Shield Conductive Path Impedance Matching via Non-Contact Cover
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Solution Overview
Problem
Existing shield conductive paths face reduced transmission performance due to impedance mismatch between the inner conductor terminal and the shield shell, particularly at the connecting portion, where the outer diameter of the conductor connecting portion is smaller than the terminal body, leading to inconsistent impedance across the shielded cable length.
Innovation Solution
A shield conductive path configuration where a tubular shield layer surrounds the core, with an outer conductor shell and a shield cover that includes a cover body and a coupling, allowing the inner conductor terminal to be fixed to the core and the shield cover to surround the inner conductor connecting portion in a non-contact manner, ensuring impedance matching across different sizes and improving transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer diameter of the conductor connecting portion is reduced to accommodate smaller terminals, then the inner conductor terminal can be made more compact, but the impedance in the connecting region becomes inconsistent with other regions, reducing transmission performance
Solution Approach 1:
The shield cover acts as an intermediary component between the inner conductor terminal and the outer conductor shell. It provides a mediating structure that maintains consistent impedance by surrounding the inner conductor connecting portion with a diameter that matches the terminal body diameter, even when the connecting portion itself is smaller. This intermediary structure bridges the impedance mismatch that would otherwise occur at the connecting region.
Solution Approach 2:
The shield cover applies local quality by providing a localized impedance-matching structure only where needed - at the inner conductor connecting portion. The cover body has a specific diameter designed to match the terminal body diameter, creating a localized region of consistent impedance characteristics without requiring the entire conductor structure to be uniformly sized.
2Reliability
If a separate shield cover is introduced to maintain impedance matching, then transmission performance is improved, but the device complexity increases due to additional components
Solution Approach 1:
The shield cover serves multiple functions simultaneously: it provides impedance matching by surrounding the inner conductor connecting portion, acts as a shield layer extension for electromagnetic interference protection, and provides structural support for maintaining the positional relationship between conductors. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The shield cover merges the functions of impedance matching structure and electromagnetic shielding into a single integrated component. Rather than having separate impedance matching fixtures and shield layers, the shield cover combines these functions, reducing overall device complexity while maintaining transmission performance.
Data Source
AI summary
A shield conductive path includes a shielded wire (10). An outer conductor shell (20) has a tubular shell body (21), a shell-side fixing portion (26) and a coupling (23) extending therebetween. The shell-side fixing portion (26) is fixed to a front part (13F) of a braided wire (13). An inner conductor terminal (40) has a terminal body (41) at a front part and a terminal-side fixing portion (42) in a rear part. The terminal body (41) is accommodated in the shell body (21). The terminal-side fixing portion (42) is fixed to a front part (11F) of a core (11) in the coupling (23), and a shield cover (50) surrounds an inner conductor connecting portion (45) composed of the front part (11F) of the core (11) and the terminal-side fixing portion (42) in a non-contact manner.