Microfiber Ring EMI Shield for Movable Antennas

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Solution Overview

Problem

Existing EMI shielding devices for electronic devices with movable parts, such as retractable or rotatable antennas, face challenges in maintaining a continuous Faraday cage effect and environmental sealing due to gaps created by these movable components, which can lead to electromagnetic interference and contamination.

Innovation Solution

A densely packed microfiber ring EMI shield and environmental seal device that includes an electrically conductive cup with microfiber rings and spacers, providing a continuous electromagnetic shield and seal around movable components, even as they change shape or size, by maintaining contact through flexible, high-strength microfibers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional conductive O-rings or elastic gaskets are used around movable antennas, then some EMI shielding is achieved, but the sealing integrity is compromised over time and the EMI shielding effectiveness diminishes

Engineering Contradiction:

Improvesealing integrityVSAvoidEMI shielding effectiveness

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent combines conductive microfibers with flexible sealing materials to create a composite seal that simultaneously provides EMI shielding and environmental sealing. The conductive microfibers are embedded in a flexible matrix material, creating a multi-functional component that maintains both sealing integrity and EMI shielding effectiveness over time.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent uses flexible microfiber structures that can conform to the shape of movable antennas while maintaining continuous EMI shielding. The flexible nature of the microfiber seal allows it to adapt to changing geometries without compromising the continuity of the Faraday cage or the effectiveness of EMI shielding.

Inventive Principle:

Principle #30Flexible shells and thin films

2Adaptability or versatility

If conventional sealing devices are used around extendable antennas, then some EMI shielding is provided, but the sealing devices lack flexibility to conform to differing shapes

Engineering Contradiction:

Improveflexibility to conform to shapeVSAvoidEMI shielding continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent employs flexible microfiber structures that can dynamically adapt to the shape of extendable antennas. The microfiber seal maintains continuous EMI shielding while conforming to varying geometries, ensuring both adaptability and shielding continuity simultaneously.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent creates a dynamic sealing system where the microfiber structure can change its configuration in response to antenna movement. The flexible microfiber seal maintains continuous contact with the antenna surface throughout the range of motion, providing continuous EMI shielding regardless of antenna position or shape.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If openings are created in the housing for movable components, then accessibility and functionality are improved, but gaps are created that allow EMI penetration

Engineering Contradiction:

Improvecomponent accessibilityVSAvoidEMI penetration

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent uses flexible microfiber seals that can be installed around openings in the housing. These seals maintain continuous EMI shielding while allowing the movable components to operate freely. The flexible nature of the microfiber seal enables it to accommodate component movement without creating gaps that would compromise shielding effectiveness.

Inventive Principle:

Principle #30Flexible shells and thin films

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

The solution effectively blocks electromagnetic interference and provides a long-lasting environmental seal that conforms to the changing shape of movable components, enhancing the integrity of the Faraday cage and preventing signal transmission and contamination.

Implementation Method 1

EMI shielding consisting of conductive material surrounding an electronic device is used to create a Faraday cage which prevents electronic signals from penetrating into the enclosed space

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

the microfiber ring having densely packed microfiber filaments electrically connected to the housing and extending into the opening

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS8107260B2EMI shielding and environmental seal device

Publication Date: 2012.01.31 ILLINOIS TOOL WORKS INC

AI summary

An EMI shield for a movable component such as an antenna of an electronic device includes a microfiber ring of densely packed microfibers extending from an EMI shielding housing across the space defined by an opening in the housing for the movable component. Multiple microfiber rings can be used separated by spacers, and an environmental shield can be included.