Integrated Ground Bus Shielding for Cable Card Signal Integrity
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Solution Overview
Problem
Existing electrical connectors experience signal integrity and performance issues at the interface between cables and circuit cards due to inadequate shielding, which is time-consuming and costly to assemble.
Innovation Solution
An electrical connector design featuring a housing with a ground bus that provides continuous shielding for signal conductors by electrically connecting cable shields to a circuit card's ground plane, using a multipiece ground bus structure with tunnels to arrange cables in rows and columns, and compliant pins for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple shields are provided to cover the ends of the cables, then shielding effectiveness is improved, but assembly time increases and manufacturing cost increases
Solution Approach 1:
The patent combines multiple separate shields into a single integrated ground bus structure that provides continuous shielding along the entire cable length. The ground bus includes a continuous ground plane with side walls that collectively replace multiple discrete shields, reducing assembly steps while maintaining or improving EMI protection.
Solution Approach 2:
The ground bus serves multiple functions simultaneously: it provides electromagnetic shielding, acts as a mechanical support structure for the cables, and establishes a continuous ground reference plane. This multi-functionality eliminates the need for separate shielding components and reduces overall assembly complexity.
2Object-affected harmful factors
If multiple shields are provided to cover the ends of the cables, then shielding effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple separate shields into a single integrated ground bus structure that provides continuous shielding along the entire cable length. The ground bus includes a continuous ground plane with side walls that collectively replace multiple discrete shields, reducing assembly steps while maintaining or improving EMI protection.
Solution Approach 2:
The ground bus is formed as a single molded component with integrated shielding surfaces, eliminating the need for multiple separate shield pieces that would require additional fasteners, adhesives, and assembly operations. This single-component approach reduces both material and manufacturing costs.
3Reliability
If the cable shield no longer shields the exposed portions of the signal conductors at the interface, then signal integrity deteriorates, but assembly complexity increases
Solution Approach 1:
The ground bus is pre-configured with a continuous ground plane and integrated side walls that extend to cover the cable ends before assembly. This preliminary structure ensures that when cables are attached, they are automatically positioned within the shielded enclosure, maintaining signal integrity without requiring additional shielding steps during assembly.
Solution Approach 2:
The ground bus acts as an intermediary structure between the cable shields and the circuit board ground plane. It provides a continuous conductive path that extends the shielding effect from the cable onto the circuit board, eliminating the shielding gap at the interface without requiring complex multi-component assemblies.
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
Enhances signal integrity and reduces assembly time and cost by providing effective shielding and secure mounting, improving electrical performance and reducing cross-talk.
Implementation Method 1
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. The shell extends between the opening at the mating end of the housing to the cable exit port at the cable end of the housing to provide shielding between the cables within the cavity of the housing.
Data Source
AI summary
An electrical connector includes a housing that has walls forming a cavity, a cable exit port at a cable end of the housing, and an opening at a mating end of the housing. The electrical connector includes a cable card assembly received in the cavity of the housing. The cable card assembly includes a circuit card, cables terminated to the circuit card, and a ground bus coupled to the circuit card. The cables configured to exit the housing through the cable exit port. The ground bus is electrically connected to the cable shields and the ground plane of the circuit card. The ground bus includes a shell forming tunnels receiving the corresponding cables. The tunnels are stacked to arrange the cables in multiple rows. The shell extends between the opening at the mating end of the housing to the cable exit port at the cable end of the housing to provide shielding between the cables within the cavity of the housing.