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Archive for the ‘Waves Chapter’ Category

IEEE Winnipeg Waves Chapter – An Exploration of Radiation Physics – May 10, 2016

Wednesday, May 4th, 2016

IEEE Winnipeg Waves Chapter is pleased to present:

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Seminar Title: AN EXPLORATION OF RADIATION PHYSICS

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Speaker: Dr. Edmund Miller

IEEE Distinguished Lecturer—Antennas and Propagation Society

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Date: Tuesday, May 10, 2016 at 2.30 PM

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Location:  EITC E2-350 (Fort Garry Campus; Engineering Building)

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Abstract of the Presentation: All external electromagnetic fields arise from the process of radiation.  There would be no radiated, propagated or scattered fields were it not for this phenomenon.  In spite of this self-evident truth, our understanding of how and why radiation occurs seems relatively superficial from a practical viewpoint.  It’s true that physical reasoning and mathematical analysis via the Lienard-Wiechert potentials show that radiation occurs due to charge acceleration.  It’s also true that it is possible to determine the near and far fields of rather complex objects subject to arbitrary excitation, making it possible to perform analysis and design of EM systems.  However, if the task is to determine the spatial distribution of radiation from the surface of a given object from such solutions, the answer becomes less obvious.

 

One way to think about this problem might be to ask, were our eyes sensitive to X-band frequencies and capable of resolving source distributions a few wavelengths in extent, what would be the image of such simple objects as dipoles, circular loops, conical spirals, log-periodic structures, continuous conducting surfaces, etc. when excited as antennas or scatterers? Various kinds of measurements, analyses and computations have been made over the years that bear on this question.  This lecture will summarize some relevant observations concerning radiation physics in both the time and frequency domains for a variety of observables, noting that there is no unanimity of opinion about some of these issues.  Included in the discussion will be various energy measures related to radiation, the implications of Poynting-vector fields along and near wire objects, and the inferences that can be made from far radiation fields. Associated with the latter, a technique developed by the author called FARS (Far-field Analysis of Radiation Sources) will be summarized and demonstrated in both the frequency and time domains for a variety of simple geometries. Also to be discussed is the so-called E-field kink model, an approach that illustrates graphically the physical behavior encapsulated in the Lienard-Wiechert potentials. Brief computer movies based on the kink model will be included for several different kinds of charge motion to demonstrate the radiation process.

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Biography of the Speaker: Since earning his PhD in Electrical Engineering at the University of Michigan, E. K. Miller has held a variety of government, academic and industrial positions.  These include 15 years at Lawrence Livermore National Laboratory where he spent 7 years as a Division Leader, and 4+ years at Los Alamos National Laboratory from which he retired as a Group Leader in 1993.  His academic experience includes holding a position as Regents-Distinguished Professor at Kansas University and as Stocker Visiting Professor at Ohio University.  Dr. Miller wrote the column “PCs for AP and Other EM Reflections” for the AP-S Magazine from 1984 to 2000.  He received (with others) a Certificate of Achievement from the IEEE Electromagnetic Compatibility Society for Contributions to Development of NEC (Numerical Electromagnetics Code) and was a recipient (with others) in 1989 of the best paper award given by the Education Society for “Computer Movies for Education.”

 

He served as Editor or Associate Editor of IEEE Potentials Magazine from 1985 to 2005 for which he wrote a regular column “On the Job,” and in connection with which he was a member of the IEEE Technical Activities Advisory Committee of the Education Activities Board and a member of the IEEE Student Activities Committee.  He was a member of the 1992 Technical Program Committee (TPC) for the MTT Symposium in Albuquerque, NM, and Guest Editor of the Special Symposium Issue of the IEEE MTT Society Transactions for that meeting.  In 1994 he served as a Guest Associate Editor of the Optical Society of America Journal special issue “On 3 Dimensional Electromagnetic Scattering.” He was involved in the beginning of the IEEE Magazine “Computing in Science and Engineering” (originally called Computational Science and Engineering) for which he has served as Area Editor or Editor-at-Large.  Dr. Miller has lectured at numerous short courses in various venues, such as Applied Computational Electromagnetics Society (ACES), AP-S, MTT-S and local IEEE chapter/section meetings, and at NATO Lecture Series and Advanced Study Institutes.

 

Dr. Miller edited the book “Time-Domain Measurements in Electromagnetics”, Van Nostrand Reinhold, New York, NY, 1986 and was co-editor of the IEEE Press book Computational Electromagnetics:  Frequency-Domain Moment Methods, 1991.  He was organizer and first President of the Applied Computational Electromagnetics Society (ACES) for which he also served two terms on the Board of Directors.  He served a term as Chairman of Commission A of US URSI and is or has been a member of Commissions B, C, and F, has been on the TPC for the URSI Electromagnetic Theory Symposia in 1992 and 2001, and was elected as a member of the US delegation to several URSI General Assemblies.  He is a Life Fellow of IEEE from which he received the IEEE Third Millennium Medal in 2000 and is a Fellow of ACES.  His research interests include scientific visualization, model-based parameter estimation, the physics of electromagnetic radiation, validation of computational software, and numerical modeling about which he has published more than 150 articles and book chapters.  He is listed in Who’s Who in the West, Who’s Who in Technology, American Men and Women of Science and Who’s Who in America.

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Seminar: An Exploration of Radiation Physics

Wednesday, May 4th, 2016

IEEE Winnipeg Waves Chapter is pleased to present:

=================================================================

Seminar Title: AN EXPLORATION OF RADIATION PHYSICS

=================================================================

Speaker: Dr. Edmund Miller

IEEE Distinguished Lecturer—Antennas and Propagation Society

=================================================================

Date: Tuesday, May 10, 2016 at 2.30 PM

=================================================================

Location:  EITC E2-350 (Fort Garry Campus; Engineering Building)

=================================================================

Abstract of the Presentation: All external electromagnetic fields arise from the process of radiation.  There would be no radiated, propagated or scattered fields were it not for this phenomenon.  In spite of this self-evident truth, our understanding of how and why radiation occurs seems relatively superficial from a practical viewpoint.  It’s true that physical reasoning and mathematical analysis via the Lienard-Wiechert potentials show that radiation occurs due to charge acceleration.  It’s also true that it is possible to determine the near and far fields of rather complex objects subject to arbitrary excitation, making it possible to perform analysis and design of EM systems.  However, if the task is to determine the spatial distribution of radiation from the surface of a given object from such solutions, the answer becomes less obvious.

 

One way to think about this problem might be to ask, were our eyes sensitive to X-band frequencies and capable of resolving source distributions a few wavelengths in extent, what would be the image of such simple objects as dipoles, circular loops, conical spirals, log-periodic structures, continuous conducting surfaces, etc. when excited as antennas or scatterers? Various kinds of measurements, analyses and computations have been made over the years that bear on this question.  This lecture will summarize some relevant observations concerning radiation physics in both the time and frequency domains for a variety of observables, noting that there is no unanimity of opinion about some of these issues.  Included in the discussion will be various energy measures related to radiation, the implications of Poynting-vector fields along and near wire objects, and the inferences that can be made from far radiation fields. Associated with the latter, a technique developed by the author called FARS (Far-field Analysis of Radiation Sources) will be summarized and demonstrated in both the frequency and time domains for a variety of simple geometries. Also to be discussed is the so-called E-field kink model, an approach that illustrates graphically the physical behavior encapsulated in the Lienard-Wiechert potentials. Brief computer movies based on the kink model will be included for several different kinds of charge motion to demonstrate the radiation process.

=================================================================

Biography of the Speaker: Since earning his PhD in Electrical Engineering at the University of Michigan, E. K. Miller has held a variety of government, academic and industrial positions.  These include 15 years at Lawrence Livermore National Laboratory where he spent 7 years as a Division Leader, and 4+ years at Los Alamos National Laboratory from which he retired as a Group Leader in 1993.  His academic experience includes holding a position as Regents-Distinguished Professor at Kansas University and as Stocker Visiting Professor at Ohio University.  Dr. Miller wrote the column “PCs for AP and Other EM Reflections” for the AP-S Magazine from 1984 to 2000.  He received (with others) a Certificate of Achievement from the IEEE Electromagnetic Compatibility Society for Contributions to Development of NEC (Numerical Electromagnetics Code) and was a recipient (with others) in 1989 of the best paper award given by the Education Society for “Computer Movies for Education.”

 

He served as Editor or Associate Editor of IEEE Potentials Magazine from 1985 to 2005 for which he wrote a regular column “On the Job,” and in connection with which he was a member of the IEEE Technical Activities Advisory Committee of the Education Activities Board and a member of the IEEE Student Activities Committee.  He was a member of the 1992 Technical Program Committee (TPC) for the MTT Symposium in Albuquerque, NM, and Guest Editor of the Special Symposium Issue of the IEEE MTT Society Transactions for that meeting.  In 1994 he served as a Guest Associate Editor of the Optical Society of America Journal special issue “On 3 Dimensional Electromagnetic Scattering.” He was involved in the beginning of the IEEE Magazine “Computing in Science and Engineering” (originally called Computational Science and Engineering) for which he has served as Area Editor or Editor-at-Large.  Dr. Miller has lectured at numerous short courses in various venues, such as Applied Computational Electromagnetics Society (ACES), AP-S, MTT-S and local IEEE chapter/section meetings, and at NATO Lecture Series and Advanced Study Institutes.

 

Dr. Miller edited the book “Time-Domain Measurements in Electromagnetics”, Van Nostrand Reinhold, New York, NY, 1986 and was co-editor of the IEEE Press book Computational Electromagnetics:  Frequency-Domain Moment Methods, 1991.  He was organizer and first President of the Applied Computational Electromagnetics Society (ACES) for which he also served two terms on the Board of Directors.  He served a term as Chairman of Commission A of US URSI and is or has been a member of Commissions B, C, and F, has been on the TPC for the URSI Electromagnetic Theory Symposia in 1992 and 2001, and was elected as a member of the US delegation to several URSI General Assemblies.  He is a Life Fellow of IEEE from which he received the IEEE Third Millennium Medal in 2000 and is a Fellow of ACES.  His research interests include scientific visualization, model-based parameter estimation, the physics of electromagnetic radiation, validation of computational software, and numerical modeling about which he has published more than 150 articles and book chapters.  He is listed in Who’s Who in the West, Who’s Who in Technology, American Men and Women of Science and Who’s Who in America.

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Seminar: Parallel-MLFMA Solutions with Prof. Levent Gürel

Friday, July 17th, 2015

IEEE Winnipeg Waves Chapter is pleased to present:

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

Speaker: Prof. Levent Gürel

CEO, ABAKUS Computing Technologies

Adjunct Professor, Dept. of ECE, University of Illinois at Urbana-Champaign

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Date: Friday, July 17, 2015, at 10:30 AM

Location:  EITC E1-270 (Fort Garry Campus; Engineering Building)

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Abstract of the Presentation:

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.

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Biography of the Speaker:

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 theScientific 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.

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Waves Chapter Seminar- Dielectric-based Microwave Components

Wednesday, April 29th, 2015

IEEE Winnipeg Waves Chapter is pleased to present:


 

Seminar Title: Dielectric-based Microwave Components: Opportunities and Challenges

Speaker: Dr. Atabak Rashidian

Research Associate

Electrical and Computer Engineering Department

University of Manitoba, Winnipeg, MB, Canada


 

Date: Friday, April 24, 2015, at 3.00 PM

Location:  EITC E2-399 (Fort Garry Campus; Engineering Building)


 

Abstract of the Presentation:

Artificially modified dielectrics are attractive candidates to introduce new classes of microwave devices. Miniaturized structures, higher efficiencies due to lack of conductor loss, and extraordinary properties provided by functional materials make dielectric microwave components very promising to enhance wireless systems for many applications. Designing miniaturized multifunctional dielectric RF and microwave devices, however, involves main challenging issues in materials processing, microfabrication procedures, and more importantly in electromagnetic designs. This requires a multidisciplinary research in the field of materials science, mechanical engineering, and electrical engineering. In order to be able to realize photodefinable dielectric antennas, for instance, a new photoresist composite with improved electrical properties in microwave frequencies is developed. Lithographic microfabrication techniques compatible with the new composite are proposed and three dimensional electromagnetic designs and analyses are performed. In another research, a new methodology is established that allows designing planar dielectric microwave components which can be electrically tunable with application of modified ferroelectric materials. Printing fabrication technology is employed and optimized to introduce these microwave structures. Planar microwave components are very desirable for mobile systems and so far are mostly realized by metallic structures. The unique nonconductive property makes dielectric circuits ideal for biological and medical applications as well, since they are chemically neutral and do not interact with biological tissues. This presentation is focused on photodefinable and planar dielectric microwave devices, while other great research opportunities in this area, such as transparent dielectric antennas integrated with solar cells to develop green wireless communications and sensors, are also discussed.


 

Biography of the Speaker:

Atabak Rashidian received the MSc degree from Tarbiat Modares University, Tehran, in 2004, and the PhD degree from the University of Saskatchewan, Saskatoon, Canada, in 2011. Since 2012, he is with the Department of Electrical and Computer Engineering, the University of Manitoba, as a Postdoctoral Fellow and later in 2014 as a Research Associate. During his Ph.D. program, he was granted a four-year scholarship ($84,000) from the Telecommunications Research Labs of Canada (TRLabs). He has been a Visitor Scientist at the Institute of Microstructure Technology at the FZK German National Laboratory, where he started and developed a research project in microfabrication of thick polymer-based antenna structures in 2009. Prior to start his Ph.D. program, he spent 7 years serving telecommunication industries in both engineering and research positions. He has 6 patents on dielectric antenna and microwave structures and has published over 50 papers in international journals and conferences. His research interests include dielectric structures for antennas and microwave components, microfabrication processes and techniques for radio-frequency (RF) applications, advanced microwave materials including microcomposites and nanocomposites, and microwave measurements.

Dr. Rashidian has received 3 best paper awards for his research on dielectric-based microwave components. In 2011, his paper on “Deep x-ray lithography processing for fabrication of thick polymer-based antennas” won the best paper award from Journal of Micromechanical and Microengineering for novelty, significance, and potential impact on future research. In 2012, his paper on “Photoresist-based polymer resonator antennas: lithography fabrication, strip-fed excitation, and multimode operations” won the best paper award from the IEEE Antennas and Propagation Magazine and received the IEEE Antennas and Propagation Edward E. Altshuler Prize Paper Award. And in 2014, his paper on “Artificially engineered microwave materials” won one of the best paper awards from IEEE International Symposium on Antenna Technology and Applied Electromagnetics in Victoria, Canada.

Dr. Rashidian is a Senior Member of the IEEE.


 

IEEE Winnipeg Waves Chapter Seminar – Using random linear networking coding in dynamic storage environments

Thursday, February 19th, 2015

IEEE Winnipeg Waves Chapter is pleased to present:

 

Using random linear network coding in dynamic storage environments


 

Speaker: Prof. Muriel Médard

IEEE Distinguished Lecturer—Vehicular Technology Society

Cecil H. Green Professor in the Electrical Engineering and Computer Science Department

Massachusetts Institute of Technology (MIT)

Cambridge, MA 02139, United States


Date: Thursday, February 26, 2015 at 11.15 AM

Location:  EITC E1-270 (Fort Garry Campus; Engineering Building) [mappress mapid=”5″]


Abstract: While structured coding has been extensively considered for data repair in static networks, such approaches seem ill-suited to current clouds, which exhibit dynamic topologies and demands. We first demonstrate, through benchmarking, that random network coding can provide speeds that outperform, in terms of encoding and decoding throughput, commercial systems using structured codes. We then present two case studies. We first consider a distributed storage system with full failure or with intermittent availability of nodes. We show that random coding far outstrips, in terms of availability, uncodedduplication. This advantage is increased when content is regenerated at nodes from partial content from other nodes, in which case random linear network coding also outperforms common structured maximum-distance separable codes. The second case study illustrates how coding can be used to manage hybrid managed content distribution networks with peer-to-peer edge clouds, such as are currently being proposed to augment edge caching, when bandwidth availability may be variable. (Joint work with Hassan Charaf,Flavio du Pin Calmon, Frank Fitzek, Janus Heide, Daniel Lucani, Morten Pedersen, Martin Sipos, AronSzabados, Tamas Toth, Peter Vingelmann, Weifei Zeng.)


Biography: Muriel Médard is the Cecil H. Green Professor in the Electrical Engineering and Computer Science Department at MIT . She has served as editor for many IEEE publications and she is currently Editor in Chief of the IEEE Journal on Selected Areas in Communications. She was President of the IEEE Information Theory Society in 2012. She has served as TPC co-chair of ISIT , WiOpt, CONEXT , andNetcod, and co-chair of ISIT and Netcod. She was awarded the 2009 Communication Society and Information Theory Society Joint Paper Award, the 2009 William R. Bennett Prize in the Field of Communications Networking, the 2002 IEEE Leon K. Kirchmayer Prize Paper Award and several conference paper awards. She was co-winner of the MIT 2004 Harold E. Edgerton Faculty Achievement Award. In 2007 she was named a Gilbreth Lecturer by the U.S. National Academy of Engineering. She received the 2013 MIT Graduate Student Council EECS Mentor Award. In 2014 she was named by Thomson Reuters one of the World’s Most Influential Scientific Minds.