start-ver=1.4
cd-journal=joma
no-vol=36
cd-vols=
no-issue=2
article-no=
start-page=83
end-page=89
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=200203
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Experimental Verification of Common-Mode Excitation Model for PCB Having Partially Narrow Return Path
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Suppression of common-mode current is important to achieve electromagnetic compatibility of high-speed and high-density electronic circuits. The authors have focused on the common mode current flowing on a printed circuit board (PCB) to explain the excitation mechanism. A narrow ground pattern in microstrip structure excites common-mode current. In the previous paper, the authors explained the mechanism of common mode generation by means of "current division factor" for simple PCBs. The estimated radiation from a simple PCB agreed well with measured one. In this paper, the authors extend the theory to be applied to generalize ground structure. The validity of the theory is confirmed by comparing the measured radiation and the estimated value using the common-mode model for a test PCB. The estimated radiation agrees well with the measured one within 3 dB up to 900 MHz.
en-copyright=
kn-copyright=
en-aut-name=WatanabeTetsushi
en-aut-sei=Watanabe
en-aut-mei=Tetsushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=MiyashitaTakuya
en-aut-sei=Miyashita
en-aut-mei=Takuya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Natural Science and Technology Okayama University
affil-num=2
en-affil=
kn-affil=Graduate School of Natural Science and Technology Okayama University
affil-num=3
en-affil=
kn-affil=Graduate School of Natural Science and Technology Okayama University
affil-num=4
en-affil=
kn-affil=Department of Communication Network Engineering Okayama University
affil-num=5
en-affil=
kn-affil=Computer Center Okayama University
END
start-ver=1.4
cd-journal=joma
no-vol=36
cd-vols=
no-issue=2
article-no=
start-page=73
end-page=82
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=200203
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Application of Transfer Matrix Method with Signal Flow-Chart to Analyze Optical Multi-Path Ring-Resonator
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A multi-path ring-resonator (MPRR) was proposed to extend FSR of ring resonator. However, it is complicated to analyze the MPRR by using well-known analysis techniques such as scattering matrix or other numerical methods. This paper describes procedure for deriving transfer matrix by means of signal flow-chart to analyze the MPRR. We do not need complicated calculation for steady state analysis because transfer matrix elements are formulated clearly. As a result, The calcultaion time in this method can be reduced 1/3 to 1/20 times compared with using scattering matirx method. Furthermore, a transmittance characteristics of the MPRR at FSR extension-factor of 10 will also be shown. This suggests that analysis of other types of the MPRR by using this method can be performed simply and take a shorter time.
en-copyright=
kn-copyright=
en-aut-name=HidayatIip Syarif
en-aut-sei=Hidayat
en-aut-mei=Iip Syarif
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=TorigoeOsamu
en-aut-sei=Torigoe
en-aut-mei=Osamu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=2
en-affil=
kn-affil=Departement of Communication Network Engineering, Okayama University
affil-num=3
en-affil=
kn-affil=Departement of Electrical and Electronic Engineering, Okayama University
affil-num=4
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=5
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
END
start-ver=1.4
cd-journal=joma
no-vol=37
cd-vols=
no-issue=2
article-no=
start-page=89
end-page=97
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2003
dt-pub=200303
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Aerosol Extinction Coefficient Continuously Measured with Polarized Mie Scattering Lidar
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Aerosol extinction coefficients of clouds and dust were continuously measured in the year of 2002 with a polarized Mie-scattering lidar controlled by an automatic and remotely operating system utilizing internet services. Measured cloud extinctions were greater than 1.0 km(-1) below the altitude 6 km, 0.17 - 1.0 km(-1) between 6 and 10 km, and 0.091 - 0.3 km(-1) beyond 10km. Extinction of dust were 0.10 and 0.20 km(-1) for Asian dust and 0.057 km(-1) for urban dust.
en-copyright=
kn-copyright=
en-aut-name=IokibeKengo
en-aut-sei=Iokibe
en-aut-mei=Kengo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=2
en-affil=
kn-affil=Departement of Communication Network Engineering, Okayama University
affil-num=3
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=4
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
END
start-ver=1.4
cd-journal=joma
no-vol=37
cd-vols=
no-issue=1
article-no=
start-page=51
end-page=60
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=200211
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Pulse Timing Control of Multiple Signal Interconnections for Reduction of EMI
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=This paper presents pulse timing control method to reduce electromagnetic emission from multiple signal interconnections. Pulse timing control gives intentional skew between signals. Higher order harmonics are canceled because of the difference of the phase between the signals. Using this property, pulse timing control can reduce the EMI in wide frequency range. In this paper, we show that radiated electromagnetic field from multiple signal lines reduces its intensity to the same level of the field from one line by using pulse timing control. The result of measurement
shows that EMI from four differential transmission lines can be reduced more than 9 dB in the 200 MHz to 800 MHz frequency range.
en-copyright=
kn-copyright=
en-aut-name=NambaAkihiro
en-aut-sei=Namba
en-aut-mei=Akihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=2
en-affil=
kn-affil=Departement of Communication Network Engineering, Okayama University
affil-num=3
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=4
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
END
start-ver=1.4
cd-journal=joma
no-vol=47
cd-vols=
no-issue=1
article-no=
start-page=2
end-page=9
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=20052
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Convergence acceleration and accuracy improvement in power bus impedance calculation with a fast algorithm using cavity modes
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Based on the cavity-mode model, we have developed a fast algorithm for calculating power bus impedance in multilayer printed circuit boards. The fast algorithm is based on a closed-form expression for the impedance Z matrix of a rectangular power bus structure; this expression was obtained by reducing the original double infinite series into a single infinite series under an approximation. The convergence of the single series is further accelerated analytically. The accelerated single summation enables much faster computation, since use of only a few terms is enough to obtain good accuracy. In addition, we propose two ways to compensate for the error due to the approximation involved in the process of reducing the double series to the single series, and have demonstrated that these two techniques are almost equivalent.
en-copyright=
kn-copyright=
en-aut-name=WangZhi Liang
en-aut-sei=Wang
en-aut-mei=Zhi Liang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Okayama University
affil-num=2
en-affil=
kn-affil=Okayama University
affil-num=3
en-affil=
kn-affil=Okayama University
affil-num=4
en-affil=
kn-affil=Okayama University
en-keyword=Cavity-mode model
kn-keyword=Cavity-mode model
en-keyword=closed-form expression for fast calculation
kn-keyword=closed-form expression for fast calculation
en-keyword=power bus impedance
kn-keyword=power bus impedance
en-keyword=power bus
kn-keyword=power bus
en-keyword=resonance
kn-keyword=resonance
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=73
end-page=76
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2003
dt-pub=200311
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Analysis of resonance characteristics of a power bus with rectangle and triangle elements in multilayer PCBs
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=One of the major sources 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 consists of several segments of rectangles and/or right-angled triangles. Good agreement between the calculated and measured results demonstrates the usefulness and accuracy of the fast algorithm and the segmentation method.
en-copyright=
kn-copyright=
en-aut-name=WangZhi Liang
en-aut-sei=Wang
en-aut-mei=Zhi Liang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=古賀隆治
kn-aut-sei=古賀
kn-aut-mei=隆治
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Okayama University
affil-num=2
en-affil=
kn-affil=Okayama University
affil-num=3
en-affil=
kn-affil=Okayama University
affil-num=4
en-affil=
kn-affil=Okayama University
en-keyword=S-matrix theory
kn-keyword=S-matrix theory
en-keyword=electromagnetic interference
kn-keyword=electromagnetic interference
en-keyword=impedance matrix
kn-keyword=impedance matrix
en-keyword=printed circuits
kn-keyword=printed circuits
en-keyword=resonance
kn-keyword=resonance
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=775
end-page=778
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=20025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Application of segmentation method to analysis of power/ground plane resonance in multilayer PCBs
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The fast algorithm developed for calculating the resonant characteristics of the power/ground planes in multilayer PCBs, is extended to the case of that the pattern of the power/ground planes consists of several "segments" of rectangles, using the so-called segmentation method. Good agreements between the calculated and measured results have demonstrated the usefulness and accuracy of our fast algorithm and the segmentation method.
en-copyright=
kn-copyright=
en-aut-name=WangZhi Liang
en-aut-sei=Wang
en-aut-mei=Zhi Liang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=古賀隆治
kn-aut-sei=古賀
kn-aut-mei=隆治
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Okayama University
affil-num=2
en-affil=
kn-affil=Okayama University
affil-num=3
en-affil=
kn-affil=Okayama University
affil-num=4
en-affil=
kn-affil=Okayama University
en-keyword=circuit resonance
kn-keyword=circuit resonance
en-keyword=electromagnetic interference
kn-keyword=electromagnetic interference
en-keyword=printed circuit design
kn-keyword=printed circuit design
END
start-ver=1.4
cd-journal=joma
no-vol=34
cd-vols=
no-issue=1-2
article-no=
start-page=27
end-page=37
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2000
dt-pub=20000327
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Depolarization properties of Asian dust (KOSA) measured hyLIDAR in Okayama in the spring of 1998
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In spring of 1998, Asian dust was observed with a Mie LIDAR in Okayama University, which can measure depolarization ratio. Three events of intense Asian dust were occurred in the period and medially detailed structure of atmosphere was found after examining records. Asian dust was distinguished from water droplets and the possibility to study three dimensional dynamic structure of atmosphere were demonstrated.
en-copyright=
kn-copyright=
en-aut-name=WeiHe
en-aut-sei=Wei
en-aut-mei=He
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=古賀隆治
kn-aut-sei=古賀
kn-aut-mei=隆治
aut-affil-num=2
ORCID=
en-aut-name=IokibeKengo
en-aut-sei=Iokibe
en-aut-mei=Kengo
kn-aut-name=五百旗頭健吾
kn-aut-sei=五百旗頭
kn-aut-mei=健吾
aut-affil-num=3
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=和田修己
kn-aut-sei=和田
kn-aut-mei=修己
aut-affil-num=4
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=豊田啓孝
kn-aut-sei=豊田
kn-aut-mei=啓孝
aut-affil-num=5
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate school of natural science and technology
affil-num=2
en-affil=
kn-affil=Department of Electrical and Electronic Engineering
affil-num=3
en-affil=
kn-affil=Graduate school of natural science and technology
affil-num=4
en-affil=
kn-affil=Department of Electrical and Electronic Engineering
affil-num=5
en-affil=
kn-affil=Department of Electrical and Electronic Engineering
en-keyword=Mie lidar
kn-keyword=Mie lidar
en-keyword=Asian dust (KOSA)
kn-keyword=Asian dust (KOSA)
en-keyword=depolarization ratio
kn-keyword=depolarization ratio
en-keyword=backscattering ratio
kn-keyword=backscattering ratio
en-keyword=range normalized
kn-keyword=range normalized
END
start-ver=1.4
cd-journal=joma
no-vol=39
cd-vols=
no-issue=1
article-no=
start-page=93
end-page=101
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=200501
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A Scheme to Classify Clouds with the Depolarization Ratio andBackscattering Coeffcient Measured by Lidar
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The optical properties of clouds were measured with a polarization Mie lidar during April, 2004 and investigated to categorize the particles detected by the lidar. The cloud
layers were categorized into five types according to the depolarization ratios, as follows: (I) constant and small (less than 5%); increasing with height (II) nearly from 0% and (III) from about 50%; (IV) large and varying with the backscattering coefficient; and (V) sharply decreasing. This categorization of clouds enabled us to separate aerosols from clouds in a lidar signal. Comparison of the backscattering coefficients between clouds of types (I) and
(II) suggested that the depolarization ratio induced by multiple scattering in dense clouds does not depend on the particle density. Estimation of the particle phase for the five cloud categories was also examined.
en-copyright=
kn-copyright=
en-aut-name=IokibeKengo
en-aut-sei=Iokibe
en-aut-mei=Kengo
kn-aut-name=五百旗頭健吾
kn-aut-sei=五百旗頭
kn-aut-mei=健吾
aut-affil-num=1
ORCID=
en-aut-name=ToyotaYoshitaka
en-aut-sei=Toyota
en-aut-mei=Yoshitaka
kn-aut-name=豊田啓孝
kn-aut-sei=豊田
kn-aut-mei=啓孝
aut-affil-num=2
ORCID=
en-aut-name=WadaOsami
en-aut-sei=Wada
en-aut-mei=Osami
kn-aut-name=和田修己
kn-aut-sei=和田
kn-aut-mei=修己
aut-affil-num=3
ORCID=
en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=古賀隆治
kn-aut-sei=古賀
kn-aut-mei=隆治
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=2
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=3
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
affil-num=4
en-affil=
kn-affil=Graduate School of Natural Science and Technology, Okayama University
END