Some recent results from research conducted in the EMC group at Okayama University are reviewed. A scheme for power-bus modeling with an analytical method is introduced. A linear macro-model for ICs/LSIs, called the LECCS model, has been developed for EMI and EMS simulation. This model has a very simple structure and is sufficiently accurate. Combining the LECCS model with analytical simulation techniques for power-bus resonance simulation provides a method for high-speed EMI simulation and decoupling evaluation related to PCB and LSI design. A useful explanation of the common-mode excitation mechanism, which utilizes the imbalance factor of a transmission line, is also presented. Some of the results were investigated by implementing prototypes of a high-speed EMI simulator, HISES.
en-copyright= kn-copyright= en-aut-name=WadaOsami en-aut-sei=Wada en-aut-mei=Osami kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= 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=2 ORCID= en-aut-name=WatanabeTetsushi en-aut-sei=Watanabe en-aut-mei=Tetsushi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=FukumotoYukihiro en-aut-sei=Fukumoto en-aut-mei=Yukihiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=ShibataOsamu en-aut-sei=Shibata en-aut-mei=Osamu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=TakahashiEiji en-aut-sei=Takahashi en-aut-mei=Eiji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=OsakaHideki en-aut-sei=Osaka en-aut-mei=Hideki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MatsunagaShigeki en-aut-sei=Matsunaga en-aut-mei=Shigeki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 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=9 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=Industrial Technology Center of Okayama Prefecture affil-num=4 en-affil= kn-affil=Matsushita Electric Industrial Coporation Limited affil-num=5 en-affil= kn-affil=Matsushita Electric Industrial Coporation Limited affil-num=6 en-affil= kn-affil=Matsushita Electric Industrial Coporation Limited affil-num=7 en-affil= kn-affil=Hitachi Limited affil-num=8 en-affil= kn-affil=Okayama University affil-num=9 en-affil= kn-affil=Okayama University en-keyword=printed circuit board kn-keyword=printed circuit board en-keyword=modeling kn-keyword=modeling en-keyword=power-bus resonance kn-keyword=power-bus resonance en-keyword=device kn-keyword=device en-keyword=model kn-keyword=model en-keyword=common mode kn-keyword=common mode en-keyword=imbalance kn-keyword=imbalance en-keyword=EMI simulator kn-keyword=EMI simulator en-keyword=HISES kn-keyword=HISES END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue= article-no= start-page=10 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20038 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Modeling of gapped power bus structures for isolation using cavity modes en-subtitle= kn-subtitle= en-abstract= kn-abstract=Power bus resonance characteristics of a gapped power-plane with a slit and a split power-plane with 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. Good agreements between the calculated and measured results were found to demonstrate the effectiveness and accuracy of our fast algorithm and the segmentation method, as well as the inductance model for the slit and the capacitance model for the gap.
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=KogaRyuji en-aut-sei=Koga en-aut-mei=Ryuji kn-aut-name=ŒÃ‰ê—²Ž¡ kn-aut-sei=ŒÃ‰ê kn-aut-mei=—²Ž¡ aut-affil-num=3 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 en-keyword=cavity resonators kn-keyword=cavity resonators en-keyword=printed circuit design kn-keyword=printed circuit design 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=ŒÃ‰ê—²Ž¡ kn-aut-sei=ŒÃ‰ê kn-aut-mei=—²Ž¡ 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=ŒÃ‰ê—²Ž¡ kn-aut-sei=ŒÃ‰ê kn-aut-mei=—²Ž¡ 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