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Archive for the ‘Electromagnetics & Radiation’ Category

An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers

Friday, August 25th, 2017

Wednesday September 27, 2017 at 4:00 p.m. Dr. Kate A. Remley, leader of the Metrology for Wireless Systems Group at NIST, will be presenting “An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers”.

Day & Time: Wednesday September 27, 2017
4:00 p.m. – 5:00 p.m.

Speaker: Dr. Kate A. Remley
Metrology for Wireless Systems Group at NIST

Location: University College
15 King’s College Circle
Toronto, Ontario
Room: 179

Contact: George V. Eleftheriades

Organizers: EM & Radiation Chapter, IEEE Toronto

Abstract: When the antenna is integrated into the body of a wireless device, as it is for cell phones and many other portable devices, performance testing is typically done under free-field conditions. In this overview presentation, we will discuss free-field characterization of some key wireless-device parameters by use of reverberation chambers. We will discuss recent research and some of the issues related to the use of these chambers for testing devices that transmit modulated signals.

Biography: Kate A. Remley (S’92-M’99-SM’06-F’13) was born in Ann Arbor, MI. She received the Ph.D. degree in Electrical and Computer Engineering from Oregon State University, Corvallis, in 1999. From 1983 to 1992, she was a Broadcast Engineer in Eugene, OR, serving as Chief Engineer of an AM/FM broadcast station from 1989-1991. In 1999, she joined the RF Technology Division of the National Institute of Standards and Technology (NIST), Boulder, CO, as an Electronics Engineer. She is currently the leader of the Metrology for Wireless Systems Group at NIST, where her research activities include development of calibrated measurements for microwave and millimeter-wave wireless systems, characterizing the link between nonlinear circuits and system performance, and developing standardized test methods for RF equipment used by the public-safety community.

Dr. Remley was the recipient of the Department of Commerce Bronze and Silver Medals, an ARFTG Best Paper Award, and is a member of the Oregon State University Academy of Distinguished Engineers. She was the Chair of the MTT-11 Technical Committee on Microwave Measurements from 2008 – 2010 and the Editor-in-Chief of IEEE Microwave Magazine from 2009 – 2011, and is the Chair of the MTT Fellow Nominating Committee.

Innovative Radio Systems and Antennas for Space Telecommunication Applications

Friday, February 3rd, 2017

Wednesday February 8, 2017 at 4:00 p.m. Dr. Hervé Legay, Thales Alenia Space, will be presenting “Innovative Radio Systems and Antennas for Space Telecommunication Applications”.

Speaker: Dr. Hervé Legay
Thales Alenia Space, France

Day & Time: Wednesday, February 8th, 2017
4:00 pm

Location: BA 1230, Bahen Centre for Information Technology
40 St. George Street, Toronto, ON M5S 2E4

Contact: Sean V. Hum

Organizer: IEEE Toronto Electromagnetics & Radiation Chapter

Abstract: We stand at the dawn of a new era for the space telecommunication ecosystem, marked by a consistent exponential growth in throughput as well as the irruption of new systems based on constellation of satellites. For these challenges, new models for disruptive innovation are imagined for the future generation of payloads:
• Developing new antennas and RF subsystems concepts inspired by optics, or based on metamaterials (composite media with an internal periodic structure that provides specific characteristics such as filtering, phase-shifting, absorbing, etc.)
• Integrating of smart and agile RF systems with signal processing capability that exploit mechanically actuated RF components, smart RF surfaces as well as innovative deployment schemes.
• Introducing into space cost efficient manufacturing techniques, based on additive and subtractive processes, metallised plastics, thin organic large area electronics, etc. Recent achievements in these innovative concepts developed at Thales Alenia Space will be presented, identifying their perspectives and their limitations.

Biography: Hervé Legay was born in 1965. He received the electrical engineering and Ph.D. degrees from the National Institute of Applied Sciences (INSA), Rennes, France, in 1988 and 1991, respectively. For two years, he was a Postdoctoral Fellow with the University of Manitoba, Winnipeg, MB, Canada, where he developed innovating planar antennas. He joined Alcatel Space, Toulouse, France, in 1994, which is now Thales Alenia Space. He initially conducted studies in the areas of telecommunication satellite antennas and antenna processing. He designed the architecture and the antijamming process of the Syracuse 3 active antenna. He is the author of 27 patents. He is currently responsible for the R&T studies on space antennas, director of the joint laboratory MERLIN involving Thales Alenia Space and IETR (Institut d’electronique et de Télécommunication de Rennes). He coordinates the collaborations with academic and research partners. He was appointed Antenna Expert in Thales. Dr. Legay is a co-prize-winner of the 2007 Schelkunoff prize paper award. He received the Gold Thales Awards in 2008, a reward for the best innovations in the group Thales.

Advanced Antenna Systems for 21st Century Satellite Communication Payloads

Sunday, July 10th, 2016

September 12, 2016 at 4:00 p.m. Dr. Sudhakar Rao, IEEE Fellow and Technical Fellow of Northrop Grumman, will be presenting “Advanced Antenna Systems for 21st Century Satellite Communication Payloads”.

Speaker: Dr. Sudhakar Rao
IEEE Fellow
Technical Fellow, Engineering & Global Products Division
Northrop Grumman Aerospace Systems

Day & Time: Monday, September 12, 2016
4:00 p.m. – 5:00 p.m.

Location: Room BA 1220
40 St. George Street, Toronto, M5S 2E4

Abstract: 21st century has so far seen several new satellite services such as local-channel broadcast for direct broadcast satellite service (DBS), high capacity K/Ka-band personal communication satellite (PCS) service, hosted payloads, mobile satellite services using very large deployable reflectors, high power hybrid satellites etc. All these satellite services are driven by the operators need to reduce the cost of satellite and pack more capability into the satellite. Antenna sub-system design, mechanical packaging on the spacecraft, and RF performance become very critical for these satellites. This talk will cover recent developments in the areas of antenna systems for FSS, BSS, PCS, & MSS satellite communications. System requirements that drive the antenna designs will be presented initially with brief introduction to satellite communications. Reflector and array antenna designs will be covered in this talk.

Advanced antenna system designs for contoured beams, multiple beams, and reconfigurable beams will be presented. Contoured beam antennas using dual-gridded reflectors, shaped single reflectors, and shaped Gregorian reflectors will discussed. Multiple beam antenna (MBA) concepts and their advantages compared to conventional contoured beams will be introduced.

Various designs of the MBA for DBS, PCS, and MSS services will be discussed along with practical examples. Recent advances in feed technology and reflector technology will be addressed and few examples. Advances in multi-band antennas covering multiple bands will be presented. Topics such as antenna designs for high capacity satellites, large deployable mesh reflector designs, low PIM designs, and power handling issues will be included. Advanced high power test methods for the satellite payloads will be addressed. Brief introductions to TT&C antennas, passive inter modulation products (PIM) and multipaction for satellite payloads will be given. Future trends in the satellite antennas will be discussed. At the end of this talk, engineers will be exposed to typical requirements, designs, hardware, software, and test methods for various satellite antennas.

Biography: Sudhakar K. Rao received B.Tech, M.Tech, and Ph.D degrees in electronics & communications engineering from REC Warangal, IIT Kharagpur, and IIT Madras in 1974, 1976, and 1979 respectively. During the period 1976-1977 he worked as a Technical officer at ECIL Hyderabad and then as a Senior Scientist at the Electronics and Radar development Establishment, Bangalore on phased array antennas for airborne applications during 1980-1981. He worked as a post-doctoral fellow at University of Trondheim, Norway and then as a research associate at University of Manitoba during 1981-1983. During1983-1996, he worked at Spar Aerospace Limited (now MDA), Montreal, Canada, as a Staff Scientist and developed advanced antennas for several satellite communications. From 1996-2003 he worked as Chief Scientist/Technical Fellow at Hughes/Boeing Satellite Systems and developed multiple beam antennas and reconfigurable beam payloads for commercial and military applications. During the period 2003-2010, he worked as a Corporate Senior Fellow at Lockheed Martin Space Systems and developed antenna payloads for fixed satellite, broadcast satellite, and personal communication satellite services. He invented novel high power TVAC test methods for satellite payloads using “pick-up horn absorber loads” that have about 8 times cost and schedule savings which has become a standard method at Lockheed Martin and used successfully on more than 10 satellite payloads. He is currently a Technical Fellow at Northrop Grumman Aerospace Systems, Redondo Beach, CA working on advanced antenna systems for space & aircraft applications.

Dr. Rao developed antenna payloads for more than 70 satellites including first mobile satellite M-Sat, first Direct Broadcast Satellite with local channels (DirecTV-4S), and first multiple beam antenna at Ka-band for personal communications satellites. His work on development of radiation templates for complex radiation patterns of satellite antennas for interference analysis was adopted and recommended by the International Telecommunication Union (ITU)/CCIR in 1992 as the world-wide standard for satellite manufacturers and operators. He authored over 170 technical papers and has 44 U.S patents. He authored and co-edited three text book volumes on “Handbook of Reflector Antennas and Feed Systems” that are published in June 2013 by the Artech House.

Dr. Rao became an IEEE Fellow in 2006 and a Fellow of IETE in 2009. He received several awards and recognitions that include 2002 Boeing’s Special Invention Award for series of patents on satellite antenna payloads, 2003 Boeings’ technical achievement award, Lockheed Martin’s Inventor of Technology award in 2005 & 2007, IEEE Benjamin Franklin Key Award in 2006, Delaware Valley Engineer of the Year in 2008, and Asian American Engineer of the year award in 2008. He received IEEE Judith Resnik Technical Field Award in 2009 for pioneering work in aerospace engineering. He is the recipient of the IETE’s 2015 Prof. S.N. Mitra Memorial award. He received best reviewer recognition by the IEEE Transactions on Antennas & Propagation Journal for the years 2014 and 2015. Dr. Rao is appointed as the Distinguished Lecturer by the IEEE APS for a three year period (2014-2016). He was the Chair for the IEEE APS “Industry Initiatives Committee” during 2010-2015, Associate Editor for the IEEE Antennas & Propagation Magazine’s “Antenna Applications Corner”, Associate Editor for the IEEE Transactions on Antennas & Propagation, Special Session Organizer/Chair for the last six IEEE APS/URSI Symposia, Technical Program Committee member for IEEE APS/URSI Symposia from last 10 years, and reviewer for the IEEE AP Transactions, WPL, IEE etc. Dr. Rao mentored more than 50 engineers in his career who are now in key technical and management positions throughout the aerospace industry.

Imaging Tissue and Treating Cancer with Microwaves

Friday, January 8th, 2016

Thursday January 28, 2016 at 3:00 p.m. Professor Susan Hagness, University of Wisconsin-Madison, will be presenting “Imaging Tissue and Treating Cancer with Microwaves”.

Speaker: Professor Susan Hagness
University of Wisconsin-Madison

Day & Time: Thursday, January 28, 2016
3:00 p.m.

Location: Sandford Fleming Building, 10 King’s College Rd
Room SF1105

Organizer: IEEE Toronto Electromagnetics and Radiation Chapter

Contact: Costas D. Sarris

Abstract: The endogenous (and possibly exogenously influenced) dielectric properties of tissue at microwave frequencies vary across different tissue types and physiological states. These properties may be exploited to differentiate tissues via low-power microwave imaging and to selectively heat diseased tissue at higher power levels. This presentation will highlight recent theoretical and experimental advances in low-cost microwave theranostics – that is, diagnostic and therapeutic microwave-based technologies – with an emphasis on breast imaging and targeted cancer treatment. On the diagnostic side, 3-D quantitative microwave imaging technology has the potential to address several important clinical needs in breast imaging, including evaluating breast density as part of a patient’s individualized risk assessment, screening women who are at higher risk for cancer, and monitoring changes in breast tissue in response to prevention and treatment protocols. On the therapeutic side, minimally invasive microwave ablation using miniaturized antennas as interstitial heating probes is emerging as a less invasive alternative to surgical resection and more effective and versatile alternative to conventional thermoablative techniques for the treatment of primary tumors.

Biography: Susan C. Hagness received the B.S. degree with highest honors and the Ph.D. degree in electrical engineering from Northwestern University in 1993 and 1998, respectively. Since 1998, she has been with the Department of Electrical and Computer Engineering at the University of Wisconsin-Madison, where she currently holds the title of Philip D. Reed Professor and serves as the Associate Dean for Research and Graduate Affairs in the College of Engineering. She is also a Faculty Affiliate of the Department of Biomedical Engineering and a member of the UW Carbone Comprehensive Cancer Center. Dr. Hagness was the recipient of the Presidential Early Career Award for Scientists and Engineers (PECASE) presented by the U.S. White House in 2000. In 2002, she was named one of the 100 top young innovators in science and engineering in the world by the MIT Technology Review magazine. She is also the recipient of the UW-Madison Emil Steiger Distinguished Teaching Award (2003), the IEEE Engineering in Medicine and Biology Society Early Career Achievement Award (2004), the URSI Isaac Koga Gold Medal (2005), the IEEE Transactions on Biomedical Engineering Outstanding Paper Award (2007), the IEEE Education Society Mac E. Van Valkenburg Early Career Teaching Award (2007), the UW System Alliant Energy Underkofler Excellence in Teaching Award (2009), the Physics in Medicine and Biology Citations Prize (2011), the UW-Madison Kellett Mid- Career Award (2011), and the UW-Madison College of Engineering Benjamin Smith Reynolds Award for Excellence in Teaching Engineers (2014). She was elected Fellow of the IEEE in 2009. She has held numerous leadership positions within the IEEE Antennas and Propagation Society (AP-S) and the United States National Committee (USNC) of the International Union of Radio Science (URSI). She was the Technical Program Chair of the 2012 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting in Chicago, IL, and most recently completed a term as Chair of the IEEE AP-S Fellows Evaluation Committee.

The Wonderful World of Nonlinearity: Modeling and Characterization of RF and Microwave Circuits

Wednesday, January 6th, 2016

Monday January 18, 2016 at 5:00 p.m. Jose C. Pedro, Professor at the University of Aveiro, will be presenting a Distinguished Microwave Lecture, on “The Wonderful World of Nonlinearity: Modeling and Characterization of RF and Microwave Circuits”.

Speaker: Jose C. Pedro
University of Aveiro

Day & Time: Monday, January 18, 2016
5:00 p.m. – 6:00 p.m.

Location: Room GB405, Galbraith Building
35 St. George Street, Toronto, M5S 1A4

Organizer: IEEE Toronto Electromagnetics and Radiation Chapter

Contact: George V. Eleftheriades

Abstract: Despite the many studies that have been undertaken to understand the wonderful world of nonlinearity, most undergraduate electrical engineering programs are still confined to linear analysis and design tools. As a result, the vast majority of microwave designers still cannot profit from the significant technological advancements that have been made in nonlinear circuit simulation, active device modeling and new instrumentation for performance verification. So, they tend to conduct their designs relying on experience, empirical concepts, and many trial and error iterations in the lab.
This talk will reveal the ubiquitous presence of nonlinearity in all RF and microwave circuits and the recent efforts made to understand, model, predict, and measure its diverse manifestations. We aim to bring microwave engineers’ attention to newly available techniques, and attract researchers to pursue further studies on this scientifically exciting topic.
Starting with some elementary properties of nonlinear circuits (like nonlinear signal distortion, harmonic generation, frequency conversion and spectral regrowth), we will show that nonlinearity is present in all wireless circuits, either to perform a desired signal operation or as unintentional distortion. In this way, we will show how oscillators, modulators or mixers could not exist without nonlinearity, while power-amplifier designers struggle to get rid of its distortion effects.
After this theoretical overview, we will introduce some recent advancements in nonlinear microwave circuit analysis tools and illustrate different types of models that are currently being used to represent and predict device, circuit, and system performance. Finally, we will focus the talk on the key metrics that are used to characterize nonlinear behavior, as well as newly developed lab instruments and their ability to assess device performance.

Biography: José C. Pedro received the diploma, doctoral and habilitation degrees in electronics and telecommunications engineering, from University of Aveiro, Portugal, in 1985, 1993 and 2002, respectively.
From 1985 to 1993 he was an Assistant Lecturer at University of Aveiro, and a Professor since 1993. Currently he is a Full Professor at the same University, and a Senior Research Scientist at the Institute of Telecommunications.
His main scientific interests include active device modeling and the analysis and design of various nonlinear microwave circuits, in particular, the design of highly linear multi-carrier power amplifiers and mixers. He is the leading author of Intermodulation Distortion in Microwave and Wireless Circuits (Artech House, 2003), has authored or co-authored more than 200 papers in international journals and symposia, and served the IEEE in the Portuguese MTT/AP/ED Joint Chapter, the MTT-11 Technical Committee and as a reviewer and Associate Editor for the MTT Transactions and reviewer for the MTT-IMS and the EuMC.
Prof. Pedro has served his university department as the Coordinator of the Scientific Council and as the Department Head.
Prof. Pedro received the Marconi Young Scientist Award in 1993 and the 2000 Institution of Electrical Engineers (IEE) Measurement Prize. In 2007 he was elected Fellow of the IEEE for his contributions to the nonlinear distortion analysis of microwave devices and circuits. Currently, he is an IEEE MTT-S Distinguished Microwave Lecturer.

Applications of Miniaturized-Element Frequency Selective Surfaces in Designing Microwave Lenses, Reflectarrays, and Polarization Converters

Tuesday, December 1st, 2015

Friday December 11, 2015 at 4:00 p.m. Prof. Nader Behdad of University of Wisconsin – Madison, will be presenting “Applications of Miniaturized-Element Frequency Selective Surfaces in Designing Microwave Lenses, Reflectarrays, and Polarization Converters”.

Speaker: Prof. Nader Behdad
University of Wisconsin – Madison

Day & Time: Friday, December 11, 2015
4:00 p.m.

Location: Room BA1210, Bahen Center for Information Technology
40 St. George Street, Toronto, ON, M5S 2E4

Organizer: IEEE Toronto Electromagnetics and Radiation Chapter

Contact: Sean Victor Hum

Abstract: Over the past several years, we have conducted research on a class of frequency selective surfaces with building blocks that consist of cascaded arrays of non-resonant, sub-wavelength periodic structures. Due to the small lateral dimensions and thicknesses of their unit cells, these structures are referred to as miniaturized-element frequency selective surfaces (MEFSSs). As spatial filters, MEFSSs can be designed to provide a wide range of response types with arbitrary levels of selectivity. MEFSSs capable of operating at extremely high incident power levels have also been developed and experimentally demonstrated for operation as spatial filters in HPM systems. Finally, MEFSSs having suppressed harmonics over extremely broad bandwidths have been developed for reduction of radar signatures of antennas and other objects.

In addition to acting as spatial filters, the building blocks of MEFSSs can be used to serve other purposes as well. For example, by using the unit cells of a band-pass or a low-pass MEFSS as a spatial phase shifter or a spatial time-delay unit (TDU), wideband, true-time-delay lenses and reflectarrays may be designed. By using anisotropic versions of these spatial TDUs, wideband linear-to-circular polarization converters or polarization selective surfaces can be designed. In this presentation, I will first briefly discuss the principles of operation of MEFSSs and present examples of spatial filters developed for different applications. Subsequently, I will discuss three specific applications where the unit cells of MEFSSs are used as transmissive or reflective time-delay units. These include the development of wideband true-time-delay microwave lenses and reflectarrays as well as broadband linear-to-circular polarization converters designed using anisotropic time delay units.

Biography: Nader Behdad received the B.S. degree in Electrical Engineering from Sharif University of Technology (Tehran, Iran) in 2000 and the M.S. and Ph.D. degrees in Electrical Engineering from University of Michigan (Ann Arbor, MI, U.S.A.) in 2003 and 2006 respectively. He was an Assistant Professor with the Department of Electrical Engineering and Computer Science, University of Central Florida, Orlando, FL, USA, from 2006 to 2008, and the Department of Electrical and Computer Engineering, University of Wisconsin–Madison, Madison, WI, USA, from 2009 to 2013, where he is currently an Associate Professor. His research expertise is in the area of applied electromagnetics with emphasis on electrically-small antennas, antenna arrays, antennas for biomedical applications, biomedical applications of RF/microwaves, periodic structures, frequency selective surfaces, passive high-power microwave devices, metamaterials, and biomimetics and biologically inspired systems in electromagnetics.

Prof. Behdad was a recipient of the IEEE R. W. P. King Prize Paper Award in 2014, the IEEE Piergiorgio L. E. Uslenghi Letters Prize Paper Award in 2012, the CAREER Award from the U.S. National Science Foundation in 2011, the Young Investigator Award from the United States Air Force Office of Scientific Research in 2011, and the Young Investigator Award from the United States Office of Naval Research in 2011. He received the Office of Naval Research Senior Faculty Fellowship in 2009, the Young Scientist Award from the International Union of Radio Science (URSI) in 2008, the Horace H. Rackham Predoctoral Fellowship from the University of Michigan in 2005-2006, the best paper awards in the Antenna Applications Symposium in Sep. 2003, and the second prize in the paper competition of the USNC/ URSI National Radio Science Meeting, Boulder, CO, in January 2004. His graduate students were the recipients of the ten different awards/recognitions at the IEEE Pulsed Power & Plasma Science in 2013, IEEE AP-S/URSI Symposium in 2010, 2012, 2013, and 2014, and the Antenna Applications Symposium in 2008, 2010, and 2011. He serves as an Associate Editor for IEEE Antennas and Wireless Propagation Letters and served as the co-chair of the technical program committee of the 2012 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting.

Novel Single-Source Integral Equation for Solution of Electromagnetic Scattering Problems on Penetrable Objects

Sunday, November 8th, 2015

Tuesday November 17, 2015 at 4:00 p.m. Vladimir Okhmatovski, Associate Professor in the Department of Electrical and Computer Engineering at the University of Manitoba, will be presenting “Novel Single-Source Integral Equation for Solution of Electromagnetic Scattering Problems on Penetrable Objects”.

Speaker: Vladimir Okhmatovski
Associate Professor
Department of Electrical and Computer Engineering at the University of Manitoba

Day & Time: Tuesday, November 17, 2015
4:00 p.m.

Location: Room BA1210
Bahen Center for Information Technology
40 St. George Street, Toronto
M5S2E4

Organizer: IEEE Toronto Electromagnetics & Radiation Chapter

Contact: Costas D. Sarris, Email:costas.sarris@utoronto.ca

Abstract: A new Surface–Volume–Surface Electric Field Integral Equation (SVS-EFIE) is discussed. The SVS-EFIE is derived from the volume integral equation by representing the electric field inside the scatterer as a superposition of the waves emanating from its cross section’s boundary. The SVS-EFIE has several advantages. While being rigorous in nature, it features half of the degrees of freedom compared to the traditional surface integral equation formulations such as PMCHWT and it requires only electric-field-type of Green’s function instead ofboth electric and magnetic field types. The latter property brings significant simplifications to solution of the scattering problems on the objects situated in multilayered media.

Both scalar and vector formulations of the SVS-EFIE equation has been developed for solution of 2D scattering problems on penetrable cylinders under TM and TE polarizations. The SVS-EFIE has been also been applied to the solution of the quasi-magneetostatic problems of current flow in complex interconnects in both homogeneous and multilayered media. Detailed description of the method of moment discretization and resultant matrices is discussed. Due to the presence of a product of surface-to-volume and volume-to-surface integral operators, the discretization of the novel SVS-EFIE requires both surface and volume meshes. In order to validate the presented technique, the numericalresults are compared with the reference solutions.

Biography: Vladimir Okhmatovski received Ph.D. degree in antennas and microwave circuits from the Moscow Power Engineering Institute, Moscow, Russia in 1997. He was a Post-Doctoral Research Associate with the National Technical University of Athens from 1998 to 1999 and with the University of Illinois at Urbana-Champaign from 1999 to 2003. From 2003 to 2004, he was with the Department of Custom Integrated Circuits at Cadence Design Systems in Tempe, Arizona. In 2004, he joined the Department of Electrical and Computer Engineering, University of Manitoba, where is currently an Associate Professor. His research interests are the fast algorithms of electromagnetics, high-performance computing, modeling of interconnects, and inverse problems.

Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures

Sunday, June 28th, 2015

July 15, 2015 at 4:00 p.m. Prof. Levent Gurel will be presenting “Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures”. [Distinguished Lecture]

Speaker: Prof. Levent Gürel
CEO, ABAKUS Computing Technologies Adjunct Professor, Dept. of ECE, University of Illinois at Urbana-Champaign

Day & Time: Wednesday, July 15, 2015
4:00 p.m. – 5:00 p.m.

Location: Room BA 1210
Bahen Centre
University of Toronto – St. George Campus
40 St. George Street

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Organizer: IEEE Electromagnetics & Radiation Joint Chapter

Abstract: It is possible to solve extremely large electromagnetics problems accurately and efficiently by using the multilevel fast multipole algorithm (MLFMA) and parallel MLFMA. This has important implications in terms of obtaining the solution of previously intractable physical, real-life, and scientific problems in various areas, such as (subsurface) scattering, optics, bioelectromagnetics, metamaterials, nanotechnology, remote sensing, etc. Accurate simulations of such real-life electromagnetics problems with integral equations require the solution of dense matrix equations involving millions of unknowns. Most recently, we have achieved the solutions of larger than 1,000,000,000×1,000,000,000 (one billion!) dense matrix equations! Solutions of these extremely large problems cannot be achieved easily, even when using the most powerful computers with state-of-the-art technology. Instead, we have been solving some of the world’s largest integral-equation problems in computational electromagnetics by employing fast algorithms implemented on parallel computers. For more information: www.abakus.computing.technology

In this talk, following a general introduction to our work in computational electromagnetics, I will present integral-equation and MLFMA formulations of dielectric/composite structures. Then, I will continue with rigorous modeling of three-dimensional optical metamaterial and plasmonic structures that are composed of multiple coexisting dielectric and/or conducting parts. Such composite structures may possess diverse values of conductivities and dielectric constants, including negative permittivity and permeability. It is possible to formulate and use different types of integral equations depending on which ones have better conditioning properties. I will briefly mention the development of effective Schur-complement preconditioners specifically for dielectric problems. Solutions of complicated real-life problems involving metamaterial structures, red blood cells, and dielectric photonic crystals will be presented. If time permits, various challenges encountered during the solutions may be touched upon.

Biography: Prof. Levent Gürel (Fellow of IEEE, ACES, and EMA) received the M.S. and Ph.D. degrees from the University of Illinois at Urbana-Champaign (UIUC) in 1988 and 1991, respectively, in electrical and computer engineering. He worked at the IBM Thomas J. Watson Research Center, Yorktown Heights, New York, in 1991-94. During his 20 years with Bilkent University, he served as the Founding Director of the Computational Electromagnetics Research Center (BiLCEM) and a professor of electrical engineering. He is also an Adjunct Professor at UIUC. Prof. Gürel is the Founder and CEO of ABAKUS Computing Technologies, a company that is geared towards advancing the use of cutting-edge computing technologies for solving difficult scientific problems with important real-life applications and societal benefits. He is conferred the UIUC ECE Distinguished Alumni Award in 2013 and the IEEE Harrington-Mittra Award in Computational Electromagnetics in 2015. He was named an IEEE Distinguished Lecturer for 2011-2014 and is still serving in emeritus capacity. He was invited to address the 2011 ACES Conference as a Plenary Speaker and a TEDx Conference in 2014. Among other recognitions of Prof. Gürel’s accomplishments, the two prestigious awards from the Turkish Academy of Sciences (TUBA) in 2002 and the Scientific and Technological Research Council of Turkey (TUBITAK) in 2003 are the most notable. Since 2003, Prof. Gürel has been serving as an associate editor for Radio Science, IEEE Antennas and Wireless Propagation Letters, IET Microwaves, Antennas & Propagation, JEMWA, PIER, ACES Journal, and ACES Express.