USB Connector Shielding for EMI Reduction
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Solution Overview
Problem
Existing USB connectors face challenges in reducing electromagnetic interference (EMI) and meeting usability, durability, and robustness requirements, particularly with the increasing speed of USB 3.0 signals, which conventional metal shells are inadequate to address.
Innovation Solution
The design incorporates a metal shell with an insulation housing and conductive contact members or spring members, featuring a low-impedance grounding path and adjustable resistance through geometry, material selection, and surface finishing, allowing for flexible insertion orientations and reduced EMI by establishing a low-impedance grounding path between the metal shells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmission rate of USB connectors is increased to USB 3.0 speed, then the bandwidth and performance are improved, but electromagnetic interference (EMI) increases and conventional metal shell shielding becomes inadequate
Solution Approach 1:
The patent employs a composite shielding structure combining metal shell with additional EMI shielding materials or configurations. The metal shell is supplemented with EMI shielding gaskets, coatings, or integrated shielding structures that work together to provide enhanced electromagnetic interference protection suitable for USB 3.0 transmission rates.
Solution Approach 2:
The EMI shielding function is divided into multiple components: the metal shell provides primary shielding, while additional shielding elements (such as shielding gaskets, coatings, or separate shielding structures) provide supplementary protection. This segmentation allows each component to address specific frequency ranges or directional EMI sources.
2Volume of moving object
If conductive contacts are brought closer together to make connectors smaller, then the form factor is reduced, but electromagnetic coupling between contacts increases generating noise and crosstalk
Solution Approach 1:
The patent introduces EMI shielding structures as intermediary elements between the closely spaced conductive contacts. These shielding structures act as mediators that block electromagnetic fields between adjacent contacts, preventing coupling and crosstalk while allowing the contacts to remain in close proximity for compact connector design.
Solution Approach 2:
The patent applies localized EMI shielding measures specifically at critical areas where electromagnetic coupling occurs between adjacent contacts. Rather than uniformly shielding the entire connector, shielding materials or structures are strategically positioned between specific contact pairs to address local coupling issues while maintaining overall compactness.
3Device complexity
If conventional metal shell EMI shielding is used, then the structure is simple, but the shielding is inadequate for high-speed USB 3.0 signals
Solution Approach 1:
The patent transitions from simple metal shell shielding to a composite shielding system that integrates multiple materials and structures. This includes combining metal shell with EMI shielding coatings, gaskets, or additional shielding components to achieve the reliability needed for USB 3.0 while managing the increased complexity through systematic integration.
4Ease of operation
If insertion force is reduced for ease of use, then usability is improved, but durability and robustness may be compromised
Solution Approach 1:
The patent employs dynamic contact members with elastic properties that adapt during insertion and extraction. The elastic contact portions can deform to accommodate insertion forces and then rebound to maintain reliable electrical contact, providing both ease of insertion and durable connection over repeated cycles.
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 solution effectively reduces EMI, meets EMI regulations, and accommodates the requirements of lower insertion force compared to extraction force, enhancing the usability and durability of USB connectors while allowing for flexible insertion orientations.
Implementation Method 1
The conductive contact members or spring members are respectively received in recessed portions symmetrically disposed at a top side and a bottom side of the base portion and respectively connected to the inner wall of the metal shell
Implementation Method 2
the EMI shielding provided by conventional shell is proving to be inadequate... establish a low-impedance grounding path between the metal shells
Implementation Method 3
The elastic contact portions are arched contact portions, which are extended from one sides of the body portions of the conductive contact members or spring members
Data Source
AI summary
An electrical receptacle connector provided to connect with an electrical plug connector. The electrical receptacle connector includes a metal shell, an insulation body and a the conductive contact members. The conductive contact members are disposed at the insulation body to connect with the metal shell. The electrical plug connector includes a metal shell and a tubular portion disposed at a front portion of the metal shell. When the electrical plug connector is plugged into the electrical receptacle connector, the surface of the tubular portion of the electrical plug connector is in contact with the conductive contact members.