USB Connector Grounding Sheet Reduces EMI Crosstalk
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Solution Overview
Problem
Existing USB connectors suffer from electromagnetic interference (EMI) and radio frequency interference (RFI) during high-speed signal transmission, leading to errors in wireless communication, particularly due to the close proximity of electronic components in modern devices and the insufficient bandwidth of USB 2.0.
Innovation Solution
An electrical plug connector design featuring a metallic shell, insulated housing, upper-row and lower-row plug terminals, and a grounding sheet with side arms and mounting legs that establish a low-impedance grounding path when inserted into a receptacle connector, reducing crosstalk, insertion loss, and interference by allowing dual orientation insertion and improved contact with the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If USB 2.0 connectors are used, then device compatibility is maintained, but transmission rate is insufficient for high-speed data transfer
Solution Approach 1:
The connector dynamically adapts its functionality based on the connected device. The USB Type-C interface supports multiple protocols (USB 2.0, USB 3.0, USB 3.1) and can automatically negotiate the appropriate transmission mode, allowing it to achieve high-speed transmission when needed while maintaining backward compatibility with older devices
Solution Approach 2:
The connector design incorporates parameters that can be changed to support different transmission rates. By using a standardized interface that supports variable bandwidth configurations, the system can adjust transmission speed parameters from USB 2.0 levels (480 Mbps) to USB 3.0 levels (5 Gbps) based on device requirements
2Volume of moving object
If electronic components are located closer together to reduce device size, then device portability is improved, but electromagnetic interference and radio frequency interference increase
Solution Approach 1:
The grounding sheet converts the potentially harmful electromagnetic interference into a beneficial grounding path. By providing dedicated grounding terminals and a grounding sheet that contacts the metallic shell, the design channels EMI and RFI through the grounding path to the circuit board, effectively using the interference paths as controlled discharge routes that protect sensitive signal transmission
3Object-affected harmful factors
If a grounding sheet with multiple contact points is used, then electromagnetic interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The grounding system is segmented into multiple functional components: grounding terminals on the plug connector, corresponding grounding terminals on the receptacle connector, and a grounding sheet with multiple contact points including side arms and mounting legs. This segmentation allows each component to be manufactured separately using standard processes, then assembled together to create the complete grounding path, reducing overall manufacturing complexity
Data Source
AI summary
An electrical plug connector includes a metallic shell, an insulated housing, and a grounding sheet. The insulated housing is received in a receiving cavity of the metallic shell and includes a mating room and side assembling cavities. The side assembling cavities are defined at two sides of the insulated housing and communicate with the mating room. The grounding sheet is at the insulated housing and in contact with the metallic shell. The grounding sheet includes a main body in the insulated housing, side arms extended toward the side assembling cavities from two sides of the main body, hook portions extended toward the mating room from the fronts of the side arms, and mounting legs extended from the rears of the side arms and protruded from the side assembling cavities.