Flat Cable With Central Insulation Layer For Impedance Control
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Solution Overview
Problem
Existing flat cables with one-layer designs are inadequate for high-speed data transmission due to lack of uniformity in conductor spacing, leading to impedance variations and insufficient flexibility and mechanical durability for applications like mobile devices that require high-frequency data transfer.
Innovation Solution
A flat cable design featuring two conductor planes with a central insulation layer of higher hardness than the outer insulation layer, maintaining uniform conductor spacing and preventing displacement during compression or flexing, allowing for high uniformity in impedance and improved mechanical loadability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-layered flat cable design is used, then the cable structure is simple and easy to manufacture, but the conductor spacing uniformity is insufficient leading to impedance variations
Solution Approach 1:
The flat cable is divided into multiple layers (first conductor plane, second conductor plane) with a central insulation layer separating them. This segmentation allows independent positioning of conductors in each plane while maintaining precise spacing through the central insulation layer, thereby achieving uniform conductor spacing and consistent impedance without compromising manufacturing simplicity.
2Shape
If the central insulation layer material is softer, then the outer insulation layer maintains its shape better, but the conductor spacing changes under compression affecting impedance
Solution Approach 1:
The central insulation layer is made of a material with different properties (higher hardness, lower compression modulus) compared to the outer insulation layer. This local quality differentiation ensures that under compression, the outer insulation layer deforms to maintain shape stability while the central insulation layer resists compression to maintain conductor spacing uniformity, thereby preserving impedance consistency.
3Object-affected harmful factors
If shielded flat cables are used, then EMC performance is improved, but flexibility and packing density are reduced
Solution Approach 1:
The invention extracts and eliminates the shielding layers from the flat cable design while maintaining EMC performance through the differential signal transmission structure and precise conductor spacing achieved by the multi-layer construction. This removal of unnecessary shielding components increases flexibility and allows for higher packing density of conductors.
4Ease of manufacture
If conventional flat cables are used, then production is simple, but they cannot ensure high uniformity of impedance for high-speed data transmission
Solution Approach 1:
The invention transitions from a conventional one-layered flat cable to a multi-layered structure with conductor planes stacked in the thickness direction. This dimensional change allows precise control of conductor spacing through the central insulation layer thickness, achieving high impedance uniformity required for high-speed data transmission while maintaining production simplicity through standardized layer stacking.
Data Source
AI summary
A flat cable having at least two conductor planes, in which a number of electrical conductors running in the longitudinal direction of the cable are arranged, in which the electrical conductors in the flat cable thickness direction and/or in the flat cable width direction are kept at a defined distance from each other by means of a central insulation layer of predetermined thickness acting as a spacer insulator and are electrically insulated and positioned relative to each other and to the flat cable exterior by means of an outer insulation layer.