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Practical Design Methodology of Mode-Conversion-Free Tightly Coupled Asymmetrically Tapered Bend for High-Density Differential Wiring
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The plain bend in a pair of differential transmission lines causes a path difference, which leads to differential-to-common mode conversion due to the phase difference. This conversion can cause serious common-mode noise issues. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion and derived the constraint conditions for high-density wiring. To provide sufficient suppression of mode conversion, however, the additional correction was required to make the effective path difference vanish. This paper proposes a practical and straightforward design methodology by using a very tightly coupled bend (decreasing the line width and the line separation of the tightly coupled bend). Full-wave simulations below 20GHz demonstrated that sufficient suppression of the forward differential-to-common mode conversion is successfully achieved as designed. Measurements showed that our design methodology is effective.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E104-B No.3 pp.304-311
- Publication Date
- 2021/03/01
- Publicized
- 2020/09/15
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.2020EBP3056
- Type of Manuscript
- PAPER
- Category
- Electromagnetic Compatibility(EMC)
Authors
Chenyu WANG
Okayama University
Kengo IOKIBE
Okayama University
Yoshitaka TOYOTA
Okayama University
Keyword
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Chenyu WANG, Kengo IOKIBE, Yoshitaka TOYOTA, "Practical Design Methodology of Mode-Conversion-Free Tightly Coupled Asymmetrically Tapered Bend for High-Density Differential Wiring" in IEICE TRANSACTIONS on Communications,
vol. E104-B, no. 3, pp. 304-311, March 2021, doi: 10.1587/transcom.2020EBP3056.
Abstract: The plain bend in a pair of differential transmission lines causes a path difference, which leads to differential-to-common mode conversion due to the phase difference. This conversion can cause serious common-mode noise issues. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion and derived the constraint conditions for high-density wiring. To provide sufficient suppression of mode conversion, however, the additional correction was required to make the effective path difference vanish. This paper proposes a practical and straightforward design methodology by using a very tightly coupled bend (decreasing the line width and the line separation of the tightly coupled bend). Full-wave simulations below 20GHz demonstrated that sufficient suppression of the forward differential-to-common mode conversion is successfully achieved as designed. Measurements showed that our design methodology is effective.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2020EBP3056/_p
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@ARTICLE{e104-b_3_304,
author={Chenyu WANG, Kengo IOKIBE, Yoshitaka TOYOTA, },
journal={IEICE TRANSACTIONS on Communications},
title={Practical Design Methodology of Mode-Conversion-Free Tightly Coupled Asymmetrically Tapered Bend for High-Density Differential Wiring},
year={2021},
volume={E104-B},
number={3},
pages={304-311},
abstract={The plain bend in a pair of differential transmission lines causes a path difference, which leads to differential-to-common mode conversion due to the phase difference. This conversion can cause serious common-mode noise issues. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion and derived the constraint conditions for high-density wiring. To provide sufficient suppression of mode conversion, however, the additional correction was required to make the effective path difference vanish. This paper proposes a practical and straightforward design methodology by using a very tightly coupled bend (decreasing the line width and the line separation of the tightly coupled bend). Full-wave simulations below 20GHz demonstrated that sufficient suppression of the forward differential-to-common mode conversion is successfully achieved as designed. Measurements showed that our design methodology is effective.},
keywords={},
doi={10.1587/transcom.2020EBP3056},
ISSN={1745-1345},
month={March},}
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TY - JOUR
TI - Practical Design Methodology of Mode-Conversion-Free Tightly Coupled Asymmetrically Tapered Bend for High-Density Differential Wiring
T2 - IEICE TRANSACTIONS on Communications
SP - 304
EP - 311
AU - Chenyu WANG
AU - Kengo IOKIBE
AU - Yoshitaka TOYOTA
PY - 2021
DO - 10.1587/transcom.2020EBP3056
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E104-B
IS - 3
JA - IEICE TRANSACTIONS on Communications
Y1 - March 2021
AB - The plain bend in a pair of differential transmission lines causes a path difference, which leads to differential-to-common mode conversion due to the phase difference. This conversion can cause serious common-mode noise issues. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion and derived the constraint conditions for high-density wiring. To provide sufficient suppression of mode conversion, however, the additional correction was required to make the effective path difference vanish. This paper proposes a practical and straightforward design methodology by using a very tightly coupled bend (decreasing the line width and the line separation of the tightly coupled bend). Full-wave simulations below 20GHz demonstrated that sufficient suppression of the forward differential-to-common mode conversion is successfully achieved as designed. Measurements showed that our design methodology is effective.
ER -
English
