Contact Assembly Ground Structure Impedance Mismatch
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Solution Overview
Problem
The termination of the ground structure in existing electrical connectors leads to impedance mismatch and reduced performance due to ineffective shielding against electromagnetic interference.
Innovation Solution
The implementation of a contact assembly with interspersed signal and ground contacts, where ground contacts are electrically connected to a separate ground bus, and drain wires are used to common the ground shields, providing improved electrical shielding and reducing impedance mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground structure termination is implemented in conventional electrical connectors, then electrical connection is achieved, but impedance mismatch occurs and performance is reduced
Solution Approach 1:
The ground structure is segmented into multiple discrete ground contacts interspersed among signal contacts, with a separate ground bus that is discrete from the leadframe. This segmentation allows for optimized impedance control and reduced interference compared to conventional integrated ground structures.
Solution Approach 2:
A separate ground bus acts as an intermediary element, discrete from the leadframe, to provide a dedicated ground path. This intermediary structure enables independent optimization of ground connections and improves overall signal integrity by isolating ground returns from signal paths.
2Object-affected harmful factors
If ground contacts are interspersed with signal contacts, then electrical shielding is improved, but device complexity increases
Solution Approach 1:
Ground contacts are locally positioned interspersed among signal contacts at specific locations where electromagnetic shielding is most needed. This local placement strategy provides targeted EMI protection without requiring complete restructuring of the entire contact array.
Solution Approach 2:
The interspersed ground contacts serve multiple functions: providing electromagnetic shielding, establishing reference planes for impedance control, and offering additional ground return paths. This multi-functionality reduces the need for separate shielding structures.
3Reliability
If drain wires are terminated to ground contacts, then ground shielding effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
Drain wires are terminated to ground contacts to establish equipotential regions, ensuring that the shield and ground structure are at the same electrical potential. This equipotential connection enhances shielding effectiveness by preventing potential differences that could cause interference.
Solution Approach 2:
The termination process merges multiple ground connections (drain wires, ground contacts, and ground bus) into a unified ground system. This combining approach simplifies the overall grounding strategy while maintaining effective shielding across all cable connections.
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
This configuration enhances the electrical connector's performance by effectively shielding signal conductors, reducing cross-talk, and improving signal integrity at high data transfer speeds.
Implementation Method 1
The ground contacts are interspersed with the signal contacts to provide electrical shielding between corresponding signal contacts
Implementation Method 2
a ground shield surrounding the corresponding signal conductors to provide electrical shielding for the signal conductors
Implementation Method 3
The contact holder is a dielectric material. The contact holder holds each of the signal intermediate portions and holds each of the ground intermediate portions
Data Source
AI summary
A contact assembly includes a leadframe having signal contacts and ground contacts including intermediate portions extends between mating ends and terminating ends. The contact assembly includes a contact holder holding the intermediate portions. The contact assembly includes cables terminated to the leadframe having signal conductors held by insulators and ground shields surrounding the signal conductors to provide electrical shielding and drain wires electrically connected to the ground shields. The signal conductors are terminated to terminating ends of corresponding signal contacts. The drain wires are terminated to terminating ends of ground contacts to electrically common the ground shields and the ground contacts of the leadframe. The contact assembly includes a ground bus separate and discrete from the leadframe terminated to each of the ground contacts to electrically common the ground contacts.