Transceiver Module Metal Housing EMI Containment Design

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Solution Overview

Problem

Existing transceiver modules face challenges in achieving effective electromagnetic interference (EMI) containment, particularly in small form factor designs with increased module density and data speed, where traditional methods like epoxy application and EMI gaskets are either time-consuming, inconsistent, or costly.

Innovation Solution

The transceiver module incorporates a metal housing with U-shaped or C-shaped fixing portions that engage with the base portion, forming a tight fit and extending along the length of the cover portion to prevent EMI leakage, eliminating the need for epoxy and reducing assembly complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If epoxy is used to bridge the gap between top and bottom housing, then EMI containment is improved, but assembly time increases and process consistency deteriorates

Engineering Contradiction:

ImproveEMI containmentVSAvoidassembly time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent extracts and eliminates the epoxy material from the assembly process by designing an interference fit mechanism between the metal housing and plastic housing that mechanically bridges the gap without requiring adhesive materials

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The metal housing is designed with dimensions and tolerances that enable it to self-align and self-secure to the plastic housing through interference fit, eliminating the need for external adhesive application processes

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If EMI gasket is used to bridge the gap between top and bottom housing, then EMI containment is improved, but cost increases

Engineering Contradiction:

ImproveEMI containmentVSAvoidmaterial cost

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The patent removes the EMI gasket component entirely by designing the metal housing itself to provide the EMI shielding function through its inherent conductivity and precise fit to the plastic housing

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The metal housing serves multiple functions simultaneously: it provides structural support, aesthetic finish, and EMI shielding, eliminating the need for separate EMI gasket components

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Quantity of substance

If sheet metal is used as top housing and die casting as bottom housing, then cost is reduced, but EMI containment consistency deteriorates without additional EMI measures

Engineering Contradiction:

Improvemanufacturing costVSAvoidEMI containment consistency

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by designing specific regions of the metal housing with precise dimensional tolerances and interference fit features that ensure consistent EMI containment at critical gap locations without requiring expensive EMI gaskets throughout

Inventive Principle:

Principle #3Local quality

4Object-affected harmful factors

If traditional epoxy application method is used, then EMI containment is improved, but manufacturing complexity increases

Engineering Contradiction:

ImproveEMI containmentVSAvoidassembly process complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent replaces the chemical adhesive system (epoxy application, curing, alignment) with a mechanical interference fit system that relies on dimensional precision and elastic deformation for secure assembly

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 design enhances EMI containment by providing a longer leakage path for electromagnetic interference and simplifies assembly, eliminating the need for additional materials like epoxy, while maintaining cost-effectiveness and improving shielding performance.

Implementation Method 1

a metal housing enclosing the printed circuit board and defining a front opening... providing a longer leakage path for electromagnetic interference... improving shielding performance

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

each of the fixing portions includes a top portion inwardly extending from a top end thereof, and the top portion is inserted in a corresponding gap

Methodology Applied

Scientific EffectInterference fit: Mechanical Fastener

Data Source

PatentUS9872419B1Transceiver module having improved metal housing for EMI containment

Publication Date: 2018.01.16 FOXCONN INTERCONNECT TECHNOLOGY LTD

AI summary

A transceiver module includes a printed circuit board and a metal housing enclosing the printed circuit board and defining a front opening, the metal housing including a base portion and a cover portion, the base portion including two opposite side portions, the cover portion including two opposite fixing portions each engaged with a corresponding side portion; wherein each of the side portions defines a gap having an outside opening on an outside wall thereof, each of the fixing portions includes a top portion inwardly extending from a top end thereof, and the top portion is inserted in a corresponding gap.