研究者詳細 - 豊田　啓孝

論文 - 豊田　啓孝

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Stopband prediction with dispersion diagram for electromagnetic bandgap structures in printed circuit boards 査読

Yoshitaka Toyota, Arif Ege Engin, Tae Hong Kim, Madhavan Swaminathan, Kazuhide Uriu

2006 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1-3, PROCEEDINGS 807 - 811 2006年

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）出版者・発行元：IEEE

Electromagnetic bandgap (EBG) structures that prevent propagation of electromagnetic waves within a given frequency range are quite effective in suppressing simultaneous switching noise on parallel power planes. However, it is quite time consuming to compute the stopband frequencies of interest using full-wave electromagnetic simulation of the entire structure. In contrast, using dispersion-diagram analysis based on a unit-cell network of EBG structures is more efficient and less time consuming. This paper presents an approach for two-dimensional EBG structures by extending a well-known dispersion-diagram analysis of one-dimensional infinite periodic structures. The stopbands predicted with the proposed analysis were compared with good agreement to measured and simulated results. In addition, the concept was applied to test the stopband range of EBG structures formed on an actual printed circuit board with a test coupon of an EBG unit cell placed on the same board.

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Translation of the electromagnetic mode-splitting along a microstrip line with a slit in the ground plane 査読

Ryuji Koga, Tohlu Matsushima, Tetsushi Watanabe, Youhei Sakai, Osami Wada, Kengo Iokibe, Yoshitaka Toyota

CEEM' 2006: ASIA-PACIFIC CONFERENCE ON ENVIRONMENTAL ELECTROMAGNETICS, VOLS 1 AND 2, PROCEEDINGS 15 - + 2006年

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）出版者・発行元：IEEE

Is proposed an approach to know magnitudes of parasitic electromagnetic modes excited by the micro-strip line passing over a slit in the return plane. A part of the power having been carried along, the microstrip-line is transferred to the coplanar-line modes along the slot, and the cylindrical. mode in between the pair of re. turn and ground planes. Magnitudes of those modes are expressed by the ratio of powers of the excited electromagnetic mode to the original microstrip line mode, discarding information of phase. Calculation was done with FDTD in the limited domain., around the cross-point in a moderate time of calculation. This approach contributes to the efficient designing of PCB of commercial electronic devices.

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Excitation of electromagnetic modes by a signal transmission line overpassing a slit of return plane

Tohlu Matsushima, Youhei Sakai, Kengo Iokibe, Yoshitaka Toyota, Ryuji Koga, Tetsushi Watanabe, Osami Wada

Progress in Electromagnetics Research Symposium 92 - 95 2006年

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）出版者・発行元：Electromagnetics Academy

Printed circuit boards (PCBs) sometimes have a separated power or ground plane. Differential mode having been propagated along the microstrip line is divided into multiple modes when the differential mode arrives at the intersection of the signal line and the slit. They are differential mode that reflects backward and runs through, slot line mode and parallel plane mode. In order to evaluate excitation of undesirable electromagnetic modes, "transmission factor" is defined as a power ratio of excited mode to incident mode and is expressed in a matrix form like S matrix. The transmission factor is obtained by the electromagnetic calculation near the slit, since it is determined only by the structure of the intersection between the signal line and the slit.

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Finite difference modeling of multiple planes in packages

A. Ege Engin, Madhavan Swaminathan, Yoshitaka Toyota

17th International Zurich Symposium on Electromagnetic Compatibility, 2006 2006 549 - 552 2006年

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）出版者・発行元：IEEE Computer Society

Power/ground planes in electronic packaging can be a major factor for noise coupling. There can be noise coupling not only in the transversal direction between two planes, but also vertically from one plane pair to another through the apertures and via holes. Due to the large size of the power/ground planes, it is difficult to analyze them using full-wave simulators. It is known that the finite difference solution of the Helmholtz equation provides a faster approach with a comparable accuracy. This paper presents new circuit models for a single plane pair based on the finite difference method: T- and X-Models. It also presents a modeling approach for multiple plane pairs that are coupled through apertures.

DOI： 10.1109/emczur.2006.214993

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Analysis and design of electromagnetic bandgap (EBG) structures for power plane isolation using 2D dispersion diagrams and scalability

A. Ege Engin, Yoshitaka Toyota, Tae Hong Kim, Madhavan Swaminathan

Proceedings - 10th IEEE Workshop on Signal Propagation on Interconnects, SPI 2006 79 - 82 2006年

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）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Simultaneous switching noise (SSN) is one of the major bottlenecks for successful design of high-performance systems. Especially mixed-signal designs are very sensitive to SSN due to the low voltage levels applied in analog circuits. One way of isolation is by placing the digital and analog domains far from each other. Even then, the power planes can transfer noise voltages both vertically and horizontally through out the board and total board area is a major concern in microminiaturized convergent systems. Electromagnetic bandgap structures (EBG) have been successfully applied for such isolation. Although any periodical shape can be used for isolation, only a few shapes have been reported, with various analysis methods. We present a new EBG with narrow slits, which shows a higher attenuation constant compared with existing structures. We also present a new analysis methodology for 2D EBG structures. Finally, a method to scale such EBG structures for different stopband requirements is introduced. ©2006 IEEE.

DOI： 10.1109/SPI.2006.289196

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Modeling of gapped power bus structures for isolation using cavity modes and segmentation 査読

ZL Wang, S Wada, Y Toyota, R Koga

IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 47 ( 2 ) 210 - 218 2005年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Resonance characteristics of gapped power bus structures with a slit or a gap were studied, using a fast algorithm based on a full cavity-mode resonator model and the segmentation method. Inductance and capacitance models were used to account for a field coupling along the slit and across the gap, respectively. The effectiveness of the segmentation method and the inductance model for the slit has been demonstrated by good agreement between the calculated and measured results, while the capacitance model for the gap is shown to be useful when the coupling between the segments is relatively weak.

DOI： 10.1109/TEMC.2005.847414

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Power current modeling of IC/LSI with load dependency for EMI simulation 査読

H Osaka, T Kinoshita, D Tanaka, O Wada, Y Toyota, R Koga

2003 IEEE SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, SYMPOSIUM RECORD, VOLS 1 AND 2 16 - 21 2003年

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）出版者・発行元：IEEE

In this paper, we describe how we modeled EMI noise from the power-pin current of an LSI that has two ports: a power-ground port and a driver output port. We named this modeling the "Linear Equivalent Circuit and Current Source for I/O (LECCS-I/O)" model and with it measured power current and power-ground impedance for various combinations of loading capacitances and decoupling inductances using a small scale IC (74LVC04). Results showed that up to 500 MHz, the LECCS-I/O model could predict peak and valley frequencies of the power current where the error was within 2.5 MHz, and where the peak current error was less than 5 dB. The application range of the LECCS-I/O model is valid where the non-overlap duration of the dumping oscillation wave between cycles is longer than twice the time constant of the waveform.

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High-speed common-mode prediction method for PCBs having a signal line close to the ground edge 査読

T Watanabe, H Fujihara, O Wada, A Namba, Y Toyota, R Koga

2003 IEEE SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, SYMPOSIUM RECORD, VOLS 1 AND 2 28 - 33 2003年

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）出版者・発行元：IEEE

Evaluation of common-mode excitation is important to efficiently reduce the EMI radiated from printed circuit boards (PCBs). We have focused on the excitation mechanisms of the common-mode current flowing on a PCB. In a previous paper, we explained a mechanism of common-mode excitation in terms of the current division factor, which expresses the degree of imbalance of a transmission line. The calculation is two-dimensional so the evaluation time is much shorter than that of FDTD or other 3D fullwave simulations. The calculated reduction of common-mode radiation from simple PCBs agreed well with the measured value. In this paper, to demonstrate the effectiveness of this approach, we apply it to various PCBs, such as one that has a signal trace close to a board edge or one with guard bands, and evaluate the effectiveness of the common-mode reduction. Our calculated and experimental results are in good agreement.

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Analysis of resonance characteristics of a power bus with rectangle and triangle elements in multilayer PCBs 査読

ZL Wang, O Wada, Y Toyota, R Koga

ASIA-PACIFIC CONFERENCE ON ENVIRONMENTAL ELECTROMAGNETICS, CEEM'2003, PROCEEDINGS 73 - 76 2003年

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）出版者・発行元：PUBLISHING HOUSE BEIJING UNIV POSTS & TELECOMMUNICATIONS

One of the major source of radiated EMI is attributed to power bus resonance in a printed circuit board(PCB). A fast algorithm, combined with the segmentation method, is applied for calculating resonance characteristics of a power bus whose pattern consisting of several segments of rectangles and/or right-angled triangles. Good agreements between the calculated and measured results demonstrate the usefulness and accuracy of the fast algorithm and the segmentation method.

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Stable inversion method for a polarized-lidar: Analysis and simulation 査読

He Wei, Ryuji Koga, Kengo Iokibe, Osami Wada, Yoshitaka Toyota

Journal of the Optical Society of America A: Optics and Image Science, and Vision 18 ( 2 ) 392 - 398 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）

A new inversion inhomogeneous atmosphere (IA) method that is more stable than Fernald’s method for two-component (molecule and aerosol) scattering analysis of polarized Mie lidar signals is proposed and examined. The backscattering coefficient and the extinction-to-backscattering ratio (EBR) can be calculated for specified regions at which the depolarization ratio is less than that of molecule without further assumptions. The inversion procedure can be extended to both inward stepwise and outward stepwise integration algorithms. Simulation results indicate that a higher precision was achieved with the IA method than with Fernald’s method in terms of error and random noise in estimating boundary value and EBR. Experimental results were also better with the IA method than with Fernald’s method. © 2001 Optical Society of America.

DOI： 10.1364/JOSAA.18.000392

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微細周期構造にイオン注入したときの素子帯電のシミュレーション

酒井滋樹, 辻博司, 後藤康仁, 豊田啓孝, 石川順三, 丹上正安, 松田耕自

真空 38 ( 3 ) 228 - 230 1995年3月

高周波プラズマスパッタ型負重イオン源における気体材料の負イオン生成

辻博司, 岡山芳央, 豊田啓孝, 後藤康仁, 石川順三

真空 38 ( 3 ) 218 - 220 1995年3月

Special Number/Negative-Ion Beam Technology and Its Application to Materials Science. Surface Potential Measurement of Negative-Ion-Implanted Insulators by Analysing Secondary Electron Energy Distribution. 査読

豊田啓孝, 辻博司, 南雲正二, 酒井滋樹, 後藤康仁, 石川順三

Ionics 20 ( 1 ) 71 - 76 1994年1月

Special Number/Negative-Ion Beam Technology and Its Application to Materials Science. Surface Potential Measurement of Insulated Electrode by Negative-Ion Implantation. 査読

辻博司, 酒井滋樹, 豊田啓孝, 岡山芳央, 後藤康仁, 石川順三

Ionics 20 ( 1 ) 57 - 64 1994年1月

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