Faculty Profiles - FUKUMOTO Yuki

Papers - FUKUMOTO Yuki

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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

Analysis of Degradation of Transmission Characteristics of Underwater Antenna Due to Metal Enclosure of Autonomous Underwater Vehicle Reviewed International journal

Matsumura Shoichi, Matsushima Tohlu, Fukumoto Yuki, Eguchi Kazuhiro

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 437 - 440 2024.05

Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

The Autonomous Underwater Vehicle (AUV) is anticipated as a means of collecting underwater visual information using its built-in camera. While underwater radio wave communication via underwater antennas has been developed as a means of information collection, it is expected that the metal casing of AUV may adversely affect the transmission characteristics of antennas in underwater radio wave communication. Therefore, this report evaluates the impact of AUV's metal casing on antenna-to-antenna communication using an electromagnetic field simulator. The evaluation indicates that when the size of the antennas is larger than the AUV's metal casing, the impact on transmission characteristics is minimal even when the AUV is positioned between the antennas. On the other hand, when the metal casing is larger than the antenna size, the transmission characteristics between antennas degrade due to eddy currents flowing in the metal casing induced by antenna currents. Consequently, it is suggested that when attaching underwater antennas to AUVs, maintaining relatively good transmission characteristics, even with smaller antennas, is possible by appropriately configuring the size relationship and placement of the metal casing relative to the antennas.

DOI： 10.34385/proc.82.thuam1a.5

CiNii Research

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

Kuwabara Nobuo, Matsushima Tohlu, Fukumoto Yuki, Enoki Ryouya

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 186 - 189 2024.05

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)

The transmission line constructed with cable and ground plane is one of the radiated emission sources. Therefore, the characteristics of the line should be investigated to achieve electromagnetic compatibility. The numerical analysis has the merit that the characteristics can be investigated effectively, but the perfect modeling of this transmission line is difficult. In this paper, we evaluated the calculation accuracy from 0.1 MHz to 1000 MHz by comparing the calculating line constants with the measuring values. As a result, it was found that the characteristic impedance and phase constant can be calculated with a certain degree of accuracy, but the deviation of the attenuation constant is large.

DOI： 10.34385/proc.82.tuepm1a.4

CiNii Research

Development of Emulator Simulating Transmission of Undersea Radio Communication Reviewed International journal

Semba Takuto, Kawamoto Ayumu, Matsushima Tohlu, Fukumoto Yuki, Eguchi Kazuhiro, Wakisaka Toshiyuki

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 429 - 432 2024.05

Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

The authors' research group is engaged in research and development of undersea radio communication technology. To improve communication efficiency, antenna characteristic and communication system are being developed through actual measurement. However, it is not easy to conduct large-scale measurement because of the time and cost required for preparation. Therefore, an undersea communication emulator that simulates undersea radio wave attenuation is being built to simplify large-scale experiment. In this paper, an undersea communication emulator of the transmission characteristic obtained by actual measurement is fabricated, and comparison of transmission characteristic and communication performance are shown through communication experiment. As a result of evaluating the communication characteristics of the fabricated emulator, it was confirmed that the transmission characteristic was expressed with a difference of less than 1 dB in a bandwidth of approximately 85 % of the carrier frequency, and that the transmission rate could be simulated with an accuracy of less than 1 Mbps.

DOI： 10.34385/proc.82.thuam1a.3

CiNii Research

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

Kagawa Akito, Inoue Mao, Matsushima Tohlu, Fukumoto Yuki

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 457 - 460 2024.05

Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

In this report, we compared the immunity characteristics of wiring harnesses connecting automotive communication equipment at different wiring lengths. The communication behavior of an automotive harness connected to an evaluation module equipped with automotive Ethernet and exposed to radiated electromagnetic noise was compared for different wiring lengths. The S-parameters were measured under the same wiring conditions, and the frequency characteristics of the amount of noise applied were derived and compared with the length of the wiring. A reverberation chamber was used for the evaluation. From the results of each evaluation, changes in immunity characteristics due to differences in wiring length were confirmed for each frequency of electromagnetic waves, but no correlation was observed between communication quality characteristics and the results of S-parameter measurement. On the other hand, the frequency characteristics of the amount of noise applied also changed with the difference in wiring length, suggesting that a stable evaluation is possible with longer wiring lengths.

DOI： 10.34385/proc.82.thuam1c.1

CiNii Research

Communication Speed Estimation of Undersea Wavelet-OFDM Communication Under EM Noise Environment Reviewed International journal

Motomura Shiryu, Semba Takuto, Wakisaka Toshiyuki, Matsushima Tohlu, Fukumoto Yuki, Eguchi Kazuhiro

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 433 - 436 2024.05

Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

As the marine business expands, there is a growing demand for real-time capturing of autonomous underwater vehicles (AUVs) status using radio frequency communications. On the other hand, electromagnetic noise emitted by AUVs can interfere with communications.To investigate the impact of electromagnetic noise in undersea Wavelet-OFDM communication, the author constructed an experimental setup that simulates the radio wave transmission characteristics of underwater antennas without the experimental environment in the sea and introduced external noise to assess communication speed. The authors compared the noise power induced in the receiver to the communication speed using the proposed evaluation setup.
The results shows that when the distance between the loop antennas was 1 m, communication was disabled by applying a -90 dBm disturbance. Additionally, the author proposed a method to estimate communication speed using transmission characteristics and measured electromagnetic noise. The communication speeds calculated using the proposed method agreed with the measured results with a maximum error of 1.65 Mbps. Improving accuracy remains a challenge for future research.

DOI： 10.34385/proc.82.thuam1a.4

CiNii Research

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

Fujimura Makoto, Muto Fumiya, Matsushima Tohlu, Fukumoto Yuki, Takada Kohei, Kobayashi Koji

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 66 - 69 2024.05

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)

The impedance balance method is used as a countermeasure against electromagnetic noise in power electronic circuits. In a previous study, the impedance balance method was used to reduce the common-mode voltage in a three-phase inverter circuit. However, it has been difficult to reduce common-mode voltage using conventional methods in an electric compressor system with an integrated mechanical and electrical structure, where the three-phase inverter and motor are housed in a single housing. This research describes a method to reduce the common-mode voltage in an electric compressor system with an integrated mechanical and electrical structure, using an impedance balance method. The first is to reduce the impedance of the balancing elements added to the circuit, and the second is to increase the impedance of the three three-phase output line connecting the three-phase inverter and the motor. By combining these two methods, the frequency bandwidth of the reduction effect was expanded from 2 MHz to 30 MHz, and a reduction in common-mode voltage of up to 30 dB was confirmed.

DOI： 10.34385/proc.82.monpm2c.2

CiNii Research

Analysis of Mode Conversion Using Modal Equivalent Circuits for Immunity Evaluation of High-Speed Communication Equipment Reviewed International journal

Kawashima Takumi, Wakita Kazuya, Kaku Yoshifumi, Matsushima Tohlu, Fukumoto Yuki

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 333 - 336 2024.05

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)

In this report, the mechanism of mode conversion of interfering electromagnetic waves injected into communication equipment from coaxial cables to in-vehicle communication modules is evaluated and clarified from the viewpoint of immunity.A mode conversion equivalent circuit was used for this purpose.
Considering radiated immunity, the applied electromagnetic field induces a common-mode current in the coaxial cable, which propagates through the cable to the signal line inside the enclosure via a connector.
When microstrip lines are used within a printed circuit board, the imbalance difference between the two transmission lines causes a conversion from common-mode current to normal-mode voltage.
Furthermore, when the imbalance difference is small, the parasitic inductance between the ground connections at the connectors is dominant in the mode conversion.
To evaluate these phenomena, a mode transformation circuit with ideal transformers was created.
The circuit simulations were conducted using the model and a modal transmission line.
The obtained results showed the same trend as that of the 3D electromagnetic field simulation.

DOI： 10.34385/proc.82.wedpm1a.1

CiNii Research

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

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

IEEE Access 2024.01

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 2024.01

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 2024.01

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 2024.01

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.

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.

Simple Comparison Method of Countermeasure Effect for Common Mode Filter on Radiated Emission Considering Conversion from Differential Mode to Common Mode Reviewed

KIKUCHI Koichi, MUNEMOTO Yu, MATSUSHIMA Tohlu, KUWABARA Nobuo, FUKUMOTO Yuki

J106-B ( 8 ) 519 - 526 2023.08

Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal)

Each mixed-mode S-parameter of CMF has a phase characteristic, the phases are not the same, and the CMFs cannot be simply compared. In this study, as one way to confirm the usefulness of CMFs, we found a formula for equivalent common-mode voltage VEQ and calculated VEQ of each CMF for a square wave. Radiated emission levels were then evaluated by measuring CISPR 25. As a result, it was found that the magnitude relationship is the same as that of the equivalent common mode voltage VEQ.

DOI： 10.14923/transcomj.2022pep0009

CiNii Research

Transmission Characteristic Evaluation of Distribution Board in High-Speed Power Line Communication Reviewed

WAKISAKA Toshiyuki, MATSUSHIMA Tohlu, ENOKI Ryoya, KUWABARA Nobuo, FUKUMOTO Yuki

J106-B ( 8 ) 498 - 508 2023.08

Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal)

Today, with the increasing demand for IoT, there is a growing demand for high-speed power line communication (PLC) in large-scale facilities such as factories. So far, many studies have been conducted on the transmission characteristics of single-phase power lines in general households. and transmission characteristics including cross-phase communication have not been clarified. Therefore, in this paper, regarding transmission characteristics via distribution boards used in large-scale facilities such as factories, we first examine the signal propagation characteristics of a single breaker, showed that the mode S-parameter value increased. Then, we examined how the number of branches affects communication via distribution boards by measurement and analysis, and showed that in any case, it is close to 1/number of branches. By estimating the transmission characteristics via the distribution board according to the contents of this paper, it is possible to estimate the location where the PLC repeater should be installed.

DOI： 10.14923/transcomj.2022pep0001

CiNii Research

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