Two-Core Flat Cable Coating Structure for RF Dip Reduction
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Solution Overview
Problem
Related-art two-core flat cables experience sharp signal attenuation, or 'dips', in the radio-frequency range due to the periodic structures of their metal shields and insulating sheaths, limiting their use in this frequency range.
Innovation Solution
A two-core flat cable design featuring a metal coating layer as a shield and an insulating resin lamination sheet as a sheath, eliminating the periodic structures typically formed by winding tape-shaped members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tape-shaped member is wound around the covering to form the shield and sheath, then the cable structure is easy to manufacture, but signal attenuation called 'dip' occurs in the radio-frequency range
Solution Approach 1:
The patent replaces the mechanical winding process with a coating process. Specifically, the shield is formed by coating an electrically conductive material onto the covering surface, and the sheath is formed by coating an insulating material onto the shield. This substitution eliminates the periodic structure inherent in wound tapes while maintaining protective and functional properties.
Solution Approach 2:
The patent changes the structural parameter of the shield and sheath from a periodic wound-tape configuration to a continuous coated layer configuration. This parameter change eliminates the periodicity that causes signal dips in the radio-frequency range, thereby improving signal transmission quality while maintaining manufacturing feasibility through coating processes.
2Ease of manufacture
If the shield and sheath are formed by winding tape, then the cable can be manufactured with conventional processes, but the periodic structure causes sharp signal attenuation in radio-frequency range
Solution Approach 1:
The patent substitutes the mechanical winding system with a coating system. The shield is created by coating an electrically conductive material onto the covering, and the sheath is created by coating an insulating material onto the shield. This eliminates the periodic structure that causes signal attenuation while maintaining manufacturing simplicity through established coating techniques.
Solution Approach 2:
The patent changes the structural parameter from periodic wound tape to continuous coated layer. This parameter change removes the source of signal attenuation (the periodic structure) while maintaining ease of manufacture through conventional coating processes, thus resolving the contradiction between manufacturing simplicity and signal transmission quality.
Data Source
AI summary
A two-core flat cable includes a pair of metal wires, an insulating covering that bundles and covers the pair of metal wires along a longitudinal direction thereof, the insulating covering having an oval cross-sectional shape, an electrically conductive shield that is in direct contact with the covering along an entire perimeter of the covering so as to cover the covering, and an insulating sheath that covers the shield.