Hybrid Shield Design for Crosstalk Reduction in High-Speed Connectors
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Solution Overview
Problem
High-speed electrical connectors face challenges in reducing crosstalk and maintaining impedance control due to close proximity of conductors, leading to increased electromagnetic interference and noise, especially at higher frequencies.
Innovation Solution
The use of a hybrid shield comprising lossy and conductive materials strategically positioned within the connector to dissipate electromagnetic energy and reduce crosstalk, where the lossy material has a bulk conductivity between 10 siemens/meter and 100 siemens/meter, and the conductive material is thin enough to maintain mechanical integrity without significant impedance alteration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal shields are placed between adjacent signal conductors to reduce crosstalk, then electromagnetic interference is reduced, but the impedance of conductors is altered and device complexity increases
Solution Approach 1:
The patent applies composite materials by combining lossy dielectric material with conductive material in a hybrid shield structure. The lossy dielectric portion absorbs electromagnetic energy to reduce crosstalk, while the conductive material portion provides shielding without significantly altering impedance. This composite approach allows the shield to perform multiple functions (crosstalk reduction and impedance control) simultaneously, resolving the contradiction between reducing electromagnetic interference and maintaining simple device structure.
2Object-affected harmful factors
If conductors are spaced further apart to reduce crosstalk, then electromagnetic interference decreases, but connector density and productivity are reduced
Solution Approach 1:
The patent introduces a lossy dielectric material as an intermediary substance positioned between adjacent signal conductors. This material absorbs electromagnetic energy and dissipates it, acting as a mediator that reduces crosstalk without requiring increased spacing between conductors. By placing this intermediary lossy material in the gaps between conductors, the patent enables high-density conductor arrangement while maintaining low crosstalk levels, thus resolving the contradiction between connector density and electromagnetic interference reduction.
3Object-affected harmful factors
If thick conductive material is used for shielding, then crosstalk reduction is improved, but mechanical integrity is compromised and impedance changes
Solution Approach 1:
The patent uses composite materials where a thin layer of conductive material is applied over or combined with lossy dielectric material. The conductive material provides necessary electromagnetic shielding to reduce crosstalk, while the lossy dielectric substrate provides mechanical strength and structural support. This composite structure allows the use of thin conductive material that maintains mechanical integrity while still achieving effective crosstalk reduction, resolving the contradiction between shielding performance and mechanical strength.
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 effectively reduces crosstalk to less than −50 dB across a desired frequency range, such as 1 GHz to 20 GHz, while maintaining signal integrity and mechanical stability, even in high-density connectors with close conductor spacing.
Implementation Method 1
the lossy material has a bulk conductivity between 10 siemens/meter and 100 siemens/meter... effectively reduces crosstalk to less than −50 dB across a desired frequency range
Implementation Method 2
the conductive material is thin enough to maintain mechanical integrity without significant impedance alteration
Data Source
AI summary
An electrical connector with reduced cross talk and controlled impedance. The connector comprises hybrid shields with lossy portions and conductive portions. The synergistic effect of the lossy portions and the conductive portions allows the hybrid shields to be relatively thin such that they can be incorporated into the mating interface regions or other mechanically constrained regions of the connector to provide adequate crosstalk suppression without undesirably impacting impedance. The conductive portions may be shaped to preferentially position the conductive regions adjacent signal conductors susceptible to cross talk to further contribute to the synergy. The conductive regions may include holes to contribute to desired electrical properties for the connector.