Faculty Profiles - MATSUSHIMA Tohlu

Papers - MATSUSHIMA Tohlu

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Performance Analysis of Underwater Radiofrequency Communication in Seawater: An Experimental Study Reviewed

Alahmad R., Alraie H., Hasaba R., Eguchi K., Matsushima T., Fukumoto Y., Ishii K.

Journal of Marine Science and Engineering 12 ( 11 ) 2024.11

Analysis of Common-Mode Filter Effect for Induced Voltage by Bulk Current Injection Using Chain Parameter Matrix Reviewed

Kuwabara N., Matsushima T., Fukumoto Y.

IEEE International Symposium on Electromagnetic Compatibility 302 - 307 2024.01

Wavelet OFDM Wireless Communication System for Autonomous Underwater Vehicles Using Loop-Shaped Antennas in Underwater Environments Reviewed International journal

Hasaba R., Eguchi K., Wakisaka T., Hirokawa J., Hirose M., Matsushima T., Fukumoto Y., Nishida Y., Ishii K.

IEEE Access 12 129633 - 129645 2024.01

Compensating Method of Equivalent Current Sources of LSI-Core Macromodel Considering Voltage Fluctuations in On-Chip Power Distribution Network Reviewed International journal

Tanaka H., Matsushima T., Yano Y., Wada O.

IEEE Transactions on Electromagnetic Compatibility 64 ( 4 ) 1250 - 1256 2022.08

Electromagnetic Wave Absorption Properties of SiC-Carbon Composites Reviewed

Ishii Junko, Kawada Tetsuya, Mizokami Shingo, Matsushima Tohlu, Ikari Tomonori, Naitoh Masamichi

e-Journal of Surface Science and Nanotechnology ( The Japan Society of Vacuum and Surface Science ) advpub ( 0 ) 2025.05

Language：English Publishing type：Research paper (scientific journal)

Electromagnetic wave (EMW)-absorbing materials have received significant attention in recent years owing to their important role in mitigating electromagnetic pollution caused by the increased use of wireless communication devices. SiC is expected to be one of the EMW absorbers because of its excellent properties such as chemical stability, mechanical stability, and high hardness; however, SiC alone does not have high EMW absorption performance. SiC-carbon composites were prepared as high-performance EMW-absorbing materials by thermal decomposition of 6H-SiC(0001) substrates. The surface morphology and chemical composition of the pure and annealed samples were evaluated using scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Carbon clusters with sizes of several micrometers were formed on the SiC surface after annealing, which formed in an interfacial structure between SiC and carbon and also increased the surface area of carbon. These microstructural changes improved the electromagnetic absorption of the SiC-carbon composite, which was confirmed by transmission attenuation measurements.

DOI： 10.1380/ejssnt.2025-030

CiNii Research

Equivalent Common Mode Voltage Measurement for Simplified Verification of Suppression Effect in Automotive Common Mode Choke Coils Reviewed

Kikuchi Koichi, Matsushima Tohlu, Kuwabara Nobuo, Fukumoto Yuki

Journal of The Japan Institute of Electronics Packaging ( The Japan Institute of Electronics Packaging ) advpub ( 0 ) 2025.01

Language：Japanese Publishing type：Research paper (scientific journal)

This paper uses a sinusoidal wave with mixed differential mode and common mode components to determine the equivalent common mode voltage generated at the common mode termination on the load side of the components, namely Through, CMC1, and CMC2 (CMC: Common Mode Choke coil), through simulation and measurement.The relationship to the mixed-mode S-parameters used as a recommended value for CMC was then examined.Our results show that using the equivalent common mode voltage obtained from the input waveform with mixed modes allows for an evaluation that considers the phase difference between modes caused by the CMC's mixed-mode S-parameters. Therefore, we demonstrated that this can be utilized as one guideline among many parameters used for a performance comparison of CMCs.

DOI： 10.5104/jiep.jiep-d-24-00112

CiNii Research

Imbalance difference model for prediction of unintentional radiated emission from 10-wire power cable using for power line communication Reviewed

Matsushima T., Okumura H., Kuwabara N., Fukumoto Y.

Wireless Networks 30 ( 5 ) 3599 - 3606 2024.07

Investigation of Calculation Accuracy for Line Constants of Transmission Line Constructed With Cable and Ground Plane Reviewed

Kuwabara N., Matsushima T., Enoki R., Fukumoto Y.

2024 IEEE Joint International Symposium on Electromagnetic Compatibility, Signal and Power Integrity: EMC Japan/Asia Pacific International Symposium on Electromagnetic Compatibility, EMC Japan/APEMC Okinawa 2024 - Proceedings 186 - 189 2024.05

Development of Emulator Simulating Transmission of Undersea Radio Communication Reviewed

Semba T., Kawamoto A., Matsushima T., Fukumoto Y., Eguchi K., Wakisaka T.

Comparison of the Dependence of Wiring Lengths of Radiated Immunity of Harnesses Connecting Automotive Communication Equipment Reviewed

Kagawa A., Inoue M., Matsushima T., Fukumoto Y.

Communication Speed Estimation of Undersea Wavelet-OFDM Communication under EM Noise Environment Reviewed

Motomura S., Semba T., Wakisaka T., Matsushima T., Fukumoto Y., Eguchi K.

Application of the Impedance Balance Method to Electric Compressor System with an Integrated Mechanical and Electrical Structure Reviewed

Fujimura M., Muto F., Matsushima T., Fukumoto Y., Takada K., Kobayashi K.

Analysis of mode conversion using modal equivalent circuits for immunity evaluation of high-speed communication equipment Reviewed

Kawashima T., Wakita K., Kaku Y., Matsushima T., Fukumoto Y.

Study on Miniaturized, Circularly Polarized Microstrip Patch Antenna Using DGS at S-band Reviewed

Ta L.P., Matsushima T., Nakayama D., Hirose M.

2024 IEEE International Workshop on Antenna Technology, iWAT 2024 143 - 146 2024.04

Microwave Patch Antenna Placement on 6U CubeSat Reviewed

Nakayama D., Sano K., Matsushima T., Fukumoto Y.

2024 International Conference on Electronics Packaging, ICEP 2024 193 - 194 2024.04

Matching Circuit to Improve Transmission Characteristic of Antenna for Undersea Communication Reviewed

Miki S., Kuwahara K., Eguchi K., Nakayama D., Matsushima T., Fukumoto Y.

2024 International Conference on Electronics Packaging, ICEP 2024 195 - 196 2024.04

Analysis of Degradation of Transmission Characteristics of Underwater Antenna due to Metal Enclosure of Autonomous Underwater Vehicle Reviewed

Matsumura S., Matsushima T., Fukumoto Y., Eguchi K.

EMC Japan/APEMC Okinawa Symposium Report International journal

Toyota Y., Matsushima T.

IEEE Electromagnetic Compatibility Magazine 13 ( 2 ) 89 - 94 2024.01

Evaluation of Transmission Attenuation in Glass with Varying Angle of Incidence for 28 GHz Band Reviewed

Tsunenari S., Matsushima T., Fukumoto Y.

Asia-Pacific Microwave Conference Proceedings, APMC 491 - 493 2023.12

Experimental Study of Underwater RF Communication for Live Video Transmission for AUVs Application Reviewed

Alahmad Raji, Ishii Kazuo, Nishida Yuya, Fukumoto Yuki, Matsushima Tohlu

Journal of Robotics, Networking and Artificial Life ( ALife Robotics Corporation Ltd. ) 10 ( 1 ) 84 - 90 2023.10

Language：English Publishing type：Research paper (scientific journal)

Autonomous Underwater Vehicles (AUVs) require long-distance communication, especially in the deep sea. Acoustics communication and wireless optical communication have limitations of low latency and water conditions effects respectively. Radiofrequency (RF) communication provides a high data rate with free orientation of the transmitter/receiver antennas. However, electromagnetic waves are highly restricted by high attenuation over short distances in the underwater medium. In this study, we investigated the RF communication in a tank full of seawater. A loop antenna and rectangular antenna were used for the base station and AUV respectively. The experiments were conducted to measure the transmission rate with different distances between the base station and the AUV using both User Datagram Protocol (UDP) and Transmission Control Protocol (TCP). Live video streaming with framerate analysis was considered. The results show the effect of the distance between the transmitter and receiver on the transmission rate, in addition, to the antenna's stability has huge effects on the connection stability. We successfully achieved a High-Definition (HD) video streaming with 25fps for over 1 meter.

DOI： 10.57417/jrnal.10.1_84

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176586532&origin=inward

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Papers - MATSUSHIMA Tohlu