QSFP-DD Receptacle Connector With Cable-Attached Contacts
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Solution Overview
Problem
Traditional QSFP receptacle connectors face challenges in signal integrity, coplanarity of contacts, dense through-hole manufacturing on printed circuit boards, and inadequate heat dissipation due to their horizontal right-angle design and surface mounting type.
Innovation Solution
A QSFP-DD receptacle connector with a contact module assembly featuring stacked horizontal wafers and a metallic cage, where contacts extend rearwardly to cables rather than the printed circuit board, allowing for improved heat dissipation and signal integrity through a symmetrical design with grounding contacts and differential pair signal contacts arranged for optimal alignment and air passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional horizontal right angle receptacle connectors are used, then mounting is simplified, but signal integrity cannot be fine tuned
Solution Approach 1:
The patent employs asymmetrical contact arrangements within the receptacle connector, where contacts are positioned at different depths and angles rather than uniformly. This allows optimization of signal paths for different contact pairs while maintaining a compact form factor, resolving the contradiction between mounting simplicity and signal integrity fine-tuning capability.
2Ease of manufacture
If surface mounting type receptacle connectors are used, then assembly is simplified, but coplanarity of contacts becomes difficult to achieve
Solution Approach 1:
The patent transitions from two-dimensional surface mounting to three-dimensional stacked configuration with vertical and angular contact arrangements. Contacts are positioned at multiple levels and angles within the housing, allowing coplanarity to be achieved through spatial distribution rather than strict planar alignment, thus maintaining assembly simplicity while improving contact precision.
3Quantity of substance
If stack type receptacle connectors with 152 contacts are used, then connection density is increased, but through-hole manufacturing becomes challenging
Solution Approach 1:
The patent divides the 152 contacts into multiple modular groups arranged in stacked configurations. Each stack contains a subset of contacts that can be independently positioned and connected, reducing the complexity of through-hole manufacturing by breaking down the dense single-layer arrangement into manageable three-dimensional modules.
4Quantity of substance
If stacked receptacle connectors are used, then connection capacity is increased, but heat dissipation capability deteriorates
Solution Approach 1:
The patent arranges contacts in three-dimensional stacked configurations with intentional spacing and angular orientations. This spatial distribution creates channels for air circulation between contact stacks, enabling heat to dissipate through convection pathways that would be blocked in traditional planar arrangements, thus maintaining connection capacity while improving thermal management.
Data Source
AI summary
A QSFP-DD receptacle connector received within a cage includes an insulative housing and a contact module assembly received within the housing. The contact module includes a plurality of horizontal wafers stacked with one another, and each wafer includes an insulator and a plurality of contacts integrally formed therein wherein each contact has a front contact sections extending forwardly into a mating cavity formed in the housing, and a rear connecting section connected to a cable rather than to the printed circuit board. The receptacle connector associated with a cable is attached to a chassis. The cage optionally forms therein two mating spaces respectively receiving two receptacle connectors with the associated cables extending rearwardly.