Floating Contact Modules for Short-Stub High-Speed Connectors
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Solution Overview
Problem
Communication systems face challenges with signal integrity due to long electrical stubs in connectors, which degrade performance, especially in high-speed applications, as they act as reflective elements and generate nulls in transmitted energy at specific frequencies.
Innovation Solution
The introduction of a compressible contact module biasing system within the electrical connector housing allows contact modules to float independently, accommodating mating tolerances and angular misalignments, thereby reducing the need for long electrical stubs and improving signal integrity by shortening the mechanical stubs to just accommodate mechanical mating and contact wipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact stub length is increased to accommodate circuit board mating tolerance distances, then the reliability of contact mating is improved, but the signal integrity performance deteriorates due to the electrical stub acting as a reflective element
Solution Approach 1:
The connector is divided into multiple independent contact modules (e.g., 4x4 modules) that can move independently relative to each other and the connector housing. This segmentation allows each module to accommodate local misalignments without requiring excessive stub length, thereby reducing the electrical stub effect while maintaining reliable contact mating.
Solution Approach 2:
The contact modules are designed with dynamic movement capability through compressible biasing members (springs) that allow the modules to float and adjust their positions independently. This dynamic adjustment accommodates circuit board mating tolerances and angular misalignments without requiring long fixed stubs, thus improving signal integrity while maintaining contact reliability.
2Ease of operation
If the contact stub length is increased to accommodate angular misalignment during mating, then the ease of operation is improved, but the signal integrity performance deteriorates due to increased reflective energy loss
Solution Approach 1:
The compressible biasing members enable contact modules to dynamically adjust their positions and angles during the mating process, accommodating angular misalignments without requiring long stubs. This dynamic capability maintains ease of operation while minimizing the electrical stub length that causes signal degradation.
Solution Approach 2:
The biasing members allow the contact modules to change their physical parameters (position, orientation) in response to mating conditions. This parameter adjustment enables the connector to accommodate angular misalignment during operation while keeping the electrical stub length short to preserve signal integrity.
3Reliability
If the contact stub length is increased to accommodate dimensional tolerance accumulation, then the reliability of contact mating is improved, but the device complexity increases due to the need for longer contacts
Solution Approach 1:
Instead of using a single complex long-contact structure, the connector is segmented into multiple independent contact modules. Each module has a shorter stub length, reducing the electrical stub effect. The modular design actually simplifies the overall structure by allowing independent optimization of each module while accommodating cumulative tolerances through relative movement.
Solution Approach 2:
The dynamic floating capability of contact modules through compressible biasing members allows the system to accommodate dimensional tolerance accumulation without requiring excessively long contacts. This dynamic adjustment mechanism provides a simpler solution than fixed long stubs, as it allows shorter contacts to achieve the same reliability through movement.
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 enhances signal integrity in high-speed communication systems by eliminating the need for long electrical stubs, improving performance above 100 Gbps, and reducing signal degradation caused by reflective energy loss.
Implementation Method 1
contact module biasing members between the contact modules and the connector housing to forward bias the contact modules in the contact module chamber, wherein the contact module biasing members are compressible to allow the contact modules to move independent from each other
Data Source
AI summary
An electrical connector includes a connector housing having a mating end at a front of the connector housing configured to be mating with a mating electrical connector. The connector housing includes a contact module chamber. An electrical connector includes a stack of contact modules received in the contact module chamber. Each contact module includes a module body holding a plurality of contacts. The contacts have mating ends at the mating end of the connector housing for mating with the mating electrical connector; and an electrical connector includes a contact module biasing members between the contact modules and the connector housing to forward bias the contact modules in the contact module chamber, wherein the contact module biasing members are compressible to allow the contact modules to move independent from each other relative to the connector housing in the contact module chamber when mating with the mating electrical connector.