PCB Commoned Ground Plane for High-Speed Connector Signal Integrity
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Solution Overview
Problem
Existing electrical edge-card connector systems face challenges in maintaining signal integrity and managing resonance frequencies, particularly in high-speed electronic communications, due to inadequate electrical connection of ground contacts within the connectors.
Innovation Solution
The implementation of a substrate with electrically conductive ground traces and a ground coupling assembly that electrically connects ground traces while maintaining isolation from signal traces, using conductive bridges and microvias to enhance ground connectivity and reduce resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ground contacts are inadequately connected in existing electrical connectors, then device miniaturization and high-speed communication capabilities are limited, but adding proper ground connection structures increases device complexity
Solution Approach 1:
The patent transitions from planar ground traces on a single surface to a three-dimensional ground coupling assembly that extends vertically between opposite surfaces of the substrate. The ground plate disposed between first and second surfaces creates a volumetric ground path, adding a transverse dimension to ground connectivity and enabling improved RF performance without increasing lateral footprint.
Solution Approach 2:
The ground coupling assembly is nested within the substrate structure, with the ground plate positioned between the first and second surfaces of the substrate body. This nested configuration integrates the ground connection functionality within the existing connector housing volume, avoiding additional external components.
2Reliability
If ground traces are aligned with signal traces laterally, then ground connectivity is improved, but resonance frequencies decrease causing signal integrity issues
Solution Approach 1:
The patent resolves the resonance issue by moving the ground plate alignment from the lateral dimension to the transverse dimension. The ground plate is aligned with ground traces along the transverse direction (between surfaces) rather than laterally alongside signal traces. This dimensional shift maintains ground connectivity while increasing separation between ground and signal paths in the lateral plane, thereby reducing resonance coupling.
Solution Approach 2:
The ground plate acts as an intermediary ground connection structure that mediates between the need for ground connectivity and the need to avoid resonance. By providing a vertical ground path through the substrate thickness rather than a lateral ground path, the ground plate serves as an intermediate solution that satisfies both requirements.
3Reliability
If ground plate is positioned to align with ground traces, then ground connectivity is enhanced, but alignment with signal traces increases crosstalk and insertion loss
Solution Approach 1:
The patent positions the ground plate alignment in the transverse dimension (vertical between surfaces) rather than the lateral dimension (horizontal alongside traces). This dimensional repositioning allows the ground plate to align with and enhance ground trace connectivity while maintaining lateral separation from signal traces, thereby reducing crosstalk and insertion loss.
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 solution improves electrical performance by shifting resonance frequencies to higher frequencies, reducing insertion loss and crosstalk, and increasing usable bandwidth, thereby enhancing data transfer rates and connector reliability.
Implementation Method 1
The substrate can include an electrically conductive ground plate disposed between the first surface and the second surface. The ground plate can be aligned with the mating end of the at least one ground trace along the transverse direction
Data Source
AI summary
An electrical connector includes a substrate that includes a plurality of ground traces at first and second surfaces of the substrate, and a ground coupling assembly that couples pairs of ground traces at each of the first and second surfaces, and further couples the ground traces at the first surface to the ground traces at the second surface.