Plug Connector Common-Mode Filter for Alien Cross Talk
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Solution Overview
Problem
Existing connectors for telecommunications and data technology, such as RJ45 sockets, suffer from increased Alien Cross Talk (AXT) interference at high transmission rates like CAT6 or 10 Gigabit/s Ethernet, particularly due to common-mode coupling issues which affect broadband transmissions.
Innovation Solution
A common-mode filter arrangement is implemented for each wire pair using separate ferrite sleeves, with a ferrite sleeve holder to prevent magnetic coupling, and the filter is designed to attenuate interfering common-mode signals, reducing AXT both within and between connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ferrite sleeve is used for all wire pairs, then the structure is simple, but the common-mode signal attenuation is insufficient because signals on different wire pairs do not have the same direction
Solution Approach 1:
The single ferrite sleeve is segmented into multiple separate ferrite sleeves, with each sleeve assigned to a specific wire pair. This segmentation allows each sleeve to independently attenuate common-mode signals on its assigned wire pair, regardless of the signal direction on other pairs, thereby solving the insufficient attenuation problem while maintaining structural simplicity through modular design
2Volume of moving object
If ferrite sleeves are placed close together to save space, then the device size is reduced, but magnetic coupling between sleeves increases causing AXT interference
Solution Approach 1:
A non-magnetic spacer material is introduced as an intermediary between adjacent ferrite sleeves. This spacer prevents direct magnetic coupling between the sleeves while maintaining compact spacing, thereby reducing AXT interference without significantly increasing the connector volume. The spacer acts as a magnetic barrier that blocks the harmful magnetic field interaction
3Speed
If broadband filtering is implemented to handle CAT6 and 10 Gigabit/s Ethernet, then high transmission rates are supported, but AXT interference increases due to differential to common mode conversion
Solution Approach 1:
Each wire pair is equipped with its own dedicated ferrite sleeve with optimized magnetic properties for broadband filtering. This local quality enhancement ensures that each pair's common-mode signals are independently attenuated, preventing the accumulation and conversion of interference that would otherwise occur in broadband applications, thereby supporting high transmission rates while reducing AXT
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 solution effectively attenuates common-mode signals, minimizing Alien Cross Talk and improving signal integrity at high transmission rates by reducing interference between adjacent connectors.
Implementation Method 1
A common-mode filter arrangement is assigned to each pair of wires. As a result, an interfering common-mode signal is attenuated in pairs
Implementation Method 2
The ferrite sleeve holder is designed in such a way that the individual ferrite sleeves do not touch, thus avoiding magnetic coupling
Data Source
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AI summary
The invention relates to a plug connector (1) for telecommunications and data technology, for connection of a balanced data cable, with the plug connector (1) having an electrically insulating plug connector housing (2) as well as first contacts (8) and second contacts (7), with the first contacts making contact with a plurality of conductor pairs in a balanced data cable, and with the second contacts being able to make electrical contact with the contacts of a complementary plug connector, with in each case two first contacts being associated with one conductor pair and with each first contact being associated with one second contact, with the first contacts being galvanically connected to their associated second contacts, and with all the conductor pairs each being associated with a common-mode filter arrangement.