Card Edge Connector Common Grounding Shield Crosstalk Reduction
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Solution Overview
Problem
Existing card edge connectors experience significant crosstalk interference due to close spacing of terminals, which affects high-frequency signal transmission, and existing grounding solutions are inadequate in maintaining effective contact over time.
Innovation Solution
A card edge connector design featuring an insulative housing with conductive terminals and a common grounding shield, where grounding elastic arms elastically contact ground terminals, enhancing grounding characteristics and maintaining stable shielding effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If terminals are spaced closely to reduce connector size, then device compactness is improved, but crosstalk between signal lines increases due to inductance and capacitance coupling
Solution Approach 1:
A grounding shield is introduced as an intermediary element positioned between adjacent signal terminals. This grounding shield acts as a mediator that intercepts and redirects electromagnetic fields, preventing direct coupling between signal lines. The grounding shield is connected to ground through elastic arms that maintain reliable electrical contact, thereby eliminating the harmful crosstalk while allowing terminals to remain closely spaced for compact connector design.
2Object-generated harmful factors
If a grounding shield is added to improve grounding characteristics, then crosstalk reduction is improved, but device complexity increases
Solution Approach 1:
The grounding shield is constructed as a thin film structure that is folded and configured to fit within the connector housing. This thin film approach maintains effective grounding coverage while minimizing the volume and structural complexity. The flexible nature of the thin film allows it to be positioned effectively between terminals without requiring complex rigid support structures.
Solution Approach 2:
The grounding shield is nested within the connector housing and terminal assembly. The elastic arms of the grounding shield are positioned to contact the outer casing and ground terminals, with the shielding elements arranged in a nested configuration that maximizes grounding effectiveness while minimizing the overall structural footprint and complexity.
3Reliability
If elastic arms are used to maintain contact between grounding shield and terminals, then contact reliability is improved, but elastic fatigue over time reduces grounding effectiveness
Solution Approach 1:
Multiple elastic arms are merged into a unified grounding shield structure, where the arms work collectively to maintain grounding contact. This distributed elastic arm configuration ensures that if one arm experiences fatigue or deformation, other arms continue to provide effective grounding contact, thereby extending the overall service life and maintaining reliability over time.
Solution Approach 2:
The elastic arms are designed with optimized material properties and geometric parameters to balance elasticity and durability. By carefully selecting the elastic modulus, arm thickness, and length parameters, the design achieves sufficient elastic force for reliable contact while minimizing stress concentrations that would lead to premature fatigue failure, thereby extending service life.
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 design significantly reduces crosstalk by ensuring reliable and firm contact between ground terminals and the mating object, thereby improving the transmission of high-frequency signals.
Implementation Method 1
each grounding elastic arm has an elastic portion extending upwardly from the sheet and an abutting portion extending upwardly from the elastic portion, the abutting portion elastically abuts against a facing outer side surface of the elastic arm portion of the corresponding ground terminal
Data Source
AI summary
A card edge connector comprises an insulative housing and at least one terminal module. The insulative housing has an elongated shape and is formed with a card edge slot and a terminal retention base mounting groove communicating with the card edge slot. The terminal module comprises a terminal retention base mounted in the terminal retention base mounting groove and at least one row of conductive terminals which are fixed to the terminal retention base side by side, the plurality of the conductive terminals comprises ground terminals, each conductive terminal has a fixed portion fixed to the terminal retainer and an elastic arm portion extending from the fixed portion into the card edge slot. The terminal module further comprises a common grounding shield, the common grounding shield comprises a sheet provided on the terminal retainer and a plurality of grounding elastic arms extending from the sheet.