Workshop Program

Radio frequency plays an important role in the daily lives and social and economic activities of the people. In anticipation of the fullfledged IoT/AI/big data era, it is important that to note that while the use of radio frequency in various fields is progressing, it is necessary to achieve an advanced wireless communication network that can provide appropriate communication speed, flexibility and reliability according to the usage situation.
For this reason, the Ministry of Internal Affairs and Communications promotes research and development of new wireless communication systems such as 5G, IoT and others that contribute to the effective use of radio frequency, efforts to secure the frequencies necessary for creating new innovation and examination for radio system reform.
In this presentation, we will introduce the latest radio frequency administration.

→ * You can read the trial of digest (PDF)

A microwave power transfer (MPT) technology, which is a far-field wireless power transfer (WPT) technology via microwaves, has a long history of research and development (R&D). However, commercialization and discussion toward new radio wave regulation have just started in recent a few years.
In this talk, I introduce recent R&D and the commercialization of the MPT not only in Japan but also in the world, and discuss the future of the MPT as novel application of radio waves.

→ * You can read the trial of digest (PDF)

The 5^th generation mobile communication system 5G is a next generation mobile communication system having features such as "ultra-high speed/large capacity", "large number of connections", "ultra-low latency" etc., which further developed the existing system. It is expected that 5G will be realized as an ICT base of the advanced information society at an early stage. In recent years, in Japan, activities related to research and development and international standardization of technologies and functions supporting 5G, such as radio access network technologies and others, are rapidly accelerating toward the actualization of 5G in 2020. From fiscal year 2017, the Ministry of Internal Affairs and Communications (MIC) "5G system trials" has been started, and many stakeholders in various utilization fields participate in the trials as well as those related to the mobile communications industry to create a new market through actualization of 5G.
In this session, regarding 5G system trials in the third year of this fiscal year, following the introduction of the overview of the trials by the MIC, each domestic mobile communication operator promoting the system trial will introduce the content and plan of each trial.

Keyword ： 5G, Mobile Communication, System Trial, Various Use Cases

Recent advances in wireless power transmission, energy harvesting, and RFID are rapidly increasing the need for high-efficiency rectifiers and high-efficiency rectennas.
In this session, we will focus on device technology, circuit technology, and system technology to realize high-efficiency microwave/RF rectifiers with diodes or transistors operating from ultra-low power levels to high power levels. The latest topics in this field are presented from basic theory to practical technology, and the nature of technology is pursued and global benchmark performance is grasped.

Keyword ： Diode Rectifier, Transistor Rectifier, High-efficiency Rectenna, Energy Harvesting, Wireless Power Transfer, Microwave

5G service has already started in the United States and Korea from April 2019. It will also start soon in Japan. 5G, which innovates communication performances in comparison with 4G, forces high performances to microwave and millimeter-wave amplifiers owing to the operation frequency increase, bandwidth increase, etc. On the other hand, a next-step research named "Beyond 5G" has already started.
In this session, developed power amplifiers for mobile handset and basestation applications are introduced. They will be applied to practical 5G systems. In addition, a practical design technique of an outphasing power amplifier that is expected to match a recent digital modulation technique is also introduced based on an evaluation result.

Keyword ： 5G, Beyond 5G, Power Amplifier, Microwave/Millimeterwave, Envelope-tracking Amplifier, Doherty Amplifier, Outphasing Amplifier

At 5G, where services have been launched all over the world, radio waves of 28GHz and 39GHz are used, and in 6G, where research and development are beginning, the use of frequencies above 100GHz is being considered. In addition, millimeter wave use in millimeter wave automotive radar has been advanced for automatic driving. The millimeter wave band has a frequency of about 10 times or more of 2 to 3GHz used in the current 4G-LTE, so evaluation of conductivity in the millimeter wave band can be made in addition to the permittivity of the circuit board material. It will be necessary.

Keyword ： Dielectric Permittivity Measurement, Electronics, Millimeterwave, 5G/6G, Conductivity, Substrate

MIMO techniques employing multiple antennas at both the transmitter and receiver sides can increase transmission speed by spatially multiplexing signals, and are essential for the fifth generation mobile communication system.
This workshop introduces fundamentals of MIMO techniques using multipath signals and their applications.

Keyword ： Spatial Filtering, Spatial Multiplexing, Multipath, Channel Capacity, Channel Information, Interference

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