nW. The UMass Terahertz Laboratory has successfully demonstrated the technology in a number of applications, including characterizing RNA flowing through a nanofluidic channel and imaging the crystalline polymer PHB.

Published: 12/14/2017   |   Inventor(s): Sigfrid Yngvesson, Martin Muthee
Category(s): Nanotechnology, Electronics, Research tools
Novel Systems for Improved Backscatter Tag Communications
A new fully asymmetric backscatter communication protocol where nodes blindly transmit data as and when they sense. This model enables fully flexible node designs, from extraordinarily power efficient backscatter radios that consume barely a few micro-watts to high-throughput radios that can stream at hundreds of Kbps while consuming a paltry tens of micro-watts.



Published: 8/11/2017   |   Inventor(s): Deepak Ganesan, Pan Hu, Pengyu Zhang
Category(s): Communications & internet, Devices & sensors, Electronics, Engineering, Software & information technology
FS Backscatter Communication
The Frequency-Shifted (FS) Backscatter invention promotes practical backscatter communication for ultra-low power on-body sensors by leveraging radios on existing smart phones and wearables. This invention addresses the self-interference from the wireless carrier without relying on built-in capability to cancel or reject the carrier interference.  Utilizing this invention, the tag shifts the carrier signal to an adjacent non-overlapping frequency band and isolates the spectrum of the backscatter signal from the spectrum of the primary signal to enable more robust decoding.
Published: 9/14/2016   |   Inventor(s): Deepak Ganesan, Pengyu Zhang
Category(s): Communications & internet, Devices & sensors, Electronics, Engineering, Software & information technology
Braidio - Assymetric Transceiver for Mobile Devices
Published: 9/14/2016   |   Inventor(s): Deepak Ganesan, Pan Hu
Category(s): Communications & internet, Devices & sensors, Electronics, Engineering, Software & information technology
Ultra-high Strength Multilayer Graphene Materials
This invention relates to the use of single crystalline graphene to create multilayer structures of graphene materials with superior shear strength.
Published: 9/14/2016   |   Inventor(s): Christos Dimitrakopoulos, Dimitrios Maroudas, Andre Muniz, D. Kurt Gaskill
Category(s): Material science, Nanotechnology, Electronics, Engineering, Physical Science
Eye Tracker System for Diagnostics (CIDER)
This invention relates generally to a highly optimized low power wearable eye tracker system for detecting eye parameters including eye movement, pupil center, pupil diameter (i.e., dilation), blink duration, and blink frequency.  The system operates at a ten-fold reduction in power usage as compared to current eye tracker systems and methods. The invention does not require active calibration by the user. The eye parameters may then be used to determine a variety of physiological and psychological conditions in humans.  The eye tracker device includes an imaging component, an illuminator component, a photodiode component and a controller, or special-purpose processor.  The controller may be integrated with the eye tracking device or reside remotely such as within another device such as a mobile device including a tablet or smart phone. The system incorporates a neural network enabling trade-offs between power consumption and robustness to illumination conditions, as well as between sensing and computational modes. The system can operate at very high frame rates (exceeding 100 fps) during typical operation.
Published: 9/13/2016   |   Inventor(s): Deepak Ganesan, Christopher Salthouse, Addison Mayberry, Benjamin Marlin
Category(s): Devices, Electronics, Healthcare, Software & information technology
Efficient Thermoelectric Converters
The invention provides thermoelectric devices similar to conventional Peltier-elements based on folded, multi-layered nanomembranes prepared from 2-dimensional (2D) van der Waals materials. These van der Waals materials (e.g. graphene, hexagonal boron nitride, and transition metal dichalcogenides) have both single atomic layers with strong in-plane covalent bonding and weak bonding across atomic mononolayers. When devices are fabricated by folding monolayers onto themselves and into layered structures (figure). In this configuration, the electric path is shorter and the thermal path is suppressed. Moreover, multiple elements can be combined in series and parallel configurations to produce a useful amount of electricity. Thus, these devices can be used to convert waste-heat into electricity and can also serve a thermoelectric cooler. Some information about different applications here.
Published: 3/8/2016   |   Inventor(s): Zlatan Aksamija, Robert Blick
Category(s): Clean Energy, Devices, Devices & sensors, Electronics, Engineering, Material science, Nanotechnology, Physical Science
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