PCB Connector Shielding Modules for Differential Signal Crosstalk
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Solution Overview
Problem
Existing printed circuit board connectors fail to effectively transmit differential signal voltages between PCBs with low crosstalk while maintaining high signal integrity and density, especially when PCBs are arranged at right angles.
Innovation Solution
The connector design features disc-shaped modules with signal and shielding contacts arranged in alternation, where signal modules are symmetrically positioned and connected asymmetrically, with shielding modules inserted between signal pairs to provide effective shielding and reduce interference radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding plates are arranged between differential signal contacts to reduce crosstalk, then signal integrity is improved, but device complexity increases
Solution Approach 1:
The connector is divided into alternating signal modules and shielding modules, each containing 2 contacts. This segmentation allows shielding elements to be strategically positioned between signal pairs without requiring a completely redesigned connector structure, thereby improving signal integrity while maintaining manageable complexity
Solution Approach 2:
The shielding contact and insulating body are merged into an integrated shielding module, where the insulating body serves both as structural support and as part of the shielding mechanism. This combining reduces the number of separate components needed, offsetting the complexity increase from adding shielding functionality
2Object-affected harmful factors
If multiple shielding modules are inserted between signal modules to separate differential signal pairs, then crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The connector is segmented into standardized signal modules and shielding modules that can be manufactured separately and then assembled by simple insertion. This modular segmentation reduces manufacturing complexity compared to creating a completely integrated structure, as each module can be produced using similar processes and then combined
Solution Approach 2:
The shielding modules serve multiple functions: they provide electromagnetic shielding between signal pairs, provide structural support for the connector housing, and define the mechanical insertion path for PCB contacts. This multi-functionality reduces the total number of separate components needed, simplifying the overall manufacturing process
3Adaptability or versatility
If signal modules are arranged with alternating connection ends offset by material thickness, then PCB routing flexibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
Adjacent signal modules are designed with asymmetric offset patterns, where modules are rotated 180° relative to each other and connection ends are offset by the material thickness of connection ends. This asymmetric design provides varied routing options for PCB traces while the precise offset distance (equal to material thickness) can be controlled during manufacturing to maintain alignment tolerances
Solution Approach 2:
The offset pattern is applied locally to alternating signal modules rather than uniformly to all modules. This allows different regions of the connector to have different connection end positions, providing routing flexibility for different PCB layouts while maintaining consistent manufacturing tolerances within each local module type
Data Source
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AI summary
For the transmission of differential signals between two printed circuit boards, a printed circuit board connector (1) is proposed, consisting of an insulating connector housing (2) and disc-shaped modules (10, 20) arranged therein, in which electrical contact elements (11, 21) are arranged, wherein modules having signal contacts are arranged alternately next to modules having shield contacts. The shielding module (20) is designed such that even signal contact pairs arranged one above the other are at least partially shielded from each other.