TY - JOUR
T1 - Transmission characteristics and shielding effectiveness of shielded-flexible printed circuits for differential-signaling
AU - Kayano, Yoshiki
AU - Inoue, Hiroshi
N1 - Funding Information:
This research was supported by JSPS KAKENHI [Grant in Aid for Young Scientists (B), Grant Number 26820091].
Publisher Copyright:
© 2016 The Institute of Electronics, Information and Communication Engineers.
PY - 2016/7
Y1 - 2016/7
N2 - 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 differentialsignaling 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 ìm-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 ìm" 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.
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 differentialsignaling 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 ìm-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 ìm" 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.
KW - Common-mode
KW - Differential-mode
KW - Differential-signaling
KW - Electromagnetic shield
KW - Flexible printed circuits
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U2 - 10.1587/transele.E99.C.766
DO - 10.1587/transele.E99.C.766
M3 - Article
AN - SCOPUS:84976867037
SN - 0916-8524
VL - E99C
SP - 766
EP - 773
JO - IEICE Transactions on Electronics
JF - IEICE Transactions on Electronics
IS - 7
ER -