Ground Bus Shell Pockets for Cable Card Shielding and Assembly
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Solution Overview
Problem
The signal integrity and electrical performance of electrical connectors are compromised at the interface between cables and circuit cards due to the lack of effective shielding, leading to poor assembly efficiency and increased costs.
Innovation Solution
A cable card assembly that includes a circuit card with a ground plane, cables with signal conductors and cable shields, and a ground bus that is electrically connected to the cable shields and the circuit card's ground plane, forming a shell with pockets to receive the cables and providing enhanced shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple individual shields are provided for each cable at the circuit card interface, then shielding effectiveness is improved, but assembly time and manufacturing cost increase
Solution Approach 1:
Multiple individual cable shields are merged into a single common ground bus structure that serves all cables simultaneously. The ground bus integrates multiple grounding functions into one component, eliminating the need to assemble separate shields for each cable while maintaining comprehensive electromagnetic shielding coverage at the circuit card interface.
Solution Approach 2:
The ground bus performs multiple functions: it provides shielding for multiple cables, serves as a common ground reference, and facilitates simplified assembly. This multi-functional component replaces what would otherwise require multiple separate shielding components, reducing assembly complexity and time.
2Object-affected harmful factors
If multiple individual shields are provided for each cable at the circuit card interface, then shielding effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
Multiple individual cable shields are merged into a single common ground bus structure that serves all cables simultaneously. The ground bus integrates multiple grounding functions into one component, eliminating the need to assemble separate shields for each cable while maintaining comprehensive electromagnetic shielding coverage at the circuit card interface.
Solution Approach 2:
The ground bus performs multiple functions: it provides shielding for multiple cables, serves as a common ground reference, and facilitates simplified assembly. This multi-functional component replaces what would otherwise require multiple separate shielding components, reducing assembly complexity and time.
3Reliability
If the cable shield coverage is extended to the circuit card interface, then signal integrity is improved, but the complexity of the shielding structure increases
Solution Approach 1:
Multiple individual cable shields are merged into a single common ground bus structure that serves all cables simultaneously. The ground bus integrates multiple grounding functions into one component, eliminating the need to assemble separate shields for each cable while maintaining comprehensive electromagnetic shielding coverage at the circuit card interface.
4Object-affected harmful factors
If individual shields are assembled for each cable, then shielding effectiveness is improved, but the number of assembly steps increases
Solution Approach 1:
Multiple individual cable shields are merged into a single common ground bus structure that serves all cables simultaneously. The ground bus integrates multiple grounding functions into one component, eliminating the need to assemble separate shields for each cable while maintaining comprehensive electromagnetic shielding coverage at the circuit card interface.
Solution Approach 2:
The ground bus performs multiple functions: it provides shielding for multiple cables, serves as a common ground reference, and facilitates simplified assembly. This multi-functional component replaces what would otherwise require multiple separate shielding components, reducing assembly complexity and time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively shields the signal conductors at the interface with the circuit card, improving signal integrity and reducing assembly time and costs, while maintaining reliable electrical performance.
Implementation Method 1
The cables each have a signal conductor, or a differential pair of signal conductors surrounded by a shield layer that, in turn, is surrounded by a cable jacket. The shield layer includes a conductive foil, which functions to shield the signal conductor(s) from electromagnetic interference (EMI)
Implementation Method 2
The ground bus is electrically connected to the cable shields of the cables. The ground bus is electrically connected to the ground plane of the circuit card.
Data Source
AI summary
A cable card assembly includes a circuit card having an array of signal pads on a surface of the circuit card. Cables including signal conductors and cable shields are electrically connected to the circuit card. The cable card assembly includes a ground bus coupled to the circuit card electrically connected to the cable shields and a ground plane of the circuit card. The ground bus includes a shell to form pockets, arranged in multiple rows, which receive the corresponding cables. The shell includes solder standoff posts extending from an inner end of the shell that are terminated to the circuit card. The solder standoff post holds the inner end elevated from the surface of the circuit card.