Backplane Connector Shielding for 90-Degree High-Speed Links
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Solution Overview
Problem
Existing backplane connectors face challenges in maintaining signal integrity at high data rates due to signal reflections and losses, particularly in orthogonal configurations where intermediary adaptors are used for 90-degree rotations, which are less desirable.
Innovation Solution
A connector system with a first right-angle connector and a second right-angle connector featuring a 90-degree twist, incorporating U-shaped ground shields to provide three-sided shielding for signal terminals, eliminating the need for intermediary connectors and enhancing signal integrity and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If intermediary adaptors are used for 90-degree rotation in orthogonal configurations, then mechanical connection is achieved, but signal integrity deteriorates due to signal reflections and losses
Solution Approach 1:
The patent removes the intermediary adaptor component entirely from the connector system. By integrating the 90-degree rotation capability directly into the connector housing and contact structure, the design eliminates the additional mating interface that causes signal reflections and losses, thereby maintaining signal integrity while achieving the required mechanical connection.
Solution Approach 2:
The patent combines the functions of the adaptor and the connector into a single integrated structure. The connector housing incorporates the 90-degree rotation feature, and the contact structure is designed to achieve proper alignment without requiring a separate adaptor piece, thus eliminating harmful additional interfaces.
2Reliability
If ground shields are added to each signal terminal pair, then signal integrity improves through shielding, but device complexity increases
Solution Approach 1:
The patent divides the shielding function into segmented U-shaped ground shields that are positioned between adjacent signal terminal pairs. Each U-shaped shield provides localized shielding for its corresponding signal pair, creating discrete shielding zones that reduce crosstalk and signal interference while maintaining a manageable structural complexity.
Solution Approach 2:
The patent applies shielding selectively at specific locations where it is most needed - between adjacent signal terminal pairs that are susceptible to crosstalk. The U-shaped ground shields are positioned locally at critical interfaces rather than providing uniform shielding throughout the entire connector, optimizing signal integrity while minimizing added complexity.
Data Source
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AI summary
A backplane connector includes a shielded design that has wafers with signal terminals supported as edge-coupled terminal pairs for differential signaling. A ground shield is mounted on each wafer and provides a U-channel that partially shields each terminal pair. The wafers omit a ground terminal between adjacent terminal pairs. An insert can be provided to help connect the ground shield to a U-shield to provide U-shaped shielding structure substantially the entire way from a tail to a contact.