Two-Core Flat Cable Shield Structure for RF Dip Reduction
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Solution Overview
Problem
Related-art two-core flat cables experience sharp signal attenuation, known as a 'dip', in the radio-frequency range, limiting their usage due to periodic structures in the shield and sheath.
Innovation Solution
A two-core flat cable design featuring a metal coating layer as the shield and a laminated sheet of insulating resin as the sheath, eliminating the periodic structure caused by winding tape-shaped members, thereby reducing signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shield and sheath are formed by winding tape-shaped members, then the manufacturing process is simple and cost-effective, but sharp signal attenuation called 'dip' occurs in the radio-frequency range
Solution Approach 1:
The patent extracts and eliminates the periodic winding structure from the shield and sheath, replacing it with a continuous non-periodic construction. This removes the source of the dip phenomenon while maintaining manufacturing feasibility through alternative application methods for the metal coating and insulating resin.
Solution Approach 2:
The patent changes the fundamental parameter of the shield and sheath structure from periodic (winding) to non-periodic (continuous coating). This parameter change eliminates the resonant frequencies that cause signal attenuation dips in the radio-frequency range, thereby improving signal transmission quality.
2Device complexity
If a tape-shaped member is wound to form the shield and sheath, then the cable structure is easily assembled, but periodic structure causes signal attenuation in radio-frequency range
Solution Approach 1:
The patent removes the periodic winding structure that causes energy loss through signal attenuation. By extracting this harmful periodic element and replacing it with a continuous non-periodic structure, the cable eliminates the dip phenomenon while maintaining structural integrity and assembly simplicity.
3Ease of manufacture
If the shield is formed by winding metal tape, then the shielding effect is achieved with simple process, but periodic structure creates harmful signal attenuation
Solution Approach 1:
The patent converts the harmful periodic structure into a beneficial non-periodic continuous coating. By eliminating the periodicity that causes signal attenuation, the shield maintains its protective function while preventing the generation of harmful attenuation dips in the radio-frequency range.
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, an electrically conductive shield that covers an entire perimeter surface of the covering, and an insulating sheath that covers the shield, wherein the shield is comprised of a metal coating laver, and the sheath is comprised of a lamination sheet of an insulating resin.