Split-Shell PCB Shielding for Pluggable Network Interfaces

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Solution Overview

Problem

Pluggable network interface devices face challenges in protecting exposed circuit components from damage during operation, connection, and handling, as existing designs do not provide adequate side protection, which can compromise signal integrity and component safety.

Innovation Solution

A split-shell housing design with shielded side portions that extend around the exposed PCB area, providing mechanical protection while maintaining airflow gaps for cooling and ensuring compatibility with existing connector formats.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the circuit substrate is extended beyond the housing to enable electrical interconnection, then connectivity is achieved, but the exposed circuit components become vulnerable to side damage

Engineering Contradiction:

Improveelectrical interconnection capabilityVSAvoidside damage to circuit components

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The housing is divided into a main body portion and an extended shielded portion. The shielded portion is segmented to include side walls that extend alongside the exposed circuit substrate, creating a protective barrier while maintaining the electrical interconnection function. This segmentation allows the housing to simultaneously provide connectivity and protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The extended shielded portion acts as an intermediary structure between the housing and the exposed circuit components. It provides mechanical protection and electromagnetic shielding to the vulnerable areas while allowing the circuit substrate to extend beyond the main housing body for electrical connection purposes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the housing is extended to protect exposed PCB areas, then mechanical protection is improved, but airflow for cooling is restricted

Engineering Contradiction:

Improvemechanical damage to circuit componentsVSAvoidcooling airflow

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The extended shielded portion is designed with differentiated local qualities: solid side walls provide protection in areas where mechanical damage risk is highest, while incorporating airflow gaps and openings in regions where cooling is critical. This local quality variation allows simultaneous achievement of protection and thermal management.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The shielded portion replicates the protective function of the main housing body while adapting its structure to accommodate the exposed circuit substrate. It copies the enclosures concept but modifies it to include extended side walls and airflow pathways specific to the interconnection end geometry.

Inventive Principle:

Principle #26Copying

3Object-affected harmful factors

If the shielded portion is extended to follow the PCB shape, then protection coverage is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveexposed circuit areasVSAvoidhousing fabrication

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The complex shielded portion is segmented into standardized geometric features (side walls, base portions, airflow gaps) that can be manufactured using conventional processes. Each segment serves a specific protective or cooling function, allowing the overall complex shape to be achieved through assembly of simpler manufactured components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The extended shielded portion is designed as a multi-functional element that simultaneously provides mechanical protection, electromagnetic shielding, and airflow management. This universal design consolidates multiple protective functions into a single housing extension, reducing the need for additional separate components and simplifying manufacturing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11876315B2Mechanical shielding for circuit components of a pluggable network interface device

Publication Date: 2024.01.16 MELLANOX TECHNOLOGIES LTD(IL)

AI summary

A pluggable network interface device is provided comprising a split-shell housing having a shielded side portion that protects a side of a circuit substrate disposed in the split-shell housing. The split-shell housing comprises a first shell portion that covers a first side of the circuit substrate and a second shell portion that covers a second side of the circuit substrate that is arranged opposite the first side. The shielded side portion is inset from a width of the split-shell housing and offset a distance from an electrical interconnection end of the circuit substrate. The shielded side portion is arranged at least partially in a notch of the circuit substrate disposed at the electrical interconnection end of the circuit substrate.