Faculty Profiles - MATSUSHIMA Tohlu

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

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

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

Underwater Live Video Streaming Experiment Using Radio Frequency Communication for AUVs Reviewed

Alahmad R., Nishida Y., Ishii K., Fukumoto Y., Matsushima T.

Proceedings of International Conference on Artificial Life and Robotics 499 - 503 2023.10

Common-mode Current Converted from PLC Signal in Three-phase Distribution Network with Earth Leakage Circuit Breaker Reviewed

Enoki R., Wakisaka T., Matsushima T., Fukumoto Y.

IEEE International Symposium on Electromagnetic Compatibility - EMC Europe 2023-September 2023.09

Analysis of Common-mode Voltage during Switching of Individual IGBTs in Three-phase Inverter Reviewed

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

IEEE International Symposium on Electromagnetic Compatibility - EMC Europe 2023-September 2023.09

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：Corresponding 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

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：Corresponding 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

Comparison of Suppression Effect by CMF for UTP and STP Lines Using Chain Parameter Matrix Reviewed

Kuwabara N., Matsushima T., Fukumoto Y.

2023 IEEE Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMC+SIPI 2023 196 - 201 2023.07

Experimental Study of Wavelet-OFDM Radio Communication System for AUVs Under Seawater Reviewed

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

17th European Conference on Antennas and Propagation, EuCAP 2023 2023.03

海中における伝送特性を用いた Wavelet-OFDM 通信の通信速度推定 Reviewed

元村史龍, 仙波拓人, 桑原堅誠, 脇坂俊幸, 松嶋徹, 福本幸弘

エレクトロニクス実装学術講演大会講演論文集 ( 一般社団法人エレクトロニクス実装学会 ) 37 ( 0 ) 14A5-4 2023.03

On-Chip Power Integrity Simulation Using LSI-Core Macromodels Considering Voltage Fluctuations Caused by Inter-Function-Block Interference Reviewed

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

IEEE Transactions on Electromagnetic Compatibility 65 ( 1 ) 334 - 342 2023.02

Basic Study of Communication System in Seawater Using Magnetic Field Coupler and Wavelet OFDM Reviewed

Hasaba R., Eguchi K., Wakisaka T., Sato H., Hirokawa J., Hirose M., Matsushima T., Fukumoto Y.

Asia-Pacific Microwave Conference Proceedings, APMC 2022-November 488 - 489 2022.11

Electromagnetic Noise Evaluation of Transceiver IC and Communication Modules in CAN-FD Communication Reviewed

Nishida S., Matsushima T., Fukumoto Y.

2022 IEEE CPMT Symposium Japan, ICSJ 2022 76 - 79 2022.11

Circuit analysis of common mode current in coupling coils for HF broadband communication system Reviewed

Matsushima T., Kuwahara K., Fukumoto Y.

2022 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2022 19 - 21 2022.09

Rapid Calculation Method of Three-Dimensional Communication Range in HF Broadband Communication System Reviewed

Kuwahara K., Fukumoto Y., Matsushima T., Wakisaka T.

2022 IEEE International Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMCSI 2022 106 - 111 2022.08

Analysis of CM-Signal Suppression Effect from DM Signal by Common-Mode Choke Coil Using Chain-Parameter Matrix Reviewed

Kuwabara N., Matsushima T., Fukumoto Y.

2022 IEEE International Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMCSI 2022 181 - 186 2022.08

Analysis Method of Transmission Characteristics between Coil Antennas for Short-Range Wireless Communication

Wakisaka Toshiyuki, Kuwahara Kensei, Semba Takuto, Matsushima Tohlu, Fukumoto Yuki

Journal of The Japan Institute of Electronics Packaging ( The Japan Institute of Electronics Packaging ) 25 ( 4 ) 309 - 313 2022.07

A Design Method for the Loop Antenna to Control a Range of HF-Broadband Wireless Communication Reviewed

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 36 ( 0 ) 24B5-1 2022.03

Quantitative Evaluation of Reflection Characteristics of Power Distribution Equipment during TDR Measurement Reviewed

Uejima Hiroaki, Matsushima Tohlu, Hisakado Takashi, Wada Osami

IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan ) 142 ( 2 ) 139 - 149 2022.02

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

The authors propose an effective method of fault location utilizing TDR measurement in overhead distribution systems. Past studies have shown that reflected waves from accident points such as short circuits, ground faults, and disconnections can be observed in overhead distribution systems. In addition, it is known that the retaining insulators and pulling insulators of overhead power distribution line cause reflected wave because these equipment act as capacitor. On the other hand, although there are many other distribution facilities, the reflection characteristics cannot be evaluated quantitatively. Based on the above, the purpose of this study is to create an equivalent circuit model for TDR measurement for various distribution facilities existing in the overhead distribution system. For modeling, an equivalent circuit model is created by the power system instantaneous value analysis program XTAP, and the experimental results and simulation results are compared and evaluated.

DOI： 10.1541/ieejpes.142.139

Other Link： https://www.jstage.jst.go.jp/article/ieejpes/142/2/142_139/_pdf

Communication Distance Estimation for Power Line Communication Using Various Differently Constituted Power Cables Reviewed

Fukumoto Y., Oshikawa K., Matsushima T., Kuwabara N., Wakisaka T.

IEEJ Transactions on Electrical and Electronic Engineering 17 ( 4 ) 498 - 505 2021.12

Transmission line pulse method with arbitrary characteristic impedance for immunity evaluation of ESD protection device Reviewed

Tanaka K., Matsushima T., Fukumoto Y.

2021 IEEE CPMT Symposium Japan, ICSJ 2021 21 - 24 2021.12

Circuit analysis of radiation reaction in metamaterials by retarded electromagnetic coupling Reviewed

Nakata R., Hisakado T., Matsushima T., Wada O.

IET Circuits, Devices and Systems 16 ( 4 ) 311 - 321 2021.11

Verification of fault location by TDR measurement on an actual line including multiple ground-mounted equipment Reviewed

Oasa J., Yamanaka M., Higashiyama S., Inaoka Y., Hisakado T., Wada O., Matsushima T., Hirayama T., Yamaoka K.

IET Conference Proceedings 2021 ( 6 ) 1274 - 1278 2021.09

Fault Location in 6.6kV Overhead Distribution System by Comparing TDR Waveforms Before and After Failure Reviewed

Taketani Daisuke, Sasaoka Tsuyoshi, Kayo Zuien, Matsushima Tohlu, Hisakado Takashi, Wada Osami

IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan ) 141 ( 9 ) 590 - 596 2021.09

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

The authors propose an effective method of fault location in overhead distribution system. In past studies, short pulse with high frequency injected into overhead distribution system can propagate through about 1km distance, but it has been a problem that pulse reflect at other than a fault point. In other words, it is necessary to find out a fault point from multiple reflected waves. In our proposed method, it is possible to extract a change of a fault point by comparing TDR (Time Domain Reflectometry) waveforms before and after failure. In this paper, we clarify theoretical concept and organize the algorithm of comparing TDR waveforms. Moreover we verify effectiveness of the proposed method by experiments in real-scale distribution system after confirming pulse transmission properties of section switch. The verification results show that the proposed method can locate a fault point (short-circuit fault or ground fault) with accuracy of tens of meters or less.

DOI： 10.1541/ieejpes.141.590

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85114385787&origin=inward

Single-Conductor Transmission Line Model Incorporating Radiation Reaction Reviewed International journal

Tashiro D., Hisakado T., Matsushima T., Wada O.

IEEE Transactions on Electromagnetic Compatibility 63 ( 4 ) 1065 - 1077 2021.08

Calculation of Radiated Emission from STP Cable by Chain-Parameter-Matrix Reviewed

Kuwabara N., Matsushima T., Fukumoto Y.

2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021 1087 - 1092 2021.07

Simulation of mode division multiplex transmission method in shielded four-wire cable Reviewed

Matsushima T., Sato T., Fukumoto Y., Kuwabara N.

2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021 570 - 574 2021.07

Common-mode Reduction Method of LVDS by Imbalance Difference Control Reviewed

WADA Osami, SAITO Hiroaki, YANO Yusuke, HISAKADO Takashi, MATSUSHIMA Tohlu

J104-B ( 6 ) 453 - 460 2021.06

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

Considering that the LVDS (Low Voltage Differential Signaling) driver is a current differential drive system, we propose a method to reduce common mode generation when the transmission system not perfectly balanced is driven by the LVDS driver. The common mode of the unbalanced system is reduced by adding a simple balance compensation circuit using resistors. Simulations and experiments show that the common mode generation can be significantly reduced even in a system where the degree of imbalance deviates considerably from 0.5. For the quasi-differential transmission system with LVDS driver and balance compensation, we confirmed the reduction of common-mode potential fluctuation by experiments.

DOI： 10.14923/transcomj.2020pep0007

Evaluation of influence to electromagnetic environment on outside of building by PLC system using three-wire three-phase power line Reviewed

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

Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) 214 ( 2 ) 2021.06

Equivalent Circuit of Common-Mode Choke Coil Considering with Conversion from Differential-Mode Signal to Common-Mode Disturbance Reviewed International journal

Kuwabara N., Matsushima T., Fukumoto Y.

2021 13th International Workshop on the Electromagnetic Compatibility of Integrated Circuits, EMC Compo 2021 59 - 64 2021.03

Evaluation of influence to electromagnetic environment on outside of building by PLC system using three‐wire three‐phase power line Reviewed

Wakisaka Toshiyuki, Matsushima Tohlu, Koga Hisao, Okumura Hiroyuki, Kuwabara Nobuo, Fukumoto Yuki

Electrical Engineering in Japan ( Wiley ) 214 ( 2 ) 2021.02

Experimental investigation of communication quality degradation of 1000BASE-T1 by pulse disturbance Reviewed

Yano Yusuke, Matsushima Tohlu, Wada Osami

IEICE Communications Express ( The Institute of Electronics, Information and Communication Engineers ) 9 ( 12 ) 593 - 598 2020.12

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

Adverse effect of pulse disturbances on the communication quality is investigated experimentally on in-vehicle Ethernet (1000BASE-T1, IEEE 802.3bp). Common- and differential-mode pulse disturbances were injected into communication cables by a method referring to the coupling network described in IEC 62228-5. As a result, it was revealed that steep change of differential signal due to pulse disturbance degrades the communication quality at a specific pulse width.

DOI： 10.1587/comex.2020COL0019

Other Link： https://ci.nii.ac.jp/naid/130007871606

Evaluation of Influence to Electromagnetic Environment on Outside of Building by PLC System using Three-wire Three-phase Power Line Reviewed

Wakisaka Toshiyuki, Matsushima Tohlu, Koga Hisao, Okumura Hiroyuki, Kuwabara Nobuo, Fukumoto Yukihiro

IEEJ Transactions on Fundamentals and Materials ( The Institute of Electrical Engineers of Japan ) 140 ( 12 ) 557 - 564 2020.12

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

In this paper, the influence to electromagnetic environment was evaluated on the outside of buildings where power line communication (PLC) systems were installed to a three-wire three-phase power distribution line. The electric field strength was measured at 140 points in five factories, in two office buildings, and in one stadium. Since many radio waves existed in the environment, the electric field strength when PLC system was operated and was not operated was measured. The influence was evaluated by the cumulated occurrence probability because the frequency characteristics of the electric filed strength changed by the measurement points. The results showed that the occurrence probability was not changed when the PLC system was operated and was not operated. The electric field strength was calculated by the common mode current obtained from the test result, and this indicated that the occurrence probability was lower than the measured occurrence probability of electric field strength.

DOI： 10.1541/ieejfms.140.557

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85097227314&origin=inward

Evaluation of the magnetic field strength by using a scale model for power line communication Reviewed

Dai-ichiro Koike, Hiroyuki Okumura, Tohlu Matsushima, Yuki Fukumoto

International Conference on Emerging Technologies for Communications 2020.12

TDR simulation using equivalent circuit of actual power distribution network to detect ground fault Reviewed International journal

Fumikazu Kobayashi, Tohlu Matsushima, Yuki Fukumoto

International Conference on Emerging Technologies for Communications 2020.12

Differential-/Common-Mode Conversion Loss and LCL/TCL Measurement Methods Reviewed

Matsushima T., Sugiura A., Wada O.

IEEE Transactions on Electromagnetic Compatibility 62 ( 5 ) 1830 - 1839 2020.10

Investigation of Multi-Cable Effect to Radiated Emission from Cable Used for Power Line Communication Reviewed

Matsushima T., Okumura H., Kuwabara N., Iwasaki M., Koike D.I., Fukumoto Y.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020.09

Cancellation of common-mode excitation by SCD21and SCC21of CMF due to phase relationship between DM and CM voltages Reviewed

Matsushima T., Kikuchi K., Ishibashi K., Fukumoto Y., Kuwabara N.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020.09

Analysis of Cable Length Dependency on Common Mode Current by Using Scale Model for Power Line Communication Reviewed

Koike D.I., Okumura H., Matsushima T., Fukumoto Y., Kuwabara N.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020.09

Method of implementing radiation resistance to analysis model for radiated emission using chain parameter matrix Reviewed

Kuwabara Nobuo, Matsushima Tohlu, Fukumoto Yuki

IEICE Communications Express ( The Institute of Electronics, Information and Communication Engineers ) 9 ( 9 ) 446 - 450 2020.09

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

The analysis method using the chain parameter matrix (F-matrix) has been proposed for calculating radiated emission from the cable used by power line communication (PLC). In this paper, the radiation resistance was implemented to the F-matrix as the load of the common mode current which was converted from the differential mode PLC signal by the unbalance of the transmission system and was considered as the emission source. The calculated result for the simple cable model was compared to the measurement value and to the calculation value of which the radiation resistance was not considered. The investigation result indicated that the influence of radiation resistance appeared at the frequency where the high radiated emission was observed.

DOI： 10.1587/comex.2020XBL0070

Other Link： https://ci.nii.ac.jp/naid/130007871603

TDR Measurement with Corresponding to Utility-Pole Span Resolution for Fault Location in Real-Scale Distribution System Reviewed

Oe Shinpei, Uejima Hiroaki, Sasaoka Tsuyoshi, Matsushima Tohlu, Hisakado Takashi, Wada Osami

IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan ) 140 ( 9 ) 662 - 667 2020.09

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

The authors propose a new and more efficient method to search for fault points by injected short pulse with high frequency into distribution line. This method, which is called as TDR measurement, enables to find the fault point easily by measuring propagation time of the pulse reflected due to impedance change at the fault point. In this paper, the proposed method is experimented in real-scale distribution system with about 700m distance which is isolated by DAS (Distribution Automation System) as outage area. The measurement result shows that an injected pulse with corresponding to utility pole span resolution is able to propagate through about 700m distance, and each reflected wave by several brunches and terminals is observed clearly in the real-scale distribution system. And the measurement result corresponds with the simulation result of the test equivalent circuit model. Moreover, the authors measured reflected waves from a fault point (short circuit, broken wire, or grounding) in test circuit. As the results, reflected waves from every fault point were confirmed by simulation, and they depend on the fault type. We calculated the fault location from the pulse velocity and the propagation time of the reflected wave, and the result nearly corresponded to the actual setting. In addition, the measured wave corresponds to the simulation result using equivalent circuit model of each fault point.

DOI： 10.1541/ieejpes.140.662

Other Link： https://ci.nii.ac.jp/naid/130007894883

Measurement of throughput degradation due to pulse disturbance in power line communication Reviewed International journal

Kyoko Kadoyoshi,Kazumasa Oshikawa,Toshiyuki Wakisaka,Tohlu Matsushima,Yuki Fukumoto

In 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE 2020.09

Influence of S_{{cd}21} Characteristics of Common-Mode Filter on Radiated Emission from UTP Cable Reviewed

Kikuchi K., Matsushima T., Ishibashi K., Kuwabara N., Fukumoto Y.

2020 IEEE International Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMCSI 2020 386 - 391 2020.07

Measurement of Differential Mode Impedance and Longitudinal Conversion Loss for In-Factory High-Speed PLC System using Three-Phase Power Distribution System Reviewed

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

2020 IEEE International Symposium on Power Line Communications and its Applications, ISPLC 2020 2020.05

Characteristics of Radiated Emission by PLC Signal from Three-wire Power Cable Reviewed

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

EMC Europe 2019 - 2019 International Symposium on Electromagnetic Compatibility 267 - 272 2019.09

Electromagnetic Compatibility of Wired Communication for IoT Devices

Matsushima Tohlu

Proceedings of IIAE Annual Conference ( The Institute of Industrial Applications Engineers ) 2019 ( 0 ) 1 - 1 2019.09

Measurement of Transmission Characteristics for Long-distance Power Line Communication

Ohara Soichiro, Kobayashi Fumikazu, Oshikawa Kazumasa, Wakisaka Toshiyuki, Matsushima Tohlu, Fukumoto Yuki

Proceedings of IIAE Annual Conference ( The Institute of Industrial Applications Engineers ) 2019 ( 0 ) 41 - 41 2019.09

Peer-to-Peer Energy Transfer by Power Gyrators Based on Time-Variable-Transformer Concept Reviewed

Kiss D., Hisakado T., Matsushima T., Wada O.

IEEE Transactions on Power Electronics 34 ( 8 ) 8230 - 8240 2019.08

Design for reduction of far-end crosstalk in four-channel differential transmission line using per-unit-length parameters Reviewed

Matsushima T., Hisakado T., Wada O., Matsuda A., Hirano T.

2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019 808 - 811 2019.06

Calculation of Electromagnetic Field Radiated from Power Line Communication of Three Wires System Reviewed

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

2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019 704 - 707 2019.06

非対称スイッチング電源回路に対するインピーダンスバランス法によるコモンモードノイズ低減 Reviewed

西本太樹, 山岡正拓, 山田徹, 松嶋徹, 和田修己

電子情報通信学会論文誌B J102-B ( 3 ) 184 - 193 2019.03

帯域制限されたDSSS/CCK/OFDM変調に対する狭帯域干渉波の周波数の違いを考慮したPER推定と最適方式選択 Reviewed

高谷和宏, 奥川雄一郎, 富田大將, 梅田康希, 松嶋徹, 小川将克, 久門尚史, 和田修己

電子情報通信学会論文誌 B J102-B ( 3 ) 2019.03

Experimental study of the relationship between maximum common mode current and maximum magnetic field strength using a simple power distribution line model Reviewed

Okumura Hiroyuki, Matsushima Tohlu, Kuwabara Nobuo, Yamamoto Takeshi, Wakisaka Toshiyuki, Fukumoto Yuki

IEICE Communications Express ( The Institute of Electronics, Information and Communication Engineers ) 8 ( 5 ) 178 - 183 2019.03

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

The relation between maximum common mode current and maximum radiated magnetic field strength was experimentally studied using a simple power distribution line model. The common mode current was measured along the cable and the radiated magnetic field strength was measured around the model. They were evaluated using the S21 parameter. The frequency characteristic of both the maximum current and the maximum strength showed a closely similar pattern. Our evaluation of their correlation indicated that the relation between the maximum common mode current and the maximum radiated magnetic field strength could be represented by a straight line, and that 80% of the measured data was contained within 2 dB of the regression line.

DOI： 10.1587/comex.2019XBL0004

Other Link： https://ci.nii.ac.jp/naid/130007641560

妨害波パラメータに対するEthernet通信のパケットエラーレートの変化

石橋健太, 松嶋徹, 福本幸弘

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 33 ( 0 ) 12C2 - 4 2019.03

モーメント法を用いた高周波電流測定用ロゴスキーコイルの設計

押川和正, 桑原伸夫, 福本幸弘, 松嶋徹, 脇坂俊幸

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 33 ( 0 ) 11D3 - 2 2019.03

Fukumoto/Matsushima Laboratory, Department of Electrical and Electronic Engineering, School of Engineering, Kyushu Institute of Technology

Fukumoto Yukihiro, Matsushima Tohlu

Journal of The Japan Institute of Electronics Packaging ( The Japan Institute of Electronics Packaging ) 22 ( 7 ) 622 - 622 2019.01

Equivalent-circuit model with retarded electromagnetic coupling for meta-atoms of wired metallic spheres Reviewed

OHISHI Katsuya, HISAKADO Takashi, MATSUSHIMA Tohlu, WADA Osami

IEICE Transactions on Electronics ( The Institute of Electronics, Information and Communication Engineers ) E101C ( 12 ) 923 - 930 2018.12

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

This paper describes the equivalent-circuit model of a metamaterial composed of conducting spheres and wires. This model involves electromagnetic coupling between the conductors, with retardation. The lumped-parameter equivalent circuit, which imports retardation to the electromagnetic coupling, is developed in this paper from Maxwell's equation. Using the equivalent-circuit model, we clarify the relationship between the retardation and radiation loss; we theoretically demonstrate that the electromagnetic retardation in the near-field represents the radiation loss of the meta-atom in the far-field. Furthermore, this paper focuses on the retarded electromagnetic coupling between two meta-atoms; we estimate the changes in the resonant frequencies and the losses due to the distance between the two coupled meta-atoms. It is established that the dependence characteristics are significantly affected by electromagnetic retardation.

DOI： 10.1587/transele.E101.C.923

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Formulation of single-conductor transmission line model with feedback electric fields by terminal discontinuity Reviewed

Tashiro D., Hisakado T., Matsushima T., Wada O.

Asia-Pacific Microwave Conference Proceedings, APMC 2018-November 642 - 644 2018.11

Topological estimation of resonant frequencies by equivalent circuit for star meta-atoms Reviewed

Hasegawa A., Hisakado T., Matsushima T., Wada O.

Asia-Pacific Microwave Conference Proceedings, APMC 2018-November 201 - 203 2018.11

Modal analysis of reflection of TDR in overhead distribution lines Reviewed

Matsushima T., Hisakado T., Wada O., Oe S., Sasaoka T.

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility, EMC/APEMC 2018 523 - 526 2018.06

Validation of prediction method of common-mode current reduction based on imbalance difference model for differential transmission line placed near edge of adjacent ground plane Reviewed

Matsushima Tohlu, Watanabe Tetsushi, Toyota Yoshitaka, Koga Liuji R., Wada Osami

Journal of The Japan Institute of Electronics Packaging ( The Japan Institute of Electronics Packaging ) 21 ( 2 ) 178 - 185 2018.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

The electric asymmetry of a pair of differential transmission lines placed near an adjacent ground edge causes unwanted electromagnetic radiation when the adjacent ground width changes. In this paper, the imbalance difference model which has been proposed by the authors is verified by experiment and full-wave simulation for asymmetric differential transmission lines at different distances from the adjacent ground edge. The difference in secondary-common mode current in terms of the distance from the ground edge coincides with an error of up to 3 dB among the imbalance difference model, measurement, and electromagnetic simulation. Therefore the imbalance difference model has sufficient accuracy for practical use in designing differential transmission lines which produce less undesired emissions.

DOI： 10.5104/jiep.21.178

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85042716629&origin=inward

RF immunity test of CAN FD Transceivers during Data-Frame Communication

Kawanishi K., Matsushima T., Hisakado T., Wada O.

IEEE Electromagnetic Compatibility Magazine 7 ( 1 ) 51 - 55 2018.01

Trends of EMC standards for automotive network devices and communication quality of ethernet in relation to parameters of pulse disturbances

Matsushima S., Matsushima T., Hisakado T., Wada O.

IEEE Electromagnetic Compatibility Magazine 7 ( 1 ) 46 - 50 2018.01

TDR measurement with utility-pole-distance resolution in overhead distribution system Reviewed

Oe Shinpei, Sasaoka Tsuyoshi, Matsushima Tohlu, Hisakado Takashi, Wada Osami

IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan ) 138 ( 9 ) 766 - 771 2018.01

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

It is necessary to detect a fault point in overhead distribution system for failure restoration. To search the fault point effectively and precisely, we apply TDR (Time Domain Reflectometry) measurement with utility-pole-distance resolution. In this method, we inject a pulse wave into distribution lines and measure the reflection. In this paper, the authors confirm propagation characteristics of overhead distribution system and compare the measurement of the reflected wave with the simulation result. Through the experiments, the authors confirm an influence of parasitic capacitances in overhead distribution facilities such as a transformer and a switchgear. When distribution facility is not connected with distribution line, the reflected wave from every utility pole and the end terminal are observed; the reflected waves from every utility pole are caused by parasitic capacitors between the distribution lines and cross arms. When distribution facility such as a transformer and a switchgear is connected with distribution line, the reflected waves caused by these facilities are observed. As a result, we confirmed that parasitic capacitances of distribution facilities affect the propagation characteristics of distribution failure pulse wave. In addition, the authors developed a simulation tool to evaluate the propagation characteristics of the pulse wave in the overhead distribution system based on the result utilizing the test distribution system, and confirmed that the simulation results corresponded to the measurement results.

DOI： 10.1541/ieejpes.138.766

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Analysis of dispersion splitting on light line by characteristic roots of retarded circuit equation Reviewed

Nakata R., Hisakado T., Matsushima T., Wada O.

Progress in Electromagnetics Research Symposium 2017-November 2405 - 2409 2017.11

Comparison of voltage sources with current sources on unbalanced differential microstrip line Reviewed

Saito H., Matsushima T., Hisakado T., Wada O.

2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE 2017, EMC Europe 2017 2017.11

TDR measurement with utility-pole-interval resolution of real-scale distribution system Reviewed

Oe S., Sasaoka T., Matsushima T., Hisakado T., Wada O.

CIRED - Open Access Proceedings Journal 2017 ( 1 ) 1504 - 1507 2017.10

Equivalent circuit model with nonlinear characteristics of zener diode extracted from SPICE model for ESD simulation Reviewed

Matsushima T., Aoki M., Hisakado T., Wada O.

Proceedings of the 2017 11th International Workshop on the Electromagnetic Compatibility of Integrated Circuits, EMCCompo 2017 152 - 155 2017.07

Equivalent-circuit model for meta-atoms consisting of wired metallic spheres Reviewed

HISAKADO Takashi, YOSHIDA Keisuke, MATSUSHIMA Tohlu, WADA Osami

IEICE Transactions on Electronics ( The Institute of Electronics, Information and Communication Engineers ) E100C ( 3 ) 305 - 312 2017.03

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

An equivalent-circuit model is an effective tool for the analysis and design of metamaterials. This paper describes a systematic and theoretical method for the circuit modeling of meta-atoms. We focus on the structures of wired metallic spheres and propose a method for deriving a sophisticated equivalent circuit that has the same topology as the wires using the partial element equivalent circuit (PEEC) method. Our model contains the effect of external electromagnetic coupling: excitation by an external field modeled by voltage sources and radiation modeled by the radiation resistances for each mode. The equivalent-circuit model provides the characteristics of meta-atoms such as the resonant frequencies and the resonant modes induced by the current distribution in the wires by an external excitation. Although the model is obtained by a very coarse discretization, it provides a good agreement with an electromagnetic simulation.

DOI： 10.1587/transele.E100.C.305

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85015997349&origin=inward

Packet Error Rate Analysis Considering Collision Probability between Pulse Disturbance and Transmission Packets Reviewed

TAKAYA Kazuhiro, TOMITA Daisuke, UMEDA Kouki, OGAWA Masakatsu, MATSUSHIMA Tohlu, HISAKADO Takashi, WADA Osami

J100-B ( 3 ) 166 - 175 2017.03

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

According to the advent of Internet of Things (IoT) era and the 5th Generation concept, the network access control method, which is convenient for choosing appropriate communication system and communication parameters, has been required as to communication environment or network applications. For choosing the appropriate system and the parameters, it is important to estimate the communication quality, which depends on communication environment. Disturbance becomes one of the factors for determining the communication environment, and some methods have been proposed for estimating the communication quality for the communication environment with various disturbances, with applying such as Amplitude Probability Distribution (APD) or Signal to Interference Ratio (SIR), which are strongly correlated to communication quality deterioration of digital radio communication systems. However APD couldn't consider pulse duration or interval between each pulse disturbance although almost all the artificial disturbance may be the pulse disturbance. Additionally, SIR couldn't show its efficiency when we estimate the communication quality in the communication environment where a number of disturbance sources exist and the power of each pulse disturbance is different. This paper proposes Packet Error Rare (PER) analysis method that takes the collision probability between pulse disturbance and transmission packets in the communication environment with various pulse disturbances whose pulse duration, interval between each pulse disturbance, and power are different. Furthermore, parameters of the disturbance for estimating PER are considered with using case study.

DOI： 10.14923/transcomj.2016pep0008

Experimental evaluation of communication quality of Ethernet in relation to parameters of pulse disturbances Reviewed

Matsushima Sayaka, Matsushima Tohlu, Hisakado Takashi, Wada Osami

IEICE Communications Express ( The Institute of Electronics, Information and Communication Engineers ) 6 ( 12 ) 639 - 644 2017.01

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

In this paper, in order to improve the reliability of Ethernet communication, the effect of pulse disturbances on the communication quality of 100BASE-TX was evaluated experimentally. A relationship between the threshold level of Ethernet and disturbances affecting communication quality was revealed when the amplitude and width of the pulse disturbance were changed. A disturbance in which the pulse width was the same as 1 bit time of the signal degraded the communication quality the most. These findings should help in the effort to apply Ethernet to automotive area network.

DOI： 10.1587/comex.2017XBL0116

Other Link： https://ci.nii.ac.jp/naid/130006236019

Position of Parasitic Capacitance around DCDC Converter for Reduction of Common-mode Current Reviewed

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 31 ( 0 ) 320 - 321 2017.01

Time domain model for reaction of radiation on thin cut wires Reviewed

Kimura T., Hisakado T., Matsushima T., Wada O.

2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2016 181 - 183 2016.11

Immunity macro model for linear regulator considering internal terminal voltage Reviewed

Matsushima T., Miyahara H., Hisakado T., Wada O.

IEEE International Symposium on Electromagnetic Compatibility 2016-November 532 - 535 2016.11

B-4-71 LCL Evaluation Based on S-parameter Measurements

Matsushima Tohlu, Takaya Kazuhio, Okugawa Yuichiro, Sugiura Akira, Wada Osami

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 391 2016.03

C-1-7 Theoretical expression of external excitation on single conductor line Reviewed

Kimura Takuya, Hisakado Takashi, Matsushima Tohlu, Wada Osami

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 7 2016.03

C-2-28 Expression of Electromagnetic Coupling with Retardation in Lumped Element Circuit Model Reviewed

Ohishi Katsuya, Hisakado Takashi, Matsushima Tohlu, Wada Osami

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 57 2016.03

Immunity Macro Model of LDO Voltage Regulator by Measurement of Large Signal S Parameter Reviewed

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 30 ( 0 ) 338 - 340 2016.01

Reduction method of common-mode noise on power supply cable using floating conductor Reviewed

2015.12

Relation between internal terminal voltage and immunity behavior of LDO regulator circuits Reviewed

143 - 146 2015.12

Mode conversion and transfer characteristics of conducted disturbance to Ethernet device from power supply cable Reviewed

2015-Septmber 378 - 381 2015.09

Reduction method of common mode in high speed differential transmission line

Matsushima T.

Journal of Japan Institute of Electronics Packaging ( Journal of Japan Institute of Electronics Packaging ) 18 ( 5 ) 348 - 352 2015.01

Impedance balance control for reduction of common mode noise in full bridge converter Reviewed

695 - 699 2015.01

Power and ground phase relation in LSI power distribution network at common-mode noise reduction Reviewed

2014-December 561 - 564 2014.01

Imbalance control by open stub for reduction of common-mode conversion at differential transmission line bend Reviewed

2014-December 125 - 128 2014.01

Reduction of common-mode excitation on a differential transmission line bend by imbalance control Reviewed

Matsushima Tohlu, Wada Osami

IEICE Communications Express 3 ( 10 ) 295 - 299 2014.01

A method of common-mode reduction based on imbalance difference model for differential transmission line bend Reviewed

338 - 341 2013.12

Imbalance Control for Reduction of Common-Mode Generation at Differential Transmission Line Bend Reviewed

MATSUSHIMA Tohlu, WADA Osami

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 113 ( 101 ) 5 - 10 2013.06

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

A differential transmission line bend generates a large common mode due to its asymmetry, and it leads signal integrity problems. In this paper, the imbalance difference model, which was proposed by the authors for estimation of common-mode radiation, is extended to apply to the differential signaling systems. An equivalent circuit model based on the imbalance difference model is proposed for estimation of the common-mode excitation at the transmission line bend. Simulation results of mode conversion from the differential mode to the common mode calculated by the proposed model are in good agreement with those using a three-dimensional electromagnetic solver. In order to reduce the common mode, a guard trace is added near the narrowed inner signal line at the line bend and it gives 15 dB of reduction of the common mode. In addition, an open stub which is connected inner signal line at the line bend can control the imbalance. More than 20 dB of reduction is obtained by the narrow signal line and the open stub.