Shielded Connector Grounding Structure for High-Speed Crosstalk Control
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Solution Overview
Problem
Existing connectors suffer from signal crosstalk and crosstalk resonance due to low conductivity of conductive plastics and open-circuit suspension grounding structures, particularly at high transmission rates above 28 Gb/s.
Innovation Solution
A connector design featuring electrically conductive shielding sheets with support feet on both sides of transmission lines, forming electrical paths through a main body part to ground pins, reducing inductance effects and preventing signal crosstalk resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic shielding sheet is used in a suspension grounding manner, then signal current reference return is implemented, but the open-circuit form causes low-band signal crosstalk resonance and crosstalk risk at 28 Gb/s or above
Solution Approach 1:
The shielding sheet is divided into multiple segments with support feet positioned at different locations. Each support foot creates a separate grounding connection point, segmenting the shielding structure to reduce resonance while maintaining reference return capability
Solution Approach 2:
The shielding sheet transitions from a traditional planar suspension grounding structure to a three-dimensional configuration with support feet extending perpendicular to the shielding sheet plane, creating multiple grounding paths and reducing crosstalk resonance
2Object-affected harmful factors
If conductive plastic is used for shielding, then isolation of signal crosstalk is achieved, but the comparatively low electric conductivity results in poor signal crosstalk avoidance effect for high-speed connector
Solution Approach 1:
The connector employs a composite shielding structure combining metallic shielding sheet with conductive plastic materials. The metallic sheet provides primary shielding with high conductivity, while the conductive plastic supplements the shielding effect and provides additional isolation, achieving both mechanical support and electromagnetic interference protection
3Object-affected harmful factors
If support feet are added to connect shielding sheet to ground pins, then inductance effect is reduced and crosstalk resonance is prevented, but device complexity increases
Solution Approach 1:
The support feet are integrated with the shielding sheet as a unified structure rather than separate components. The support feet are formed as extensions of the shielding sheet itself, combining the shielding function and grounding support function into a single integrated component, thus reducing overall device complexity while achieving crosstalk resonance prevention
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 enhances signal integrity and reliability by minimizing crosstalk resonance, ensuring high-speed signal transmission without significant interference.
Implementation Method 1
the shielding sheet is electrically conductive, the shielding sheet includes a main body part, at least one first support foot, and at least one second support foot... the first support foot is fastened to the ground pin, the second support foot is also fastened to the ground pin, and the main body part is spaced apart from the plurality of transmission lines
Data Source
AI summary
This application relates to a connector, including a plurality of transmission lines and at least one shielding sheet. The plurality of transmission lines are arranged at an interval in a first direction. An extension direction of each transmission line intersects with the first direction. The plurality of transmission lines include at least one ground pin. The shielding sheet is electrically conductive, and includes a main body part, at least one first support foot, and at least one second support foot. The main body part extends along the first direction, and spans the plurality of transmission lines from one side of the transmission lines to the other side of the transmission lines. The first support foot and the second support foot are respectively disposed on two sides of the main body part. The first support foot and the second support foot are separately connected to the ground pin fixedly.