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flexible circuit board

A flexible circuit board and differential transmission line technology, which is applied in printed circuits, printed circuits, electrical components, etc., can solve the problems that flexible circuit boards cannot transmit high-speed differential signals, common mode noise, etc.

Inactive Publication Date: 2011-11-30
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, if the differential signal is transmitted by laying out the differential pair 51 on the signal layer, the copper foil grid layout of the ground layer corresponding to the differential transmission line 52 and the differential transmission line 54 will be different, resulting in the generation of common mode noise, which is also a common flexible circuit. Reasons why the board cannot transmit high-speed differential signals

Method used

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Embodiment Construction

[0011] Please refer to figure 2 A preferred embodiment of the flexible circuit board of the present invention includes a signal layer 10 and a ground layer 30 , and a layer of insulating medium 20 is filled between the signal layer 10 and the ground layer 30 . A differential pair 11 includes two differential transmission lines 12 and 14 , wherein the differential transmission line 12 is disposed in the signal layer 10 , and the differential transmission line 14 is disposed in the ground layer 30 . The part vertically corresponding to the ground layer 30 below the differential transmission line 12 is hollowed out to avoid the low impedance of the transmission line caused by the close distance between the differential transmission line 12 and the ground layer 30 . Since the corresponding part of the ground layer 30 below the differential transmission line 12 is a hollowed-out area, there will be a dislocation distance d between the differential transmission line 12 arranged in ...

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Abstract

A flexible circuit board, comprising a signal layer, a ground layer and a differential pair, a layer of insulating medium is filled between the signal layer and the ground layer, the differential pair includes two differential transmission lines, one of which is laid In the signal layer, another differential transmission line is arranged in the ground layer, and the part of the ground layer vertically opposite to the differential transmission line in the signal layer is a hollow area, and the two differential transmission lines are in the There is a dislocation interval in the horizontal direction. The flexible circuit board can transmit high-speed signals and eliminate the common-mode noise problem caused by the meshed ground plane in the prior art. The flexible circuit board does not need to increase additional cost, and can be realized only by adjusting the existing wiring method.

Description

technical field [0001] The invention relates to a flexible circuit board, in particular to a flexible circuit board capable of transmitting high-speed differential signals. Background technique [0002] Flexible circuit boards are printed circuit boards made of flexible insulating substrates, which have many advantages that rigid printed circuit boards do not have. For example, the thickness of the flexible circuit board is relatively thin, and it can be bent, wound, and folded freely, and can be arranged arbitrarily according to the requirements of the space layout, and can be moved and stretched arbitrarily in the three-dimensional space, so as to achieve the integration of component assembly and wire connection. The use of flexible circuit boards can greatly reduce the size of electronic products, and is suitable for the development of electronic products in the direction of high density, miniaturization, and high reliability. Therefore, flexible circuit boards have been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K1/00
CPCH05K2201/09318H05K1/0393H05K1/0245H05K2201/09236H05K2201/09336H05K2201/09672
Inventor 白育彰许寿国刘建宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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