High-Frequency Connector Shield Layout for Lower Near-End Crosstalk
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Solution Overview
Problem
High-speed electrical connectors face challenges in reducing near-end crosstalk between closely spaced signal conductors, particularly at higher frequencies, which affects signal integrity and performance.
Innovation Solution
The use of a conductive member with specific openings and tabs in an insulative shell, where the conductive member is positioned adjacent to the connector floor, reduces crosstalk by electrically connecting ground contacts and maintaining insulation from signal conductors, thereby minimizing interference between adjacent signal pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of signal conductors is increased to handle more data at higher speeds, then data transmission capacity is improved, but electrical interference and crosstalk between adjacent conductors worsens
Solution Approach 1:
A conductive member with a pattern of openings is positioned between adjacent signal conductors to act as a shield. The openings are configured to allow signal transmission while blocking electromagnetic interference. This intermediary structure reduces crosstalk between closely spaced conductors while maintaining high data transmission capacity.
Solution Approach 2:
The conductive member features a non-uniform pattern of openings with varying sizes, shapes, and distributions tailored to specific locations. This local customization optimizes signal integrity for each conductor pair while providing targeted shielding where crosstalk is most problematic, rather than using a uniform shielding approach throughout.
2Object-generated harmful factors
If shield members are added between signal conductors to reduce interference, then crosstalk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The conductive member integrates multiple functions into a single component: it provides electromagnetic shielding, maintains conductor spacing, and offers mechanical support. By combining these functions that would traditionally require separate components, the overall device complexity is reduced while still achieving effective crosstalk reduction.
Solution Approach 2:
The conductive member serves as a multi-functional element that simultaneously acts as a shield, a structural support, and a positioning fixture for the signal conductors. This universal component replaces what would otherwise require multiple separate parts, simplifying both the connector design and manufacturing process.
3Reliability
If shield members are added to reduce interference, then signal integrity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The conductive member is pre-configured with a predetermined pattern of openings and attachment features before assembly. This preliminary preparation ensures that when the connector is assembled, the shielding structure is already optimally positioned, reducing the need for complex real-time alignment procedures and lowering manufacturing precision requirements during final assembly.
Solution Approach 2:
The conductive member is divided into multiple sections or segments, each with its own pattern of openings tailored to specific conductor groups. This segmentation allows each section to be independently manufactured and positioned, simplifying the overall alignment process compared to manufacturing and positioning a single large complex shield structure.
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 near-end crosstalk by at least 2 dB over the frequency range from 5 to 28 GHz, enhancing signal integrity and performance in high-density, high-speed connectors.
Implementation Method 1
shield members are often placed between or around adjacent signal conductors. The shields may prevent signals carried on one conductor from creating 'crosstalk' on another conductor
Implementation Method 2
an insulative shell having a floor; a first plurality of contacts extending through the floor... a conductive member adjacent the floor
Data Source
AI summary
An electrical connector comprises an insulative shell having a floor; a first plurality of contacts extending through the floor, wherein the first plurality of contacts are disposed in a plurality of columns; a second plurality of contacts extending through the floor, wherein the second plurality of contacts are interspersed with the first plurality of contacts within the plurality of columns; and a conductive member adjacent the floor. The conductive member comprises a first plurality of openings, wherein the first plurality of contacts extend through the openings of the first plurality of openings; a second plurality of openings, wherein the second plurality of contacts extend through the openings of the second plurality of openings; and a first plurality of tabs, extending into openings in the insulative shell.