Connector Wipe Geometry for Stub Reflection Reduction
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Solution Overview
Problem
Existing connector wipes in information handling systems cause signal integrity issues due to impedance mismatches and stub reflections, leading to degraded performance in signal transmission.
Innovation Solution
Implementing a wider section in the connector wipe with a lower impedance and utilizing a dielectric material with a lower dielectric constant below the wipe to create an impedance mismatch, along with grooves or ferrite coating to minimize stub reflections and enhance signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connector wipe is used to provide electrical connection and shielding, then connection reliability is improved, but impedance mismatch and stub reflections occur causing signal integrity degradation
Solution Approach 1:
The connector wipe is divided into multiple sections with different widths along its length. The first section has a first width and the second section has a second width that is different from the first width. This segmentation creates multiple impedance zones along the wipe, allowing the structure to maintain connection reliability while managing stub reflections through controlled impedance transitions.
Solution Approach 2:
Different portions of the connector wipe are given different local properties through varying widths. The first section and second section have different widths to create locally different impedance characteristics. This allows each section to serve its specific function - the first section providing initial connection and the second section managing reflections - thereby improving overall signal integrity while maintaining reliability.
2Object-generated harmful factors
If the connector wipe is made wider to reduce stub length, then signal integrity is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of making the entire wipe uniformly wider, the structure is segmented into multiple sections with different widths. The first section has a first width and the second section has a second width. This segmentation allows stub length reduction in critical areas while maintaining manufacturability in other areas, thereby reducing overall manufacturing complexity compared to a uniformly wide design.
Solution Approach 2:
The width parameter of the connector wipe is changed along its length rather than being uniform. The first section has a first width and the second section has a second width that is different. This parameter change allows optimization of stub length in specific regions while keeping the overall structure simple and easy to manufacture, resolving the contradiction between signal integrity and manufacturing complexity.
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 improves signal integrity by reducing stub reflections and increasing resonance frequency, resulting in optimized signal transmission with a 29% increase in resonance frequency and 23% reduction in stub length compared to previous designs.
Implementation Method 1
The first wider section may create an impedance mismatch between the first connector lead and the first connector wipe
Implementation Method 2
utilizing a dielectric material with a lower dielectric constant below the wipe to create an impedance mismatch
Implementation Method 3
along with grooves or ferrite coating to minimize stub reflections and enhance signal integrity
Data Source
AI summary
A printed circuit board includes a dielectric and a connector. The connector is mounted on the dielectric. The connector includes a first connector lead, a first contact point, and a first connector wipe. The first connector wipe includes a first wider section adjacent to the first contact point. The first wider section creates an impedance mismatch between the first connector lead and the first connector wipe.