Ground Clip Cable Assembly for Dense High-Speed Connector Routing
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Solution Overview
Problem
Conventional communication systems face challenges in achieving high electrical performance due to long electrical paths on circuit boards, signal losses between connector interfaces, and ineffective grounding structures, particularly at higher frequencies, while also struggling with cable density and spacing limitations.
Innovation Solution
A cable assembly with a ground clip or ground rake structure that includes a cable shield, drain wires, and a ground hood to support cables relative to a circuit card, providing improved electrical connectivity and grounding, allowing for increased cable density and reduced signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional cable termination techniques are used, then cable routing is simple, but cable density and contact pad spacing are limited
Solution Approach 1:
The grounding structure is segmented into multiple functional components: ground clips for individual cable shielding, drain wires for distributed grounding connections, and ground rakes with multiple tines for simultaneous contact with multiple ground pads. This segmentation allows each component to address specific grounding needs while enabling higher cable density through optimized spatial arrangement.
Solution Approach 2:
The grounding structure transitions from planar two-dimensional grounding to three-dimensional multi-level grounding. Ground clips extend vertically from the circuit board surface, drain wires provide lateral grounding paths, and ground rakes incorporate multiple tines at different heights and angles. This dimensional expansion enables effective grounding for densely packed cables without increasing footprint area.
2Volume of moving object
If cable spacing is reduced to increase density, then system size decreases, but signal integrity and grounding effectiveness deteriorate
Solution Approach 1:
The grounding structure implements local quality optimization by providing customized grounding solutions for different cable positions and frequencies. Ground clips are positioned individually for each cable, drain wires are distributed along cable lengths, and ground rakes feature tines of varying lengths and orientations. This localized approach ensures optimal grounding effectiveness for each cable regardless of density, maintaining signal integrity even in compact arrangements.
Solution Approach 2:
Drain wires serve as intermediary elements between the cable shields and the ground clips/rakes. These drain wires provide dedicated low-impedance grounding paths that mediate the connection between high-frequency signal paths and the reference plane, effectively isolating signal integrity from the effects of reduced cable spacing.
3Ease of manufacture
If grounding structure is simplified, then manufacturing is easier, but grounding effectiveness at high frequencies is insufficient
Solution Approach 1:
The grounding structure employs a nested configuration where ground clips are mounted on the circuit board, drain wires are attached to and extend from the clips, and ground rakes with multiple tines are positioned around the cables. This nested arrangement consolidates multiple grounding functions into a compact integrated structure that maintains high-frequency effectiveness while simplifying assembly through hierarchical integration.
Solution Approach 2:
The grounding structure incorporates dynamic elements including flexible drain wires that can accommodate cable positioning variations, and ground rakes with tines designed to flexibly contact ground pads. This dynamic capability ensures reliable grounding effectiveness across manufacturing tolerances and assembly variations without requiring overly complex precision mechanisms.
Data Source
AI summary
A cable assembly includes a cable having signal conductors and a cable shield. The cable may have drain wires at sides of the cable. A ground clip is coupled to the end of the cable having a window that receives the exposed portions of the signal conductors therethrough. The ground clip is coupled to the circuit card to support the cable relative to the circuit card. The ground clip includes a lower grounding tab electrically connected to a lower portion of the cable shield and an upper grounding tab electrically connected to an upper portion of the cable shield. The ground clip includes connecting tines electrically connected to sides of the cable shield, such as via the drain wires.