Shielded Cable Crimp Structure for Impedance Matching
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Solution Overview
Problem
Existing crimp structures for shielded cables often result in impedance mismatch due to the reduction in diameter of the dielectric body when the outer conductor and ground contact are crimped without proper measures, leading to signal reflection and inefficient high-speed signal transmission.
Innovation Solution
A crimp structure that includes an insulated ferrule disposed inside the outer conductor of the shielded cable, which maintains the radial distance between the core wire and the outer conductor by compensating for the diameter reduction, ensuring impedance matching through the crimping process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer conductor and ground contact are crimped without taking particular measures, then the connection between outer conductor and ground contact is achieved, but the diameter of the dielectric body is reduced, resulting in a decrease in radial distance between core wire and outer conductor, causing impedance mismatch
Solution Approach 1:
A dielectric member is introduced as an intermediary component between the core wire and outer conductor within the crimp section. This dielectric member compensates for the diameter reduction caused by crimping, thereby maintaining the radial distance and ensuring impedance matching without requiring special measures during the crimping process itself
2Shape
If the dielectric material and socket housing are placed inside the outer conductor to prevent diameter reduction, then the diameter is maintained, but the radial distance between core wire and outer conductor becomes non-uniform, causing impedance mismatch
Solution Approach 1:
The dielectric member is positioned specifically within the crimp section where diameter reduction occurs, rather than uniformly throughout the entire connector. This localized placement maintains diameter only where needed while preserving uniform radial distance in other sections, thus achieving impedance matching
Data Source
AI summary
A crimp structure includes a crimp section having an insulated ferrule disposed inside an outer conductor of a shielded cable. The outer conductor and a ground contact placed on an outer periphery of the outer conductor are crimped.