Workshop/Tutorial Session
| ID | WS/TU Title | Organizer |
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| WG#1 | EMP, HEMP, and IEMI Threats—Theory, Mitigation, and Standards | Janet O’Neil (ETS-Lindgren, USA) Yuichi Hayashi (NAIST, Japan) |
| WG#2 | High Power Microwave Sources | EunMi Choi (UNIST, Republic of KOREA) |
| WG#3 | Sensing-based Physical Artificial Intelligence | Jun Han (KAIST, Republic of KOREA) |
| TU#1 | Resilience and Protection of Critical Infrastructure from HPEM Environments | Richard Hoad (QinetiQ, UK) |
| TU#2 | Overview of HPEM Sources, Antennas and Applications across Various Frequency Bands | Dave Giri (Pro-Tech, USA) |
| WS/TU ID | WG#1 |
| Title | EMP, HEMP, and IEMI Threats—Theory, Mitigation, and Standards |
| Session Organizer | Janet O’Neil / ETS-Lindgren Yuichi Hayashi / NAIST |
| Session Description | This workshop addresses the growing risks posed by Intentional Electromagnetic Interference (IEMI) and High-Altitude Electromagnetic Pulse (HEMP) to modern electronic systems and critical infrastructure. As the availability of disruptive sources increases and systems become more vulnerable, even partial failures can severely impact public life. The session begins with “Theory Behind EMP/HEMP/IEMI: Causes, Effects, History, and Standards,” offering foundational insights into electromagnetic pulse phenomena. “Lightning, HEMP and General Pulse Mitigation Strategies” explores practical countermeasures, followed by “Protection Implementation with Filters, Filter Testing and Grounding,” which presents hands-on techniques for shielding sensitive electronics. “Information Security Threats Caused by Intentional Electromagnetic Interference (IEMI)” highlights the intersection of cybersecurity and electromagnetic vulnerability, while “HEMP Measurement Techniques IEC 61000-4-24” introduces standardized approaches for evaluating system resilience. Participants will gain a comprehensive understanding of both traditional and modern protection strategies, including resilience engineering and functional safety. The workshop concludes with an update on evolving industry standards, equipping attendees with actionable knowledge to safeguard infrastructure against electromagnetic threats. Speakers and their corresponding affiliations are active technical contributors to the industry standards committees, including IEC SC77C, as well as members of IEEE EMC Society TC-5 on High Power Electromagnetics |
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Theory Behind EMP/HEMP/IEMI: Causes, Effects, and HistoryGarth D’Abreu
The currents and voltages induced in electronic circuits by EMP and other high energy natural or man made sources can have catastrophic effects on vulnerable equipment, and these risks have been recognized for several decades. In this presentation, we will take a high level look at several of these high energy sources and introduce the mitigation and protection methods available for both conducted and radiated threats. The design of protection systems is critical for any application, and mistakes or gaps in understanding the threat, the system architecture, or the selection of components can easily compromise overall effectiveness.
Garth D’Abreu is the Director of Automotive Solutions at ETS Lindgren, based at the company’s corporate headquarters in Cedar Park, Texas. He has primary responsibility for design and development within the Systems Engineering group, specializing in turnkey solutions for Automotive EMC, Wireless, and OTA test integration.
He serves as ETS Lindgren’s subject matter expert for the research and development of reverberation chambers and GTEM cells, and he also supports the RF filters, EMP applications, and wireless device test systems teams. His extensive experience aligns well with the diverse measurement techniques and chamber design considerations required for modern Automotive EMC, antenna measurement, and wireless system testing. Mr. D’Abreu is a Senior Member and past Distinguished Lecturer of the IEEE EMC Society, and an active participant in standards development through the U.S. ISO and CISPR D automotive EMC committees, as well as the ANSI C63.25 committee. He has more than 35 years of experience in the RF industry. He holds a BSc in Electronics & Communications Engineering from North London University, UK. |
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EMP Hardened Infrastructure: Considerations for Shield Effectiveness and Shielding ComponentsSanjay Singh
Taking cue from the previous topic “Theory Behind EMP/HEMP/IEMI: Causes, Effects, History, and Standards”, I will focus on basic considerations for Shield Effectiveness and the various shielding components that go into the making of an EMP hardened infrastructure. My topic will also briefly touch upon a comparison between requirements of an EMP hardened facility versus an EMC Test chamber. My breadth of experience with multiple EMP projects and the challenges faced may be helpful with keeping the interest alive and with addressing questions from the attendees.
Managing Director at ETS-Lindgren Engineering India Pvt Ltd. where he joined in Feb 2014 after 20 years of service in the Indian Navy in technical leadership roles handling Electronics, Sensors, Power Generation/ Distribution, Fire Control Systems, Radars, and Communications. Overall, he has experience of over three decades leading teams responsible for operations & maintenance, project management, sales & marketing, equipment induction, risk mitigation, testing, procurement, management of contracts, etc. Current focus areas include MIL STD/ Commercial test chambers, EMP hardening of critical infrastructure, Instrumentation for EMI/EMC compliance testing of Electronics, Automotive, Medical devices, OTA Wireless testing, Antenna testing, etc. An alumnus of Indian Institute of Technology -Delhi (M Tech), Jamnalal Bajaj Institute of Management Sciences (exec. MBA), National Defence Academy.
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Lightning, HEMP and General Pulse Mitigation StrategiesTobias Okech
This presentation reviews generalized mitigation strategies for lightning and high-altitude electromagnetic pulse (HEMP) environments for control lines. A theoretical framework is developed and applied to practical approaches ranging from clamping devices to multi-stage filters. A three-layer mitigation concept is proposed, and the efficacy and limitations of the approach are discussed.
Tobias Okech is a Senior Engineer at MPE Limited located in Liverpool, United Kingdom. He earned his BSc degree in Physics and an MSc degree in Radiometrics Modeling and Instrumentation from the University of Liverpool, in 2008 and 2010, respectively. Tobias started his career in software engineering and data science, then transitioned to instrumentation, working at a Mass Spectrometry company on magnetic sector ICP-MS systems. His experience in electronics, amplifiers, and detector modeling helped him progress into Development Engineering and Project Management, driving a steady stream of technical improvements to several product lines, including RF and EMP power, signal, and data line filters. Currently, his research interests include utilizing specialized software for digital IIR and FIR filter design to gain a deeper insight into the theoretical underpinnings of filter technology.
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Intentional Electromagnetic Interference as a Physical Layer Security Threat to Electronic SystemsYuichi Hayashi
Intentional Electromagnetic Interference (IEMI) is a critical physical-layer attack vector that threatens information security. This tutorial explores how injected electromagnetic fields compromise system integrity and confidentiality without physical access. We detail how targeted IEMI causes data-dependent faults to bypass security, corrupts communication buses for command injection, and enables information leakage. Through experimental case studies, we prove the real-world viability of these threats. Finally, we analyze adversarial models and present hardware and system-level countermeasures. Ultimately, this tutorial aims to bridge the EMC and hardware security communities and to outline directions for robust defenses for next-generation cyber-physical systems.
Yuichi Hayashi is a Professor at Nara Institute of Science and Technology. His research interests include electromagnetic compatibility and hardware security. He is the Chair of the EM Information Leakage Subcommittee in IEEE EMC Society Technical Committee 5 and serves as a member of the IEEE EMC Society Board of Governors. He has received numerous awards and honors, including the IEEE International Symposium on Electromagnetic Compatibility Best Symposium Paper Award (2013), the IEEE Electromagnetic Compatibility Society Technical Achievement Award (2021), and the Richard B. Schulz Best Transactions on EMC Paper Award (2024).
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HEMP Measurement Techniques IEC 61000-4-24TaeHeon Jang
This presentation provides a comprehensive overview of the measurement techniques defined in IEC 61000 4 24 for evaluating the performance of HEMP protection devices and combination filters. The standard outlines test facilities, procedures, and performance criteria essential for ensuring system resilience against early time, intermediate time, and conducted electromagnetic pulse threats.
The presentation explains test methods for protective components such as GDTs, MOVs, and two port SPDs, emphasizing the use of controlled fixtures, proper impedance matching, and accurate measurement of residual current and voltage. A major focus is the Pulsed Current Injection (PCI) method used to assess HEMP combination filters, including verification of test levels, characterization of double exponential waveforms, and procedures for capturing peak values, rise time, and root action. The session also introduces measurement techniques for RF antenna port protectors, addressing front door coupling mechanisms and frequency dependent test waveforms such as double exponential pulses and damped sinusoids. Key performance criteria, residual limits, and post test functional checks are discussed to support consistent and repeatable evaluations. Finally, the presentation highlights future directions for IEC 61000 4 24 and IEC 61000 5 5, including expanding the scope to broader conducted disturbances, establishing standardized test methods for RF limiters, and addressing the growing need for post installation and in service verification of HEMP filters. Participants will gain a practical and technically grounded understanding of how to apply IEC 61000 4 24 in both laboratory and field environments to ensure robust electromagnetic protection.
TaeHeon Jang is the Convenor of IEC TC77C MT 61000 4 24, leading the international revision of the HEMP combination filter test standard. He has made long standing technical contributions to IEC SC77C, particularly in developing and advancing test methods for HEMP protection devices. In recognition of his leadership, he received the IEC 1906 Award for his contributions to SC77C projects and his technical leadership in HEMP combination filter test methods. He currently serves as Executive Director at I Spec Co., Ltd., continuing to support global standardization efforts in high power electromagnetics and EMC.
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| WS/TU ID | WS#2 |
| Title | High Power Microwave Sources |
| Session Organizer | EunMi Choi / UNIST |
| Session Description | This session focuses on recent progress in HPM source development, system integration, and experimental validation, with an emphasis on bridging classical device physics with modern computational work. Topics include high power microwave oscillators and amplifiers such as BWOs, MILO, TWT, and gyrotrons, pulsed power, beam-wave interaction, and measurement techniques. HPM research for in-house code development will be also covered. |
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HPM Sources: Gyrotrons, Theory and Experiments and ApplicationsEunMi Choi
EunMi Choi is a professor in department of electrical engineering at Ulsan National Institute of Science and Technology (UNIST). She is currently leads the THz Vacuum Electronics and Applied Electromagnetics (TEE) laboratory as a principle investigator since 2010. Her main contribution in the field includes high power vacuum electronics development (gyrotrons, TWTs, etc) and its application for nuclear fusion plasma heating and current drive, remote detection of radioactive materials experimentally, and energy recirculating microfabricated vacuum electronics amplifier source development. Her current research interests span from development of electron beam based high power millimeter and THz sources, ultra-compact THz sources at 300 GHz and beyond by means of micro-fabrication techniques, orbital angular momentum (OAM) beams generation for communication system and exotic electromagnetic waves generation, to their possible applications in novel technique in remote detection of radioactive materials, and plasma interaction with exotic electromagnetic waves.
EunMi Choi is a professor in department of electrical engineering at Ulsan National Institute of Science and Technology (UNIST). She is currently leading the THz Vacuum Electronics and Applied Electromagnetics (TEE) laboratory as a principal investigator since 2010. Her main contribution in the field includes high power vacuum electronics development (gyrotrons, TWTs, etc) and its application for nuclear fusion plasma heating and current drive, remote detection of radioactive materials experimentally, and energy recirculating microfabricated vacuum electronics amplifier source development. Her current research interests span from development of electron beam based high power millimeter and THz sources, ultra-compact THz sources at 300 GHz and beyond by means of micro-fabrication techniques, orbital angular momentum (OAM) beams generation for communication system and exotic electromagnetic waves generation, to their possible applications in novel technique in remote detection of radioactive materials, and plasma interaction with exotic electromagnetic waves.
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HPM Sources: BWO, MILO, Pulsed Power, etcSun-Hong Min
High-power microwave (HPM) sources based on relativistic electron beams remain essential platforms for generating gigawatt-level microwave radiation in pulsed regimes. This workshop will provide a focused tutorial on the physics, design, and experimental validation of HPM oscillators driven by intense electron beams, with particular emphasis on backward wave oscillators (BWOs), magnetically insulated line oscillators (MILOs), and associated pulsed power technologies. The session will begin with a concise review of beam–wave interaction physics in slow-wave structures, including dispersion engineering, synchronism conditions, and nonlinear saturation mechanisms in relativistic regimes. Special attention will be given to beam instabilities that influence mode competition, efficiency, and spectral stability. Practical design considerations for BWO and MILO systems will be discussed, covering slow-wave structure optimization, impedance matching, magnetic insulation, and output coupling strategies.
A dedicated segment will address pulsed power drivers for HPM sources, including pulse forming networks, Marx generators, and high-voltage switching technologies. The interplay between pulse shaping, beam quality, and microwave generation efficiency will be analyzed from both theoretical and experimental perspectives. Measurement techniques for gigawatt-class microwave characterization—such as calibrated antenna diagnostics, attenuation chains, and time-resolved spectral analysis—will also be introduced. By bridging classical vacuum electronic device theory with modern numerical modeling and experimental validation, this tutorial aims to provide participants with a systematic understanding of HPM source development. The session is designed for researchers and engineers working on advanced electromagnetic systems who seek both foundational insight and practical guidance for next-generation HPM platforms.
Sun-Hong Min received the Ph.D. degrees in physics from the Department of Physics and Astronomy, Seoul National University (SNU), Seoul, 2013. He has studied high-power microwaves (HPM), mm-waves and THz vacuum electronics device (VED), pulse power machine, and radiation physics, over the past 20 years. His main fields for VEDs are BWO, MILO, klystron, magnetron, and cyclotron. He used to work as a Postdoctoral Researcher with the Center for THz-Bio Application System, Seoul National University, Seoul, from 2013 to 2015. He worked as a Senior Researcher with Korea Institute of Radiological and Medical Science (KIRAMS) from 2015 to 2023. He currently works as a Principal Researcher with Center for Applied Electromagnetic Research, Advanced Institutes of Convergence Technology (AICT), Suwon-si, Gyeonggi-do 16229, Republic of Korea since 2023
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HPM Sources Code DevelopmentDong-Yeop Na
This session presents the fundamentals of an electromagnetic particle-in-cell algorithm coupled with a finite-element time-domain field solver on irregular meshes. The method is based on differential geometry and discrete exterior calculus, ensuring consistent discretization of Maxwell’s equations, exact charge conservation, and structure preservation.
Dr. Dong-Yeop Na is an Assistant Professor in the Department of Electrical Engineering at Pohang University of Science and Technology (POSTECH), where he has led the Applied Computational Electromagnetics (ACEM) Laboratory since August 2022. His research centers on computational classical and quantum electrodynamics. In particular, his current interests include discrete exterior calculus–based particle-in-cell algorithms for high-power microwave device modeling; secondary electron emission and multiscale interactions between circuits and high-energy plasma systems; ultra-wideband, numerically stable FEM solvers based on the A-Phi potential and generalized Lorenz gauge; numerical frameworks for open and dissipative quantum-optical systems; LEO-to-ground propagation modeling based on 3D atmospheric refractivity reconstruction from numerical weather prediction data; and optimization of metasurface-based asymmetric IR-transparent passive radiative cooling systems
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| WS/TU ID | WS#3 |
| Session Organizer | Jun Han / KAIST |
| Title | Sensing-based Physical Artificial Intelligence |
| Session Description | The proposed workshop, Sensing-based Physical Intelligence, targets the emerging convergence of electromagnetic sensing, acoustic sensing, optical/vision sensing, and AI-driven perception for cyber-physical intelligence. The objective is to explore how diverse sensing modalities—ranging from RF signals (mmWave radar, Wi-Fi CSI, RF imaging), to acoustic and vibration sensing, to optical and vision-based systems—can jointly enable machines to perceive, reason about, and interact with the physical world in real time. The session will cover sensing fundamentals, multimodal signal processing, machine learning pipelines for physical inference, system integration, and security and privacy implications of pervasive sensing. This workshop is original in framing sensing not as isolated sensing technologies but as a unified foundation for Physical Intelligence: the ability of machines to understand environments, human behavior, and hidden physical states through heterogeneous physical signals. The proposal is timely given rapid advances in edge AI, low-power sensing hardware, multimodal foundation models, and growing demand for robust perception in privacy-sensitive, low-visibility, or infrastructure-constrained environments. The impact on the EMC community is significant. It expands EMC from compatibility and interference mitigation toward enabling reliable, trustworthy multimodal sensing systems operating in complex electromagnetic environments. Beyond EMC, the session fosters cross-disciplinary collaboration spanning AI, robotics, security, human-computer interaction, and smart infrastructure, accelerating applications in public safety, healthcare, smart spaces, and next-generation human–machine interaction. |
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Weapon Detection in Public Sapces via Metasurface-based mmWave ImagingSihun Yang
Abstract The increasing incidence of armed violence, such as stabbings and active shootings, in crowded public spaces highlights an urgent need for widely deployable weapon detection systems. Detecting concealed weapons requires precise imaging, rather than simple metal detection, to distinguish weapons from everyday metallic items. However, existing imaging systems, such as airport body scanners, rely on costly hardware and require cooperative subjects to pause during the scanning process. Consequently, these systems are confined to controlled checkpoints with explicit queuing, hindering large-scale deployment.
In this talk, I will present a low-cost, walk-through weapon detection system utilizing a commodity mmWave radar paired with a passive metasurface. The core idea of our system is to employ a transmissive metasurface that spatially encodes the reflection map of the scene, enabling the reconstruction of the target image from limited mmWave measurements without requiring costly hardware or mechanical scanning. To translate these measurements into high-fidelity images, we incorporate a physics-informed diffusion model to generate target images consistent with the reflected mmWave signals, allowing the system to infer the concealed object’s shape and type. Preliminary simulation results suggest our system achieves a spatial resolution of up to several wavelengths, even for moving targets. Finally, this talk will detail remaining challenges, concluding with a discussion of future work for deployment in public spaces.
Sihun Yang is a Ph.D. student in Computer Science at KAIST, advised by Prof. Jun Han. His research interest lies at the intersection of wireless sensing and mobile/sensing systems. His work focuses on developing physics-informed sensing systems that extend commodity wireless platforms into robust machine perception, enabling pervasive sensing intelligence.
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Acoustic-based Activity RecognitionGyuyeon Kim
Monitoring everyday events in the home can help computational systems provide timely assistance without requiring constant user effort. However, existing solutions involve important trade-offs. Cameras introduce privacy concerns, and wearables depend on consistent use and regular charging. Tag-based approaches are often more practical, but many require periodic battery replacement, depend on non-ubiquitous transceivers, or need multiple receivers per room because of limited sensing range.
In this talk, I will present AcousTag, a batteryless, 3D-printed tag that can be sensed by widely deployed smart speakers such as Amazon Echo Dots to detect interactions with hinged or sliding objects from a distance. AcousTag includes two main technical contributions: (1) a batteryless tag design that harvests motion energy to produce unique, identifiable acoustic reflections, and (2) a receiver-side software system that retrofits commodity smart speakers to detect these reflections in real time, enabling room-scale sensing and differentiation of multiple object interactions. We evaluate AcousTag through real-world deployments across two homes, where it achieves an average activation accuracy of over 94%. We also show that tags can be detected at distances up to 11 m, while remaining robust during multi-speaker operation and simultaneous tag activations.
Gyuyeon Kim is a Ph.D. student in Computer Science at KAIST, advised by Prof. Jun Han. His research interest lies in cyber-physical systems, sensing intelligence, and mobile/IoT systems. His work focuses on building practical sensing systems that use commodity hardware and physics-informed methods to solve real-world problems. He has received an ACM HotMobile Best Poster Award.
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Vision-based Counterfeit Food Product DetectionJonghyuk Yun
The prevalence of counterfeit infant formulas poses serious threats to infant health and safety, a concern highlighted by the notorious Melamine Milk Scandal that affected hundreds of thousands of children. The primary challenge in detecting counterfeit formulas lies in their sophisticated adulteration and substitution techniques. Such detection is feasible only in laboratory settings, making it nearly impossible for average
consumers to test the formula before feeding their infants. In this talk, I will present PowDew, a novel and practical system that enables counterfeit infant formula detection using only a commodity smartphone. PowDew operates by capturing and analyzing the interaction of a water droplet with the powdered formula, focusing on the droplet motion, namely its spreading and penetration. Our key insight is that the droplet motions are governed by powder-specific properties such as wettability and porosity. PowDew analyzes the subtle differences in droplet motions and infers the formula’s authenticity. To demonstrate PowDew’s effectiveness, we implement PowDew and conduct comprehensive real-world experiments under varying conditions with different brands of powdered infant formula and adulterants. Our extensive real-world evaluation, comprising 12,000 minutes of video recordings across various brands of authentic and altered infant formulas under different conditions, demonstrates that PowDew achieves a detection accuracy of up to 96.1%.
Jonghyuk Yun is a Ph.D. student at the Sensing Intelligence and Cyber-Physical Security (CyPhy) Lab at KAIST, advised by Prof. Jun Han. His research focuses on the novel use of sensors in mobile environments to address challenges in public safety. In particular, he is interested in developing solutions for public safety by augmenting physics-based models and integrating diverse sensing modalities, with an emphasis on commodity mobile devices and real-world deployment. He has received multiple awards at top-tier mobile and sensing venues, including the Best Paper Award at ACM MobiSys, as well as the Best Poster Award at ACM SenSys and ACM HotMobile.
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| WS/TU ID | TU#1 |
| Session Organizer | Richard Hoad / QinetiQ Ltd. |
| Title | Resilience and Protection of Critical Infrastructure from HPEM Environments |
| Session Description | This tutorial will introduce or reappraise the audience with the need for and the potential solutions for HPEM resilience and protection of critical infrastructure assets. We will provide an overview of relevant transient HPEM ‘threat’ environments including High altitude Electromagnetic Pulse (HEMP) and Intentional Electromagnetic Interference (IEMI) environments. We will describe what critical infrastructure is and how it has particular challenges, which could make it vulnerable to HPEM environments. Finally, we will discuss some practical protection solutions and introduce the concept of moving towards a resilience based, rather than protection-dominated, approach to HPEM threat mitigation. We will reference published information such as the standards of International Electrotechnical Commission (IEC) 77C and, in particular, the newly published IEC standard 61000-5-6. We will also reference other relevant authoritative documents and provide a bibliography for further reading. |
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Resilience and Protection of Critical Infrastructure from HPEM EnvironmentsRichard Hoad
This tutorial will introduce or reappraise the audience with the need for and the potential solutions for HPEM resilience and protection of critical infrastructure assets. We will provide an overview of relevant transient HPEM ‘threat’ environments including High altitude Electromagnetic Pulse (HEMP) and Intentional Electromagnetic Interference (IEMI) environments. We will describe what critical infrastructure is and how it has particular challenges, which could make it vulnerable to HPEM environments. Finally, we will discuss some practical protection solutions and introduce the concept of moving towards a resilience based, rather than protection-dominated, approach to HPEM threat mitigation.
We will reference published information such as the standards of International Electrotechnical Commission (IEC) 77C and, in particular, the newly published IEC standard 61000-5-6. We will also reference other relevant authoritative documents and provide a bibliography for further reading
Richard is Chief Engineer for Directed Energy Weapons and Resilience (DEWR) at QinetiQ UK Ltd. Richard provides strategic oversight and leadership of QinetiQ’s DEWR Technical capability; where a capability is defined as people/skills, facilities & tools, Technology and partnerships.
He has undertaken many years of research studying emerging disruptive threats to military and Critical Infrastructure assets, particularly for high impact low likelihood events. He has helped operators of mission critical and essential services understand their risk to novel Electromagnetic threats and has developed tools, techniques and products which support improved resilience of military systems and the Critical Infrastructure. Richard is the author of over 90 peer reviewed technical and journal papers on the topics above and is co-author of a book titled ‘HPEM effects on electronic systems’. He is a Fellow of the Institute of Engineering and Technology (IET), registered with the Engineering Council UK (ECUK) as a Chartered Engineer (C.Eng.) a HPEM Fellow of the SUMMA foundation; a QinetiQ Senior Fellow; and a Member of the Register of Security Engineers and Specialists. In 2022 Richard received the prestigious Carl Baum Medal. |
| WS/TU ID | TU#2 |
| Session Organizer | D. V. Giri / Pro-Tech |
| Title | Overview of HPEM Sources, Antennas and Applications across Various Frequency Bands |
| Session Description | One way to classify HPEM Environments is based on the bandwidth. This classification has resulted in 4 bands. It is noted that, of all the HPEM environments, natural lightning signal is the only environment occurring in nature. The rest are all created by mankind. In this tutorial, we will describe examples of many existing HPEM sources across all bands along with appropriate radiating systems for each of these sources. One of the bands, called the hyperband has at least 2 decades of frequencies (ex: 40 MHz to 4000 MHz) and has both civilian and military applications which will also be presented. |
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Presentation Title Classification of HPEM Environments: Narrowband Sources and AntennasDr. D. V. Giri
We introduce the 4-band classification of HPEM signals and then launch into a description of Narrowband High-Power Microwave systems along with appropriate antennas. It is noted that GW level sources are possible in the L Band and several 100s of MW of pulsed microwaves can be produced with adverse effects on electronic systems, Typical sources are relativistic Magnetrons, Vircators and Reltrons. Operating principles of such sources will be described along with appropriate radiating systems. Methods to calculate near, intermediate and far fields will be presented. Many examples of such facilities and their capabilities will be described.
Dr. Giri has over 50 years of work experience in the general field of electromagnetic theory and its applications in NEMP (Nuclear Electromagnetic Pulse), HPM (High-Power Microwaves), Lightning, and UWB (Ultra-Wideband). A complete description of his academic training and work experience may be seen at his website: www.dvgiri.com
He obtained the B.Sc., Mysore University, India, (1964), B.E., M.E., Indian Institute of Science, (1967) (1969), M.S., Ph.D., Harvard University, (1973) (1975), Certificate, Harvard Introduction to Business Program, (1981). Since 1984, he is a self-employed consultant doing business as Pro-Tech, performing R&D work for U.S. Government and Industry. He is also an Adjunct Professor in the Dept. of ECE, University of New Mexico, Albuquerque, NM. Dr. Giri has taught graduate and undergraduate courses in the Dept. of EECS, University of California, Berkeley campus. LIFE FELLOW of IEEE, Books |
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Moderate Band HPEM Sources and AntennasD. V. Giri, Ph.D.
Moderate band of frequencies are defined by a percentage bandwidth (pbw) in the range of 1 to 100%. Damped sinusoidal sources meet this requirement. In this presentation, we will describe ways of generating damped sinusoidal waveforms and energize helical antennas.
Many such systems have been developed with center frequencies ranging from 100 MHz to 1 GHz. The radiated waveforms grow for a few cycles and then decay in a few cycles of sinusoids. Helical antennas have been integrated with such sources, producing a circularly polarized electromagnetic field at a distance. Antenna Analyses and experimental verification will also be presented.
Dr. Giri has over 50 years of work experience in the general field of electromagnetic theory and its applications in NEMP (Nuclear Electromagnetic Pulse), HPM (High-Power Microwaves), Lightning, and UWB (Ultra-Wideband). A complete description of his academic training and work experience may be seen at his website: www.dvgiri.com
He obtained the B.Sc., Mysore University, India, (1964), B.E., M.E., Indian Institute of Science, (1967) (1969), M.S., Ph.D., Harvard University, (1973) (1975), Certificate, Harvard Introduction to Business Program, (1981). Since 1984, he is a self-employed consultant doing business as Pro-Tech, performing R&D work for U.S. Government and Industry. He is also an Adjunct Professor in the Dept. of ECE, University of New Mexico, Albuquerque, NM. Dr. Giri has taught graduate and undergraduate courses in the Dept. of EECS, University of California, Berkeley campus. LIFE FELLOW of IEEE, Books |
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Ultra-Moderate and Hyper band HPEM Sources, Antennas and some Illustrated Applications.D. V. Giri, Ph.D.,
The maximum percentage bandwidth (pbw) of any electromagnetic signal is 200 %. Ultra-moderate band is defined by a pbw in the range of 100% to 163.64%. Hyperband occupies a percentage bandwidth in the range of 163.65 to 200%. In practice, we have achieved a pbw of nearly 192% out of a theoretical max of 200%. High-power sources in these two bands will be described. We will focus on hyperband sources and antennas in this presentation. After a description of design principles, we will address measurements and diagnostics. Pulsed antennas are a developing area of research, wherein very common terms such as gain and beamwidth are yet to be defined. The input pulse and the radiated transient fields have a very wide spectrum of frequencies and common antenna terms are defined for a single frequency of operation. One other important feature of these special antennas results in non-dispersive performance. We will also describe some military and civilian applications for such hyperband antennas.
Dr. Giri has over 50 years of work experience in the general field of electromagnetic theory and its applications in NEMP (Nuclear Electromagnetic Pulse), HPM (High-Power Microwaves), Lightning, and UWB (Ultra-Wideband). A complete description of his academic training and work experience may be seen at his website: www.dvgiri.com
He obtained the B.Sc., Mysore University, India, (1964), B.E., M.E., Indian Institute of Science, (1967) (1969), M.S., Ph.D., Harvard University, (1973) (1975), Certificate, Harvard Introduction to Business Program, (1981). Since 1984, he is a self-employed consultant doing business as Pro-Tech, performing R&D work for U.S. Government and Industry. He is also an Adjunct Professor in the Dept. of ECE, University of New Mexico, Albuquerque, NM. Dr. Giri has taught graduate and undergraduate courses in the Dept. of EECS, University of California, Berkeley campus. LIFE FELLOW of IEEE, Books |