Correspondence of Common- and Differential-Mode Components on EM Radiation from Surface Microstrip Line Structure(Signal Transmission, <Special Section>IS-EMD2004-Recent Development of Electro-Mechanical Devices)
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概要
- 論文の詳細を見る
It has been demonstrated that a common-mode (CM) current can dominate the EMI processes up to 1 GHz, despite the fact that a CM current is smaller than a differential-mode (DM) current. However, this description is insufficient to describe behavior above 1 GHz. In this paper, the correspondence of CM and DM components for total electromagnetic (EM) radiation from a printed circuit board (PCB) with surface microstrip line, which is commonly used in microwave integrated circuits, at gigahertz frequency is studied experimentally and with finite-difference time-domain (FDTD) modeling. In order to characterize the EM radiation, the frequency response of the CM current, the electric field near the PCB, and the electric far field are investigated. First, the frequency response of the CM current, near and far-fields for the PCB with an attached feed cable are compared up to 5 GHz. Although the CM current decreases above a few gigahertz, near and far electric fields increase as the frequency becomes higher. Second, in order to distinguish between CM and DM radiation at high frequency, the frequency response and the angle pattern of the far-field from a PCB without the feed cable are discussed. The results show that radiation up to 1 GHz is related to the CM component. However, depending on polarization and PCB geometry, radiation may be dominated by the DM rather than the CM component. The results indicate that the DM component may be more significant relative to the CM component, and the increase in EM radiation can not be predicted from only the frequency response of CM current. Therefore, identifying the dominant component is essential for suppressing the EM radiation. This study is a basic consideration to realize a technique which is effective on the suppression of the EM radiation from the PCB with an attached feed cable.
- 社団法人電子情報通信学会の論文
- 2005-08-01
著者
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INOUE Hiroshi
Department of Internal Medicine, University of Toyama
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KAYANO Yoshiki
Department of Electrical and Electronic Engineering, Akita University
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Tanaka M
Department Of Electronics & Computer Engineering Gifu-university
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Kayano Yoshiki
Akita Univ. Jpn
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Kayano Yoshiki
Department Of Electrical And Electronic Engineering Akita University
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Tanaka M
Department Of Electrical And Electronic Engineering Akita University
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Inoue H
Faculty Of Engineering And Resource Science Akita University
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TANAKA Motoshi
Department of Electrical and Electronic Engineering, Akita University
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Inoue Hiroshi
Departmcnt Of Biology Faculty Of Science Kyushu University:(present)department Of Biology Kyushu Den
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Inoue Hiroshi
Deparment of Neurosurgery, Gunma University School of Medicine and Gamma Unit Center, Hidaka Hospital
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