The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
A emissão de radiação em zonas distantes de placas de circuito impresso (PCBs) é obtida tratando as linhas em PCBs como linhas de transmissão e calculando a emissão de campo distante devido à distribuição de corrente nas linhas. Neste artigo, apresentamos um modelo de circuito mais preciso, baseado na suposição de TEM, para decompor a corrente total em corrente de modo diferencial e corrente de modo comum. Este modelo de circuito é baseado no modelo de linha de transmissão, mas considera o efeito do traço de terra. O traço de terra de tamanho finito pode ser visto como uma reatância indutiva. O conhecimento da indutância líquida do traço de terra pode auxiliar na análise e investigação da emissão de PCBs. Mostramos as equações derivadas das linhas de transmissão modificadas para a geometria de interesse prático. À medida que a corrente variável no tempo passa através desse traço de terra, uma queda de tensão devido à indutância do traço atuará como uma fonte da corrente de modo comum. Além disso, a carga armazenada na capacitância entre o sinal e os traços de terra fará com que os pulsos de corrente retornem à sua fonte. As magnitudes das correntes são ligeiramente desiguais nos traços de sinal e de terra, o que pode fazer com que a corrente de modo comum flua. Um circuito desequilibrado em uma PCB construída com pares de sinal e traço de terra irradiará como um dipolo dobrado assimétrico. Pela teoria da antena, a contribuição das correntes de modo diferencial e de modo comum para a emissão irradiada de PCBs pode ser calculada. Além disso, também são fornecidas comparações entre resultados experimentais e resultados de cálculo.
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I-Fong CHEN, Ching-Wen HSUE, Ming-Chih KUAN, Wen-Yuh LUO, "Modeling the Imperfect Ground of Printed Circuit Boards Based on TEM Assumption" in IEICE TRANSACTIONS on Communications,
vol. E83-B, no. 9, pp. 2124-2129, September 2000, doi: .
Abstract: The radiation emission in far zones from printed circuit boards (PCBs) is obtained by treating lines on PCBs as transmission lines and calculating the far-field emission due to current distribution on lines. In this paper, we present a more precise circuit model, based on TEM assumption, to decompose the total current into differential-mode current and common-mode current. This circuit model is based on transmission line model, but it considers the effect of ground trace. The finite size ground trace can be viewed as an inductive reactance. A knowledge of the net inductance of the ground trace can aid in the analysis and investigation of PCBs emission. We show the derived equations of the modified transmission lines for the geometrics of practical interest. As time-varying current passes through such ground trace, a voltage drop due to the inductance of the trace will act as a source of the common-mode current. Furthermore, charge stored in capacitance between signal and ground traces will cause the current pulses returning to their source. The magnitudes of currents are slightly unequal in the signal and ground traces, which can cause common-mode current to flow. An unbalanced circuit on a PCB constructed with signal and ground trace pairs will radiate as an asymmetric folded-dipole. By antenna theory, the contribution of differential-mode and common-mode currents to radiated emission of PCBs can be calculated. In addition, comparisons between experimental results and calculation results are also given.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e83-b_9_2124/_p
Copiar
@ARTICLE{e83-b_9_2124,
author={I-Fong CHEN, Ching-Wen HSUE, Ming-Chih KUAN, Wen-Yuh LUO, },
journal={IEICE TRANSACTIONS on Communications},
title={Modeling the Imperfect Ground of Printed Circuit Boards Based on TEM Assumption},
year={2000},
volume={E83-B},
number={9},
pages={2124-2129},
abstract={The radiation emission in far zones from printed circuit boards (PCBs) is obtained by treating lines on PCBs as transmission lines and calculating the far-field emission due to current distribution on lines. In this paper, we present a more precise circuit model, based on TEM assumption, to decompose the total current into differential-mode current and common-mode current. This circuit model is based on transmission line model, but it considers the effect of ground trace. The finite size ground trace can be viewed as an inductive reactance. A knowledge of the net inductance of the ground trace can aid in the analysis and investigation of PCBs emission. We show the derived equations of the modified transmission lines for the geometrics of practical interest. As time-varying current passes through such ground trace, a voltage drop due to the inductance of the trace will act as a source of the common-mode current. Furthermore, charge stored in capacitance between signal and ground traces will cause the current pulses returning to their source. The magnitudes of currents are slightly unequal in the signal and ground traces, which can cause common-mode current to flow. An unbalanced circuit on a PCB constructed with signal and ground trace pairs will radiate as an asymmetric folded-dipole. By antenna theory, the contribution of differential-mode and common-mode currents to radiated emission of PCBs can be calculated. In addition, comparisons between experimental results and calculation results are also given.},
keywords={},
doi={},
ISSN={},
month={September},}
Copiar
TY - JOUR
TI - Modeling the Imperfect Ground of Printed Circuit Boards Based on TEM Assumption
T2 - IEICE TRANSACTIONS on Communications
SP - 2124
EP - 2129
AU - I-Fong CHEN
AU - Ching-Wen HSUE
AU - Ming-Chih KUAN
AU - Wen-Yuh LUO
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E83-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2000
AB - The radiation emission in far zones from printed circuit boards (PCBs) is obtained by treating lines on PCBs as transmission lines and calculating the far-field emission due to current distribution on lines. In this paper, we present a more precise circuit model, based on TEM assumption, to decompose the total current into differential-mode current and common-mode current. This circuit model is based on transmission line model, but it considers the effect of ground trace. The finite size ground trace can be viewed as an inductive reactance. A knowledge of the net inductance of the ground trace can aid in the analysis and investigation of PCBs emission. We show the derived equations of the modified transmission lines for the geometrics of practical interest. As time-varying current passes through such ground trace, a voltage drop due to the inductance of the trace will act as a source of the common-mode current. Furthermore, charge stored in capacitance between signal and ground traces will cause the current pulses returning to their source. The magnitudes of currents are slightly unequal in the signal and ground traces, which can cause common-mode current to flow. An unbalanced circuit on a PCB constructed with signal and ground trace pairs will radiate as an asymmetric folded-dipole. By antenna theory, the contribution of differential-mode and common-mode currents to radiated emission of PCBs can be calculated. In addition, comparisons between experimental results and calculation results are also given.
ER -