Backplane Connector Ground Shields for Crosstalk Reduction
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Solution Overview
Problem
Current backplane connector systems face challenges in achieving high-speed operations and increased pin densities while minimizing signal interference and crosstalk, particularly as electronic components become smaller and more complex.
Innovation Solution
The development of high-speed backplane connector systems that incorporate C-shaped ground shields and ground tabs to surround signal pin pairs, along with a header module design that includes identical geometry for connector pairs to prevent longitudinal mode propagation and reduce crosstalk, utilizing dielectric fillers to encapsulate electrical connectors in a three-dimensional manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the spacing between electrical terminals is reduced to increase pin density, then the number of electrical terminals increases, but signal interference and crosstalk increase
Solution Approach 1:
Ground shields are introduced as intermediary elements positioned between adjacent signal pin pairs. These ground shields act as mediators that electrically isolate the signal pins from each other, preventing crosstalk and signal interference while allowing the pins to be closely spaced for high density connectivity
Solution Approach 2:
The connector structure is segmented into isolated units by introducing ground shields between signal pin pairs. This segmentation divides the continuous signal path into discrete, electrically isolated segments, allowing each signal pair to operate independently without interfering with adjacent pairs, thereby enabling higher pin density without increased crosstalk
2Quantity of substance
If the spacing between electrical terminals is reduced to increase pin density, then the number of electrical terminals increases, but insertion loss increases
Solution Approach 1:
The physical parameters of the connector are optimized by controlling the dimensions, positioning, and geometry of ground shields and signal pins. By carefully adjusting these parameters, the electromagnetic field distribution is optimized to minimize signal energy loss while maintaining high pin density, thereby reducing insertion loss despite reduced spacing between terminals
3Quantity of substance
If the spacing between electrical terminals is reduced to increase pin density, then the number of electrical terminals increases, but return loss increases
Solution Approach 1:
The geometric parameters of ground shields and signal pins are optimized to maintain proper impedance matching. By controlling the dimensions and spacing parameters, the electromagnetic characteristics are tuned to minimize signal reflections and return loss, enabling high pin density while maintaining signal integrity
4Object-affected harmful factors
If ground shields are added to surround signal pin pairs to reduce crosstalk, then signal interference is reduced, but device complexity increases
Solution Approach 1:
Multiple ground shields are merged into a continuous ground structure that spans across multiple signal pin pairs. This combining approach reduces the total number of discrete ground shield components while maintaining the crosstalk isolation function, thereby simplifying the overall device structure while still achieving the desired reduction in signal interference
Data Source
AI summary
High-speed backplane connectors systems for mounting a substrate that are capable of operating at speeds of up to at least 25 Gbps, while in some implementations also providing pin densities of at least 50 pairs of electrical connectors per inch are disclosed. Implementations of the high-speed connector systems may provide ground shields and/or ground structures that substantially encapsulate electrical connector pairs, which may be differential electrical connector pairs, in a three-dimensional manner throughout a backplane footprint, a backplane connector, and a daughtercard footprint. These encapsulating ground shields and/or ground structures prevent undesirable propagation of non-traverse, longitudinal, and higher-order modes when the high-speed backplane connector systems operates at frequencies up to at least 30 GHz.