Investigation on Radiated Emission Characteristics of Multilayer Printed Circuit Boards
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概要
- 論文の詳細を見る
This paper analyzes mechanisms of radiated emissions from multilayer printed circuit boards (PCBs) and presents a model to describe the characteristics of such radiation. The radiation mechanism from a four-layer PCB, including the internal power and ground planes, is investigated using a time-domain magnetic field measurement near the PCB. Measurement of the waveform indicates that the main source of radiation is in the power distribution planes. To investigate the characteristics of the radiation from the power distribution, the S_<21>s of the board are measured; the board impedance and the transmission characteristics of the power distribution planes are found to be directly related to the S_<21> between the two points in the board. The results indicate that the power distribution acts as a transmission line at frequencies higher than 100 MHz. A model that can explain well the radiation properties of these planes treats them as a parallel-plate transmission line interconnected by decoupling circuit comprising a decoupling capacitor and interconnect inductance. From the transmission line theory it is deduced that the line resonance gives rise to strong radiated emissions. The interconnect inductance is an important factor in determining the radiation characteristics.
- 社団法人電子情報通信学会の論文
- 1997-11-25
著者
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Kami Y
University Of Electro-communications
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Kami Yoshio
The Univ. Of Electro-commun.
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Sasaki H
Nec Corp. Kawasaki‐shi Jpn
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HARADA Takashi
Resources & Environment Protection Research Laboratories, NEC Corporation
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SASAKI Hideki
Resources & Environment Protection Research Laboratories, NEC Corporation
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Harada T
Nec Corp. Kawasaki‐shi Jpn
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- FOREWORD