Backplane Connector Shield Structure for Stable Signal Impedance
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Solution Overview
Problem
Existing backplane connectors experience impedance changes in signal terminals when transitioning from a mating to a separation state, leading to instability in signal transmission.
Innovation Solution
The design incorporates a metal shield surrounding member with a surrounding portion and reflective pieces that extend into an inner cavity, forming a fully-enclosed shielding cavity to stabilize impedance by reducing dielectric constant changes during separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal shield surrounding member uses a simple surrounding structure, then the device complexity is reduced, but the impedance stability of signal terminals deteriorates
Solution Approach 1:
The metal shield surrounding member is segmented into a surrounding portion and a mounting portion, with the surrounding portion further divided into first, second, third, and fourth side walls. This segmentation allows each wall to be independently optimized for impedance control while maintaining overall structural simplicity.
Solution Approach 2:
The patent introduces a fifth dimension by adding reflective pieces that extend into the inner cavity along a direction perpendicular to the side walls. This dimensional addition provides an extra degree of freedom for impedance adjustment without significantly increasing overall structural complexity.
2Reliability
If the metal shield surrounding member includes reflective pieces extending into the inner cavity, then the impedance stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The reflective pieces are merged with the surrounding portion of the metal shield surrounding member, forming an integrated structure. This merging eliminates the need for separate assembly steps and reduces manufacturing complexity while maintaining the impedance-stabilizing function of the reflective pieces.
Solution Approach 2:
The reflective pieces are designed with adjustable parameters including extension length into the inner cavity and angular orientation. These parameter variations allow optimization of impedance stability while maintaining compatibility with standard manufacturing processes for metal forming and bending.
Data Source
AI summary
A backplane connector includes a housing, an insulating body, a terminal module and a metal shield surrounding member. The housing includes a base, a first side wall, a second side wall and a receiving space. The metal shield surrounding member is sleeved on the insulating body. The metal shield surrounding member includes a surrounding portion protruding into the receiving space. The surrounding portion defines an inner cavity. The surrounding portion includes a port portion and a reflective piece bent from the port portion. The reflective piece extends at least partially into the inner cavity and is configured to adjust impedance of a signal terminal to a certain extent.