研究者詳細 - 福本　幸弘

論文 - 福本　幸弘

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

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

Wireless Networks 30 ( 5 ) 3599 - 3606 2024年07月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Electromagnetic fields unintentionally radiated from power-line communications used in factories interfere with wireless communications. It is important to distinguish the mechanism of this undesired and unintentional radiation from that of wired communication as it affects wireless communications. In particular, unintentional radiated emissions should be reduced in order to construct a stable wired/wireless communication network.This paper focuses on power-line communication as it is used in a factory. The power distribution network in the factory consists of multiple cables bundled together. The effects of cables other than the power cable that applies the communication signal to the radiated electromagnetic field are investigated. Some of the signal power reaching the reciever is converted into common-mode current by an imbalance mismatch. The common-mode current is one of the main causes of unwanted electromagnetic radiation. To predict this conversion, an imbalance difference model is created to account for multi-conductor transmission lines such as those in the power distribution network of the factory.The proposed model can calculate the amount of common-mode excitation associated with changes in the load condition of the power lines. To verify the proposed method, the authors measured the change in common-mode current due to the difference in pairs of power lines to which the signal is applied. The calculation using the proposed model could estimate the amount of reduction in common-mode current to within an error of 1 dB.

DOI： 10.1007/s11276-020-02475-0

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85197915508&origin=inward

Analysis of Degradation of Transmission Characteristics of Underwater Antenna Due to Metal Enclosure of Autonomous Underwater Vehicle 査読有り国際誌

Matsumura Shoichi, Matsushima Tohlu, Fukumoto Yuki, Eguchi Kazuhiro

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 437 - 440 2024年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

Kuwabara Nobuo, Matsushima Tohlu, Fukumoto Yuki, Enoki Ryouya

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 186 - 189 2024年05月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

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年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

Kagawa Akito, Inoue Mao, Matsushima Tohlu, Fukumoto Yuki

IEICE Proceeding Series ( The Institute of Electronics, Information and Communication Engineers ) 82 457 - 460 2024年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

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年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

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年05月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り国際誌

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年05月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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 査読有り

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

IEEE Access 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The manuscript introduces a radio wave-based wireless communication system tailored for Autonomous Underwater Vehicles (AUVs), optimized for underwater deployment. Initial experiments to ascertain the fundamental properties of a loop antenna were conducted in a small-scale water tank, followed by comprehensive communication and video transmission trials in a larger tank with an AUV. A specialized waterproof enclosure was developed to house a waterproof antenna, a Vector Network Analyzer (VNA), and a communication board. This setup facilitated the evaluation of the loop antenna's radio propagation attributes and the identification of frequencies conducive to underwater communication. Designed with practical deployment in mind, the system incorporates a 2-meter loop antenna for signal transmission and a 0.5m by 0.8m rectangular loop antenna integrated into the AUV for signal reception. Utilizing a wavelet Orthogonal Frequency Division Multiplexing (OFDM) communication board and tuning to lower frequencies, the system successfully established User Datagram Protocol (UDP) and Transfer Control Protocol (TCP) communications within a few meter radius from the transmitting antenna, achieving data transfer rates up to 6.8 Mbps.

DOI： 10.1109/ACCESS.2024.3457508

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204135158&origin=inward

Microwave Patch Antenna Placement on 6U CubeSat 査読有り

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

2024 International Conference on Electronics Packaging, ICEP 2024 193 - 194 2024年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Kyushu Institute of Technology (Kyutech) is developing a 6U CubeSat that is named 'VERTECS' (Visible Extragalactic background RadiaTion Exploration by CubeSat). This is an astronomical CubeSat designed to reveal star formation history by observing visible extragalactic background light [1] and the first satellite for Kyutech to rely on not UHF (around 400 MHz) but only microwave (>1 GHz) to communicate between the satellite and ground station. Microstrip patch antennas are adopted on this CubeSat due to desired characteristics such as low profile, lightweight, and non-deployable structure. However due to the performance of the microstrip patch antenna is limited such as directional radiation pattern and narrow operational bandwidth, the placement of the antenna on CubeSat is more critical compared to that of the conventional antenna for UHF communication, such as dipole and monopole antenna. In this paper, we describe choosing the antenna placement while considering antenna performance, including the coupling of transmission and reception antenna.

DOI： 10.23919/ICEP61562.2024.10535673

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85195481886&origin=inward

Matching Circuit to Improve Transmission Characteristic of Antenna for Undersea Communication 査読有り

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

2024 International Conference on Electronics Packaging, ICEP 2024 195 - 196 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A matching circuit is required to improve the transmission characteristics of an antenna for undersea radio communication. Even if the reflection coefficient, S11, the transmission characteristics will not necessarily improve in a system with high radio-wave attenuation in the sea. Therefore, the authors designed a matching circuit to maximize transmission efficiency in the frequency band used. However, it is necessary to acquire the transmission characteristics between the antennas through experiment or simulation for circuit design. In the proposed circuit, an N-section LC ladder circuit is used. When the proposed matching circuits are connected to the antenna, the transmission coefficient is improved up to 12 dB.

DOI： 10.23919/ICEP61562.2024.10535535

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85195487732&origin=inward

Investigation of Calculation Accuracy for Line Constants of Transmission Line Constructed With Cable and Ground Plane 査読有り

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年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199447935&origin=inward

Development of Emulator Simulating Transmission of Undersea Radio Communication 査読有り

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

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199453615&origin=inward

Comparison of the Dependence of Wiring Lengths of Radiated Immunity of Harnesses Connecting Automotive Communication Equipment 査読有り

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

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In this paper, 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.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199478287&origin=inward

Communication Speed Estimation of Undersea Wavelet-OFDM Communication under EM Noise Environment 査読有り

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

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199463191&origin=inward

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

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

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The impedance balance method is used as a countermeasure against electromagnetic noise in power electronic circuits. In a previous research, the authors' research group confirmed the reduction of common-mode voltage in a three-phase inverter circuit using the impedance balance method. 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.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199424771&origin=inward

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

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199467333&origin=inward

Analysis of Degradation of Transmission Characteristics of Underwater Antenna due to Metal Enclosure of Autonomous Underwater Vehicle 査読有り

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

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199460873&origin=inward

デファレンシャルモードからコモンモードへの変換も考慮した放射エミッションでのコモンモードフィルタ対策効果の簡易比較法査読有り

菊池浩一, 宗本悠有, 松嶋徹, 桑原伸夫, 福本幸弘

電子情報通信学会論文誌B 通信 ( 電子情報通信学会 ) J106-B ( 8 ) 519 - 526 2023年08月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

差動信号のインタフェースは多くの車載機器に使用されており，コモンモードフィルタ（CMF: Common Mode Filter）がキーデバイスとして使用される．CMFの特性指標としてミクスドモード・Sパラメータが使用され，デファレンシャルモード(DM)である信号がCMFの不均衡によりコモンモード(CM)に変換され放射エミッションに大きく寄与する．ミクスドモード・Sパラメータはそれぞれに位相特性が含まれており，元々発生するCM信号の位相とモード変換によって生じたCM信号の位相は同じではなく，単純に比較できない．そのためCMFの選択においても従来システムとして組み込んでCISPR25に準拠した形で比較評価を行う必要がある．本研究においては，CMFの有用性を確認する方法の一つとして等価コモンモード電圧 VEQ の計算式を求め，あるDM信号源とCM信号源の矩形波に対してそれぞれのCMFの VEQ を算出した．次に，信号源の条件が同じ波形を用いて36 MHzから196 MHzまでの放射エミッションレベルをCISPR25に準拠した測定により評価した．その結果，等価コモンモード電圧 VEQ と大小関係が同じ傾向だったことがわかった．

DOI： 10.14923/transcomj.2022pep0009

CiNii Research

高速電力線通信における分電盤の透過特性評価査読有り

脇坂俊幸, 松嶋徹, 榎凌弥, 桑原伸夫, 福本幸弘

電子情報通信学会論文誌B 通信 ( 電子情報通信学会 ) J106-B ( 8 ) 498 - 508 2023年08月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

今日，IoT化の需要増に伴い，工場等の大規模施設での高速電力線通信(PLC)の要望が高まっている．これまで，一般家庭における単相電力線における伝送特性等の研究は多く行われてきたが，大規模施設における分電盤を経由するPLC信号の透過特性に分岐数やブレーカーの構造が与える影響，及び異相間通信を含む透過特性は明らかにされていない．そこで，本論文では，工場等の大規模施設で利用される分電盤を経由する透過特性について，まずブレーカー単体における信号伝搬特性を検討し，漏電ブレーカーのキャパシタの影響により通常ブレーカーに比べてミクスドモードSパラメータ値が大きくなることを示した．そして，分電盤を経由する通信において分岐数がどのように影響するかを測定と解析により検討し，いずれの場合でもおおよそ分岐数分の1に近くなることを示した．本論文により分電盤を経由した透過特性を概算することで，PLCの中継器を設置すべき場所を推定することが可能となる．

DOI： 10.14923/transcomj.2022pep0001

CiNii Research

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