Dr Gregory D. Durgin (Georgia Tech, USA)
Title: " What RFID Teaches About the Limits of Wireless Power Transfer "
Abstract — There is pent-up demand in the fields of RFID, wireless sensors, and Internet-of-Things devices for enhanced RF energy-harvesting at low received signal levels. In this paper, we build on previous work to derive the fundamental limits of RF energy-harvesting. We then show that current RF harvesting technologies, developed primarily in the RFID industry, still operate many orders-of-magnitude away from these fundamental limits. The possibilities of enhanced devices for emerging applications promises a rich research field for many years to come.
Biography — Gregory D. Durgin joined the faculty of Georgia Tech’s School of Electrical and Computer Engineering in Fall 2003 where he serves as a professor. He received the BSEE (96), MSEE (98), and PhD (00) degrees from Virginia Polytechnic Institute and State University. In 2001 he was awarded the Japanese Society for the Promotion of Science (JSPS) Post-doctoral Fellowship and spent one year as a visiting researcher with Morinaga Laboratory at Osaka University. He has received best paper awards for articles coauthored in the IEEE Transactions on Communications (1998 Stephen O. Rice prize), IEEE Microwave Magazine (2014), and IEEE RFID Conference (2016). Prof. Durgin also authored Space-Time Wireless Channels, the first textbook in the field of space-time channel modeling. Prof. Durgin founded the Propagation Group at Georgia Tech, a research group that studies radiolocation, channel sounding, backscatter radio, RFID, and applied electromagnetics. He is a winner of the NSF CAREER award as well as numerous teaching awards, including the Class of 1940 Howard Ector Outstanding Classroom Teacher Award at Georgia Tech (2007). He has served as an editor for IEEE RFID Virtual Journal, IEEE Transactions on Wireless Communications, and IEEE Journal on RFID. He also serves on the advisory committee on the IEEE Council for RFID (ComSoc Liaison). He is a frequent consultant to industry, having advised many multinational corporations on wireless technology.
Dr Paul Jaffe (U.S. Naval Research Laboratory, USA)
Title: " Comparison of Power Beaming Demonstrations "
Abstract — Advances in both microwave and laser technologies in the past decade promise to yield dividends for power beaming capabilities. Despite this, many of the power beaming demonstrations of greatest note occurred in the 1970s. As transmitter and receiver technologies continue to mature, a clear means of comparing the relative merits of different power beaming demonstrations should be adopted. Herein is outlined a set of possible comparison criteria and parameters of interest to be reported for power beaming demonstrations.
Biography — Dr Paul Jaffe is a researcher, electronics engineer, and integration and testing section head at the Naval Center for Space Technology at the United States Naval Research Laboratory (NRL). In over 24 years at the NRL, he has led or held major roles on dozens of space missions and breakthrough technology development programs for NASA, the National Oceanic and Atmospheric Administration (NOAA), Defense Advanced Research Projects Agency (DARPA), the Office of the Secretary of Defense (OSD), the military services, and other sponsors. These include the Special Sensor Ultraviolet Limb Imager (SSULI), the Solar TErrestrial RElations Observatory (STEREO), TacSat-1, TacSat-4, Operationally Responsive Space (ORS), the Photovoltaic Radiofrequency Antenna Module (PRAM), the Microwave Imager/Sounder (MIS), CARINA, Robotic Servicing of Geosynchronous Satellites (RSGS), Power TRansmitted Over Laser (PTROL), and Space Solar for Forward Operating Bases and Remote Installations (S2FOBs).
He served as the electrical segment lead for the multiple complex space missions, including the Microwave Imager/Sounder (MIS) project. In this capacity he led a large team of hardware and software engineers and managed a budget of nearly $100M in the development of microwave, digital, and analog electronics subsystems for a large radiometer for an operational weather satellite.
Dr Jaffe served as a coordinator of the NRL’s study of the military applications of space solar, and as an editor of the study group’s acclaimed final report. He was the principal investigator for a ground-breaking four-year research effort involving the development and testing of modules for conversion of sunlight into microwaves. The modules have a number of potential applications, including satellites for space solar, and are slated to be tested in space via the Department of Defense’s (DoD) Space Test Program (STP).
As part of his work, Dr Jaffe has authored and presented peer-reviewed scientific papers and articles for international journals and conferences, as well as several patent disclosures. He has been an invited keynote and colloquium speaker, conference presenter, and panelist on many occasions, most recently in relation to space solar and power beaming. He has made presentations to a wide range of audiences on science and technology topics, and has appeared worldwide in television, radio, print, and online media as a science and technology expert, including on MSNBC and the Science Channel’s “Through the Wormhole with Morgan Freeman.” His publications and work with STEM and educational outreach have received numerous awards and recognition. He led the team that took top honors at the Secretary of Defense’s 2016 Defense, Diplomacy, and Development (D3) Innovation Challenge.
For more than 17 years, he has worked with K-12, undergraduate, and graduate students as a tutor and mentor for a range of STEM topics. Many of his student’s projects have received honors and recognition. He serves as a lecturer for the Aerospace Engineering Department at the University of Maryland.
He has received a Bachelor of Science in Electrical Engineering from the University of Maryland, College Park and a Master of Science in Electrical Engineering at the Johns Hopkins University, graduating with honors. He earned a Ph.D. in Electrical Engineering at the University of Maryland, College Park.
Dr Amir Mortazawi (University of Michigan, USA)
Title: " Exploiting Nonlinearity to Design Robust Wireless Power Transfer and Wideband Energy Harvesting "
Abstract — In this paper, the characteristics of a specific class of nonlinear resonators described by a 2nd order nonlinear differential equation with cubic or higher order nonlinearity are explored for the design of position-insensitive wireless power transfer (WPT) and wideband RF wireless energy harvesting (WEH) circuits. The presented position-insensitive WPT circuit is designed to operate efficiently across wide transmission range without tuning the source frequency. As a proof of principle, a WPT and a WEH circuit prototypes employing such nonlinear resonators have been designed and tested. The 20 Watts WPT circuit achieves a power transfer efficiency (PTE) of higher than 80% over a transmission range of 250 mm. A nonlinear resonator can achieve significantly enhanced 3dB bandwidth compared to a linear resonator with the same quality factor. The implemented nonlinear resonator enhances the bandwidth of the High-Q WEH circuit in this paper by 2.7 times compared to the linear one.
Biography — Amir Mortazawi received the Ph.D. degree in electrical engineering from The University of Texas at Austin, in 1990. He is currently a Professor of electrical engineering with The University of Michigan at Ann Arbor. His research interests include microwave and millimeter-wave circuits, phased arrays, power amplifiers, ferroelectric thin film based devices and frequency-agile microwave circuits.
Mortazawi was the Editor-in-Chief for the IEEE Transactions On Microwave Theory And Techniques from 2006-2010. He served on the IEEE Microwave Theory and Techniques Society (IEEE MTT-S) Administrative Committee (AdCom) for eight years. He also served as the Associate Editor for the IEEE Transactions On Antennas And Propagation (1998–2001) and IEEE Transactions On Microwave Theory And Techniques (2005). Mortazawi is a Fellow of IEEE.
Dr Joshua Smith (University of Washington, USA)
Title: " Coil Geometry Optimization for Wireless Power Delivery to Moving Receivers "
Abstract — Wireless power transfer systems have conventionally been modeled and optimized in static configurations, with immobile receivers and transmitters. However, many real-world use cases are not well addressed by this simplified model. In this work, the case of a moving receiver is explored, and transmit coil geometry is optimized for this special case. The optimal design is based on the velocity of the receiver, energy required by the load, Tx-Rx distance, and maximum receiver size. Simplified equations and design procedures are described and analyzed. Coils and receiver hardware are implemented and validate the design. The Tx-Rx ratio of the implemented coil system is 10.8:1 with a 4.5cm receiver coil.
Biography — Joshua R. Smith is a professor of electrical engineering and of computer science and engineering at the University of Washington, where he leads the Sensor Systems Laboratory. He was named an Allen Distinguished Investigator by the Paul G. Allen Family Foundation and he is a Thrust Leader in the NSF Engineering Research Center on Sensorimotor Neural Engineering (CSNE). His research focuses on inventing new sensor systems, devising new ways to power them and developing algorithms for using them. This research has applications in the domains of implanted medical devices, robotics, and ubiquitous computing.
Dr Alessandra Costanzo (University of Bologna, Italy)
Title: " Design of a Miniaturized Omni-Directional RF-to-dc IR-WPT "
Abstract — This paper describes the design and experiments of a 13.56 MHz IR-WPT link with a conformal transmitter (Tx) and a miniaturized (about 1 cubic centimeter) receiver (Rx) suitable for powering implantable devices. The Rx is composed of three receiving coils wrapped around a miniaturized sphere and mutually orthogonal, arranged in such a way that quasi-constant dc-output voltage and efficiency are obtained, regardless of the receiver orientation in 3-D. The conformal transmitter is designed to maximize the coupling coefficient, at a reference distance of 5 cm, and is about 1%. The quasi-constant output voltage is obtained by connecting each Rx coil to its class-E rectifiers, optimized together with the rest of the system, and by series-connecting the dc output ports, thus de-facto removing the dark zones. With a 10-V input source, the dc-output voltage is always above 2.8 V and the efficiency above 13%.
Biography — Alessandra Costanzo (M’99-SM’13) received the laurea-degree with honor in Electronic Engineering from the University of Bologna, Italy, in 1987. Thereafter she joined the University of Bologna as a research associate and she became associate professor in 2001. She has been teaching courses in Electromagnetic Field Theory, Microwaves, Nonlinear Microwave Circuit Design, Numerical Techniques for Electromagnetics and Bioelectromagnetics. She is and has been supervisor of many MS and BS students and tutor of several Ph.D. students.
Her research activities have been dedicated to the development of CAD algorithms for multi-domain co-design and modeling of active nonlinear microwave/RF circuits. These approaches have been extended to the efficient circuit-level design of entire wireless links, including rigorous models of the radiating elements and of the propagation channels. She has carried out designs of MIMO, UWB and RFID systems and of highly innovative multi-band rectennas, specialized for wearable applications. She is now involved in multiple research activities related to the wireless power transmission technologies, adopting both far-field and near-field solutions, for several power needs, operating frequencies and application scenarios, namely powering of energy autonomous sensor nodes and charging of portable devices. She has developed innovative sensing solutions, based on EM interference, for non-invasive structural monitoring. She authored more than 150 scientific publications on peer reviewed international journals and conferences, and several chapter books. All these activities have been carried out in the framework of international research projects and/or in collaboration with private companies. She owns three international patents. Dr. Costanzo is being serving in several committees in the IEEE Microwave Theory and Techniques Society (IEEE MTT-S). She was MTT-26 (Wireless Energy Transfer and Conversion) vice-chair form 2013 to 2015 and chair from 2016 to 2017, she is member of MTT-24 (RFID).
She is Associate Editor of Microwave Theory and Techniques Steering committee chair of the new IEEE Journal on RFID and serves as reviewer for many IEEE Transactions. She is executive editor of the Cambridge Journal of Wireless Power Transmission and of the International Journal of Microwave and Wireless Technologies. She was workshops chair and focus sessions chair for the EuMC2014, where she also organized the IEEE Women in Microwaves event (WIM). She is IEEE MTT-S representative and Distinguished Lecturer in the Council of RFID (CRFID). She was co-founder of the EU COST action IC1301 WiPE “Wireless power transfer for sustainable electronics” where she chairs WG1: “far-field wireless power transfer”.
Dr Zhihua Wang (Tsinghua University, China)
Title: " Enhancement Method of Efficiency and Working Range in Bio-Implant Wireless Power Transfer "
Abstract — An effective control method with improved energy efficiency and extended working range based on 1X/2X reconfigurable rectifier is presented for wireless power transfer in implantable medical devices (IMD). Compared to the conventional method that fixes the duty cycle of the reconfigurable rectifier to be around 50%, the proposed method optimizes the duty cycles for different coupling and loading conditions, so the system efficiency is significantly improved and the workable coupling and loading range is greatly extended. Simulation results in a commercial 0.18 um CMOS technology validate the proposed method
Biography — Zhihua Wang received the B.S., M.S., and Ph.D. degrees in electronic engineering from Tsinghua University, Beijing, China, in 1983, 1985, and 1990, respectively. In 1983, he joined the faculty at Tsinghua University, where he is a Full Professor since 1997 and Deputy Director of Institute of Microelectronics since 2000. From 1992 to 1993, he was a visiting scholar at Carnegie Mellon University. From 1993 to 1994, he was a Visiting Researcher at KU Leuven, Belgium. From September 2014 to March 2015, he was a Visiting professor in Hong Kong University of Science and Technology. His current research mainly focuses on CMOS RF IC and biomedical applications. His ongoing work includes RFID, PLL, low-power wireless transceivers, and smart clinic equipment with combination of leading edge CMOS RFIC and digital imaging processing techniques. He is co-authors of 11 books and book chapters, more than 118 paper in international Journals and over 350 papers in international Conferences. He is holding 75 Chinese patents and 4 US patent.
Prof. Wang has served as Deputy Chairman of Beijing Semiconductor Industries Association and ASIC Society of Chinese Institute of Communication, as well as Deputy Secretary General of Integrated Circuit Society in China Semiconductor Industries Association. He had been one of the chief scientists of the China Ministry of Science and Technology serves on the expert committee of the National High Technology Research and Development Program of China (863 Program) in the area of information science and technologies from 2007 to 2011. He had been an official member of China Committee for the Union Radio-Scientifque Internationale (URSI) during 2000 to 2010. He was the chairman of IEEE Solid-State Circuit Society Beijing Chapter during 1999-2009. He served as a technologies program committee member of the IEEE International Solid-State Circuit Conference (ISSCC) from 2005 to 2011. He has been a steering committee member of the IEEE Asian Solid-State Circuit Conference (A-SSCC) since 2005 and has served as the technical program chair for the 2013 A-SSCC. He served as a Guest Editor for IEEE JOURNAL OF SOLID-STATE CIRCUITS Special Issue in December 2006, December 2009 and November 2014. He was an associate editor of IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS — PART II: EXPRESS BRIEFS and he is currently an Associate Editor for IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
Dr Maysam Ghovanloo (Georgia Institute of Technology, USA)
Title: " Distributed Free-Floating Brain-Computer Interfaces "
Abstract — Brain structure is extremely complex and the mechanisms of memory, actions, and emotions as well as many brain disorders remain mysterious because they emerge from interactions among large populations of neurons in widespread networks across the brain. Therefore, to better understand the brain, neuroscientists need advanced electrode and interface electronics capable of recording the activity of individual neurons over many different areas of the brain. In fact, neural recording and modulation of the future are likely to require the ability to simultaneously interface with multiple neural sites distributed over a large area. The current neural interfaces clearly fall short of achieving this goal because of their limited area coverage. I will present a new distributed neural interface that reduces the device size by an order of magnitude in each dimension towards mm-sized devices for recording of multi-channel signals over a large brain area. The new distributed implants will be small enough to be gently pushed into the cortex in the form of small “push-pins” and “float” with the brain without any source of stress or strain around the electrodes, such as bundles of wires in large centralized structure in traditional architectures. We are developing these free-floating distributed neural interfaces not only for wireless neural recording but also electrical and optical neuromodulation, together with a scalable ecosystem to evaluate their feasibility at the preclinical level on freely behaving small animals.
Biography — Maysam Ghovanloo received his B.S. degree in electrical engineering from the University of Tehran, and M.S. degree in biomedical engineering from the Amirkabir University of Technology. He also received the M.S. and Ph.D. degrees in electrical engineering from the University of Michigan, Ann Arbor, in 2003 and 2004, respectively. He was an assistant professor in the Department of ECE at the North Carolina State University, Raleigh, NC from 2004 to 2007. Since 2007 he has been with the Georgia Tech School of Electrical and Computer Engineering, where he is a professor and the founding director of GT-Bionics Lab. Dr. Ghovanloo is an Associate Editor of the IEEE Transactions on Biomedical Circuits and Systems, and IEEE Transactions on Biomedical Engineering. He is also serving on the Analog Circuits subcommittee of the Custom Integrated Circuits Conference (CICC). He has received the National Science Foundation CAREER Award, the Tommy Nobis Barrier Breaker Award for Innovation, and Distinguished Young Scholar Award from the Association of Professors and Scholars of Iranian Heritage.