Workshop Program

Radio frequency plays an important role in the daily lives and social and economic activities of the people. In anticipation of the full-fledged 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)

The wireless industry has successfully grown up through two gigantic business markets: broadcasting since 20th and telecommunication since 21st century. To follow them as the third arrow, rapidly emerging is the wireless power transfer (WPT). Four technical sessions are assigned to WPT in this MWE event.
The keynote lecture views WPT fundamentals, design theory, and practical implementations especially focussing on capacitive-coupling schemes.

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

The 5th 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 second 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

We have not seen too many practical application of WPT so far 10 years after it became a significant discussion topic. It would be necessary to be more strongly conscious of power transfer, not signal transmission, and to get over the scope of familiar microwave technology. Having those concerns in mind, we would like to think over the WPT together with power electronics engineers.

Keyword ： High frequency inverter, GaN-FET, Electromagnetic coupling, Wireless power transfer, Contactless power transfer, Periodic circuit, Receiver, ATAC

As for the microwave materials, there are some restrictions to the magnetic materials in comparison with the dielectric materials and the air. This is because magnetic permeability is provided only from ferromagnetic or ferrimagnetic materials and most of the magnetic materials are metallic. However, some novel materials and their applications have been developed to solve the subjects and have attracted an attention, recently. On the other hand, there is an aspect that magnetic materials and their applications for the microwave are of less practical use at present because relatively little is known about them.
Here, the members of  Investigating R&D Committee on Practical Applications of High-Frequency Magnetic Materials, IEEJ" will introduce the cutting edge of magnetic materials and their applications for microwave to researchers and engineers of the microwave.

Keyword ： Magnetic materials, 5th generation mobile communications system, Complex permeability measurement, Magnetostriction, Copper loss, Skin effect, Noise suppression, Electromagnetic compatibility

The elimination of electric power consumption has been strongly required for 4G/5G mobile communication systems. The challenges of the efficiency improvement of the PAs in the backed off power level have become more important to meet the requirement for higher spectrum efficiency, while class-F operation and Doherty configuration have widely used in the current PAs.
This workshop covers the backed-off efficiency boosting techniques of the recent base station PAs.

Keyword ： Power Amplifier, GaN, Wide Band, High-Efficiency, Class-F, Inverse Class-F, Back-Off, Doherty, Envelope Tracking

Electronic measurement instruments are becoming so smart that users do not understand how the data is processed inside. Users often tend to believe the data displayed on a measurement instrument is accurate. Yes, measurement instruments are accurate but it is just accurately measuring what is connected to the front panel. You may be either so impressed or overwhelmed by many fancy functions that you feel what you are doing is a highly sophisticated measurement. However, the highly sophisticated data processing would just result in a set of useless data if the way you connect your device is not appropriate.
Vector Network Analyzers will be the example of the "smart" instruments in this seminar and you will find an insight and a hint to make your measurements accurate.

Keyword ： S-parameter, Vector Network Analyzer, Measurement, Calibration

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