SC1-R1

Principles of 5G Cellular Front-End Modules and Transition to 6G-FR3

Room

401

Time

9:30 - 12:30

Chair

Florinel Balteanu, Skyworks Solutions, USA

Organizer

Florinel Balteanu, Skyworks Solutions, USA

Abstract

The rapid evolution of wireless communication has placed unprecedented demands on the design and integration of radio-frequency front-end modules (FEMs) in modern cellular systems. This short course provides a comprehensive introduction to the principles governing 5G FEM architectures for cellular applications, covering the operation and co-design of power amplifiers, low-noise amplifiers, filters, switches, tuners, and antenna interfaces within increasingly complex multi-band, multi-mode, and massive-MIMO environments. Building on this foundation, the course examines the emerging transition to 6G and the FR3 spectrum (7-24 GHz), where new propagation characteristics, expanded channel allocations, hybrid beamforming, and advanced semiconductor technologies are reshaping front-end design strategies.

Lecturer

Florinel Balteanu, Skyworks Solutions, USA

Course Syllabus

• 1) 5G/5G+/NTN/6G Deployment
• 2) 5G/5G+/FR3 RF Front-end Module integration in mobile application
• 3) Acoustic filters, RF Switches and Antenna Tuners 5G/5G+
• 4) 6G-FR3 Challenges
• 5) Efficiency methods for 5G/6G-FR3 Power Amplifiers in mobile applications
• a. Envelope Tracking
• b. Digital Predistortion (DPD)
• 6) 5G and 6G/FR3 Power Amplifiers for Cellular Applications
• 7) References
• 8) Conclusions and Discussions

Objectives and Outcomes

A short course on “Principles of 5G Cellular Front-End Modules and Transition to 6G-FR3” provides engineers, researchers, and advanced students with a focused yet comprehensive exploration of how today's 5G cellular radio-frequency front-end modules are conceived, designed, and integrated. It explains the underlying device-level and system-level principles that shape modern 5G hardware—covering power amplifiers, filters, switches, antenna interfaces, and multi-band/multi-mode architectures—while also examining how these principles must evolve to meet the emerging challenges of 6G. This short course covers practical aspects of RF front-end integration in actual 5G/5G+ smartphones.

SC1-R2

Reconfigurable Intelligent Surfaces and Wavefront-Engineered Wireless Systems for 6G and B6G: From Electromagnetic Devices to Multishape Radio Communications

Room

402

Time

9:30 - 12:00

Chair

Doohwan Lee, NTT, Inc.

Organizer

Doohwan Lee, NTT, Inc.

Abstract

Future sixth-generation and beyond (6G and B6G) wireless systems will operate in millimeter-wave and sub-terahertz frequency bands to support extremely high data rates, ultra-low latency, and dense connectivity. However, at these frequencies conventional far-field beamforming becomes fundamentally limited due to severe path loss, beam divergence, blockage sensitivity, and alignment constraints. Consequently, next-generation wireless communications require not only higher carrier frequencies but also new methods for controlling electromagnetic wave propagation itself.

Recent progress in microwave and electromagnetic device technologies has demonstrated that engineered surfaces can actively control propagation environments. Reconfigurable intelligent surfaces (RIS) and metasurface-based structures enable programmable manipulation of phase, amplitude, and polarization of incident electromagnetic waves at millimeter-wave and sub-terahertz bands. Such devices allow near-field focusing, controllable reflection and transmission, and spatially engineered electromagnetic responses that cannot be achieved using conventional antenna systems. These technologies provide the physical hardware foundation necessary to realize advanced propagation modes in high-frequency wireless communications. Building upon this capability, wireless systems can exploit structured electromagnetic wavefronts rather than conventional plane-wave propagation. The multishape radio concept utilizes physical properties of electromagnetic waves to enhance communication performance beyond traditional beamforming techniques. In particular, orbital angular momentum (OAM) beams enable spatial multiplexing using orthogonal phase modes, Bessel beams provide non-diffracting and self-healing transmission, and Airy beams allow curved main-lobe propagation and interference-robust links. Experimental sub-terahertz systems have demonstrated high-capacity multiplexed transmission, improved coverage through self-healing propagation, and multi-stream communication using these wavefronts.

This short course presents a unified framework connecting RIS and metasurface device technologies with multishape radio wireless communication systems. The course explains how programmable electromagnetic surfaces enable structured wave generation and how these wavefronts can be practically generated, measured, and utilized in deployable wireless transmission systems. By bridging microwave device engineering and communication system realization, the course provides participants with a comprehensive understanding of wavefront-engineered communications for future 6G and B6G networks.

Lecturer

Mr. Daisuke Kitayama, NTT, Inc.

Dr. Adam Pander, NTT, Inc.

Dr. Doohwan Lee, NTT, Inc.

Mr. Yasunori Yagi, NTT, Inc.

Lecture Title

Part 1. Reconfigurable Intelligent Surfaces – From Device Physics to Dynamic Propagation Control

Part 2. Multilayer Metasurface Technology for Beamforming and Beam Shaping in 300-GHz Band Wireless Communication

Part 3. Multishape Radio Concept and Orbital Angular Momentum Beams for High-Capacity Wireless Systems

Part 4. Airy Beams and Bessel Beams – Curved Propagation and Self-Healing Transmission for Interference-Robust Wireless Links

Course Syllabus

• Part 1. Reconfigurable Intelligent Surfaces – From Device Physics to Dynamic Propagation Control [Mr. Daisuke Kitayama]
• Introduction to RIS and Metasurface Technologies for 6G
• Liquid Crystal-Based Transmissive Metasurface Design
• Experimental Demonstration of Dynamic Beamforming at 115 GHz
• Part 2. Multilayer Metasurface Technology for Beamforming and Beam Shaping in 300-GHz Band Wireless Communication [Dr. Adam Pander]
• Design Principles of Multilayer Transmissive Metasurfaces
• Beamforming Device Fabrication and Characterization
• Experimental Results and Implications for 6G Systems
• Part 3. Multishape Radio Concept and Orbital Angular Momentum Beams for High-Capacity Wireless Systems [Dr. Doohwan Lee]
• Introduction to Multishape Radio
• Fundamentals of Orbital Angular Momentum Beams
• High-Capacity OAM Multiplexing: Experimental Demonstrations
• Part 4. Airy Beams and Bessel Beams – Curved Propagation and Self-Healing Transmission for Interference-Robust Wireless Links [Mr. Yasunori Yagi]
• Fundamentals of Airy Beams
• Low-Interference Multi-Stream Transmission Using Airy Beams
• Bessel Beams: Non-Diffracting Transmission for Rx SNR Enhancement

SC2-R1

Microwave Theranostic Systems: From Microwave Imaging to Non-Invasive Ablation and Treatment Monitoring

Room

401

Time

14:00 - 17:00

Chair

Prof. Yoshihiko Kuwahara (Aichi Medical University)

Organizer

Yoshihiko Kuwahara, Aichi Medical University, Japan
Kimihito Fujii, Aichi Medical University, Japan

Abstract

Microwave technology is expected to play an increasingly important role in cancer diagnosis and therapy. In particular, microwave imaging has emerged as a promising modality for breast cancer detection because it utilizes the dielectric contrast between malignant and normal tissues without ionizing radiation. More recently, microwave beamforming has also been investigated for non-invasive thermal ablation, enabling both diagnosis and treatment within a common antenna array.

This short course introduces the principles and practical implementation of microwave theranostic systems for breast cancer. The course first reviews the electrical properties of breast tissues and the fundamentals of inverse scattering techniques, including BIM and DBIM. It then discusses the design of clinical microwave imaging systems, calibration methods, and clinical imaging results. The latter part focuses on non-invasive microwave ablation using beamforming techniques and recent advances in treatment monitoring based on microwave measurements, including S-parameter analysis and radar imaging.

Numerical simulations, prototype systems, and clinical imaging studies will be presented to provide participants with a comprehensive overview of current technologies, practical implementation issues, and future research directions toward integrated microwave diagnosis, treatment, and monitoring.

Lecturer

1. Yoshihiko Kuwahara – Professor emeritus, Shizuoka University; Visiting Professor, Aichi Medical University

2. Kimihito Fujii – Professor, Aichi Medical University

Lecture Title

1. Clinical Background of Breast Cancer Diagnosis and Treatment

2. Microwave Theranostic Systems: Imaging, Non-Invasive Ablation, and Treatment Monitoring

Course Syllabus

• 1. Introduction to microwave applications in medicine
• 2. Clinical background of breast cancer diagnosis and treatment
• 3. Electrical properties of breast tissue / Fundamentals of inverse scattering techniques
• Forward scattering
• Ill-posed inverse problems
• Regularization techniques
• BIM and DBIM
• 4. Design of clinical microwave imaging systems
• Hardware configuration
• Image reconstruction
• Calibration
• Clinical implementation
• 5. Clinical microwave imaging
• Imaging procedures
• Clinical examples
• Diagnostic performance
• 6. Non-invasive microwave ablation therapy
• Beamforming techniques
• Ablation theory
• Numerical simulations
• Antenna array design
• 7. Microwave ablation monitoring
• Current research trends
• DBIM-based monitoring
• S-parameter monitoring
• Radar imaging
• 8. Future perspectives for integrated microwave theranostic systems

Objectives and Outcomes

After completing this course, participants will be able to:

• Understand the dielectric properties of breast tissues and their significance in microwave diagnosis and therapy.
• Explain the principles of inverse scattering techniques, including BIM and DBIM.
• Understand the design and implementation of clinical microwave imaging systems.
• Describe the principles of non-invasive microwave ablation using beamforming techniques.
• Understand current technologies and challenges in microwave ablation monitoring.
• Identify future research directions for integrated microwave theranostic systems combining diagnosis, treatment, and treatment monitoring.

SC2-R2

Microwave Filter Design: From Fundamentals to Cutting-Edge Techniques

Room

402

Time

14:00 - 17:00

Chair

Prof. Zhewang Ma (Saitama University, Japan)

Organizer

Masataka Ohira, Doshisha University
Sungtek Kahng, Incheon National University

Abstract

The design of microwave filters has evolved from classical synthesis techniques to modern coupling matrix synthesis in order to meet the high-performance demands of modern wireless communication. This short course covers: (I) the fundamental concepts of microwave filter design; (II) modern filter design techniques based on the coupling matrix; and (III) advanced wideband filter design techniques. Attendees will gain a deep understanding that bridges the gap between classical theory and modern design tools, equipping them to apply theoretical knowledge effectively in practical design.

Lecturer

(I) Sungtek Kahng, Incheon National University

(II) Masataka Ohira, Doshisha University

(III) Chun-Ping Chen, Kanagawa University

Lecture Title

(I) Fundamentals of Microwave Filter Design

(II) Coupling-Matrix Based Microwave Filter Design

(III) Advanced Wideband Filter Design Techniques

Course Syllabus

• (I) Fundamentals of microwave filter design
• Lowpass filter prototype
• Frequency and impedance transformations
• Microwave distributed-element filters
• (II) Coupling-matrix based microwave filter design
• Generalized Chebyshev function
• Coupling matrix synthesis and extraction
• Filter designs (microstrip and SIW)
• (III) Advanced wideband filter design techniques
• Problems in the design of wideband filters using conventional filter synthesis theory
• Synthesis/design methods for wideband filters and related considerations
• Practical design of wideband filters

Objectives and Outcomes

Learning Objectives:

The primary goal is to provide a unified framework for designing microwave filters. Attendees will:

• Learn the fundamentals of microwave filter design.
• Master the coupling matrix as a powerful tool.
• Acquire design techniques for wideband filters.