資料12-C

29th August 2020
Makoto Taromaru
th24 URSI-C (Japan) Chair

Activity Report of URSI-C Committee
Period: April 2019—August 2020
Since the 24th committee started, we have held scientific workshops seven times. This
document reports the 5th, 6th, and 7th meetings/workshops held during the period; theformer four workshops were described in our previous reports.
Remarks: The 8th workshop planned in April 2020 is postponed indefinitely this time,
due to the COVID-19 disaster.

– The 5th scientific workshop of the 24th URSI-C in Japan –Session title: "Current status and issues of antenna propagation technology in V2X
communications"

Convener: Prof. Takuji Arima (Tokyo University of Agriculture and Technology)
Date/time: 13:45—17:25, May 31st, 2019
Venue: Room "The meeting room 1 in the Tenbusu Naha" (Naha, Okinawa, Japan)
Registration fee: Free
Listed attendees: 20 persons
Local arrangement: Prof. Ryo Yamaguchi (Softbank)Presentations:

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14:10 - 14:20 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University)
14:20 - 15:10 "Analog OAM Multiplexing and Related Technologies"
Prof. Atsushi Sanada (Osaka University)
15:10 - 16:00 "Development of Millimeter-wave OAM Mode Multiplexing System
for High Capacity Backhaul"
Mr. Eisaku Sasaki (NEC)16:00 - 16:10 Coffee Break
16:10 - 17:00 "An experiment of 100 Gbps wireless transmission using OAMMIMO multiplexing technology using 28 GHz frequency band"
Dr. Doohwan Lee (NTT Network Innovation Laboratories)資料12-C

17:00 Closing

Reception

Held from 18:30 to 20:30 at the Niko in Naha City. The number of attendees is 15
persons.
The Steering committee meeting

It took place at the meeting room 1 in the Tenbusu Naha, from 13:00 to 13:30 on May
31st, 2019Concluding Remarks

From the development of high-speed mobile communications, a lot of researchers arediscussing the autonomous driving system. These systems must always be connected interms of information. Communication technologies that cannot tolerate disconnection
and large transmission delays are required.
This communication technology is called V2X communication in the sense ofcommunication with a mobile object. Propagation and signal processing about V2X
were widely discussed. Therefore, further development of V2X was expected.

資料12-C– The 6th scientific workshop of the 24th URSI-C in Japan –Session title: "Progress of Millimeter Wave Devices for Wireless Communications"

Convener: Atsushi Honda (Fujitsu Limited)
Date/time: 14:00—17:50, September 27th, 2019
Venue: Presentation Room, Shin-Kawasaki Technology Square, Fujitsu Limited(Saiwai-ku, Kawasaki, Kanagawa, Japan)
Registration fee: Free
Listed attendees: 39 persons
Local arrangement: Atsushi Honda (Fujitsu Limited)
Presentations:

14:00 - 14:10 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University)

14:10 - 15:00 "Recent trends in GaN HEMTs for improved performance"
Prof. Masaaki Kuzuhara (Fukui University)

15:00 - 15:50 "Millimeter wave GaN high power amplifier"Dr. Akira Inoue (Mitsubishi Electric Corp.)

15:50 - 16:00 Coffee Break (10 min.)

16:00 - 16:50 "Recent Trend of Millimeter-wave Band Pass Filter design"
Dr. Shigemitsu Tomaki (TDK Corp.)

16:50 - 17:40 "ADI mmWave solution for 5th generation"
Dr. Satoshi Baba (Analog Devices Inc.)

17:50 Closing

Reception
Held from 18:30 to 21:00 at "Kenko Chuka-an Seiren", Shin-Kawasaki Mitsui Buildingin Kawasaki city. The number of attendees was 13 persons.
The Steering committee meeting
It took place from 13:30-14:00 on September 27th, 2019 at the room for the scientificworkshop.
Concluding Remarks
The technical standardization for high frequency bands including 24-30 GHz band areprogressed to utilize the bands for 5th generation wireless communications. In addition,
mobile communication services using these frequency bands will be started from 2020 in資料12-C

Japan. Device manufactures are preparing their products for the market of the highfrequency bands assuming the increase of demands of devices for wireless base stationsor terminals of the frequency bands. Therefore, steering committee of URSI-C planned
to have a workshop for reviewing the recent development of technologies such as highpower output power amplifiers or LTCC filters.
Prof. Kuzuhara (Fukui University) presented technology trends of GaN HEMT andthe application examples utilizing the feature of the devices.
Dr. Inoue (Mitsubishi Electric Corp.) presented actual design examples of high-power
amplifiers utilizing GaN devices and amplifier structures for hybrid beam-forming basestations.
Dr. Tomaki (TDK Corp.) presented examples of band pass filters at millimeter-wave
band utilizing LTCC technologies, and application examples of antenna filters.
Dr. Baba (Analog Devices) presented examples of millimeter wave base station utilizing
DAC/ADC and up/down converters, and he demonstrated beam-forming performanceusing the devices.
In this workshop, important device progress was reported in every presentation for
the future utilization of high frequency bands. In addition, presenters and audiences had
active discussion in the presentations. This workshop was very meaningful in the aspectof letting known the activities of URSI-C widely.

資料12-C– The 7th scientific workshop of the 24th URSI-C in Japan –Session title: "Semiconductor device technologies supporting high-speed big-capacity radiocommunications beyond 5G"

Convener:
Date/time:
Venue:

Prof. Taiichi Otsuji (Tohoku University)
13:30—17:25, December 6th, 2019
Room No. 23, EE-Bldg. 1F, Faculty of Eng., Koorimoto Campus,
Kagoshima University, Kagoshima, Kagoshima pref.
Registration fee:Free
Listed attendees:
20 persons
Technical arrangement: Prof. Taiichi Otsuji (Tohoku University)
Local arrangement:
Prof. Kenjiro Nishikawa (Kagoshima University)
Presentations:
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13:45 - 13:55 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University)
13:55 - 14:45 "Advances and future trends in 5G mobile communications systems"
Prof. Fumiyuki Adachi (Tohoku University)
14:45 - 15:35 "Study on phase noise reduction in CMOS oscillators for use in 5G"
Dr. Adel Barakat (Kyushu University)
15:35 - 15:45 Coffee Break (10 min.)
15:45 - 16:35 "Planar-antenna-integrated high-power-added-efficiency push-pull
amplifier for 5G mobile communications systems"
Prof. Takeshi Kuboki (Kyushu University)
16:35 - 17:25 "Control of THz waves by using semiconductor optical devices
towards high-speed large-capacity wireless communications"Dr. Kazutoshi Kato (Kyushu University)
17:25 ClosingReception

It was held from 18:30 to 20:30 at Juan, Kurobagoshima-Chuo Ten, Kagoshima city,Kagoshima pref. The number of attendees was 20 persons.
The Steering committee meeting:

It took place from 13:00 to 13:25 on December 6th, 2018, at Room No. 23, EE-Bldg.
1F, Faculty of Eng., Koorimoto Campus, Kagoshima University.

資料12-CConcluding Remarks

As mobile radio communication technology is increasing in speed and capacity, 5G
releases are approaching next year, and research and development of the next generation
beyond 5G or 6G are also emerging. This workshop focused on semiconductor device
technology that supports high-speed, high-capacity wireless communications of andbeyond 5G, attracting 20 attendees. Four leading researchers working at the forefront ofa series of fields ranging from devices to circuits and systems presented the state-of-theart technology and ideas. They stimulated deep discussions among attendees, helping
deepen a common understanding of future prospects.
Dr. Fumiyuki Adachi (Tohoku Univ.) explained the technology roadmap up to andbeyond the 5th generation (5G) mobile communication system. Efforts have been madeto improve spectrum utilization efficiency up to 4G but improving energy utilization
efficiency (Whr/bit) is also an important issue after 5G. Distributed MIMO radio isexpected as a breakthrough. The impact and R&D issues beyond 5G-6G toward further
advancement were addressed.
Dr. Baccarat Adele (Kyushu Univ.) gave a presentation on the latest achievements
regarding 5G CMOS oscillators, specifically Ku-to-K band CMOS-VCO (VoltageControlled Oscillator) phase noise reduction technology. By introducing LC series
resonance on the low or high frequency side of the oscillation band, he proposed that
the Q value of the oscillation band and the suppression ratio can be improved
simultaneously. And in the 25 GHz band, low power consumption equivalent to theconventional one and low transport noise exceeding the conventional performance in awide specific band have been realized.
Dr. Takeshi Kuboki (Kyushu Univ.) gave a presentation on the latest achievements
regarding a planar antenna integrated high-efficiency push-pull amplifier for 5G radio.
First, 5 GHz band high-efficiency planar slot antenna integrated CMOS push-pull
power amplifier. Secondly, as a 300 GHz band integrated planar antenna technology forpost 5G systems, impedance matching other than 50 ohms for amplifiers on board wasproposed. By improving power load efficiency, a maximum PAE of 30.9% wasachieved. The superiority of independent slot antenna was discussed.
Dr. Kazutoshi Kato (Kyushu Univ.) gave a presentation on the latest achievements
regarding terahertz wave control by semiconductor optical devices for high-speed andhigh-capacity wireless communication. Photomixing diodes capable of generating
coherent millimeter and submillimeter waves by mixing two laser lights can easily
achieve phase modulation in the output of the terahertz waves by controlling the phasebetween the two light waves, but the remaining critical issue is the phase noise of laser資料12-C

light. It has been shown that the problem can be solved by arraying a novel photonic
phase modulator capable of chromatic dispersion control and a photonic integration
with an antenna.
In summary, this meeting was very valuable opportunity to understand and share thestatus of R&D and technical issues and prospects towards beyond 5G and 6G.