Workshop Program

Microwave power amplifiers are fundamental components of electronics, such as communication systems, radar systems, and power electronics including wireless power transfer systems.
In this course, the specific structure common to such power amplifiers will be explained back to the origin by both device and circuit viewpoints, and the challenges to be faced and solutions to those will be presented. The operation of the power amplifier is analyzed both as the small signal operating state based on the theoretically established linear circuit theory, and is analyzed as the large signal nonlinear operating state. Basically the power gain and stability is improved with the linear circuit theory and the power efficiency and distortion characteristics are improved by means of controlling voltage-current nonlinear waveforms of the transistor. Theoretical and experimental handling methods for these power amplifiers using GaN HEMT's will be explained for beginners. As examples, the load circuit design method considering the fundamental and harmonic frequencies aiming at 100% power efficiency and the broadband and concurrent design method of high efficiency power amplifiers will be explained. The time reversal duality between power amplifier and rectifier will be shown so as to understand the similarity between amplifier design and rectifier design.

Keyword ： Power Amplifier, Matching Circuit, Operation Class, Gain, Efficiency

Social infrastructure systems will also drastically change in future mobility. Dynamic map technology is indispensable to mitigate traffic jams and realize autonomous driving support systems (ADAS). Driving in extreme weather, the final challenge for ADAS, will be solved by radio maker. Laser sensors will enable us to recognize running cars from roadside equipment.
In this workshop, such technologies needed for infrastructure systems for future mobility will be introduced.

Keyword ： Autonomous Driving Assistance System, Social Infrastructure, Dynamic Map, Radio Maker, Laser Sensor

Style of cars are drastically changing. Autonomous driving relives human from driving tasks. Traditional gasoline engines are replaced with electric motors, even without batteries. Wire harness will be extinct from engine room to make car structure simple. Inter-vehicle communication allows exchanging information between running cars.
In this workshop, technologies which enable such future car will be introduced.

Keyword ： Autonomous Driving Assistance System, Non-contact Power Transfer, Propagation Analysis, Inter-vehicle Communications

The R&D interests are shifting from the 5G wireless system / base stations to the 5G terminals and the Beyond （5G+） base stations.
This session focuses on the recent CMOS/GaN PA technologies for the 5G and the beyond 5G base stations / terminals including high SHF-band.

Keyword ： 5G, High Power Amplifiers, Transmitter, CMOS, GaN, Doherty Amplifiers, Mobile Terminal, Base Station

"Antennas and Propagation" are necessary and indispensable fundamental technologies for wireless communications systems. And, the wireless system is a crucible of needs in "Antennas and Propagation" research.
In this basic lecture, the minimum basic knowledge to understand "Antennas and Propagation" is explained easily. The role of "Antenna and Propagation" research achieved in realization of wireless communication systems is clarified, and the history of practical antennas for these systems is gathered concisely. More, the change and trend of "Antennas and Propagation" research are remarked.

Keyword ： Antennas and Propagation, Wireless Communication Systems, Mobile Communication, Satellite Communication, Electromagnetic Field Analysis

Various useful small antennas for multi-function cellular terminals and wireless LAN have been researched and developed. However, more advanced ideas and technical challenges in small antennas will be required to realize comfortable IoT world.
This session provides the fundamental knowledge of small antenna theory such as Q limit and presents successful results which applied multi-mode excitation or split-ring resonator elements. Moreover, in body-mounted small antenna is discussed as one of the future challenges in this subjected.

Keyword ： Small Antenna Theory, Q Limit, Multi-Mode Excitation Antenna, Split-Ring Resonator Antenna, in Body -Mounted Antenna

This session focuses on the latest RF energy harvesting technology and wireless power transfer technologies and theory.
In the first part, the R&D trend of the RF energy harvesting technologies for IoT devices and the high efficiency energy harvesting system by using high impedance antennas. In the second part, the wireless power transfer technology with waveguide and zero herts kQ theory.

Keyword ： Wireless Power Transfer, RF Energy Harvesting, Rectifier, Rectenna, Microwave Circuit

Recently, various wireless power transfer (WPT) technologies are commercialized. In the various WPT, a microwave power transfer (MPT) technology is getting a lot of attention as a new WPT technology. The MPT is a long distance WPT and an unconscious wireless charger. Toward the commercialization of the MPT, not only novel antenna technologies and novel devise technologies but also killer applications are required.
In this work shop session, novel researches and developments of the MPT and novel MPT applications will be introduced and novel future MPT technologies will be overlooked.

Keyword ： Microwave Power Transfer, GaN, Amplifier, Rectenna, Millimeter Wave, Beam Forming, Stratosphere Radio Relay System

Recently, utilization of IoT technology has been improving productivity in the manufacturing field. From now on, wireless technology is promising for collecting/delivering information from/to systems for sensors, RF-ID tags, monitoring equipment and so on. However, there is a risk that data arriving in necessary time is not guaranteed where various wireless systems coexist in severe wireless environment of a factory.
In this workshop, political and technical efforts to address the issues and to promote wireless technology utilization in the manufacturing field are discussed.

Keyword ： IoT, Wireless System, Factory, Manufacturing Field, Radio Propagation, Coordination among Systems, Sensing

Recently some communication technology by using 60 GHz millimeterwave has been emerged. IEEE802.15.3e "High-Rate Close Proximity Point-to-Point Communications" is based on new features which are link setup time 2ms, 100 Gbps by MIMO and etc. This standardization work had been finalized.
The process of IEEE802.15.3e's standardization, the standard's specification, one of PHY methods, measurement technology and system for 60 GHz will be presented.

Keyword ： Millimeter Wave, High Rate, Close Proximity, Point to Point, IEEE802.15.3.e

The aim of these extreme introductory courses is to drive "too basic to ask" questions through the radical discussion. When designing and assembling circuits, we should give various attention to which is not listed in circuit diagrams. Therefore, it is necessary that an engineer understand assembly.
In this session, basic skills and methods on microwave circuit measurements are introduced. A few points to be noted on of the measurements are also discussed from a viewpoint of theoretical and practical cases.

Keyword ： Microwave Circuit, Assembly, Manufacturing

The aim of these extreme introductory courses is to drive "too basic to ask" questions through the radical discussion.
In this session, basic skills and methods on microwave circuit measurements are introduced. A few points to be noted on of the measurements are also discussed from a viewpoint of theoretical and practical cases.

Keyword ： Microwave Circuit Measurements, S-parameter, Active Circuits, Passive Circuits, Amplifier