Pluggable Transceiver Cage Nested Fingers EMI Shielding
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Solution Overview
Problem
Existing cage designs for pluggable optical transceivers leave gaps between fingers that can leak electromagnetic interference (EMI) radiation, particularly at high frequencies exceeding 10 Gbps, due to the arrangement of outward and inward protruding fingers which do not effectively fill the gaps between the front panel, cage, and transceiver housing.
Innovation Solution
The design features a plurality of cage fingers with a continuously formed first and second contact portion, each having a corrugated cross-section, allowing for nested tapered shapes that increase contact points and narrow gaps, ensuring multiple ground contacts and enhanced EMI shielding by eliminating gaps between fingers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outward and inward protruding fingers are used in the cage, then ground contact is achieved at multiple points, but gaps remain between the fingers that leak EMI radiation at high frequencies
Solution Approach 1:
The patent implements nested fingers where inner fingers are positioned within the gaps of outer fingers, creating a multi-layered shielding structure. This nesting arrangement fills the gaps between fingers more effectively, preventing EMI radiation leakage while maintaining multiple ground contact points for reliable grounding.
Solution Approach 2:
The patent transitions from a two-dimensional arrangement of fingers to a three-dimensional nested structure. By adding the inner fingers that protrude into the gaps between outer fingers, the solution moves from planar spacing to volumetric filling, effectively blocking EMI paths in multiple spatial dimensions.
2Object-affected harmful factors
If the gap between the front panel and cage, and between the cage and transceiver is narrowed, then EMI radiation is reduced, but the structural complexity increases
Solution Approach 1:
The cage structure is segmented into multiple finger elements (outer fingers and inner fingers) that can be independently configured. This segmentation allows the EMI shielding function to be distributed across multiple components, achieving effective gap filling without requiring a monolithic complex structure.
Solution Approach 2:
The nested finger structure serves multiple functions simultaneously: it provides EMI shielding by filling gaps, maintains ground contact stability through multiple contact points, and allows for modular assembly. This multi-functionality reduces the need for separate components, thereby managing structural complexity.
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 configuration stabilizes ground potential and significantly enhances EMI shielding performance at higher frequencies by ensuring multiple electrical contact points and reducing radiation leakage through the elimination of gaps between fingers.
Implementation Method 1
a first contact portion comes in electrically contact with the front panel, while, the second contact portion comes in electrically contact with the housing
Implementation Method 2
the cage provides a plurality of cage fingers each having a first contact portion and a second contact portion. The first contact portion comes in electrically contact with the front panel, while, the second contact portion comes in electrically contact with the housing
Data Source
AI summary
A new arrangement of the cage for the pluggable optical transceiver is disclosed. The cage provides a plurality of fingers which has a corrugated shape with first and second contact portion. The first contact portion comes in contact with the front panel of the host system when the cage is implemented therein, while, the second contact portion comes in contact with the housing of the transceiver when it is set within the cage.