KEYNOTE & INVITED SPEAKERS

KEYNOTE

Prof. Prabhakar H. Pathak

Professor Emeritus, The Ohio State University, ECE Dept., Columbus, Ohio, USA Adjunct Professor, University of South Florida, Tampa, Florida, USA
pathakph@gmail.com

1. REACTION THEOREMS FOR COMPACT RANGE ANALYSIS

ABSTRACT: Compact range technology provides sensitive systems for near zone measurements of far zone antenna and scattering patterns. The compact range system analyzed here consists of a focal fed offset parabolic reflector antenna, whose near zone field approximates a uniform plane wave over a significant fraction of its projected aperture. The justification for the near field measurements of far zone patterns is obtained here using generalized reciprocity or reaction theorems together with the uniform geometrical theory of diffraction (UTD). Dual reflector and other compact ranges can be analyzed similarly. This reaction theorem based analysis also directly provides an analytical estimate of the errors in the measurements due to deviation of the compact range field from that of a uniform plane wave with a prescribed polarization. These errors result from various factors such as the effects of diffraction by reflector edges, the effects of cross polarization from the reflector surface and the generally tapered pattern of the feed for the compact range reflector. Methods for reducing these errors are discussed. Additional errors also result from multiple wave interactions between the compact range and the antenna or scattering object being measured, etc. The analysis developed here can be employed to systematically quantify errors in the measurements, and hence to optimize the performance of compact ranges. It is important to note that one measures only reactions and not the radiated/scattered fields directly, for only reactions are observables, such as voltages and currents, while fields are not even though fields of course exist. Hence, it becomes natural to use reaction theorems for the analysis of antenna/scattering measuring systems.

Prabhakar H Pathak : received his Ph.D. (1973) in Electrical Engineering from the Ohio State University (OSU). Currently he is Professor Emeritus at OSU, and Adjunct Professor at the Univ. of South Florida. Prof. Pathak is regarded as a codeveloper of the uniform geometrical theory of diffraction (UTD). His research interests continue to be in the development of new UTD ray solutions in both the frequency and time domains, as well as in the development of fast beam and hybrid (ray and numerical) methods for analyzing electrically large electromagnetic (EM) antenna and scattering problems, including reflector systems and conformal phased arrays. His work includes the development of analytical tools for predicting EM radiation and mutual coupling associated with antennas/arrays on large airborne/spaceborne platforms. He is also working on novel methods related to near field measurements of far zone antenna patterns. Prof. Pathak has been presenting short courses and invited talks at conferences and workshops both in the US and abroad. He has authored/coauthored over hundred journal and conference papers, as well as contributed chapters to seven books. Prior to 1993, he served two terms as an associated editor for IEEE Trans AP. He was appointed IEEE AP-S distinguished lecturer during 1991-1993, and was later appointed as chair of the distinguished lecturer program for the IEEE AP-S during 1995-2005. He was an IEEE AP-S AdCom member in 2010. He received the 1996 Schelkunoff best paper award from IEEE AP-S; the ISAP 2009 best paper award, the George Sinclair award (1996) from the OSU ElectroScience Laboratory, and the IEEE Third Millenium medal from AP-S in 2000. Prof. Pathak received the IEEE AP-S distinguished achievement award in 2013. He is an IEEE Life Fellow and a member of URSI commission B.


Prof. Levent Sevgi

Electrical – Electronics Engineering Department
OKAN University, Engineering Faculty,
Tuzla – ISTANBUL
levent.sevgi@okan.edu.tr; ls@leventsevgi.net

2. FROM DESIGN TO MARKET: EMC ENGINEERING

ABSTRACT: The role of EM fields in our lives has been increasing. Communication, remote sensing, integrated command/control/surveillance systems, medicine, environment, education, marketing, defense are only a few areas where EM fields have critical importance. We have witnessed the transformation from “Engineering Electromagnetics” to “Electromagnetic Engineering” for the last few decades after being surrounded by electromagnetic waves everywhere. Among many others, electromagnetic compatibility (EMC) engineering is the most important one since it necessitates establishing an intelligent balance between strong mathematical background (theory), engineering experience (practice), and modeling and numerical computations (simulation).

This tutorial explores the fundamentals of EMC engineering and examines the concepts and underpinnings of electromagnetics. It highlights the procedures from design to market for both technical and non-technical issues, including market control, accreditation, calibration, EM signal environments, noise, interference, EMC tests and measurement, signal integrity, and EMC mitigation and protection. Electromagnetic model, circuit model, two-port circuit definitions, grounding, common and differential model currents, and microstripline circuits are explored. It also covers antennas and antenna calibration, including communication antennas, normalized site attenuation (NSA), loop antennas, and loop antenna calibration (LAC). Practical aspects and challenging issues in different sectors – from defense industry to telecommunications, space industry to automotive sector and fast trains, to commercial electronics, white goods, etc., are discussed.

Prof. Sevgi Born in Akhisar / Turkey on 1st January 1958.

He received his BsEE, MsEE and PhD degrees in Electronic Engineering from Istanbul Technical University (ITU) in 1982, 1984 and 1990, respectively. In 1987, while working on his PhD, he was awarded a fellowship that allowed him to work with Prof. L. B. Felsen at Weber Research Institute / New York Polytechnic University York for two years. His work at the Polytechnic concerned the propagation phenomena in non-homogeneous open and closed waveguides.

He was with Istanbul Technical University (1991–1998), TUBITAK-MRC, Information Technologies Research Institute (1999–2000), Weber Research Institute/Polytechnic University in New York / USA (1988–1990), Scientific Research Group of Raytheon Systems, Canada (1998 – 1999), Center for Defense Studies, ITUV-SAM (1993 –1998 and 2000–2002) and with University of Massachusetts, Lowell (UML) MA/USA as a full-time faculty (2012 – 2013) and with Dogus University (2001-2014). Since Sep 2014, he has been with Okan University.

He has been involved with complex electromagnetic problems and complex communication and radar systems for nearly three decades. His research study has focused on propagation in complex environments, analytical and numerical methods in electromagnetic, EMC/EMI modeling and measurement, communication, radar and integrated surveillance systems, surface wave HF radars, FDTD, TLM, FEM, SSPE, and MoM techniques and their applications, RCS modeling, bio-electromagnetics. He is also interested in novel approaches in engineering education, teaching electromagnetics via virtual tools. He also teaches popular science lectures such as Science, Technology and Society.

He is a Fellow member of the IEEE, an AdCom member of the IEEE Antennas and Propagation Society (AP-S) (2013 - 2015), the writer/editor of the “Testing ourselves” Column in the IEEE Antennas and Propagation Magazine (Feb 2007 -) and a member of the IEEE AP-S Education Committee (Jun 2006 -), a member of the IEEE AP-S Field Award Committee (Jan 2018 -). He is also a member of several editorial boards (EB), such as the IEEE Antennas and Propagation Magazine (Feb 2007 -), the IEEE Access (2017 - 2019), Wiley’s International Journal of RFMiCAE (Jan 2002 -), etc.

He has published more than 10 books in English and Turkish, nearly 200 journal/magazine papers/tutorials and attended 100+ international conferences/symposiums.

His three books Complex Electromagnetic Problems and Numerical Simulation Approaches (2003), Electromagnetic Modeling and Simulation (2014) and Radiowave Wave Propagation and Parabolic Equation Modeling (2017, with Gökhan Apaydin) were published by the IEEE Press & Wiley. His book A Practical Guide to EMC Engineering (2017) was published by ARTECH House.


Prof. Kin-Lu Wong

Kin-Lu WONG, National Chair Professor, IEEE Fellow, Thomson Reuters Highly Cited Researcher Elsevier Most Cited Researcher, IEEE AP-S AdCom Member/Transactions Track Editor Distinguished Chair Professor, Dept. of Electrical Engineering National Sun Yat-sen University, Kaohsiung 80424, Taiwan https://scholar.google.com.tw/citations?user=0TfInb0AAAAJ&hl=zh-TW

3.Multi-Gbps High-Dimensional MIMO for 5G Mobile Devices and MIMO Capacity/Throughput Verification

ABSTRACT: High-Dimensional MIMO antennas are promising for application in next-generation mobile devices such as the smartphone for the fifth-generation (5G) communications to achieve multi-Gbps throughput with user’s hand holding and body blocking. It has recently been demonstrated that larger than 12 decoupled MIMO antennas are feasible to be embedded in the limited space in the smartphone to operate with 12 MIMO streams. In this case, larger than 5-Gbps throughput can be achieved with 100-MHz bandwidth only. A MIMO capacity/throughput testbed has also been developed for MIMO performance verification. Results of the multi-Gbps High-Dimensional MIMO in typical indoor and outdoor propagation scenarios will be presented and its potential applications for 5G communications will be discussed.

Prof. Kin-Lu Wong is a National Chair Professor of Ministry of Education, a Distinguished Researcher of Ministry of Science and Technology, a Distinguished Chair Professor with National Sun Yat-sen University, Taiwan, a Thomson Reuters Highly Cited Researcher, an Elsevier Most Cited Researcher, an IEEE Fellow, an elected IEEE Antennas and Propagation Society AdCom member, and a Track Editor of IEEE Transactions on Antennas and Propagation.

Prof. Wong was Senior Vice President of National Sun Yat-sen University in 2007~2012. He has graduated 55 PhD students, published 570 refereed journal papers, and 300 conference articles, and has been granted over 300 patents. Prof. Wong’s published articles have been cited over 26,700 times with an H-index of 77 in Google Scholar. He was General Chairs of 2012 APMC (Asia-Pacific Microwave Conference), 2014 ISAP (International Symposium on Antennas and Propagation), and 2016 APCAP (Asia-Pacific Conference on Antennas and Propagation) held in Kaohsiung, Taiwan. He has been an International Steering Committee member for many international conferences.


Dr Clency Lee-yow.

Dr. Clency Lee-Yew graduated from Queen Mary Collage in London, Uk with a B.Sc. and a Ph.D.in Electrical Engineering. He spent one year with the university as a research assiatant before joining Com Dev Internation in Cambridge, Ontario, Canada where he worked as a senior engineer designing a variety of reflector antenna feeds for satellite communication. In 1994, he joined Custom Microwave Inc. (CMI) and took over as VP of operations. He became President of CMI in 1999 and has since transformed the company into a major supplier of high performance reflector antenna feeds for satellite communications. Since that time,CMI has supplied feeds for more than 220 sate llites.

4. Feed Design, Manufacture, Test and Qualification for Satellite Applications

ABSTRACT: Most communication satellites use reflector antennas to simultaneously transmit and receive RF signals for communicating with antennas on the ground. A key element of the reflector antenna system is the feed. Many factors should be considered during the feed design process to arrive at a cost-effective solution. These include bandwidth, polarization, power handling, passive inter-modulation levels, edge taper, isolation between the transmit and receive bands, insertion loss, envelope, port locations, mass, and environmental requirements. This presentation provides an overview of how these factors affect the choice of components, their design approach, choice of material, method of fabrication, integration and test methods used to realize a typical high-performance feed for satellite application.


INVITED SPEAKERS

Dr. C. J. Reddy

Vice President of Business Development – Electromagnetics, Americas Altair
cjreddy@altair.com

1. Hybrid Computational Techniques for Analysis of Airborne Antennas and Radomes

ABSTRACT:With growing communications, nowadays there are increasingly sophisticated antenna systems with associated electronics aboard aircrafts. Advances in electromagnetic (EM) simulations have significantly improved the design process for such systems, resulting in reduced testing time and costs. EM simulations are widely used in the aerospace industry for antenna design, placement and airborne radars. Simulations can be broadly categorized into full-wave and asymptotic solutions. Asymptotic solutions also solve Maxwell Equations, but with appropriate assumptions and approximations. While full wave solutions are accurate, they are computationally expensive when applied to electrically large structures such as aircrafts. While asymptotic solutions may provide an alternative, they may not be suitable for modeling complex antenna geometries while mounted on the aircraft. In this talk, we will review hybrid computational techniques that are becoming popular to analyze and optimize antenna designs as well as antenna placement on air borne platforms. Efficient hybrid methods for airbone radome analysis will also be presented.

BIO: Dr. C.J. Reddy :is the Vice President, Business Development-Electromagnetics for Americas at Altair Engineering, Inc.(www.altair.com). At Altair, he is leading the marketing and support of commercial 3D electromagnetic software, FEKO (http://www.altairhyperworks.com/product/FEKO) in Americas. Dr. Reddy was a research fellow at the Natural Sciences and Engineering Research Council (NSERC) of Canada and was awarded the US National Research Council (NRC) Resident Research Associateship at NASA Langley Research Center. While conducting research at NASA Langley, he developed various computational codes for electromagnetics and received a Certificate of Recognition from NASA for development of a hybrid Finite Element Method/Method of Moments/Geometrical Theory of Diffraction code for cavity backed aperture antenna analysis. Dr. Reddy is a Fellow of IEEE, Fellow of Applied Computational Electromagnetics Society (ACES) and a Senior Member of Antenna Measurement Techniques Association (AMTA). Dr. Reddy served on ACES Board of Directors from 2006 to 2012 and again from 2015 to 2018. Dr. Reddy was awarded Distinguished Alumni Professional Achievement Award by his alma mater, National Institute of Technology (NIT), Warangal in 2015. He published 37 journal papers, 77 conference papers and 18 NASA Technical Reports to date. Dr. Reddy is a co-author of the book, “Antenna Analysis and Design Using FEKO Electromagnetic Simulation Software,” published in June 2014 by SciTech Publishing (now part of IET). Dr. Reddy was the General Chair of ACES 2011 Conference held in Williamsburg, VA during March 27-31, 2011. And also ACES 2013 conference, Monterey CA (March 24-28, 2013) as well as the General Chair of ACES 2015 conference held in Williamsburg, Virginia during March 22-26, 2015. He was the Co-General Chair of 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting held during July 6-11, 2014 in Memphis, TN. Dr. Reddy is the General Chair for AMTA 2018 conference to be held in Williamsburg, Virginia during November 3-8, 2018.

Title of the Proposed Special Session:Advances in Commercial Electromagnetic Simulation Tools
Organizer: Dr. C. J. Reddy, Altair Engineering, Inc, Hampton VA 23666, email: cjreddy@altair.com
Description: Commercial EM Simulations tools are being widely used by the members of Antennas and Propagation Society members. Over the past three decades these tools have matured to be reliable and productive. All of them are striving to incorporate latest developments in computational electromagnetics, such as Characteristic Mode Analysis (CMA), GPU computing, Domain Decomposition (DD), Adaptive Cross Approximation (ACA) to mention a few. Papers will be invited from the technical team members of commercial tools to present latest advancements in their tools and also from leading antenna engineers from industry who applied these tools successfully. The session will provide a forum for the conference attendees to learn new developments in commercial tools as well as their applications to solve complex engineering problems in a single session