| Project/Area Number |
09450155
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
情報通信工学
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| Research Institution | Kyushu University |
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Principal Investigator |
YASUMOTO Kiyotoshi Kyushu University, Graduate School of Information Science and Electrical Engineering, Professor, 大学院・システム情報科学研究科, 教授 (60037926)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Koki Kyushu University, Graduate School of Information Science and Electrical Engineering, Research Associate, 大学院・システム情報科学研究科, 助手 (20294902)
YOSHITOMI Kuniaki Kyushu University, Graduate School of Information Science and Electrical Engineering, Associate Professor, 大学院・システム情報科学研究科, 助教授 (30150501)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1997: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Multiconductor lines / Coupled-mode theory / Microwave devices |
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| Research Abstract |
The purpose of this research project is to investigate a modeling of microwave devices using the full-wave coupled-mode theory for multilayered and multiconductor transmission lines. The main results of the research are summarized as follows :
1. Using the coupled-mode theory based on the reciprocity theorem, novel transmission-line equations have been proposed for multilayered and multiconductor lines. The formula to calculate the circuit parameters of multiport coupled-microstrip line systems has been presented using the proposed transmission-line equations. The circuit parameters in various coupled-microstrip line structures were evaluated and the validity of the formula was confirmed.
2. The coupled-mode equations in the time domain has been presented for analyzing the resonance frequencies of coupled microstrip resonators. The equations have been applied to study the resonance characteristics in two-coupled microstrip resonators with arbitrary orientation.
3. The coupled-mode theory for multiconductor transmission lines on a substrate of magnetized ferrite has been presented, using the generalized reciprocity relation and the properties of symmetry for the guided fields in an anisotropic medium. The resulting coupled-mode equations have the same form as those obtained for the multiconductor lines on a dielectric substrate. The equations have been applied to analyze the nonreciprocal properties of two-coupled microstrip lines on the magnetized ferrite substrate.
4. A novel coupled-mode formation applicable to coupled dielectric waveguides with a large refractive-index difference between core and cladding regions has been presented. The formulation was used to analyze the coupling characteristics of an NRD-guides coupler.
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