| Project/Area Number |
09650369
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Kanazawa Institute of Technology |
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Principal Investigator |
YAMAGUCHI Takashi Kanazawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80064476)
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| Co-Investigator(Kenkyū-buntansha) |
OKUMURA Yoshihisa Kanazawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (30139745)
MIZUSAWA Motoo Kanazawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (20199996)
HAYASHI Takahiro Kanazawa Technical College, Department of Electrical Engineering, Lecturer, 電気工学科, 講師 (90241223)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Electromagnetic Shielding / Shielding Effectiveness / Shielding Plate / Near-field Shielding / Far-field Shielding / Measurement of Shielding |
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| Research Abstract |
The main results of this investigation were as follows.
1. We proposed on the unified expression for the electromagnetic shielding effectiveness SE. Near-field SE is closely related with a type and a position or an arrangement of electromagnetic source and observation point. But, far-field SE which is the SE of an infinite shielding plate for plane wave, is not concerned with them. Therefore, it is adequate that the unified expression for SE should be adopted the far-field SE.
2. There needs a large space for the measurements of far-field SE, but dose not for the measurements of near-field SE. Therefore, the measurements are desirable for near-field SE. We derived the approximate conversion formula of the near-field SE and the far-field SE, then we estimated the area size of a shielding plate by theoretical and numerical analysis. They were verified by the experiments and the measurements. As a result, it is shown that the far-field SE can be estimated by the near-field SE measurements of small-sized circular shielding plates less than several ten-centimeter radiuses, and the space of measurement system can be less than 1m^3 volume.
3. As a part of the trial for small-sized measurement space without an anechoic room, we propose on the equipment which is consisted of a wave source, a sample plate and a receiving element within a metallic circular cylinder. We derived the approximate conversion formula of the near-field SE and the far-field SE in this case.
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