Conformable Vacuum-Formed Film for RF Shielding and Heat Dissipation
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Solution Overview
Problem
The challenge in designing mobile wireless communications devices is to create housings that provide desired operating characteristics within the limited space available while incorporating antennas and electronic components, particularly in reducing device thickness and enhancing RF shielding and heat dissipation.
Innovation Solution
A mobile wireless communications device incorporates a conformable, shape-retaining film with an electrically conductive layer for RF shielding and a dielectric layer for thermal conductivity, vacuum formed onto electronic components to conform to the device's shape, reducing overall thickness and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional rigid RF shielding structures are used, then RF shielding effectiveness is maintained, but device thickness increases and space is wasted
Solution Approach 1:
The patent applies a flexible conformable film with integrated RF shielding layer that can be vacuum-formed to wrap tightly around electronic components. This thin film structure provides effective RF shielding while minimizing device thickness, replacing traditional rigid bulkier shielding structures with a flexible conformable solution that adapts to component geometries.
Solution Approach 2:
The patent transitions from planar or box-like RF shielding structures to a three-dimensional conformable film that wraps around components in multiple dimensions. This dimensional approach allows the shielding to follow the contours of electronic components, providing comprehensive coverage with minimal space occupation and reduced device thickness.
2Temperature
If conventional heat dissipation methods are used, then thermal management is achieved, but additional components increase device complexity and space
Solution Approach 1:
The conformable film integrates multiple functions into a single structure: RF shielding through the conductive layer, heat dissipation through the thermally conductive dielectric layer, and physical protection through the encapsulation. This multi-functional design eliminates the need for separate heat sinks or thermal management components, reducing device complexity while maintaining effective heat dissipation.
Solution Approach 2:
The patent employs a composite structure consisting of a dielectric layer with embedded thermally conductive material and an RF shielding layer. This composite material approach enables simultaneous thermal management and electromagnetic shielding functions within a single integrated component, reducing the need for additional separate heat dissipation components.
3Reliability
If multiple separate shielding and heat dissipation components are used, then functional requirements are met, but device thickness and complexity increase
Solution Approach 1:
The patent merges RF shielding functionality and heat dissipation functionality into a single integrated conformable film structure. The film combines a thermally conductive dielectric layer with an RF shielding layer, allowing both thermal management and electromagnetic shielding to be achieved through one component rather than multiple separate parts, thereby reducing device 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
The solution effectively reduces the device's thickness by conforming the RF shield to the components, enhancing RF shielding and heat dissipation, thereby addressing the space constraints and performance needs of mobile devices.
Implementation Method 1
the conformable, shape-retaining film being vacuum formed onto the at least one electronic component
Implementation Method 2
The conformable, shape-retaining film may include an electrically conductive layer to provide Radio Frequency (RF) shielding
Implementation Method 3
The conformable, shape-retaining film may further include a dielectric layer adjacent the electrically conductive layer
Data Source
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AI summary
A mobile wireless communications device may include a portable housing, a printed circuit board (PCB) carried by the portable housing, and at least one electronic component carried by PCB and extending upwardly therefrom. The mobile wireless communications device may also include a conformable, shape-retaining film being vacuum formed onto the at least one electronic component and may include a peripheral edge secured to the PCB and a body portion conforming to the at least one electronic component. The conformable, shape-retaining film may operate similar to a heat sink, for example, to facilitate removal of heat from a processor, for example. The processor may generate an increased amount of heat compared to other electronic components. Moreover, the conformable, shape-retaining film may also provide increased RF shielding of some electronic components from other circuitry, for example, the wireless transceiver and the antenna of the device.