Analysis of Transmission Characteristics of Three-Layer Flexible Printed Circuit Board

Du-I Kang, Hosang Lee, J. Yousaf, W. Nah
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引用次数: 1

Abstract

A FPCB (Flexible Printed Circuit Board) has been used in various electronic products such as smart phones, wearable devices, and tablet PC's, etc. In high performance electronic devices with multiple modules to be connected, high speed signal data usually needs to be transmitted through FPCB between the modules. Due to the laminated structure of the multilayer FPCB, however, an air gap could be introduced between the FPCB layers when it is bent, which deviates the designed characteristic impedance of the FPCB. For the prediction of the bent FPCB characteristics, a 3D electromagnetic model has been used, but the calculation time is too long, especially due to the meshed ground employed in FPCB. In this paper, we propose a circuit model which efficiently predicts the characteristic impedance of the bent FPCB with an air gap inside layers. The validity of the proposed model was verified between the EM simulation and measured results.
三层柔性印刷电路板传输特性分析
柔性印刷电路板(FPCB)已经应用于各种电子产品,如智能手机、可穿戴设备、平板电脑等。在需要连接多个模块的高性能电子设备中,通常需要通过FPCB在模块之间传输高速信号数据。然而,由于多层FPCB的叠层结构,当FPCB弯曲时,在FPCB层之间会引入气隙,使FPCB的设计特性阻抗偏离。对于弯曲FPCB特性的预测,已经采用了三维电磁模型,但由于FPCB采用网格地面,计算时间过长。在本文中,我们提出了一个电路模型,可以有效地预测弯曲FPCB的特性阻抗。仿真结果和实测结果验证了该模型的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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