High-Speed Plug Connector Shielding for Impedance Consistency
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Solution Overview
Problem
Existing electrical connectors face challenges in supporting high-speed data transmission and maintaining signal integrity at higher frequencies while adhering to industry standards like PCIe and SAS/SATA Express, particularly in connectors designed for storage drives.
Innovation Solution
A plug connector design featuring an insulative housing with conductive terminals and a shielding member comprising a conductive member and lossy material, where the lossy material electrically couples ground terminals and is configured to suppress resonances, ensuring impedance consistency and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional shielding structures are used in electrical connectors, then manufacturing is simpler, but signal integrity deteriorates at high frequencies due to resonance and impedance inconsistency
Solution Approach 1:
The patent applies composite materials by combining conductive material with lossy material to form an integrated shielding member. The conductive portion provides electromagnetic shielding while the lossy material portion suppresses resonances and maintains impedance consistency. This composite structure resolves the contradiction by achieving high-frequency signal integrity without requiring multiple separate shielding components, thus maintaining manufacturing simplicity while improving performance.
Solution Approach 2:
The shielding member features local quality differentiation with distinct conductive and lossy material portions positioned at specific locations. The conductive material is placed where electromagnetic shielding is most needed, while the lossy material is positioned to target specific resonance-prone areas. This localized functional differentiation achieves superior signal integrity at high frequencies without uniformly increasing the overall structural complexity.
2Reliability
If complex shielding members with multiple components are used, then signal integrity improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the conductive shielding function and the lossy material resonance suppression function into a single integrated shielding member. This consolidation eliminates the need for precise assembly between multiple separate shielding components, thereby reducing manufacturing precision requirements while maintaining the signal integrity benefits of both functional elements.
Solution Approach 2:
By using composite materials that can be formed as an integrated structure, the patent reduces the number of assembly steps and associated precision requirements. The conductive and lossy material portions are combined in a single manufacturing process, eliminating tolerance accumulation and alignment issues that would arise from assembling multiple separate components.
3Reliability
If conventional connector designs are used, then mechanical robustness is adequate, but reliability during plugging and unplugging deteriorates at high frequencies
Solution Approach 1:
The patent converts the harmful resonance effects into a beneficial design feature by intentionally incorporating lossy material portions that target and suppress specific resonance frequencies. Rather than trying to avoid all resonances, the design acknowledges their presence and uses the lossy material to dissipate resonant energy, thereby improving connector reliability during plugging and unplugging operations at high frequencies.
Solution Approach 2:
The patent changes the electromagnetic parameters of the shielding structure by introducing lossy material with specific loss characteristics. This parameter change allows the shielding member to actively dampen resonant oscillations and reduce electromagnetic interference, thereby improving reliability during dynamic operations like plugging and unplugging without compromising mechanical robustness.
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 design enhances signal integrity and meets mechanical requirements for high-frequency operations, conforming to industry standards like PCIe and SAS/SATA Express, while improving reliability and reducing the likelihood of connector breakage during plugging and unplugging.
Implementation Method 1
lossy material disposed on the conductive member... configured to suppress resonances, ensuring impedance consistency and signal integrity
Data Source
AI summary
Plug connectors for use with high speed signals. The connector includes an insulative housing having a base portion and a tongue portion extending from the base portion, and conductive terminals held by the housing. Each conductive terminal has a mating portion held on a side of the tongue portion, a tail portion extending out of the housing, and an intermediate portion held in the base portion. The conductive terminals comprise signal terminals and ground terminals. A shielding member is disposed in the housing and includes features configured to provide shielding to signal terminals and electrically connect ground terminals. The shielding member also includes features configured to improve impedance consistency along conduction paths. Such a configuration meets signal integrity requirements in connectors designed for higher frequencies, while conforming to a standard that constrains mating and mounting interfaces.