Flexible circuit board
A technology of flexible circuit boards and differential transmission lines, which is applied to printed circuits, printed circuits, electrical components, etc., and can solve problems such as common mode noise and the inability of flexible circuit boards to transmit high-speed differential signals
Inactive Publication Date: 2009-03-25
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
View PDF0 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 on the signal layer 10 , and the differential transmission line 14 is disposed on 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 laid on the ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A flexible circuit board comprises a signal layer, a grounding layer and a differential pair. The signal layer and the grounding layer are filled with a layer of insulating medium; the differential pair comprises two differential transmission lines, wherein one differential transmission line is laid on the signal layer, the other differential transmission line is laid on the grounding layer; a hollow area is formed on the grounding layer on the part vertically opposite to the differential transmission line on the signal layer; and the two differential transmission lines have dislocation spacing in the horizontal direction. The flexible circuit board can transmit high-speed signals and eliminate common mode noise derived by the meshing grounding layer in the prior art. The flexible circuit board can be realized just by adjusting the prior wiring manner, without the need of additional cost.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H05K1/00
CPCH05K1/0393H05K1/0245H05K2201/09672H05K2201/09336H05K2201/09318H05K2201/09236
Inventor 白育彰许寿国刘建宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD