USB Type-C Connector Grounding Sheet Crosstalk Reduction
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Solution Overview
Problem
Existing USB connectors, particularly USB Type-C, face issues with signal transmission quality due to crosstalk interference between closely spaced terminals, which cannot be effectively reduced by existing baffle plates, necessitating a new architecture to support higher bandwidth demands and maintain performance.
Innovation Solution
The proposed electrical receptacle connector features a metallic shell, insulated housing, upper-row and lower-row terminals, and a grounding sheet with protruded portions that contact the ground terminals, effectively grounding noise and reducing crosstalk interference by sandwiching the grounding sheet between terminal rows and connecting it to a circuit board, while allowing dual orientation insertion due to 180-degree symmetrical pin-assignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of USB Type-C electrical receptacle connector is made small with terminals close to each other, then the compactness and integration are improved, but the signal transmission quality deteriorates due to crosstalk interference between terminals
Solution Approach 1:
A grounding sheet is introduced as an intermediary component positioned between adjacent terminals. This grounding sheet acts as a mediator to shield and isolate the electromagnetic fields between closely spaced terminals, reducing crosstalk interference while maintaining the compact connector design. The grounding sheet is electrically connected to ground terminals to effectively dissipate interfering signals.
Solution Approach 2:
The grounding sheet is selectively positioned only in critical areas where crosstalk occurs between specific terminal pairs. This local intervention approach allows the connector to maintain compact overall dimensions while providing targeted shielding exactly where needed, rather than requiring uniform spacing or shielding throughout the entire connector structure.
2Object-affected harmful factors
If existing baffle plates are used to reduce interference between terminals, then some noise attenuation is achieved, but the crosstalk interference cannot be reduced effectively
Solution Approach 1:
The grounding sheet serves as a more effective intermediary compared to traditional baffle plates. It is positioned directly between adjacent terminals to provide electrostatic shielding, whereas baffle plates are disposed at the tongue portion and connected to circuit board for grounding. The grounding sheet's direct positioning and electrical connection to ground terminals provide superior interference reduction.
Solution Approach 2:
The grounding sheet changes the electrical parameter distribution between terminals by introducing a grounded conductive plane. This modifies the electromagnetic field distribution and reduces coupling between adjacent terminals, achieving better interference reduction than baffle plates which primarily provide physical separation without optimal electrical shielding.
3Reliability
If grounding sheet is added to reduce crosstalk, then signal transmission quality is improved, but the device complexity increases
Solution Approach 1:
The grounding sheet is merged with the insulated housing structure, forming an integrated assembly. This combination approach reduces the number of separate components and simplifies the overall connector structure, as the grounding sheet becomes part of the housing rather than a standalone element requiring separate installation and alignment.
Solution Approach 2:
The grounding sheet serves multiple functions simultaneously: it provides electrostatic shielding between terminals, acts as a structural support element within the housing, and establishes electrical connection paths to ground terminals. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device 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
This design enhances signal transmission quality by effectively grounding noise and reducing crosstalk, improves structural strength, and allows for dual orientation compatibility without compromising signal specifications.
Implementation Method 1
The grounding sheet is disposed at the insulated housing and located between the ground terminal of the upper-row terminals and the ground terminal of the lower-row terminals. The grounding sheet comprises at least one protruded portion being in contact with the ground terminal of the upper-row terminals or the ground terminal of the lower-row terminals.
Data Source
AI summary
An electrical receptacle connector includes an insulated housing, upper-row terminals, lower-row terminals, and a grounding sheet. The insulated housing includes a base portion and a tongue portion. The tongue portion is extended from one side of the base portion and has an upper surface and a lower surface. The upper-row terminals are disposed at the base portion and the tongue portion and include a ground terminal located at the upper surface The lower-row terminals are disposed at the base portion and the tongue portion and include a ground terminal located at the lower surface. The grounding sheet is disposed at the insulated housing and located between the ground terminal of the upper-row terminals and the ground terminal of the lower-row terminals. The grounding sheet includes one or more protruded portion in contact with the ground terminal of the upper-row terminals or the ground terminal of the lower-row terminals.