Shielded Cable Pinched Portions Resonance Loss
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Solution Overview
Problem
Conventional electrical cables face challenges in supporting high-speed signal transmission with minimal interference and crosstalk, particularly in densely interconnected devices, due to limitations in shielding effectiveness and connector compatibility for mass-termination techniques.
Innovation Solution
The development of a shielded electrical cable with strategically arranged conductor sets, shielding films, and a drain wire, where the shielding films have pinched portions that closely surround the conductor sets and an adhesive layer between pinched portions, reducing resonance-induced insertion loss and enhancing high-frequency isolation, allowing for efficient signal transmission and simplified connector integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional shielding structures are used, then shielding coverage is achieved, but resonance-induced insertion loss increases at high frequencies
Solution Approach 1:
The continuous shielding film is divided into discrete pinched portions spaced along the cable length. This segmentation prevents the formation of continuous resonant paths while maintaining localized shielding effectiveness around each conductor set, thereby reducing resonance-induced insertion loss at high frequencies
Solution Approach 2:
The shielding structure transitions from uniform continuous coverage to non-uniform distributed pinched portions. Each pinched portion provides concentrated shielding where needed, while the spacing between portions eliminates resonant conditions. This local variation in shielding density optimizes the balance between shielding effectiveness and resonance suppression
2Area of stationary object
If conductor sets are spaced closely for high density, then cable compactness improves, but crosstalk between adjacent conductors increases
Solution Approach 1:
Dielectric members are positioned between adjacent conductor sets to act as electromagnetic isolators. These intermediary dielectric barriers reduce capacitive coupling and electromagnetic interference between closely spaced conductors, enabling high-density packing while maintaining signal isolation and minimizing crosstalk
3Object-affected harmful factors
If shielded cable structure is used, then signal shielding is achieved, but compatibility with mass-termination techniques is lost
Solution Approach 1:
The shielding film is segmented into discrete pinched portions rather than forming a continuous envelope around each conductor. This segmentation allows conductors to be individually accessed and terminated at the cable end, enabling mass-termination techniques while maintaining shielding effectiveness through the distributed pinched portions that can be easily stripped or terminated
Data Source
AI summary
A shielded electrical cable includes a plurality of conductor sets extending along a length of the cable and arranged generally in a plane along a width of the cable. Each conductor set has two insulated conductors. One conductor set includes a drain wire. The conductor of each insulated conductor has a size no greater than 24 AWG. Each conductor set is substantially surrounded by a shield. The cable further includes first and second non-conductive polymeric layers disposed on opposite sides of the cable. The polymeric layers include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions, in combination, substantially surround the plurality of conductor sets, and the pinched portions, in combination, form pinched portions of the cable on each side of the plurality of the conductor sets. The separation between the drain wire and the conductor of the closest insulated conductor of the closest conductor set is greater than 0.5 times the center to center spacing between the two insulated conductors of the closest conductor set.