Split Ground Plane RJ45 Plug for Crosstalk Control
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Solution Overview
Problem
Existing FCC type RJ45 plugs experience significant electrical signal interference and return loss due to parallel contacts, which are not effectively addressed by current technologies, particularly in reducing cross talk and return loss.
Innovation Solution
The use of a communication connector with a split ground plane architecture in the RJ45 plug, featuring a gap in the ground plane to electrically isolate sections, which enhances common mode isolation and improves differential pair transmission characteristics, thereby reducing cross talk and return loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a continuous ground plane is used in the RJ45 plug, then manufacturing is simpler and cost is lower, but cross talk and return loss increase significantly
Solution Approach 1:
The ground plane is divided into multiple separate ground sections rather than using a continuous ground plane. Each ground section is positioned adjacent to specific signal pairs, creating electrical isolation between different signal paths. This segmentation reduces electromagnetic coupling between pairs, thereby decreasing cross talk and return loss while maintaining manufacturing feasibility through standard PCB fabrication processes.
2Object-affected harmful factors
If ground plane sections are separated to reduce cross talk, then cross talk decreases, but device complexity increases
Solution Approach 1:
The ground plane structure is optimized locally by positioning ground sections adjacent to specific signal pairs rather than using a uniform continuous structure. Each ground section is strategically placed to provide shielding and reference plane for nearby signal pairs, creating locally optimized electromagnetic field distribution that reduces cross talk without requiring complex overall reconfiguration of the connector architecture.
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 split ground plane design significantly reduces cross talk and return loss, exceeding current Category 8 standards for NEXT, FEXT, and return loss at 2,000 MHz, while maintaining cost-effectiveness by using thin layers of high-frequency dielectric materials like FR408.
Implementation Method 1
a split ground plane architecture in the RJ45 plug, featuring a gap in the ground plane to electrically isolate sections
Implementation Method 2
using thin layers of high-frequency dielectric materials like FR408
Data Source
Figure 1~3
Figure 2
Figure 4
AI summary
A communication connector includes a housing and a plurality of electrical contacts received by the housing. A printed circuit board (PCB) is provided and includes at least first and second pairs of electrical conductive traces. The first pair of traces is connected to a first pair of contacts. The second pair of traces is connected to a second pair of contacts. The PCB further includes at least a first ground plane. The first ground plane has first and second sections. The first and second sections are electrically isolated from one another. At least a portion of the first and second sections being adjacent to at least a portion of the first and second pairs of traces, respectively, whereby signal transmission is enhanced. A layer of dielectric material which has a relatively low dielectric constant is located between the first and second traces and the first ground plane.