Header Assembly Contact Module Shielding Design
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Solution Overview
Problem
Electrical connector assemblies suffer from signal degradation, cross-talk, and insertion loss due to geometrical issues and shielding gaps, and are costly to manufacture, particularly with plated plastic shells for 360° shielding.
Innovation Solution
The design incorporates a header assembly with contact modules featuring a signal leadframe and dielectric frame, along with ground shields and shrouds that provide electrical shielding, and a varying shroud cavity depth for improved signal integrity and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plated plastic shells are used to provide 360° shielding for each pair of signal contacts, then electrical shielding performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the shielding structure into separate ground shrouds for each contact module rather than using a single integrated plated plastic shell. Each ground shroud is a discrete component that can be manufactured and assembled independently, reducing overall manufacturing complexity and cost while maintaining shielding effectiveness.
Solution Approach 2:
The patent replaces expensive plated plastic shells with simpler, less costly ground shroud structures. These ground shrouds achieve the necessary shielding function without requiring the expensive plating process and complex mold tooling associated with plated plastic shells.
2Device complexity
If gaps or spaces are present in shielding through the connector assembly, then manufacturing complexity is reduced, but connector performance deteriorates due to reduced shielding
Solution Approach 1:
The ground shrouds provide localized shielding at critical positions where signal contacts are most vulnerable to interference. Rather than attempting continuous 360° shielding throughout the entire connector assembly, the patent applies shielding selectively at the contact module level where it is most needed, maintaining performance while reducing complexity.
Solution Approach 2:
The patent implements partial shielding through ground shrouds that cover the critical signal paths without requiring complete enclosure of all components. This partial action approach provides sufficient shielding for high-speed signals while avoiding the complexity of full 360° shielding throughout the entire assembly.
3Ease of manufacture
If contact modules use uniform contact lengths, then manufacturing is simplified, but electrical skew increases due to different signal path lengths
Solution Approach 1:
The signal leadframes are designed with locally varied lengths to compensate for different signal path lengths. Contacts serving longer signal paths are extended relative to those with shorter paths, ensuring that all signals arrive at the receptacle simultaneously. This localized adjustment maintains electrical synchronization without requiring complete redesign of the entire contact module structure.
Data Source
AI summary
A header assembly includes a header housing and contact modules coupled to the header housing each having a frame assembly with a signal leadframe and a dielectric frame. The dielectric frame includes mating portion extensions at a front of the dielectric frame. The signal leadframe includes mating portions extending forward from the mating portion extensions. Each contact module includes a ground shield having ground shrouds providing electrical shielding for the mating portions. Each ground shroud includes shroud walls forming a shroud cavity receiving the corresponding mating portion extension. Each ground shroud includes a shroud transition to vary a depth of the shroud cavity along a length of the ground shroud.