2025 IEEE Wireless, Antenna & Microwave Symposium
WAMS 2025
June 5-8, 2025
Organized by
Indian Institute of Information Technology, Design and Manufacturing
Kancheepuram, Chennai
Kancheepuram, Chennai
2025 IEEE Wireless, Antenna & Microwave Symposium
WAMS 2025
June 5-8, 2025
Organized by
Indian Institute of Information Technology, Design and Manufacturing
Kancheepuram, Chennai
Kancheepuram, Chennai
Prof. Prabhakar Pathak
Professor Emeritus, ElectroScience Laboratory, Dept. of Electrical and Computer Engineering ,
The Ohio State University, Columbus, Ohio, USA.
Title of Presentation:
A Brief History of Ray Methods from Ancient to Modern Times and Their Impact on Electromagnetic Engineering Applications
Abstract:
Some of the major steps in the evolution of ray concepts and methods from about 700 B.C. to the present are briefly reviewed. Starting with the early lens making and theories of light, science of optics began to evolve and came up with the invention of the pin hole camera, the laws of reflection and refraction of light, an explanation for the formation of the rainbow, and conjectures on the finite speed of light. Later the corpuscular theory of light was introduced, but failed to explain the bending of light. it was then replaced by an early ray theory of diffraction but that failed to accurately reproduce the results of the famous double slit diffraction experiment. The latter was thus replaced by an early wave theory of light which was somewhat more accurate.In the 1800s, electromagnetic (EM) waves and light was established to be the same phenomenon. Also the speed of light was later measured and found to be the same as that predicted theoretically by equations governing EM wave propagation. Several other studies subsequently led to a significant ray theory of diffraction where diffracted ray fields existed in addition to reflected and refracted rays. The modern versions of the latter constitute the geometrical theory of diffraction (GTD) introduced in the 1950s and its uniform versions; one such being the uniform theory of diffraction (UTD) developed in the late 1970s, which still continues to be generalized for treating a wide variety of practical EM antenna and scattering problems at moderate to high frequencies.
Short Bio:
Prabhakar H. Pathak : received his Ph.D. (1973) from The Ohio State Univ.( OSU), in the Dept. of ECE where he later joined the faculty and became a Professor. Currently, he is Prof. Emeritus at OSU. He also served as an Adjunct Prof. at the Univ. of South Florida. He is regarded as a co-developer of the Uniform Geometrical Theory of Diffraction (UTD). His interests are in the development of Ray, Wave, and Beam optical methods in frequency and time domains, for solving electrically large Electromagnetic(EM) antenna and scattering problems of engineering interest. He has also developed some Hybrid methods, which combine the best features of any of the above methods with numerical methods, to solve EM problems which cannot otherwise be solved in a tractable fashion by any of the methods when used alone. His work is applicable, e.g., to the prediction of EM radiation and coupling associated with small antennas, or large phased array antennas, placed on or near large structures (such as airborne, spaceborne or naval platforms, etc.) as well as to the EM scattering by such structures. He has presented many invited lectures/short courses in the USA and abroad; also he has published 7 book chapters and several journal and conference papers. He also published a book on EM waves entitled: Electromagnetic Radiation, Scattering, and Diffraction (authors: P.H. Pathak & R.J. Burkholder). He was an Assoc. Ed. for IEEE Trans. AP; an IEEE AP distinguished lecturer (DL) during 1991-1993; chair of the IEEE AP DL program (1995-2005); member of IEEE AP-S AdCom (2010). He received the 1995 IEEE AP Schelkunoff best paper award, the 1996 George Sinclair Award from the OSU ElectroScience Lab, the 2009 ISAP best paper award, the IEEE 3rd Millenium Medal from AP-S, and the 2013 IEEE AP-S Distinguished Achievement Award. He is a Life Fellow of IEEE and member of URSI Commision B.
Prof. Desmond Sim
Feng Chia University, Taiwan
Title of Presentation:
The Fascinating Journey of Laptop Antenna Design: From Single-Band WLAN to Multiband Wi-Fi 6E/7 Band
Abstract:
This Keynote presentation will commence with a discussion on the history of the laptop computer, followed by an overview of laptop antenna designs from the early 2000s. We’ll explore various design techniques for integrating the laptop antenna into the laptop cover and discuss methods for mitigating ground effects. Additionally, we’ll examine the use of metal casing or back covers for laptops, and strategies for integrating the antenna into full metal housings. Finally, we’ll introduce recent academic advancements, such as the hinge laptop antenna, 2-antenna MIMO for laptops, and developments in laptop antennas for the Wi-Fi 6E and Wi-Fi 7 bands. We’ll also discussthe inclusion of future 6G band (7 to 15 GHz) antennas into the Laptop.
Short Bio:
Prof. SIM Chow-Yen-Desmond was born in Singapore in Feb. 1971. He received a B.S. degree in electrical and electronic engineering from the University of Leicester, Leicester, UK, in 1998, and a Ph.D. degree in the radio system group from the University of Leicester, in 2003. Since 2003/07, he has been with the Feng Chia University, Taiwan, where he is currently a Distinguished Professor since 2017/08. His research interests mainly include small antenna designs and RFID applications, focusing on 5G sub 6GHz/mmWave antenna, RFID antenna, antenna array, and laptop antenna. He has published over 200 SCI journal papers based on the abovementioned research. Prof. Sim is a Fellow of the Institute of Engineering and Technology (FIET), a Senior Member of the IEEE Antennas and Propagation Society (APS), and a Life Member of the IAET. He was an Associate Editor (AE) of the IEEE Access during 2015/08-2022/01, and has served as the AE of IEEE AWPL during 2017/08-2023/08. He is now serving as the AE of IEEE Journal of RFID, IEEE Open Journal of Antenna and Propagation, and International Journal of RF and Microwave Computer-Aided Engineering. He has served as a member of organizing committees of many conferences, such as General Chair/Co-Chair and TPC Chair/Member, etc. He was invited to serve as the Workshop/Tutorial/Invited/Keynote in many conferences. He has served as the Chapter Chair of the IEEE AP-Society, Taipei Chapter (2016/2017) and the founding Chapter Chair of the IEEE Council of RFID, Taipei Chapter (2017-2020). He received the IEEE APS Outstanding Reviewer Award (IEEE Transaction Antennas and Propagation) for eight consecutive years between 2014 and 2021. He also received the Outstanding Associate Editor Award from the IEEE Antennas Wireless and Propagation Letters in July 2018. Prof. Sim has recently been appointed as the Distinguished Lecturer of the IEEE AP-Society, serving from 2024 to 2026.
Prof. Debatosh Guha
Professor, Institute of Radio Physics and Electronics
Title of Presentation:
Art and Challenges in Low Cross-Polar Antenna Design
Short Bio:
Debatosh Guha is a Professor of the Institute of Radio Physics and Electronics, University of Calcutta, India Abdul Kalam Technology Innovation National Fellow of INAE-DST/SERB, Govt. of India, and an Adjunct Professor at the National Institute of Technology Jaipur. He is formerly HAL Chair Professor of the Indian Institute of Technology, Kharagpur, Head of the Institute of Radio Physics and Electronics, and Director of the Centre for Research in Nanoscience and Nanotechnology of the University of Calcutta. He received the B. Tech. and M. Tech. degrees in Radio Physics and Electronics and Ph. D. in microwave engineering from the University of Calcutta in 1987, 1989, and 1994 respectively. He joined the same university as an assistant professor in 1994. He had undertaken his post-doctoral research at the Canadian defense university- Royal Military College of Canada, Ontario. He has been connected to different Universities and research institutes across the globe as a regular visitor and collaborator.
Prof. Eng Leong Tan
Nanyang Technological University, Singapore
Title of Presentation:
From Fields and Potentials to Field-Impulses for Fundamental Equations of Electromagnetics – Replacing 160-Year-Old Maxwell Equations for Classical and Quantum
Abstract:
It has been 160 years now since Maxwell completed his equations of electromagnetics (EM) in 1865. Today, these equations have been written in our familiar beautiful form, in terms of fields (E and B) typically and potentials (A and phi) occasionally. However, since Maxwell-Hertz-Heaviside era, there have been longstanding dilemma to use either fields or potentials (or both) for EM, and for the potentials, which gauge condition should be imposed, e.g. Lorenz gauge, Coulomb gauge, etc. The present talk will introduce new gauge-invariant physical quantity of field-impulses for new fundamental equations of electromagnetics, which can unify all electrostatics, magnetostatics, electrodynamics and quantum-EM interactions. The concept and utilization of field-impulses will be shown to not only resolve the century-old field-potential/gauge dilemma, but also aptly describe quantum-EM (e.g. Aharonov-Bohm) effects. Therefore, in lieu of the traditional fields and/or potentials, the field-impulses can serve as the new fundamental EM quantities, which are useful for replacing the 160-year-old Maxwell equations and other (Lorenz/Coulomb/etc.) ones for classical and quantum. Theoretical formulation and efficient computation with fundamental implicit schemes of finite-difference-time-domain methods will be presented. Several mobile apps for technology-enhanced-learning of electromagnetics and circuits will also be demonstrated.
Short Bio:
Eng Leong Tan (SM’06) received the B.Eng. (Electrical) degree with first class honors from the University of Malaya, Malaysia, and the Ph.D. degree in Electrical Engineering from Nanyang Technological University (NTU), Singapore. From 1999 to 2002, he was with Institute for Infocomm Research, Singapore and since 2002, he has been with the School of Electrical & Electronic Engineering, NTU. His research interests include computational electromagnetics (CEM), multi-physics (including quantum, acoustics, thermal), RF/microwave circuit and antenna design. He has published more than 130 journal papers and presented more than 90 conference papers. He and his students received numerous paper and project awards/prizes including: 2019 Ulrich L. Rohde Innovative Conference Paper Award on Computational Techniques in Electromagnetics, First Prize in 2014 IEEE Region 10 Student Paper Contest, First Prize in 2014 IEEE MTT-S Student Design Contest on Apps for Microwave Theory and Techniques, First Prize in 2013 IEEE AP-S Antenna Design Contest, etc. He was the recipient of the IEEE AP-S Donald G. Dudley Jr. Undergraduate Teaching Award with citation: “For excellence in teaching, student mentoring, and the development of mobile technologies and computational methods for electromagnetics education.” He has been actively involved in organizing many conferences, including General Chair of PIERS 2017 Singapore, TPC Chair of ICCEM 2020, APCAP 2018 (Auckland) and 2015 (Bali), as well as TPC Chair of IEEE APS/URSI 2021. He is a Fellow of ASEAN Academy of Engineering and Technology, and a Fellow* of the Electromagnetics Academy in recognition of distinguished contributions to “Computational electromagnetics and education”. He has been appointed as the IEEE AP-S Distinguished Lecturer for 2025-2027.
Dr. Nelson J. G. Fonseca
IEEE Fellow
Title: Recent Advances in Beamforming Techniques and Technologies Applied to Millimeter-Wave Multiple Beam Antennas.
Abstract: Recent developments in both terrestrial and non-terrestrial networks are focused on multiple beam antenna systems to increase data rates and to provide more flexibility in resource allocation. Some synergies between space and terrestrial systems are emerging as the fifth generation (5G) of wireless systems introduce millimeter-wave frequencies for short range and indoor applications. This provides a unique opportunity for transfer of technology, as requirements for satcom user terminals and cell tower antennas present some similarities. While phased array antennas are getting a great deal of attention, their cost still remains high for mass market applications and alternative solutions based on simpler beamforming techniques are being considered. These solutions are also of interest in radar systems and microwave instruments combining high resolution and wide angular field of view.
This talk will review recently proposed beamforming techniques and technologies, extending the capabilities of known concepts including seminal contributions such as the Butler matrix and the Luneburg lens. A comparative discussion will also be provided, addressing the respective advantages and limitations of the presented techniques.
Nelson J. G. Fonseca (IEEE Fellow) received the M.Eng. degree from Ecole Nationale Supérieure d’Electrotechnique, Electronique, Informatique, Hydraulique et Télécommunications (ENSEEIHT), Toulouse, France, in 2003, the M.Sc. degree from the Ecole Polytechnique de Montreal, Quebec, Canada, also in 2003, and the PhD degree from Institut National Polytechnique de Toulouse – Université de Toulouse, France, in 2010, all in electrical engineering.
He currently works as Innovation Manager for Anywaves, Toulouse, France, contributing to the development of their custom space-segment antennas portfolio. He is also the founding director of 3SPACE Innovation, Paris, France, a startup developing novel ground-segment and terrestrial wireless communication antenna systems. His research interests include multiple beam antennas for space missions, beamformer theory and design, ground terminal antennas and novel manufacturing techniques. He has authored or co-authored more than 320 papers in peer-reviewed journals and conferences, and has over 50 patents issued or pending.
Dr. Fonseca is currently serving as Associate Editor for the IEEE Transactions on Antennas and Propagation and for the IET Microwaves, Antennas and Propagation. He is also a Topic Editor for the IEEE Journal of Microwaves. He served as Associate Editor for the Transactions on Microwave Theory and Techniques from 2020 to 2022, and was co-Guest Editor of two focused issues of the IEEE Microwave Magazine in 2022 and 2023. He served as Vice-Chair of the newly founded MTT-S Technical Committee on Microwave Aerospace Systems (TC-29) from 2020 to 2021 and as Chair from 2022 to 2023. He served as TPC Co-Chair of the 18th European Conference on Antennas and Propagation (EuCAP2024) and is currently serving as Vice-Chair of the 19th European Conference on Antennas and Propagation (EuCAP2025). He received several prizes and awards, including the Best Applied Technology Antenna Paper Award at EuCAP 2022 and the 2024 IEEE Journal of Microwaves Best Paper Award.