Backplane Connector Matrix with Ground Shields
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Solution Overview
Problem
Existing backplane connector systems face challenges in increasing speed and density while minimizing signal interference and crosstalk, particularly at high frequencies, due to the limitations in spacing and arrangement of electrical terminals.
Innovation Solution
The development of high-speed backplane connector systems that incorporate a matrix arrangement of vias and signal pins, with ground shields and ground tabs to encapsulate electrical connector pairs in a three-dimensional manner, reducing unwanted signal propagation and crosstalk by maintaining uniform impedance and minimizing air gaps between components.
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 per unit area increases, but signal interference and crosstalk increase
Solution Approach 1:
Ground shields and ground tabs are introduced as intermediary elements between adjacent signal pins. These ground structures act as mediators that block electromagnetic field coupling between neighboring signal terminals, thereby reducing crosstalk while allowing high pin density. The ground shields are positioned between signal pins on the same layer, and ground tabs extend between adjacent layers to provide continuous shielding.
Solution Approach 2:
The shielding approach transitions from two-dimensional planar grounding to three-dimensional multi-layer shielding. Ground shields are implemented on multiple PCB layers with vertical ground tabs connecting them, creating a 3D ground cage around signal pins. This dimensional extension provides more effective electromagnetic isolation in the vertical dimension while maintaining horizontal pin density.
2Object-generated harmful factors
If ground shields are added between signal pins to reduce crosstalk, then signal interference is minimized, but device complexity increases
Solution Approach 1:
The ground shields and ground tabs serve multiple functions simultaneously: they provide crosstalk reduction between adjacent signal pins, establish reference planes for impedance control, and create Faraday cage effects for electromagnetic shielding. This multi-functionality reduces the need for separate shielding structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The grounding system merges multiple grounding functions into a unified structure. Ground shields on different layers are connected through ground tabs to form an integrated ground network that provides both lateral and vertical shielding. This merging eliminates the need for separate shielding mechanisms and simplifies the overall connector design.
3Reliability
If the number of ground structures is increased to maintain uniform impedance, then signal integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The ground shielding system is segmented into discrete ground shields on individual PCB layers, connected by ground tabs. This segmentation allows each ground shield to be independently designed and positioned to provide localized impedance control and shielding where needed, while the modular structure simplifies manufacturing compared to a monolithic ground structure.
Data Source
AI summary
A substrate is disclosed that is configured to receive an electrical component. The substrate comprises a plurality of first vias and a plurality of second vias. The plurality of first vias is arranges in the substrate in a matrix of rows and columns and is configured to provide mounting of the electric component, each first via associated with one of its closest neighbor first via to form a pair. The plurality of second vias is capable of being electrically commoned to one another and is positioned amongst the plurality of first vias such that there is at least one second via positioned directly between each first via and any of the closest non-pair first via neighbors.