Transmission Characteristics and Shielding Effectiveness of Shielded-Flexible Printed Circuits for Differential-Signaling

Yoshiki KAYANO; Hiroshi INOUE

doi:10.1587/transele.E99.C.766

Transmission Characteristics and Shielding Effectiveness of Shielded-Flexible Printed Circuits for Differential-Signaling

Yoshiki KAYANO, Hiroshi INOUE

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To provide basic considerations for the realization of method for suppressing the EMI from differential-paired lines on flexible printed circuits (FPC), the characteristics of the SI performance and shielding effectiveness (SE) of shielded-flexible printed circuits for differential-signaling are investigated in this paper experimentally and by a numerical modeling. Firstly, transmission characteristics of TDR measurement and frequency response of |S_dd21| are discussed, from view point of signal integrity. Secondly, as the characteristics of the SE performance for EMI, frequency responses of magnetic field are investigated. Although placement of conductive shield near the paired-lines decreases characteristics impedance, |S_dd21| for the “with Cu 5.5 µm-thickness copper shield” is not deteriorated compared with “without shield” and sufficient SE performance for magnetic field can be established. But, thin-shield deteriorates SI as well as SE performances. The frequency response of |S_dd21| at higher frequencies for the “Ag 0.1 µm” case has the steep loss roll off. A reflection loss resulted from impedance-mismatching is not dominant factor of the losses. The dominant factor may be magnetic field leakage due to very thin-conductive shield.

Publication: IEICE TRANSACTIONS on Electronics Vol.E99-C No.7 pp.766-773

Publication Date: 2016/07/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E99.C.766

Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Simulation Techniques and Their Applications for Electronics)

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Authors

Yoshiki KAYANO
The University of Electro-Communications
Hiroshi INOUE
The Open University of Japan

Keyword

differential-signaling, electromagnetic shield, flexible printed circuits, differential-mode, common-mode

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Yoshiki KAYANO, Hiroshi INOUE, "Transmission Characteristics and Shielding Effectiveness of Shielded-Flexible Printed Circuits for Differential-Signaling" in IEICE TRANSACTIONS on Electronics, vol. E99-C, no. 7, pp. 766-773, July 2016, doi: 10.1587/transele.E99.C.766.
Abstract: To provide basic considerations for the realization of method for suppressing the EMI from differential-paired lines on flexible printed circuits (FPC), the characteristics of the SI performance and shielding effectiveness (SE) of shielded-flexible printed circuits for differential-signaling are investigated in this paper experimentally and by a numerical modeling. Firstly, transmission characteristics of TDR measurement and frequency response of |S_dd21| are discussed, from view point of signal integrity. Secondly, as the characteristics of the SE performance for EMI, frequency responses of magnetic field are investigated. Although placement of conductive shield near the paired-lines decreases characteristics impedance, |S_dd21| for the “with Cu 5.5 µm-thickness copper shield” is not deteriorated compared with “without shield” and sufficient SE performance for magnetic field can be established. But, thin-shield deteriorates SI as well as SE performances. The frequency response of |S_dd21| at higher frequencies for the “Ag 0.1 µm” case has the steep loss roll off. A reflection loss resulted from impedance-mismatching is not dominant factor of the losses. The dominant factor may be magnetic field leakage due to very thin-conductive shield.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E99.C.766/_p

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@ARTICLE{e99-c_7_766,
author={Yoshiki KAYANO, Hiroshi INOUE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Transmission Characteristics and Shielding Effectiveness of Shielded-Flexible Printed Circuits for Differential-Signaling},
year={2016},
volume={E99-C},
number={7},
pages={766-773},
abstract={To provide basic considerations for the realization of method for suppressing the EMI from differential-paired lines on flexible printed circuits (FPC), the characteristics of the SI performance and shielding effectiveness (SE) of shielded-flexible printed circuits for differential-signaling are investigated in this paper experimentally and by a numerical modeling. Firstly, transmission characteristics of TDR measurement and frequency response of |S_dd21| are discussed, from view point of signal integrity. Secondly, as the characteristics of the SE performance for EMI, frequency responses of magnetic field are investigated. Although placement of conductive shield near the paired-lines decreases characteristics impedance, |S_dd21| for the “with Cu 5.5 µm-thickness copper shield” is not deteriorated compared with “without shield” and sufficient SE performance for magnetic field can be established. But, thin-shield deteriorates SI as well as SE performances. The frequency response of |S_dd21| at higher frequencies for the “Ag 0.1 µm” case has the steep loss roll off. A reflection loss resulted from impedance-mismatching is not dominant factor of the losses. The dominant factor may be magnetic field leakage due to very thin-conductive shield.},
keywords={},
doi={10.1587/transele.E99.C.766},
ISSN={1745-1353},
month={July},}

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TY - JOUR
TI - Transmission Characteristics and Shielding Effectiveness of Shielded-Flexible Printed Circuits for Differential-Signaling
T2 - IEICE TRANSACTIONS on Electronics
SP - 766
EP - 773
AU - Yoshiki KAYANO
AU - Hiroshi INOUE
PY - 2016
DO - 10.1587/transele.E99.C.766
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E99-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2016
AB - To provide basic considerations for the realization of method for suppressing the EMI from differential-paired lines on flexible printed circuits (FPC), the characteristics of the SI performance and shielding effectiveness (SE) of shielded-flexible printed circuits for differential-signaling are investigated in this paper experimentally and by a numerical modeling. Firstly, transmission characteristics of TDR measurement and frequency response of |S_dd21| are discussed, from view point of signal integrity. Secondly, as the characteristics of the SE performance for EMI, frequency responses of magnetic field are investigated. Although placement of conductive shield near the paired-lines decreases characteristics impedance, |S_dd21| for the “with Cu 5.5 µm-thickness copper shield” is not deteriorated compared with “without shield” and sufficient SE performance for magnetic field can be established. But, thin-shield deteriorates SI as well as SE performances. The frequency response of |S_dd21| at higher frequencies for the “Ag 0.1 µm” case has the steep loss roll off. A reflection loss resulted from impedance-mismatching is not dominant factor of the losses. The dominant factor may be magnetic field leakage due to very thin-conductive shield.
ER -