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Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location
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A guard trace placed near a signal line reduces common-mode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E92-B No.6 pp.1929-1936
- Publication Date
- 2009/06/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E92.B.1929
- Type of Manuscript
- Special Section PAPER (Special Section on 3rd Pan-Pacific EMC Joint Meeting -- PPEMC'08--)
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Tohlu MATSUSHIMA, Tetsushi WATANABE, Yoshitaka TOYOTA, Ryuji KOGA, Osami WADA, "Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 6, pp. 1929-1936, June 2009, doi: 10.1587/transcom.E92.B.1929.
Abstract: A guard trace placed near a signal line reduces common-mode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1929/_p
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@ARTICLE{e92-b_6_1929,
author={Tohlu MATSUSHIMA, Tetsushi WATANABE, Yoshitaka TOYOTA, Ryuji KOGA, Osami WADA, },
journal={IEICE TRANSACTIONS on Communications},
title={Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location},
year={2009},
volume={E92-B},
number={6},
pages={1929-1936},
abstract={A guard trace placed near a signal line reduces common-mode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.},
keywords={},
doi={10.1587/transcom.E92.B.1929},
ISSN={1745-1345},
month={June},}
Copy
TY - JOUR
TI - Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location
T2 - IEICE TRANSACTIONS on Communications
SP - 1929
EP - 1936
AU - Tohlu MATSUSHIMA
AU - Tetsushi WATANABE
AU - Yoshitaka TOYOTA
AU - Ryuji KOGA
AU - Osami WADA
PY - 2009
DO - 10.1587/transcom.E92.B.1929
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2009
AB - A guard trace placed near a signal line reduces common-mode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.
ER -
English
