Workshop Program

With the rapid rise and sophistication of AI, there is a growing anticipation for 6G as the essential communication and computing infrastructure of the future, fueling global R&D and demonstration experiments. Leading these efforts in Japan, the XG Mobile Promotion Forum (XGMF) collaborates with international 6G organizations to drive various projects aimed at boosting Japan's technological leadership and industrial growth.
This session spotlights the forum's initiatives specifically in 6G wireless technologies. Industry specialists will deliver detailed insights into the latest technical discussions, key challenges, and future roadmaps, focusing on critical topics including: 'AI and Digital Twins for Communication Systems,' 'Radio Propagation in New Frequency Bands,' 'Advanced Millimeter-Wave Utilization,' and 'Terminal Cooperative Transmission and Reception.

Keyword ： 6G, XG Mobile Promotion Consortium (XGMF), Radio Technology, Recent Research and Development Trend

Integrated Sensing and Communications (ISAC) has attracted significant attention in recent years as a key technology enabling the secondary utilization of radio spectrum. As the era of 5G-Advanced (5G-A) and 6G approaches, sensing technology is expected to play a central role in their technological advancement.
This session will outline the standardization efforts and technological trends in ISAC, followed by an introduction to empirical demonstrations using cellular signals as practical applications of ISAC technology.

Keyword ： Wireless Sensing, Integrated Sensing and Communications (ISAC), Standardization, Cellular

Terahertz waves are electromagnetic waves in the frequency range of 100GHz to 10THz, positioned between light waves and radio waves, and they possess a variety of distinctive characteristics. Terahertz sensing is expected to find broad applications, including high-resolution sensing of objects' interiors using the 100GHz band and object identification based on object-specific absorption spectra above 500GHz.
In this session, we will invite speakers conducting cutting-edge research on the diverse uses of terahertz technology-including tomography, bioimaging, and remote sensing from space-to present their latest research results.

Keyword ： Terahertz, Bio Imaging, Tomographic Imaging, Remote Sensing,

Realizing ultra-high-speed, high-capacity, and low-latency wireless access networks in the IOWN era requires the convergence of photonic and high-frequency wireless technologies.
This session focuses on key enabling technologies, including photonic-RF device technologies, area deployment technologies for high-frequency-band wireless systems using Analog Radio over Fiber (A-RoF), and optical-wireless integrated transmission technologies for beamforming. The session also introduces the TOWER LINK concept, a highly reliable communication infrastructure utilizing power transmission towers. From fundamental enabling technologies to future social infrastructure applications, recent advances and future prospects of optical-wireless convergence technologies supporting next-generation communication networks will be discussed.

Keyword ： Optical-Wireless Convergence, IOWN, All-Photonics Network (APN), Radio over Fiber (RoF), Beamforming, Millimeter-Wave, Highly Reliable Communication Infrastructure, TOWER LINK

In recent years, research and development for next-generation communications such as 5G-Advanced / 6G have been actively pursued. Among the key components, power amplifiers are one of the most important, and extensive studies have been conducted not only on output power and efficiency, but also on load-variation tolerance, implementation technologies, linearity, and related factors.
In this session, we will present talks on a mode-reconfigurable GaN power amplifier for enhanced VSWR resilience, a 7GHz GaN amplifier module using film laminating technology, linearization technique for FR3 GaAs HBT PA using vector-sum phase shifter, and the latest trends in digital pre-distortion technique for GaN power amplifiers.

Keyword ： Next-Generation Communications, 6G, GaN, GaAs, Linearity, Digital Predistortion (DPD)

Microwave power transfer (MPT) is expected to enable a wide range of applications, from low-power RF energy harvesting to high-power wireless power delivery, and to play an important role in future society. Achieving high overall system efficiency, however, requires continued advances in rectifying devices and rectifier circuit technologies. The technical requirements vary significantly depending on the power level, operating frequency, and system architecture.
This session will discuss the current status and challenges of MPT rectification technologies from device, circuit, and system perspectives, and explore future directions for their development.

Keyword ： Wireless Power Transfer, Rectifier, Diode, FET, Wide Bandgap, Millimeter-Wave

Practical application of quantum computers requires a larger number of Qubits. In future large-scale qubit control systems comprising such as 10,000 or even a million qubits, it is essential to suppress thermal effects and supply stable microwave signals. Furthermore, advances in simulation technology are crucial for the development of superior microwave devices.
This workshop will present the latest technologies and the future prospects of adiabatic superconducting microwave circuits, microwave signal stabilization, and device and circuit simulations for large-scale Qubit control.

Keyword ： Quantum Computer, Qubit Control, Superconducting Microwave Circuit, Microwave Signal Stabilization, Device and Circuit Simulation

With the increasing use of higher frequencies in wireless communications, sensing, and related applications, accurate characterization of electromagnetic material properties in the millimeter-wave and sub-terahertz bands is becoming increasingly important. In these frequency ranges, appropriate measurement methods are required for various materials and structures, including artificial structures such as metasurfaces.
This workshop provides an overview of the fundamentals and recent advances in millimeter-wave material characterization and measurement technologies, together with examples including material parameter measurements in the sub-terahertz band, characterization of electromagnetic wave absorbing structures by reflection measurements, and metasurface characterization using free-space methods. The current status and future prospects of these technologies will also be discussed.

Keyword ： Material Characterization, Material Parameter Measurement, Complex Permittivity, Conductivity, Millimeter Wave, Sub-Terahertz Wave, Metasurface

for microwave wideband filters, which are indispensable components of next-generation Ultra-Wideband (UWB) wireless communication systems supporting the emerging IoT and AI society, through a series of illustrative design examples.
Firstly, the limitations of applying conventional narrowband filter design theory to wideband filters are demonstrated through a specific example. Next, representative circuit configurations widely used in wideband bandpass filter design are introduced, and the theoretical design procedures are explained using practical examples. In addition, advanced design techniques are presented, including methods for improving skirt selectivity, introducing notch bands within a wide passband, and realizing dual-band characteristics.

Keyword ： Wideband Filters, Synthesis, Theoretical Design, Equivalent Circuits, Applications

Associate Professor Akira Ozawa of Yokohama National University, KEYCOM Corporation, and Dr. Takahiro Mori of AIST are participating in national quantum technology programs aimed at advancing the practical deployment and industrialization of quantum computers. Dr. Ozawa's research includes the development of optical frequency comb systems for the vacuum-ultraviolet wavelength region and their application to precision spectroscopy. His research aims to extend optical frequency metrology, which has so far been widely used primarily in the visible and infrared regions, into the vacuum-ultraviolet region. This new technology will enable precision spectroscopy of atoms and ions, as well as the development of next-generation optical clocks operating at very short wavelengths. KEYCOM Corporation is participating in a NEDO project on accelerating the industrialization of quantum computers. The company is developing high-performance microwave signal transmission systems that operate in ultra-low-temperature environments, enabling low-loss and low-heat-leak connections between superconducting qubits and room-temperature control electronics. Dr. Takahiro Mori of AIST leads research on large-scale silicon-based quantum computing, including silicon qubits, cryogenic CMOS control circuits, and quantum-classical interface technologies under national programs such as Q-LEAP and NEDO. His work focuses on overcoming key scalability challenges by reducing wiring complexity and power dissipation in cryogenic environments while enabling the integration of quantum devices and classical control electronics. Together, these efforts address complementary aspects of future quantum computing systems-quantum devices, control electronics, and cryogenic interconnect technologies-and contribute to the realization of large-scale, practical quantum computers.

Keyword ： Quantum Computing, Cryogenic CMOS, Quantum Control Electronics, Cryogenic Microwave Interconnects, Optical Frequency Combs, Precision Spectroscopy, Vacuum Ultraviolet Light Sources, Optical Frequency Metrology

To create new value in wireless systems, utilizing wireless technology in non-communication fields is attracting significant attention. Now that automotive millimeter-wave radars for collision avoidance have become widely adopted, there is growing expectation for advancements in the radar and sensing domains, aiming for further market creation as the next step.
This workshop will widely introduce cutting-edge initiatives currently under study, including technological evolution toward 6G, the latest applications and future use cases of millimeter-wave radars, and innovations in wireless signal processing technology that serve as the core supporting these developments. Through these insights, we will explore the future direction of radar and sensing advancements toward next-generation deployments.

Keyword ： Sensing, Radar, Millimeter Wave, 6G, Radar Applications, Signal Processing, Integrated Sensing and Communication, ISAC

The realization of millimeter-wave and sub-terahertz technologies for next-generation wireless communications, sensing, radar systems, and electromagnetic wave control applications requires high-performance substrate materials, advanced manufacturing technologies, and functional electromagnetic materials.
This session will present recent developments in low-loss fluoropolymer substrates, PTFE-based high-frequency substrate materials, and multilayer PCB solutions, as well as fabrication technologies for fine-line patterning and microvia formation. In addition, terahertz-band electromagnetic wave absorbers will be introduced as emerging solutions for electromagnetic wave management and interference mitigation. From the perspectives of materials, fabrication, packaging, and electromagnetic wave control, the session provides an overview of key enabling technologies supporting next-generation high-frequency devices and systems.

Keyword ： Millimeter-Wave and Sub-Terahertz Technologies, High-Frequency Substrate Materials, Low-Loss Dielectric Materials, Fine-Line and Microvia Fabrication Technologies, Electromagnetic Wave Absorbers

Recently, wireless communication is widely used. Antenna is one of the important components in wireless communication. However, it seems that beginners feel antenna development is difficult.
In this WE7B session, basic type of antennas and its characteristics are introduced. In addition, antenna design, measurement methods and propagation are explained.

Keyword ： Antenna, Propagation, Radiation Pattern, Directivity, Gain

In this presentation, building on the fundamental antenna theory and S-parameters covered in the previous session, we will demonstrate electromagnetic field simulations using the FDTD method. We will first provide an overview of the FDTD method for analyzing electromagnetic fields in the time domain, and then use dipole and patch antennas as examples to walk through the process from model creation to mesh configuration and running the analysis. Through 3D visualization of electromagnetic field behavior, we will deepen your intuitive understanding of operating principles, while also providing a clear explanation of the fundamentals of simulation-based design evaluation, including S11, Smith charts, and methods for evaluating radiation patterns.

Keyword ： Antennas, FDTD, S-Parameter, Smith Chart