Floating Image Plane PCB for Crosstalk Reduction
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Solution Overview
Problem
Crosstalk and return loss issues in high-speed communications systems due to the proximity of conductors and contact structures in plug-jack connectors, leading to noise interference and impedance mismatches, which are exacerbated by the industry-standardized connector configurations.
Innovation Solution
The use of a printed circuit board with floating image planes that are electrically isolated from conductive paths, positioned to alter impedance and reduce crosstalk between differential transmission lines, and act as common mode filters to improve signal integrity and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conductors and contact structures are positioned in close proximity in plug-jack connectors, then connector size and complexity are reduced, but crosstalk and noise interference increase
Solution Approach 1:
The patent introduces floating image planes as intermediary conductive structures positioned between differential transmission lines. These image planes act as mediators that manipulate electromagnetic field distribution to reduce crosstalk and noise interference while allowing conductors to remain in close proximity, thus resolving the contradiction between compact connector design and signal integrity.
Solution Approach 2:
The patent modifies the electromagnetic environment by introducing floating image planes that change the impedance characteristics and field distribution parameters. By adjusting the position, size, and electrical characteristics of these image planes, the patent optimizes signal integrity without requiring increased physical separation between conductors, thereby maintaining compact connector design.
2Ease of manufacture
If conductors are positioned in close proximity in plug-jack connectors, then manufacturing and assembly are simplified, but return loss and impedance mismatch increase
Solution Approach 1:
The floating image planes serve as intermediary elements that enable close conductor positioning while maintaining proper impedance control. These image planes provide a controlled electromagnetic environment that ensures consistent return loss characteristics without complicating the manufacturing process or requiring additional assembly steps.
Solution Approach 2:
The patent addresses impedance control by adding structures in a different spatial dimension (floating image planes positioned between conductive layers) rather than increasing horizontal separation. This dimensional approach maintains the simplicity of planar conductor routing while achieving proper impedance matching and reduced return loss through vertical field management.
3Ease of operation
If standard industry connector configurations are used, then compatibility and ease of operation are maintained, but crosstalk and noise interference are exacerbated
Solution Approach 1:
The patent maintains standard industry connector configurations and contact assignments for compatibility, but introduces floating image planes at specific locations between differential pairs. This local modification approach preserves overall connector compatibility and ease of operation while locally addressing crosstalk and noise interference problems in high-frequency signal paths.
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
The solution effectively reduces crosstalk and improves return loss and insertion loss performance by controlling impedance and physical isolation between differential transmission lines, enhancing the overall signal quality in communications connectors.
Implementation Method 1
positioned to alter impedance and reduce crosstalk between differential transmission lines
Implementation Method 2
act as common mode filters to improve signal integrity and balance
Data Source
AI summary
Communications connectors include a housing and a printed circuit board that is at least partially mounted in the housing that has a plurality of conductive paths that are arranged in pairs to form a plurality of differential transmission lines. These connectors further include a plurality of contacts, each of which is electrically connected to a respective one of the conductive paths of the printed circuit board. The printed circuit board further includes at least a first floating image plane that is located between a top surface and a bottom surface thereof, the floating image plane being electrically isolated from the plurality of conductive paths.