| Project/Area Number |
13650395
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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 |
情報通信工学
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
UNO Toru Tokyo University of Agriculture and Technology, Electrical and Electronic Engineering, Associate Professor, 工学部, 教授 (80176718)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Masaharu Tokyo University of Agriculture and Technology, Electrical and Electronic Engineering, Associate Professor, 工学部, 助教授 (70267342)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Electromagnetic Radiation / Printed Circuit Board / FDTD Method / MUSIC Algorithm / Spherical Wave / Imaging Method / 不要放射電磁波 / 電磁波 / 物理光学近似 / 指向性 / アンテナ / 電磁放射源 |
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| Research Abstract |
The undesirable electromagnetic radiation occurs from a printed circuit board (PCB) or power lines which compose an electric equipments. One of the purposes of this study is to analyze the electromagnetic radiation from the PCB quite rigorously, and to estimate the position of the undesirable radiation. The PCB consists of the transmission line conductors, passive elements, active elements and so on. The electromagnetic radiation comes from the transmission lines mainly because the transmission line works as the antenna conductor. In order to estimate the undesirable radiation, the analysis in time domain would be very effective because the physical phenomena are able to catch easily. In this viewpoint, the Finite Difference Time Domain (FDTD) method is die most useful electromagnetic simulation method. The strength of the method is its simplicity and efficiency to model the electromagnetic field within a practical level of the accuracy. However, when one requires a quite accurate result, a great amount of computer resource is often required even if the geometry is relatively simple.This study proposes a technique for improving the accuracy of the FDTD method to analyze the planar structures printed on a dielectric substrate. The improvement is achieved by incorporating a quasi-static field behavior to the FDTD update equations The quasi-static field which is expressed as a closed form is obtained by a TEM approximation of a microstrip line. The modified FDTD algorithm is applied to the microstrip structures and the curved transmission line. It is confirmed numerically and experimentally that the proposed method is highly accurate and stable.
On the other hand, the estimation of the undesirable radiation will be done near the PCB because of the dynamic range of the measurement equipment. In this study the MUSIC algorithm was modified to estimate the near field electromagnetic radiation sources. The effectiveness of this method is confirmed theoretically.
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