Shielded Cable Insertion Loss and Crosstalk Reduction
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Solution Overview
Problem
Conventional electrical cables face challenges in achieving high-speed signal transmission with minimal interference and crosstalk, particularly in densely interconnected devices, due to limitations in shielding effectiveness and connector design.
Innovation Solution
The development of a shielded electrical cable with strategically arranged conductor sets, shielding films, and adhesive layers that provide optimal electrical isolation and reduced insertion loss, allowing for higher frequency ranges and lower crosstalk, while enabling mass termination techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional shielding designs are used, then shielding effectiveness is achieved, but insertion loss increases and signal integrity deteriorates at high frequencies
Solution Approach 1:
The continuous shielding layer is segmented into multiple discrete shielding segments along the cable length. Each segment is electrically isolated from adjacent segments by dielectric barriers, creating a series of distributed shielded sections that reduce signal reflection and standing wave effects while maintaining overall shielding effectiveness.
Solution Approach 2:
The shielding structure transitions from uniform to non-uniform, with varying shield density and configuration along different cable sections. High-frequency signal paths receive enhanced shielding with smaller segment spacing, while low-frequency paths use larger spacing, optimizing protection across the entire frequency spectrum without excessive insertion loss.
2Volume of moving object
If conductors are spaced closely to reduce cable size, then cable compactness improves, but crosstalk between conductors increases
Solution Approach 1:
Dielectric barriers and shielding segments are positioned between adjacent conductors to act as intermediaries that block electromagnetic coupling. These intermediate structures prevent direct field interaction between closely spaced conductors, enabling compact cable design while maintaining low crosstalk levels through the mediating shielding effect.
Solution Approach 2:
The shielding approach moves from two-dimensional planar shielding to three-dimensional distributed shielding segments positioned at multiple heights and locations around each conductor. This spatial distribution in multiple dimensions provides effective crosstalk suppression even when conductors are closely spaced in the primary cable cross-section.
3Reliability
If traditional connector designs are used, then connection reliability is maintained, but mass termination becomes difficult and connection site size increases
Solution Approach 1:
The cable design incorporates standardized, modular connector interfaces that can accommodate multiple conductor configurations and termination methods. The uniform shielding segment structure and conductor arrangement allow the same connector design to be used across different cable types and applications, enabling mass termination processes to efficiently connect multiple conductors simultaneously while maintaining reliable electrical connections.
Data Source
AI summary
A shielded electrical cable includes one or more conductor sets extending along a length of the cable and being spaced apart from each other along a width of the cable. Each conductor set has one or more conductors having a size no greater than 24 AWG and each conductor set has an insertion loss of less than about −20 dB/meter over a frequency range of 0 to 20 GHz. First and second shielding films are disposed on opposite sides of the cable, the first and second films including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second films in combination substantially surround each conductor set, and the pinched portions of the first and second films in combination form pinched portions of the cable on each side of each conductor.