Flexible flat cable for high-speed signal transmission

Abstract

Disclosed is a flexible flat cable for transmitting high-speed signals. The flexible flat cable comprises a grounding signal layer, an upper insulating layer, a conductive wire rod layer, a lower insulating layer and a reference plane layer, wherein the conductive wire rod layer comprises multiple conductors which are arranged in parallel at equal spacings; the upper insulating layer and the lower insulating layer are adhered to the upward side and the downward side of the conductive wire rod layer, and are used for coating the conductive wire rod layer in the middle; the reference plane layer is adhered to the lower insulating layer; and the upper insulating layer and the reference plane layer are coated with the grounding signal layer. According to the technical scheme provided by the invention, the reference plane layer is arranged on the lower insulating layer additionally, so that the flexible flat cable (FFC) has the reference plane; the crosstalk performance of the product is improved; the grounding signal layer is provided additionally, so that high contact between the grounding PINs of the conductors and the reference plane is ensured; due to the combination of the reference plane layer and the grounding signal layer, the requirement of high-speed signal transmission is satisfied; and meanwhile, the original characteristics of flexibility, property of being optionally bent and folded, and thin thickness of the FFC are kept.

Description

technical field [0001] The present invention relates to a flexible flat cable (FFC). Background technique [0002] FFC (Flexible Flat Cable), that is, flexible flat cable, is a new type of data cable made of PET insulation material and extremely thin tinned flat copper wire, which is laminated by high-tech automatic equipment production line. Folding, thin thickness, small size, simple connection, easy disassembly, easy to solve electromagnetic shielding (EMI), etc., the number and spacing of wires can be selected arbitrarily, making wiring more convenient, greatly reducing the volume of electronic products, reducing production costs, and improving Production efficiency, most suitable for data transmission cables between moving parts and motherboards, between PCB boards and PCB boards, and in miniaturized electrical equipment. Common specifications include 0.5mm, 0.8mm, 1.0mm, 1.25mm, 1.27mm, 1.5mm, 2.0mm, 2.54mm and other flexible cables, which are widely used in the conne...

AI Technical Summary

Problems solved by technology

[0003] But the current FFC institutions such as figure 1 As shown, including copper conductor 2, insulating tapes 1 and 3 on the upper and lower sides of the copper conductor, and reinforcing plate 4 under the insulating tape on one side, the current FFC is mainly used for low-speed control with a transmission rate lower than 3Gbps Signal and differential signal, but the attenuation of the product is poor, and the crosstalk performance will deteriorate above 4GHz, which cannot meet the transmission requirements of 5G, let alone transmit high-speed differential signals above 10Gbps

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