The IEEE AP-S Distinguished Lecturer Program provides AP-S chapters
in the U.S. and abroad with talks by experts on topics of interest
and importance to the AP community. The chapters incur little or
no cost in making use of this program. Each chapter can request
a maximum of two visits per year by our Distinguished Lecturers.
Requests must be approved prior to making an official commitment
by contacting the Chair of the Distinguished Lecturer
Program. The AP-S Society will reimburse current Distinguished
Lecturers up to $1,250 for presentations to AP-S Chapters located
inside the DL's home continent. Travelling outside the DL’s
continent is currently reimbursable at up to $2,500. The local expenses
are expected to be covered by the host chapter; so it is best for
the distinguished lecturers to give talks at typically three different
chapters in the same or different countries. While this will require
some coordination with the different chapters to be visited, the
Associate Editor of the Magazine’s Chapter News will notify
the Chapter Chairs and publicize forthcoming trips of the DLs in
the magazine. In addition, the trips will be shown on the website
of our society (http://www.ieeeaps.org). On average, a lecturer
might get to travel (nationally plus internationally) about 3 or
4 times a year. To receive reimbursement, the lecturers are required
to keep all expense receipts and send them to the Chair along with
an expense report on a standard IEEE reimbursement form, which can
be downloaded from the IEEE website.
All distinguished lecturers are outstanding in their fields of
specialty. Collectively, the Distinguished Lecturers possess a broad
range of expertise within the area of AP. Thus, the chapters are
strongly encouraged to use this program as a means to make their
local AP community aware of the most recent scientific and technological
trends.
Although the Chair selects and appoints the
Distinguished Lecturers, the Chair is open
to suggestions from members of the IEEE AP-S and the local AP Chapter
Chairs for the selection of appropriate topics and/or nominating
Lecturers in the future. The list of all Distinguished Lecturers
is available at the IEEE website relating to the Distinguished Lecturer
Program, in addition to the AP-S Magazine.
New Lecturers: We
welcome Dr. Roberto Graglia, Politecnico di Torino for 2009-2012
with his lectures in Computational Electromagnetics.
We thank Prof. George Eleftheriades for his invaluable contribution
to the program.
Dr. Nick Buris, Prof Christos G. Christodoulou, Prof. Koichi Ito,
Dr. Peter de Maagt, Prof. Yahya Rahmat-Samii, Prof. John Volakis,
Prof. Werner Wiesbeck, Dr.-Ing. Marta Martínez Vázquez
and Dr. Zhi Ning Chen will continue to serve in 2009-2010.
The Chair of the Distinguished Lecturer
Program is
J(Yiannis)
C Vardaxoglou
Head of Electronic and Electrical Engineering Department
Professor of Wireless Communications
Loughborough University
Loughborough
Leicestershire, LE113TU
United Kingdom J.C.Vardaxoglou@lboro.ac.uk
Dr.
Nicholas E. Buris
Motorola Labs
1301 E. Algonquin Rd.
Schaumburg, IL 60196 nick.buris@motorola.com
Nick Buris received the diploma of Electrical and Mechanical Engineering
in 1982 from the National Technical University of Athens, Greece
and the Ph.D. in Electrical Engineering from the North Carolina
State University, Raleigh, NC in 1986. In 1986 he was a visiting
professor at NCSU working on space reflector antennas for NASA.
In 1987 he joined the faculty of the department of Electrical and
Computer Engineering at the University of Massachusetts at Amherst.
His research work there spanned the areas of microwave magnetics,
phased arrays printed on ferrite substrates and broadband antennas.
In the summer of 1990 he was a faculty fellow at the NASA Langley
Research Center working on calibration techniques for dielectric
measurements and an ionization (plasma) sensor for an experimental
reentry spacecraft. In 1992 he joined the Applied Technology organization
of Motorola’s Paging Product Group and in 1995 he moved to
Corporate Research to start an advanced modeling effort. While at
Motorola he has worked on several projects from product design to
measurement systems and the development of proprietary software
tools for electromagnetic design. He currently manages the Microwave
Technologies Research Lab within Motorola Labs in Schaumburg, IL.
Recent activities of the group include high frequency communications
systems design, modeling and measurements of complex electromagnetic
problems, RFID systems as well as TIA standards work on propagation
and RF exposure. Nick is a senior member of the IEEE, and serves
on a MTT Technical Program Committee. He is also member of iNEMI
and recently served as chair of a TIA committee on RF exposure.
Electromagnetic Design for Wireless Applications and Multidisciplinary
Optimization
This presentation starts with several specific electromagnetic design
examples for wireless applications. These examples include antennas
for cellular handsets, RFIDs as well as electromagnetic interference
solution concepts. Various characteristics of advanced design methods
are then examined. The case is made that multidisciplinary design
methods need to be developed and employed for efficient solution
of complex problems. At present, multidisciplinary issues encountered
at the design of feature rich products are solved by intense communications
between the design groups of interacting disciplines. The design
of today’s challenging products demands the same and higher
degree of communications between the tools used by interacting disciplines.
An electromagnetic and structural design example is used to elucidate
the concepts discussed. Additionally, an outline of a framework
capable of addressing concurrent optimization of multiple disciplines
and of complex products is presented. The seminar ends with a list
of proposed problems that need to be solved so that maximum efficiency
can be achieved in solving the complex problems of the future.
Zhi Ning Chen received his BEng (1985), MEng (1988), PhD (1993)
and DoE (2003) degrees all in Electrical Engineering from Institute
of Communications Engineering, China and University of Tsukuba,
Japan, respectively. During 1988-1995, he taught at Institute of
Communications Engineering as Teaching Assistant, Lecturer and Associate
Professor as well as Southeast University, China as Postdoctoral
Fellow and later Associate Professor. During 1995-1997, he joined
in City University of Hong Kong, China as Research Assistant, later
Research Fellow. In 1997, he was awarded JSPS Fellowship to conduct
his research at University of Tsukuba, Japan. In 2001 and 2004,
he visited University of Tsukuba under JSPS Fellowship Program (senior
level). In 2004, he worked at IBM T. J. Watson Research Center,
USA as Academic Visitor. Since 1999, he has worked with Institute
for Infocomm Research (formerly known as Center for Wireless Communications
and Institute for Communication Research) as Member of Technical
Staff and later Principal Member of Technical Staff. His current
appointments are Principal Scientist and Department Head for RF
& Optical. He is concurrently holding Adjunct Professor Appointments
at Southeast University, Nanjing University, National University
of Singapore and Nanyang Technological University, Singapore.
Dr Chen has organized many international technical events as general
chairs, technical program committee chairs and key members of organizing
committees. He is the key founder of International Workshop on Antenna
Technology (iWAT).
Dr Chen has published more than 210 journal and conference papers.
He has authored and edited books entitled “Broadband Planar
Antennas”, “UWB Wireless Communication” and “Antennas
for Portable Devices” all published by John Wiley & Sons.
He also contributed to the books of “UWB Antennas and Propagation
for Communications, Radar, and Imaging” published by John
Wiley & Sons as well as “Antenna Engineering Handbook”
published by McGraw Hill. He is holding more than 20 granted and
filed patents. He has licensed his antenna designs to industry with
deals. His current research interest includes applied electromagnetics,
antennas for UWB, MIMO, WLAN, WiMAX (WiBro), WBAN, and bio-imaging
systems.
Dr Chen is a Fellow of the IEEE for his contribution to small and
broadband antennas for wireless applications. (www1.i2r.a-star.edu.sg/~chenzn)
Miniaturization of Ultra-wideband Antennas
Ultra-wideband (UWB) has become the promising wireless technology
in commercial applications such as the next generation of short-range
high data rate wireless communications, high resolution imaging,
and high accuracy radar. The antenna design becomes one of key factors
in UWB wireless systems due to the extremely wide operating bandwidth.
This presentation starts with the brief introduction of design challenges
of UWB antennas. An outlined of special design considerations are
presented from a systems point of view, followed by some state-of-the-art
solutions which are shown with technical details from an engineering
insight. Then, the miniaturization technology of UWB antennas is
addressed. The planar designs are highlighted due to their unique
merits and wide adoption in practical applications. Firstly, the
ground plane dependence of the antenna performance, one of the most
challenging issues in small antenna design is addressed. By using
a newly developed technique, the dependence of small antenna performance
on system ground plane has been alleviated. A design example is
used to elaborate the mechanism of the method. Based on this concept,
the antenna with further reduced size is designed to fit the size
of wireless USB dongle for high data-rate applications. Furthermore,
an innovative compact diversity UWB antenna is studied to show the
advantage of ground-independence of small antenna in diversity applications.
Lastly, a UWB antenna integrated with bandpass filter is proposed
to reduce the overall size of devices by using the concept of co-design.
In the end of the talk, the trend of UWB antenna R&D is offered
according to application and market demands.
Design Considerations of Antennas for MIMO Systems
-Antenna Engineering Perspectives
This talk will present and discusses the key design considerations
of antennas in multiple-input-multiple-output (MIMO) wireless communication
systems from antenna engineering perspectives. First, the effect
of antenna design on diversity performance of MIMO systems will
be analyzed. It will show that the configurations of the antennas
can greatly affect system performance, in particular, signal correlation
at both transmitters and receivers in both uplink and downlink.
Second, the effect on the envelope correlation and capacity of MIMO
systems will be evaluated by using antenna parameters, namely S-parameters
and radiation patterns. Third, the concepts of near-field and far-field
envelope correlation coefficients are introduced and discussed based
on the relationship between antenna parameters (S-parameters and
radiation patterns) and channel parameters (envelope correlation
coefficients) for spatial, polarization, and pattern diversity.
In particular, the antenna efficiency affected by inter-element
mutual coupling is taken into account in antenna design. Furthermore,
2-D and 3-D patterns of the envelope correlation coefficient are
presented to optimize the performance of MIMO systems. Conventionally,
the average envelope correlation coefficient has been used to evaluate
the diversity performance of antennas configurations, which doesn’t
provide antenna engineers with information about the distribution
of correlation in space. Fourth, the concept of overall correlation
of the system is presented to evaluate the diversity performance
of MIMO systems, which will, for example include spatial, polarization,
and pattern diversity. Then, the design considerations of antennas
for MIMO systems are presented from an antenna engineering perspective.
After that, a compact three-element MIMO antenna system designed
for indoor 2.4 GHz WLAN applications is exemplified to validate
the design considerations proposed here. Finally, the technology
to reduce inter-element mutual coupling is also introduced and applied
to the three-element design.
Christos
G. Christodoulou
ECE Department, Room 330
MSC01 1100
1 University of New Mexico
Albuquerque, NM 87131-0001 christos@ece.unm.edu
Christos G. Christodoulou received his Ph.D. degree in Electrical
Engineering from North Carolina State University in 1985. He served
as a faculty member in the University of Central Florida, Orlando,
from 1985 to 1998. In 1999, he joined the faculty of the Electrical
and Computer Engineering Department of the University of New Mexico,
where he served as the Chair of the Department from 1999 to 2005.
He is a Fellow member of IEEE and he served as the general Chair
of the IEEE Antennas and Propagation Society/URSI 1999 Symposium
in Orland, Florida, as the co-chair of the IEEE 2000 Symposium on
Antennas and Propagation for wireless communications, Waltham, MA,
and the co-technical chair for the IEEE Antennas and Propagation
society/URSI 2006 Symposium in Albuquerque. Currently, he is an
associate editor for the IEEE Transactions on Antennas Propagation,
the International Journal of RF and Microwave Computer-Aided Engineering,
and IEEE Antennas and Propagation Magazine. He served as a guest
editor for a special issue on "Applications of Neural Networks
in Electromagnetics" in the Applied Computational Electromagnetics
Society (ACES) journal and he is also co-editor of the IEEE Antennas
and Propagation special issue on "Synthesis and Optimization
Techniques in Electromagnetics and Antenna System Design".
He has published over 250 papers in journals, conferences, and book
chapters. He has also co-authored 4 books. His research interests
are in the areas of modeling of electromagnetic systems, reconfigurable
systems, machine learning applications in electromagnetics, and
smart antennas.
Reconfigurable Multifunctional Antennas
The requirements for increased functionality, such as direction
finding, radar, control and command, within a confined volume, place
a greater burden in today’s transmitting and receiving systems.
A solution to this problem is the re-configurable antenna. Antennas
that can be used for multiple purposes that function over several
frequency bands and that can be integrated on a package for mass-production
are the ultimate goals of commercial and defense investigators.
Furthermore, applications of such systems in personal and satellite
communications impose the requirement for elements miniaturized
in size and weight.
Key-elements to obtain reconfigurability in many RF circuits are
the Radio-Frequency MicroElectroMechanical Systems (RF-MEMS). Even
though RF-MEMS have been used in the past to reconfigure filters,
phase-shifters, capacitors and inductors, their integration in an
antenna system has been limited as it faces a plethora of issues
that need to be resolved. The absence of reconfigurable RF-MEMS
antenna system and the recent advances in fractal - and especially
Sierpinski gasket- antennas combined with the availability of series
cantilever RF-MEMS switches, sparked the pioneering idea to design
a multiple-frequency antenna that will radiate on-demand the same
radiation pattern at various frequencies. Such a system was designed
and successfully implemented, as the first functional, fully integrated
RF-MEMS reconfigurable self-similar antenna.
In this talk, several reconfigurable antennas are presented and
discussed. The antennas to be presented cover a wide range of designs
such as fractal antennas, triangular antennas, dipoles and monopoles
with variable sleeves. All these antennas make use of MEMS switches,
to make them reconfigurable. Some of the challenges that the designer
has to face in biasing and integrating these switches with the antenna
has are also presented and discussed.
Using Support Vector Machines in Electromagnetics
Since the 1990s there has been a significant activity in the theoretical
development and applications of Support Vector Machines (SVMs).
The theory of SVMs is based on the cross-pollination of optimization
theory, statistical learning, kernel theory and algorithmics. So
far, machine learning has largely been devoted to solving problems
relating to data mining, text categorization, and pattern/facial
recognition but not so much in the field of electromagnetics. Recently,
however, popular binary machine learning algorithms, including support
vector machines (SVM), have successfully been applied to wireless
communication problems, notably spread spectrum receiver design
and channel equalization. The high-speed capabilities and "learning"
abilities of support vectors can also be applied to solving complex
optimization problems in electromagnetics in the areas of radar,
remote sensing, microwaves, and antennas.
The aim of this talk is to introduce the subject of support vector
machines in its linear and non linear form, both as regressors and
as classifiers and to show how it can be applied to several problems
in electromagnetics. The intricacies and difficulties associated
with applying SVMs to complex problems will be discussed and it
will be shown how to generate training and testing data that can
be used with SVMs. Several examples that cover applications such
as automatic target recognition in radar, remote sensing, beamforming,
angle of arrival estimation, and microwaves will be presented and
discussed.
Koichi
Ito
Department of Medical System Engineering
Graduate School of Engineering
Chiba University
1-33 Yayoi-cho, Inage-ku, Chiba-shi, 263-8522
Japan ito.koichi@faculty.chiba-u.jp
or k-ito@ieee.org
Koichi Ito received the B.S. and M.S. degrees from Chiba University,
Chiba, Japan, in 1974 and 1976, respectively, and the D.E. degree
from the Tokyo Institute of Technology, Tokyo, Japan, in 1985, all
in electrical engineering.
From 1976 to 1979, he was a Research Associate at the Tokyo Institute
of Technology. From 1979 to 1989, he was a Research Associate at
Chiba University. From 1989 to 1997, he was an Associate Professor
at the Department of Electrical and Electronics Engineering, Chiba
University, and is currently a Professor at the Graduate School
of Engineering, Chiba University. He has been appointed as one of
the Deputy Vice-Presidents for Research, Chiba University, since
April 2005. In 1989, 1994, and 1998, he visited the University of
Rennes I, France, as an Invited Professor. Since 2004 he has been
appointed as an Adjunct Professor to Institute of Technology Bandung
(ITB), Indonesia. His main research interests include analysis and
design of printed antennas and small antennas for mobile communications,
research on evaluation of the interaction between electromagnetic
fields and the human body by use of numerical and experimental phantoms,
and microwave antennas for medical applications such as cancer treatment.
He has co-authored over 100 journal papers with review and nine
books including Handbook of Microstrip Antennas (IEE, 1989) and
Antennas and Propagation for Body-Centric Wireless Communications
(Artech House, 2006).
Dr. Ito is a Fellow of the IEEE, a member of the American Association
for the Advancement of Science, the Institute of Electronics, Information
and Communication Engineers (IEICE) of Japan, the Institute of Image
Information and Television Engineers of Japan (ITE) and the Japanese
Society for Thermal Medicine (formerly, Japanese Society of Hyperthermic
Oncology). He served as Chair of the Technical Group on Radio and
Optical Transmissions, ITE from 1997 to 2001 and Chair of the Technical
Group on Human Phantoms for Electromagnetics, IEICE from 1998 to
2006. He also served as Chair of the IEEE AP-S Japan Chapter from
2001 to 2002 and TPC Co-Chair of the 2006 IEEE International Workshop
on Antenna Technology (iWAT2006). He currently serves as General
Chair of iWAT2008 to be held in Chiba, Japan in March 2008, Vice-Chair
of the 2007 International Symposium on Antennas and Propagation
(ISAP2007) to be held in Japan, Vice-Chair of ISAP2008 to be held
in Taiwan, and as an Associate Editor for the IEEE Transactions
on Antennas and Propagation. He also serves as a Distinguished Lecturer
and an AdCom member for the IEEE Antennas and Propagation Society
since January 2007.
Microwave Antennas for Medical Applications
In recent years, various types of medical applications of antennas
have widely been investigated and reported. Typical recent applications
are:
1 . Information transmission:
RFID (Radio Frequency Identification) / Wearable or implantable
monitor
Wireless capsule endoscopy
In this presentation, three different types of antennas which have
been studied in our laboratory are introduced. Firstly, a pretty
small antenna for an implantable monitoring system is presented.
An H-shaped cavity slot antenna is a candidate for such a system.
Some numerical and experimental characteristics of the antenna are
demonstrated. Secondly, some different antennas or “RF coils”
for MRI systems are introduced. In addition, SAR (specific absorption
rate) distributions in the abdomen of a pregnant woman generated
in a bird cage coil are illustrated. Finally, after a brief overview
of thermal therapy and microwave heating, coaxial-slot antennas
and array applicators composed of several coaxial-slot antennas
for minimally invasive microwave thermal therapies are introduced.
Then a few results of actual clinical trials by use of the coaxial-slot
antennas are demonstrated from a technical point of view. Other
therapeutic applications of the coaxial-slot antennas such as hyperthermic
treatment for brain tumor and intracavitary hyperthermia for bile
duct carcinoma are introduced.
Phantoms for Evaluation of Interactions between Antennas and the
Human Body
Recently, much research has been done on the interactions between
the human body and electromagnetic (EM) waves radiated from antennas
for mobile terminals or other equipments. The "interactions"
mean two ways: an influence of the human body on the performance
of the antenna and an influence of EM waves on the human body. Such
interactions are estimated by numerical simulation and/or experimental
evaluation.
In this presentation, firstly, various types of numerical phantoms
or models which are used for theoretical analysis and computational
simulation are introduced. Canonical phantoms such as sphere or
cube have been mainly used for EM dosimetry inside the human head.
In order to estimate the performance of the antenna close to the
human body in the actual situation or SAR (Specific Absorption Rate)
distribution inside the human body, it is sometimes necessary to
use realistic numerical phantoms which are composed of many small
voxels. On the contrary, tissue-equivalent liquid, jelly, or solid
phantoms are usually used for experimental evaluation. Then some
different experimental phantoms are introduced and compared. There
are two typical ways to evaluate SAR distributions by using experimental
phantoms: the “electric-field method” with a liquid
phantom and the “thermographic method” with a solid
phantom. Finally, this presentation introduces some examples of
"new" solid phantoms including a UWB phantom and a torso
phantom which are used for the study on body-centric wireless communications.
Peter
de Maagt
Antenna and Submillimetre Wave Section
Electromagnetics & Space Environments Division
European Space Agency
PO Box 299
NL 2200 AG Noordwijk
The Netherlands
Peter de Maagt was born in Pauluspolder, The Netherlands, in 1964.
He received the M.Sc. and Ph.D. degrees from Eindhoven University
of Technology, Eindhoven, The Netherlands, in 1988 and 1992, respectively,
both in electrical engineering. In the period 1992/1993 he was station
manager and scientist for an INTELSAT propagation project in Surabaya,
Indonesia. He is currently with the European Space Research and
Technology Centre (ESTEC), European Space Agency, Noordwijk, The
Netherlands. His research interests are in the area of millimeter
and submillimeter-wave reflector and planar integrated antennas,
quasioptics, electromagnetic bandgap antennas, and millimeter- and
submillimeter-wave components. Dr. de Maagt was co-recipient of
the H.A. Wheeler Award of the IEEE Antennas and Propagation Society
for the best applications paper of 2001. He was granted a European
Space Agency Award for innovation in 2002. He was co-recipient of
the LAPC 2006 best paper award. Dr. de Maagt serves as an Associate
Editor for the IEEE Transaction on Antennas and Propagation.
Terahertz Technology for Space and Earth Applications
The terahertz (THz) part of the electromagnetic spectrum falls between
the lower frequency millimeter wave region and at higher frequencies,
the far-infrared region. The frequency range extends from 0.1 THz
to 10 THz, where both these limits are rather loose. As the THz
region separates the more established domains of microwaves and
optics, a typical THz technique will incorporate aspects of both
realms, and may even draw on the best of both. The two bounding
parts of the spectrum also yield distinct sets of methods of generating
and detecting THz waves. These approaches can thus be categorized
as having either microwave or optical/photonic origins. As a result
of breakthroughs in technology, the THz region is finally finding
applications outside its traditional heartlands of remote sensing
and radio astronomy. Extensive research has identified many attractive
uses and has paved the technological path towards flexible and accessible
THz systems. Examples of novel applications include medical and
dental imaging, gene theory, communications and detecting the DNA
sequence of virus and bacteria. The presentation will discuss the
range of THz applications and will present the components and systems
that are utilized for the frequency region.
Electromagnetic Bandgap Materials
Electromagnetic Bandgap Materials are artificially engineered materials
exhibiting novel properties. Since their discovery and first demonstration
in the late 1980's, interest in EBGs has grown explosively. The
potential take-up of these structures in Communications and Sensing
Systems is primarily due to the control of the frequencies and wavenumbers
of propagating and non-propagating electromagnetic waves to an extent
that was not previously possible. Much effort is now being concentrated
on the design and manufacture of these different classes of EBG-based
components. This presentation will highlight application areas of
EBG technology at microwave and (sub) millimeter wave. It sets out
with a brief introduction of the concepts. It then discusses some
generic configurations and resulting practical applications. Examples
of FSS, EBG and AMC generic technology in the microwave region include:
patch antennas, cavity antennas, parabolic antennas, metallo-dielectric
antennas, waveguides, filters and tunable structures. Examples of
applications are array antennas, high precision GPS, mobile telephony,
wearable antennas and diplexing antennas. In the submillimeter wave
region a 500 GHz dipole configuration is shown and some components.
Marta
Martínez-Vázquez
Dr. Marta Martínez Vázquez
Department of Antennas & EM Modelling
IMST GmbH
Carl-Friedrich-Gauss-Str. 2-4
47475 Kamp-Lintfort
Germany martinez@imst.de
Marta Martínez-Vázquez was born in Santiago de Compostela,
Spain, in 1973. She obtained the Dipl.-Ing. in telecommunications
and Ph.D. degree from Universidad Politécnica de Valencia,
Spain, in 1997 and 2003, respectively. In 1999 she obtained a fellowship
from the Pedro Barrié de la Maza Foundation for postgraduate
research at IMST GmbH, in Germany. Since 2000, she is a full-time
staff member of the Antennas and EM Modelling department of IMST.
Her research interests include the design and applications of antennas
for mobile communications, planar arrays and radar sensors, as well
as Electromagnetic Bandgap (EBG) materials. Dr. Martínez-Vázquez
was awarded the 2004 "Premio Extraordinario de Tesis Doctoral"
(Best Ph.D. award) of the Universidad Politécnica de Valencia
for her dissertation on small multiband antennas for handheld terminals.
She has been a member of the Executive Board of the ACE (Antennas
Centre of Excellence) Network of Excellence (2004-2007) and the
leader of its activity on small antennas. She is the vice-chair
of the COST IC0306 Action “Antenna Sensors and Systems for
Information Society Technologies”, and a member of the IEEE
Antennas and Propagation Society and of the Technical Advisory Panel
for the Antennas and Propagation Professional Network of IET. She
is the author of over 50 papers in journals and conference proceedings.
Dr. Martínez-Vázquez’s career is an example
of the positive results of such coordination programs. She started
as an expert participant in COST 260, became a Working Group leader
in COST 284, and a member of the Executive Board of ACA, leading
the “Small Antennas” activity. Presently, she is the
Vice-chair of the COST IC0603 Action.
An overview of European cooperation on antenna research
Antenna research has a long tradition in Europe, although the efforts
have been often scattered and uncoordinated, with a large gap between
university research and industrial applications. A first step towards
collaborative research was made with the creation of the COST activities,
also referred to as an Action (“CO-operation in the field
of Scientific and Technological research”), sponsored by the
European Commission. Under the COST umbrella, different Actions
were approved since the early 1970s that deal with antenna R&D.
From the first COST Action 25/1 ("Aerial Networks with Phase
Control", 1973-1979) to the recently started COST IC 0603 Action
(“Antenna Systems & Sensors for Information Society Technologies”,
2007-2011), the number of signatory countries has increased from
5 to over 20. These COST Actions have allowed the exchange of know-how
in a non-competitive manner, and are still an excellent forum for
open discussion regarding blue sky research. They have also fostered
collaborations between European organizations and the mobility of
researchers, especially young PhD students, through short term missions,
for example. Being essentially an open forum at a pre-competitive
level, COST is the ideal complement for other joint European research
programs, and many innovative concepts and novel antenna designs
have their roots in COST meetings.
Within the 6th Framework Program of the European Commission, a
new structuring instrument was used to complement and enhance the
collaboration initiated within COST, and thus further coordinate
antenna research to deal with the new challenges of the 21st century:
The Antenna Centre of Excellence (ACE) was established as a Network
of Excellence, including over 50 European institutions, both industrial
and academic from 17 European countries, with over 300 researchers
and 130 PhD students, and over 100 external participants from around
the world as members of the “ACE Community”. Over 4
years, ACE has tried to structure the fragmented European antenna
R&D world, reduce duplications and boost excellence and competitiveness
in key areas. Some of the results of ACE are:
The creation of the European School of Antennas, a new system
of geographically distributed PhD school which aims to improve
the antenna advanced training and research in Europe
Cooperation in antenna measurement, with an on-line database
of measurement facilities and collaboration agreements
Benchmarking of measurement facilities and software tools
The development of the EDI (Electromagnetic Data Interface)
for the exchange of compatible data between different software
tools
The creation of EuCAP (European Conference on Antennas and
Propagation), EurAAP (European Association on Antennas And Propagation)
and many new research groupings in critical areas
The Virtual Centre of Excellence, a multimedia platform designed
to provide a set of added value services to this Community by
establishing a single point (website based) to share information
across the entire research-manufacturing-users chain.
Terminal antenna design: practical considerations
Nowadays, the access to mobile communications not only through
mobile telephones, but also other kind of portable devices such
as notebooks or PDAs, equipped with PCMCIA cards, allows providing
almost universal connectivity, with access to public or private
networks. Therefore, both cellular standards, such as the GSM family
and third generation standards such as UMTS, as well as unlicensed
networks, like WLAN, should be accessible with a single device.
However, the limited space foreseen for the antenna and the small
overall size of the terminal are often the reason of the narrow
band characteristics of the resulting antennas. This problem becomes
even more serious when a multiband or an ultra-wideband antenna
has to be designed. Also, only a careful design of the antenna taking
into account the interaction both with the handset components and
the human user can lead to satisfying solutions that fulfill the
given requirements for mobile communications handsets. Their design
is, however, no trivial task due not only to the extensive requirements
of modern antennas but also to plethora of physical factors that
impinge on their performance, such as the close proximity of electronic
components.
However, in the design of antennas for commercial applications,
the designer has to take into account many issues not directly related
to the antenna itself. Antenna engineers have to interact with other
departments, to satisfy all the requirements in terms of, for example,
mechanical stability, aesthetical design or compliance testing.
Thus, the design must be able to adapt the antenna concept to eventual
changes in the device or the specifications. Although the use of
powerful software packages has allowed one to precisely simulate
the antennas in such a complex environment, they are useless without
an in-depth knowledge of electromagnetic theory and experience in
solving such problems.
Dr. Martínez-Vázquez has been involved in the design
of antennas for mobile communications both from the academic and
the industrial point of view, which allows her to have a global
view on the problems related to this topic.
Prof.
Yahya Rahmat-Samii
Electrical Engineering Department
University of California, Los Angeles
Los Angeles, CA 90095, USA rahmat@ee.ucla.edu
Yahya Rahmat-Sami is a Distinguished Professor of Electrical Engineering
at the University of California, Los Angeles (UCLA). Before joining
UCLA, he was a Senior Research Scientist at NASA's Jet Propulsion
Laboratory/California Institute of Technology. Dr. Rahmat-Samii
was the 1995 President of IEEE Antennas and Propagation Society
and has been appointed an IEEE Distinguished Lecturer presenting
lectures internationally. Dr. Rahmat-Samii was elected as a Fellow
of IEEE in 1985 and a Fellow of IAE in 1986 and also served as the
Vice President of AMTA. Dr. Rahmat-Samii was the 1984 recipient
of the prestigious Henry Booker Award of USNC/URSI. Dr. Rahmat-Samii
has authored and co-authored over 650 technical journal articles
and conference papers and has written 16 book chapters and two books
entitled, Electromagnetic Optimization by Genetic Algorithms, and
Impedance Boundary Conditions in Electromagnetics. He is also the
holder of several patents. His research contributions cover a diverse
area of electromagnetics, antennas, satellite and personal communications,
EBG structures, modern measurement and diagnostic techniques, numerical
and evolutionary optimization techniques, etc (visit http://www.antlab.ee.ucla.edu).
Dr. Rahmat-Samii has received numerous awards, including the 1992
and 1995 Wheeler Best Application Prize Paper Award for his papers
published in the IEEE Antennas and Propagation Transactions, 1999
University of Illinois ECE Distinguished Alumni Award, IEEE Third
Millennium Medal, and AMTA’2000 Distinguished Achievement
Award. In 2001, Rahmat-Samii was the recipient of an Honorary Doctorate
in Physics from the University of Santiago de Compostela, Spain.
In 2001, he was elected as a Foreign Member of the Royal Flemish
Academy of Belgium for Science and the Arts. In 2002, he received
the Technical Excellence Award from JPL. Dr. Rahmat-Samii is the
winner of the 2005 Booker Gold Medal of the International Union
of Radio Science (URSI).
The Marvels of Electromagnetic Band Gap (EBG) Structures
Periodic structures are abundant in nature and they have fascinated
artistes and scientists alike. When these structures interact with
the electromagnetic waves amazing features result with many applications
in filter designs, gratings, frequency selective surfaces (FSS),
photonic crystals/band-gaps (PBG), etc. Recently a unified classification
of various nomenclatures under the broad terminology of “Electromagnetic
Band Gap (EBG)” has been adopted. Ideally EBG structures are
3-D periodic objects that prevent or assist the propagation of the
electromagnetic waves in a specified band of frequency for all angles
and for all polarization states. However, in practice, it is almost
impossible to construct such a complete band-gap structure and frequently
partial band-gaps are achieved. FSS terminology has been used in
the microwave community while PBG terminology has been applied in
the optical community. To characterize some of the unique features
of EBG structures, the Spectral FDTD technique with Periodic Boundary
Condition/Perfectly Matched Layer (PBC/PML) has been successfully
employed. The inherent broadband analysis of the Spectral FDTD approach
provides an ideal capability when the structure is characterized
to demonstrate its frequency and angular responses. Some unique
features of EBG structures are demonstrated for microwave, antenna
and optical applications. Results of simulations, prototyping and
measurements will be presented for representative low profile antennas,
array antennas and high Q cavities. Future prospects of EBG’s
in electromagnetic engineering designs will be addressed.
Personal Communication Antennas including Human Interactions: Handheld,
Wearable and Implanted Devices
The introduction of personal communications technology has resulted
in a widespread awareness of the critical role wireless services
play in today’s communications-centered marketplace. Antennas
play paramount roles in an optimal design of the handheld, wearable
and implantable devices used in these services. Clearly in designing
these antennas the electromagnetic interaction among the antenna,
devices and the human is a key factor to be considered. Additionally,
diverse requirements for the various applications necessitate an
in-depth evaluation of various antenna configurations including
the effects of multi-path fading, human body absorption, etc. In
this presentation the following topics will be addresses: (a) The
age of personal communications, (b) Modern electromagnetic numerical
techniques for antenna performance evaluations, (c) Various popular
antenna designs, such as, monopole, inverted F, reconfigurable patches,
etc, (d) Human interactions with handheld devices, (e) wearable
antennas and implanted antennas, (f) Antenna diversity techniques
to combat multipath, (f) SAR characteristics for adults and children,
and (g) future trends in personal communication antenna developments.
Practical design and safety issues will be summarized based on our
advanced computational methodology utilizing the real life model
of a human body. Representative results will be shown for input
impedance, bandwidth performance, patterns, polarization, gain,
absorbed power, etc.
Genetic Algorithms (GA) and Particle Swarm Optimization (PSO) in
Engineering Electromagnetics
Engineers are constantly challenged with the temptation to search
for optimum solutions for complex system designs. The ever increasing
advances in computational power have fueled this temptation. The
well-known brute force design methodologies are systematically being
replaced by the state-of-the-art Evolutionary Optimization (EO)
techniques. EO techniques have been successfully applied to problems
in fields ranging from engineering to economics and artificial intelligence.
Among various EO techniques, Genetic Algorithms (GA) and Particle
Swarm Optimization (PSO) have attracted considerable attention.
GA utilizes an optimization methodology which allows a global search
of the cost surface via the mechanism of the statistical random
processes dictated by the Darwinian evolutionary concept. PSO is
a robust stochastic evolutionary computation technique based on
the movement and intelligence of swarms looking for the most fertile
feeding location. This presentation will focus on: (a) an engineering
introduction to GA and PSO, (b) demonstration of potential applications
of GAs and PSO’s to a variety of electromagnetic engineering
designs including communication antennas, satellite antennas, radar
absorbing materials for RCS applications, array antennas, and design
of electromagnetic bandgap (EBG) structures, and (c) assessment
of the advantages and the limitations of the techniques.
John
L. Volakis
ElectroScience Laboratory
Dept. of Electrical and Computer Engineering
The Ohio State University
1320 Kinnear Rd.
Columbus, OH 43212 volakis@ece.osu.edu
John L. Volakis was born in Chios, Greece in 1956 and immigrated
to the U.S.A. in 1973. He obtained his B.E. Degree in 1978 from
Youngstown State Univ., the M.Sc. in 1979 from the Ohio State University,
and the Ph.D. degree in 1982, also from Ohio State. He is currently
the Director of the Ohio State University ElectroScience Laboratory
and the Chope Chair Professor of Engineering in the Dept. of Electrical
Engineering. From 1984-2002 he was on the faculty of the University
of Michigan-Ann Arbor, College of Engineering, Dept. of Electrical
Engineering and Computer Science. He also served as the Director
of the University of Michigan Radiation Laboratory for 1998-2000.
From 1982-1984 he was with Rockwell International, Aircraft Division
(now Boeing Phantom works) and from 1978-1982 he was a Graduate
Research Associate at the Ohio State ElectroScience Lab. His research
has covered antennas, radar scattering, wireless communication,
RF propagation, bioelectromagnetics, and MEMS multiphysics design.
He is best known for introducing hybrid finite element techniques
and formal design methods for electromagnetic applications. He maintains
close collaboration with faculty in the Material Science, Mechanical,
Biomedical, Aerospace and Applied Mathematics Departments on multidisciplinary
projects, and directs the Air Force MURI on Novel Materials for
Conformal Antennas. During the past 20 years, Prof. Volakis graduated
over 30 Ph.D. students, mentored 10 post-docs and published over
220 articles in major refereed journal articles. He has also published
more than 260 conference papers, several book chapters and co-authored
two books: Approximate Boundary Conditions in Electromagnetics (Institution
of Electrical Engineers, 1995) and Finite Element Method for Electromagnetics
(IEEE Press, 1998). In 1998 he received the University of Michigan
College of Engineering Research Excellence award and in 2001 he
received his department's Service Excellence award. Prof. Volakis
was elected Fellow of the IEEE in 1996 and has served on the editorial
board of several journals. He was the 2004 President of the IEEE
Antennas and Propagation Society, and serves as the Technical Chair
of the Int. Radio Science Union (URSI). He was the 1993 IEEE AP-S
symposium general chair, held in Ann Arbor, MI and the co-chair
of the same symposium held in Columbus in 2003.
Metamaterials for Miniaturization of Narrowband and Ultra-Wideband
Antennas
It is well-recognized that materials design holds promise in developing
novel antennas that are much smaller and allow greater multi-functionality
than ever before. Such needs stem from the unprecedented growth
of wireless communications and related research that is highly fueled
by growth in commercial and defense multi-band and high bandwidth
future communication systems. This presentation will discuss how
modified materials, inductive/capacitive lumped loads and low loss
magnetic materials/crystals (Metamaterials) are impacting antenna
design with the goal of overcoming miniaturization challenges (viz.
bandwidth and gain reduction, multi-functionality etc.). Dielectric
design and texturing has, for example, led to significant size reduction
and higher bandwidth for low frequency antennas. Also, recent magnetic
photonic crystals (MPCs) and non magnetic versions of these crystals
hold a promise for antenna/array miniaturization. Formal design
methods incorporating local, global or hybrid optimizers for antenna
and their radio frequency(RF) applications will play a critical
role in materials design. Practical realizations of these new materials
are poised to challenge computational and design methods for a variety
of RF applications.
Miniature Antennas & Arrays Embedded within Magnetic Photonic
Crystals
Engineered materials, such as new material composites, electromagnetic
bandgap and periodic structures have had strong interest in recent
years due to their extraordinary and unique electromagnetic behavior.
Recently, a new class of magnetic photonic crystals (MPCs) and Double
Band Edge (DBE) that display spectral nonreciprocity were introduced.
Studies of these crystals demonstrated that MPCs exhibit the interesting
phenomena of (a) drastic incoming wave slow down and (b) significant
amplitude growth while (c) maintaining a minimal reflection at the
interface with free space . These phenomena are associated with
the diverging frozen modes that occur around the stationary inflection
points within the band diagram. Taking advantage of the frozen mode
phenomena, we demonstrate that antenna elements embedded within
the MPC and DBE structures allow for supergain effects that can
lead to novel miniature array configurations. We will demonstrate
these effects computationally using realistic materials, discuss
loss issues, and gain sensitivity to the crystal thickness. Also,
as part of the presentation, we will present an introduction to
bandgap and bandedge structures and demonstrate the differences
in the phenomena associated with the MPC and DBE crystals.
Hybrid Frequency Domain Methods for Electromagnetics: From Analysis
to Design
The decade of the nineties is highlighted with truly remarkable
progress in our ability to carry out simulations, not only for large
scale problems, but also in terms of hybridization and integration
of passive and active RF circuits for a variety of applications.
These developments have allowed for broadband antenna design, simulations
of large multilayered and multifunctional antennas with embedded
frequency selective surfaces (FSS), Metamaterial substrate designs,
MEMS analysis and design, large finite arrays and full scale aircraft
scattering analysis using first principle methods, electromagnetic
coupling and interference of systems involving passive and active
components, magnetic resonance imaging (MRI) simulations, indoor
propagation and evaluation of wireless systems, etc. What is probably
so remarkable is that a decade ago (early 90s), we had just started
looking at three-dimensional applications and the development of
practical simulation tools was seemingly far away. Today, we have
access to robust and fast three dimensional algorithms for modeling
composite materials and have also demonstrated that simulations
of practical vehicles or large finite antenna arrays and possibly
RF integrated systems can be carried out on a desktop PC. In addition,
we have delved into topology optimization/design. The latter holds
promise for novel antenna and microwave circuit design, RF filters
and RFICs for mixed signal applications, and others. This presentation
will provide an overview of frequency domain developments, with
particular focus on hybrid formulations and fast methods and their
integration with formal design methodologies for antenna applications.
Werner
Wiesbeck
Prof. Dr.-Ing. Werner Wiesbeck
Inst. für Höchstfrequenztechnik und Elektronik
Universität Karlsruhe (TH)
Kaiserstr. 12
76131 Karlsruhe werner.wiesbeck@ihe.uka.de
Werner Wiesbeck (SM 87, F 94) received the Dipl.-Ing. (M.S.E.E.)
and the Dr.-Ing. (Ph.D.E.E.) degrees from the Technical University
Munich in 1969 and 1972, respectively. From 1972 to 1983 he was
with AEG-Telefunken in various positions including that of head
of R&D of the Microwave Division in Flensburg and marketing
director Receiver and Direction Finder Division, Ulm. During this
period he had product responsibility for mm-wave radars, receivers,
direction finders and electronic warfare systems. Since 1983 he
has been Director of the Institut für Höchstfrequenztechnik
und Elektronik (IHE) at the University of Karlsruhe (TH), where
he had been Dean of the Faculty of Electrical Engineering. Research
topics include radar, remote sensing, wireless communication and
antennas. In 1989 and 1994, respectively, he spent a six months
sabbatical at the Jet Propulsion Laboratory, Pasadena. He is a member
of the IEEE GRS-S AdCom (1992 - 2000), Chairman of the GRS-S Awards
Committee (1994 – 1998, 2002 - ), Executive Vice President
IEEE GRS-S (1998 - 1999), President IEEE GRS-S (2000 - 2001), Associate
Editor IEEE-AP Transactions (1996-1999), past and present Treasurer
of the IEEE German Section (1987-1996, 2003-2007). He has been General
Chairman of the ’88 Heinrich Hertz Centennial Symposium, the
'93 Conference on Microwaves and Optics (MIOP '93), the Technical
Chairman of International mm-Wave and Infrared Conference 2004,
Chairman of the German Microwave Conference GeMIC 2006 and he has
been a member of the scientific committees and TPCs of many conferences.
For the Carl Cranz Series for Scientific Education he serves as
a permanent lecturer for radar system engineering, wave propagation
and mobile communication network planning. He is a member of an
Advisory Committee of the EU - Joint Research Centre (Ispra/Italy),
and he is an advisor to the German Research Council (DFG), to the
Federal German Ministry for Research (BMBF) and to industry in Germany.
He is the recipient of a number of awards, lately the IEEE Millennium
Award, the IEEE GRS Distinguished Achievement Award, the Honorary
Doctorate (Dr. h.c.) from the University Budapest/Hungary and the
Honorary Doctorate (Dr.-Ing. E.h.) from the University Duisburg/Germany.
He is a Fellow of IEEE, an Honorary Life Member of IEEE GRS-S, a
Member of the Heidelberger Academy of Sciences and a Member of acatech
(German Academy of Engineering and Technology).
3D Propagation Modeling and Characteristics for High Speed Mobiles
In existing wireless telecommunication systems a user can choose
either a high data rate or a high mobility. For various applications
it would be desirable to have both at the same time: the freedom
to move with a very high velocity without losing the high data rate.
Systems based on Orthogonal Frequency Division Multiplexing (OFDM)
seem to be suitable to satisfy these conditions. However, the high-speed
aspect has to be considered more closely. High-speed links between
receivers and transmitters cause varying Doppler, delay and angular
spread, which may result in inter-carrier interference (ICI) and
inter-symbol interference (ISI). ICI and ISI are both a challenge
and a limiting factor for a wireless communication system.
Applications for high-speed mobile stations are for example on
planes, fast cars, high-speed trains and so on. Several scenarios
are chosen for the simulations and partly verified by measurements.
For cars these are urban and a high way scenarios, for trains high
speed tracks with buildings or forest environment are chosen. For
the wave propagation a 3D ray-tracing tool, based on the theory
of geometrical optics (GO) and the Uniform Theory of Diffraction
(UTD), is used. The model includes modified Fresnel reflection coefficients
for the reflection and the diffraction based on the UTD. The propagation
channels are characterized by delay spread, Doppler spread and angular
spread for different situations. These statistical parameters are
compared to measurements. Dynamic simulations will be illustrated
by movies. The traffic scenarios are real world with multiple lanes,
line of sight and non line of sight.
UWB Antennas and Channel Characteristics
Spectrum is presently one of the most valuable goods worldwide as
the demand is permanently increasing and it can be traded only locally.
Since the United States FCC has opened the spectrum from 3.1 GHz
to 10.6 GHz, i.e. a bandwidth of 7.5 GHz, for unlicensed use with
up to –41.25 dBm/MHz EIRP, numerous applications in communications
and sensor areas are showing up. All these applications have in
common that they spread the necessary energy over a wide frequency
range in this unlicensed band in order to radiate below the limit.
The results are ultra wideband systems. These new devices exhibit
quite surprising behavior, especially at the air-antenna interface.
This talk presents an insight into design, evaluation and measurement
procedures for Ultra Wide Band (UWB) antennas as well as into the
characteristics of the UWB radio channel as a whole. UWB antenna
basics and principles of wideband radiators, transient antenna characterization
and UWB antenna quality measures, derived from the antenna impulse
response, are topics. EM simulations and measurements of transient
antenna properties in frequency domain and in time domain are included.
Different antennas, based on different UWB principles, will be presented.
Depending on the interest there are: ridged horn antenna, Vivaldi
antenna, logarithmic periodic antenna, mono cone antenna, spiral
antenna, aperture coupled bowtie antennas, multimode antennas, sinus
antenna and impulse radiating antennas. The channel characterization
comprises ray-tracing tools for deterministic indoor UWB channel
modeling and measurements. The advantages and drawbacks of the UWB
transmission will be discussed, depending on interest. The radiation
from different antennas will be demonstrated by movies with a pulse
excitation.
Roberto
D. Graglia
Politecnico di Torino
Dipartimento di Elettronica
Corso Duca degli Abruzzi 24
10129 Torino
ITALY roberto.graglia@polito.it
Roberto D. Graglia was born in Turin, Italy, in 1955. He received
the Laurea degree (summa cum laude) in electronic engineering from
the Polytechnic of Turin in 1979, and the Ph.D. degree in electrical
engineering and computer science from the University of Illinois
at Chicago in 1983. From 1980 to 1981, he was a Research Engineer
at CSELT, Italy, where he conducted research on microstrip circuits.
From 1981 to 1983, he was a Teaching and Research Assistant at the
University of Illinois at Chicago. From 1985 to 1992, he was a Researcher
with the Italian National Research Council (CNR), where he supervised
international research projects. In 1991 and 1993, he was Associate
Visiting Professor at the University of Illinois at Chicago. In
1992, he joined the Department of Electronics, Polytechnic of Turin,
as an Associate Professor. He has been a Professor of Electrical
Engineering at that Department since 1999. He has authored over
150 publications in international scientific journals and symposia
proceedings. His areas of interest comprise numerical methods for
high- and low-frequency electromagnetics, theoretical and computational
aspects of scattering and interactions with complex media, waveguides,
antennas, electromagnetic compatibility, and low-frequency phenomena.
He has organized and offered several short courses in these areas.
Prof. Graglia has been a Member of the editorial board of ELECTROMAGNETICS
since 1997. He is a past associate editor of the IEEE TRANSACTIONS
ON ANTENNAS AND PROPAGATION and of the IEEE TRANSACTIONS ON ELECTROMAGNETIC
COMPATIBILITY. He is currently an associate editor of the IEEE ANTENNAS
AND WIRELESS PROPAGATION LETTERS. He was the Guest Editor of a special
issue on Advanced Numerical Techniques in Electromagnetics for the
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION in March 1997. He
has been Invited Convener at URSI General Assemblies for special
sessions on Field and Waves (1996), Electromagnetic Metrology (1999),
and Computational Electromagnetics (1999). He served the International
Union of Radio Science (URSI) for the triennial International Symposia
on Electromagnetic Theory as organizer of the Special Session on
Electromagnetic Compatibility in 1998 and was the co-organizer of
the special session on Numerical Methods in 2004. Dr. Graglia served
the IEEE Antennas and Propagation Society as a member of its Administrative
Committee (AdCom), for the triennium 2006-2008. Since 1999, he has
been the General Chairperson of the biennial International Conference
on Electromagnetics in Advanced Applications (ICEAA), held in Turin.
Prof. Graglia was elected Fellow of the IEEE in 1998 for his contributions
in the application of numerical techniques in the studies of electromagnetic
structures.
Computational Electromagnetics in the Frequency Domain
Finite methods are nowadays widely used for the analysis and design
of complex electromagnetic structures. Among these methods, the
Method of Moments is the most popular numerical technique for solving
electromagnetic problems formulated in terms of integral equations,
whereas the Finite Element and the Finite Difference methods are
used to model problems in terms of differential equations. These
methods share common features, have complementary advantages and,
in advanced applications, they are often used in combination, possibly
enriched by exact or asymptotic solutions of appropriate canonical
problems. These numerical techniques have applications to many practical
problems, e.g.: EMC & EMP; shielding radiation from printed
circuits; microwave hazards; electromagnetic radiation from and
penetration into vehicles, aircraft, ships; antennas near ground;
design of frequency selective surfaces; radar scattering; etc. This
presentation is intended to provide an in-depth coverage of the
Moment Method and of the Finite Element and Finite Difference Methods,
with discussion of absorbing boundary conditions and of hybrid methods.
Particular applications can be considered in detail, such as problems
involving nonlinear and/or anisotropic materials, as well as complex
geometries. Dr. Graglia would like to keep this presentation quite
broad, with the understanding that he will be coordinating its duration
and specific focus with the inviting institutions.
Higher order modeling for Computational Electromagnetics
The progress in the area of Computational Electromagnetics, together
with the cost reduction and continuous increase of the computational
speed and power of modern computers, have contributed to the development
and broad diffusion of numerical software for the analysis and design
of complex electromagnetic structures and systems. The geometry
and the materials of these structures can nowadays be modeled by
powerful pre-processor codes able to provide high order description
of the problem to the electromagnetic “solver-software”.
To take advantage of the high quality models available by using
the modern pre-processors, several researchers have also developed
in the last decade high order basis functions for finite electromagnetic
solver codes. This presentation is intended to provide an overview
of the most recent developments obtained in this special area. After
a brief overview of the fundamentals of finite methods, an in-depth
coverage of higher order models for Moment Method and Finite Element
Method applications is provided, thereby considering interpolatory
and hierarchical higher order vector bases with a detailed discussion
of the implementation problems and of the advantages provided by
use of higher-order models. Dr. Graglia suggests this presentation
to follow that entitled “Computational Electromagnetics in
the Frequency Domain,” with the understanding that he will
be coordinating with the inviting institutions for the streamlining
of the presentation(s) according to their interests.
J(Yiannis)
C Vardaxoglou
Dr.
Nicholas E. Buris 
Zhi
Ning Chen 
Christos
G. Christodoulou
Koichi
Ito
Peter
de Maagt
Marta
Martínez-Vázquez 
Prof.
Yahya Rahmat-Samii
John
L. Volakis
Werner
Wiesbeck
Roberto
D. Graglia