WEDNESDAY, OCTOBER 15, 2025

Opening Ceremony

Chairs : Titipong Lertwiriyaprapa (KMUTNB), Danai Torrungrueng (KMUTNB), Atsushi Sanada (The Univ. of Osaka), Kenji Ito (Kanazawa Institute of Technology)

Plenary Session I

Chair : Titipong Lertwiriyaprapa (KMUTNB)

PL1-01	13:00	Title: Engineering Wireless Power Transfer Fields with MetaRadiator: From Nulls-Free Propagation to Localized Efficiency Hotspots Prof. Sarawuth Chaimool (Khon Kaen University, Thailand) Biography: Associate Professor Dr. Sarawuth Chaimool is a distinguished Thai electrical engineer holding B.Eng., M.Eng., and Ph.D. degrees in Electrical Engineering from King Mongkut’s University of Technology North Bangkok (KMUTNB). After serving as a Lecturer at KMUTNB (2004-2014) and Udon Thani Rajabhat University (2014-2016), he currently holds the position of Associate Professor at Khon Kaen University, Thailand. His research expertise is centered on pioneering fields including metamaterials and metasurfaces, Reconfigurable Intelligent Surfaces (RIS), wireless power transfer, LoRaWAN communications, and wireless embedded systems. Dr. Chaimool is a highly prolific author, with approximately 150 publications, several book chapters, and two academic books to his name, including "Antenna Engineering" and "Electromagnetic Engineering." Known by his alias "MetaRadiator," he actively disseminates knowledge and contributes to engineering education through his YouTube channel (Jaounarak) and dedicated website (Metaradiator), extending his influence beyond academia. His professional recognition is further marked by his IEEE Senior Member status (SM'17). Abstract: Wireless Power Transfer (WPT) is poised to revolutionize how we interact with electronics, yet it remains hindered by two fundamental challenges: unreliable power delivery for mobile devices due to signal “nulls,” and poor efficiency in compact systems due to unfocused energy. We will journey from creating robust “power highways”—null-free waveguides that guarantee continuous energy flow for dynamic and batteryless systems—to designing intense “power hotspots” using engineered metasurfaces that focus energy with meticulous control. First, we will demonstrate how alternately coupled magneto-inductive waveguides completely eliminate power nulls, creating seamless "power highways" for robust, two-way dynamic charging. Then, we will shift focus to show how defected and planar metasurfaces can create highly localized efficiency hotspots, dramatically boosting power transfer efficiency for static applications. By presenting a unified strategy—from system-level architecture to component-level optimization—this presentation offers a comprehensive blueprint for the next generation of reliable and efficient WPT systems. Join this session to see how we can move beyond the limitations of today's WPT and unlock its full potential.
PL1-02	13:40	Title: Japan's Quantum National Strategy and Ecosystem Creation Dr. Masahiro Horibe (AIST, Japan) Biography: Masahiro Horibe received his Ph.D. in quantum engineering from the Nagoya University, Japan, in 2001. He received a Postdoctoral Fellowship from the Japan Society for the Promotion of Science during 1999 - 2001. In 2001, he joined Fujitsu Limited in Kanagawa, Japan. From 2001 to 2003, he worked in the Superconductivity Research Laboratory, International Superconductivity Technology Center, in Tokyo, Japan. In 2003, he started working on carbon-nanotube applications for integrated circuits in Fujitsu Laboratories Ltd., in Kanagawa, Japan. He is currently with the National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan, where he is a Group Leader of Electromagnetic Measurement Research Group and involves in high-frequency precision-measurement activities and measurement applications. He was a director of R&D coordination, METI, from 2021 to 2023, and planning officer, CSTI, CAO, from 2022 to 2023. He is now deputy director of global research and development center for business by quantum-AI technology (G-QuAT) in AIST. Abstract: G-QuAT will be installed at AIST in July 2023, covering a wide range of research areas, devices, systems, measurements, computational platforms, and applications The G-QuAT site will house three types of quantum computers (optical, neutral atom, and superconducting) and a GPU-HPC, All computing systems will be connected. These computational resources are provided for use case creation activities. In addition, G-QuAT will accelerate the development of next-generation quantum computers by supporting quantum computer vendors and suppliers. optical devices are key to the realization of FTQC photonic quantum computers. We are currently starting collaborative research with many parties in Japan, the U.S., and Europe. In this presentation, the basic infrastructure and activities of G-QuAT will be introduced.

SDC1: Warming-up (Ice-breaking & Intro Hands-on)

Speaker : Takayuki Matsumuro (ATR)

SDC2: Tutorial Session

Speaker : Takayuki Matsumuro (ATR)

SDC3: Hands-on (Design, Implementation & Measurement)

Speaker : Takayuki Matsumuro (ATR)

Welcome reception

THURSDAY, OCTOBER 16, 2025

TH1: Technical Session I - Passive Components & Others

Chair : Shuhei Amakawa, Hiroshima Univ.

TH2: Technical Session II - Wireless Power Transfer

Chair : Yasunori Suzuki, Okayama Pref. Univ.

TH3: Technical Session III - Antennas & Measurements

Chair : Ekasit Nugoolcharoenlap, RMUTR

YE1: Young Engineers Session I (3 min. Short Presentation: Part 1)

Chair : Kyoya Takano (Tokyo Univ. of Science)

YE2: Young Engineers Session II (3 min. Short Presentation: Part 2)

Chair : Kyoya Takano (Tokyo Univ. of Science)

FRIDAY, OCTOBER 17, 2025

YE3: Young Engineers Session III (Poster Presentation)

Chairs : Kyoya Takano (Tokyo Univ. of Science), Yasunori Suzuki (Okayama Pref. Univ.)

Plenary Session II

Chair : Danai Torrungrueng (KMUTNB)

PL2-01	13:00	Title: From Connectivity to Capacity: Enhancing Spreading Factor Allocation in LoRaWAN for Massive IoT Prof. Rardchawadee Silapunt (King Mongkut's University of Technology Thonburi, Thailand) Biography: Rardchawadee Silapunt received the B.E. degree in electrical engineering from Chulalongkorn University, Thailand, in 1996, and the M.S. and Ph.D. degrees in electrical and computer engineering from the University of Wisconsin-Madison, USA, in 1998 and 2004, respectively. In 2004, she joined the Department of Electronic and Telecommunication Engineering, King Mongkut’s University of Technology Thonburi, Thailand, as a Lecturer. She has published her research in more than 100 journals and conference papers. She is the vice chair of the Electromagnetics Area under Electrical Engineering/Electronics, Computer, Telecommunications, and Information Technology Association, Thailand and a consultant to the Thai IoT Association. Since the beginning of her career, she has received several research grants from government funding agencies and private sectors. Her current research interests include Artificial Intelligence of Things (AIoT), next generation wireless network, and vehicle-to-everything. Abstract: The Adaptive Data Rate (ADR) scheme in LoRaWAN plays a central role in assigning spreading factors (SFs), which directly influence data rate, coverage, and time on air. Nevertheless, ADR frequently suKers from the problem of SF clustering in dense network environments, where a large number of devices are assigned the same SF, leading to increased packet collisions and reduced eKiciency. This limitation constrains the scalability of LoRaWAN in massive IoT scenarios and motivates the exploration of alternative allocation strategies to improve reliability and network performance. This study investigates several algorithms for SF assignment, including Quantile Classification of Variance from the Mean (QCVM), Standard Deviation (SD), Utilized-Weight, and Geometric Distribution. These approaches classify or probabilistically distribute devices based on Received Signal Strength Indicator (RSSI) values and traKic characteristics to mitigate clustering and balance network load. Simulations were conducted under variations in node density, coverage distance, and payload size, with test samples derived from actual farm locations and herd sizes in Ratchaburi province, Thailand. The results demonstrate that the proposed algorithms consistently improve the Data Extraction Rate (DER) compared to the standard ADR scheme, underscoring their potential for enhancing LoRaWAN eKiciency in large-scale IoT applications such as smart livestock monitoring.
PL2-02	13:40	Title: Progress in Research & Development for WPT Systems Prof. Toshio Ishizaki (Ryukoku University, Japan) Biography: Toshio Ishizaki was born in Kagawa, Japan, on May 24, 1958. He received his B.E., M.E., and Doctor of Engineering degrees from Kyoto University, Kyoto, Japan, in 1981, 1983, and 1998, respectively. In 1983, he joined Panasonic Corporation (former Matsushita Electric Industrial Company Ltd.), Osaka, Japan, where he researched and developed microwave circuitry and components, especially microwave dielectric filters and power amplifiers for cellular radio communications. From 2004 to 2007, he worked for Matsushita Electronic Components Company Ltd., an affiliated company, as a director of the R&D laboratory. In 2010, he became a professor at Ryukoku University, and this is his current title. He received the 1998 OHM Technology Award from the Promotion Foundation for Electrical Science and Engineering in Japan, the 2003 Best Paper Award from IEEJ in Japan, the 2014 Best Paper Award from IEICE in Japan, the 1906 Award from IEC in 2021, and the APMC 2022 Prize. His research interests include wireless power transfer systems, microwave filters, microwave power amplifiers, and millimeter-wave systems. Dr. Ishizaki is a life senior member of IEEE and a fellow member of IEICE. He was the chair of the IEEE MTT-S Kansai Chapter from 2014 to 2016, and the chair of the IEICE Technical Committee on Wireless Power Transfer from 2020 to 2021. He also served as the TPC chair of IMWS-IWPT2012, and the steering committee chair of APMC 2018. Abstract: I will explain the progress on three themes related to the wireless power transfer system I have been researching and developing recently: “the 3D Free-Access WPT System”, “the Mobile WPT System”, and “the Millimeter-Wave Power Transfer System”. The 3D free-access WPT system enables wireless charging for mobile devices such as smartphones in a room without requiring conscious attention. The mobile WPT system is a system that wirelessly supplies power from laid transmission lines to electric vehicles as they drive on the road. The millimeter-wave power transfer system transmits information and energy using radio waves, with terminal devices receiving the energy to send information back, which is designed to build battery-free sensor networks essential for IoT. The achievement of these technologies is highly anticipated by society, and steady technical innovation continues toward practical realization. Therefore, I report on the recent progress.

Award Ceremony

Chairs : Suramate Chalermwisutkul (KMUTNB), Kensuke Okubo (Okayama Pref. Univ.), Kenjiro Nishikawa (Kagoshima Univ.)

Closing Session

Chairs : Chuwong Phongcharoenpanich (KMITL), Mamiko Inamori (Tokai Univ.)