Perforated Common Ground Shield for Crosstalk Reduction
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Solution Overview
Problem
Conventional electrical connectors experience undesirable crosstalk between closely spaced signal contacts due to interfering electrical fields, which compromises signal integrity, and existing solutions like metallic crosstalk shields may not adequately address this issue across varying signal frequencies and impedance levels.
Innovation Solution
A common ground shield with a perforated, planar body is disposed at the mating interface of an electrical connector, featuring windows and ribs to reduce crosstalk while matching the desired impedance level, and is configured to establish a common ground path between electrical connectors, replacing discrete ground contacts between differential signal pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal contacts are closely spaced to increase connector density, then productivity and compactness are improved, but crosstalk between adjacent signal contacts increases due to interfering electrical fields
Solution Approach 1:
A common ground shield is introduced as an intermediary structure between closely spaced signal contacts. The shield includes a substantially planar ground plate with multiple windows positioned between adjacent signal contacts, creating an electromagnetic barrier that reduces crosstalk while allowing the signal contacts to remain closely spaced for high connector density.
Solution Approach 2:
The ground shield employs a porous or perforated structure with multiple windows extending through the ground plate. This porous configuration allows the shield to reduce crosstalk between signal contacts while maintaining impedance matching and allowing controlled electromagnetic field interaction. The windows are strategically positioned to block interfering fields between adjacent signal contacts.
2Object-affected harmful factors
If conventional metallic crosstalk shields are added to reduce interference, then crosstalk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The common ground shield merges multiple functions into a single integrated structure: it provides crosstalk reduction, establishes a common ground reference, and maintains impedance matching. The shield combines a continuous ground plate with strategically positioned windows, eliminating the need for separate discrete ground contacts and complex shielding structures between each signal pair.
Solution Approach 2:
The common ground shield serves multiple functions simultaneously: it acts as a crosstalk barrier between adjacent signal contacts, provides a common ground reference for all differential pairs, and maintains desired impedance levels through its window configuration. This multi-functional design simplifies the overall connector structure compared to using multiple separate shielding elements.
3Object-affected harmful factors
If ground contacts are used to separate differential signal pairs, then crosstalk is reduced, but device complexity increases due to multiple discrete ground contacts
Solution Approach 1:
Multiple discrete ground contacts are merged into a single common ground shield structure. The shield includes a continuous ground plate that provides a common ground reference for all differential signal pairs, eliminating the need for multiple separate ground contacts. The windows in the ground plate maintain crosstalk reduction functionality while simplifying the overall ground structure.
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 common ground shield effectively reduces crosstalk and maintains impedance matching across the mating region, allowing for efficient signal transmission with reduced interference, even at higher signal frequencies, by establishing a common ground path and balancing impedance and crosstalk.
Implementation Method 1
The leadframe assemblies can be supported in the connector housing, such that the electrical contacts define a desired array of signal and ground contacts. Unfortunately, signal contacts can be so closely spaced that undesirable interference, or 'cross talk,' occurs between adjacent signal contacts. Cross talk occurs when a signal in one signal contact induces electrical interference in an adjacent signal contact due to interfering electrical fields
Implementation Method 2
The common ground shield defines a plurality of windows that extend through the body so as to reduce crosstalk and substantially match a desired impedance level
Data Source
AI summary
An electrical connector assembly includes a first electrical connector and a second electrical connector that can be mated so as to establish an electrical connection across the electrical connectors at a mating region. One of the electrical connectors includes a perforated common ground shield at the mating region that reduces crosstalk while substantially matching impedance at the mating region to a desired impedance of the electrical connector assembly.