Foil Laminate Enclosure with Apertures for RF and Moisture Protection
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Solution Overview
Problem
Electronic equipment enclosures made of plastic allow moisture permeation, leading to failures in wet environments, and more water-resistant designs are hindered by cost and RF connectivity requirements.
Innovation Solution
A multi-layered enclosure structure with a foil moisture-barrier layer and external antenna layers, where the foil layer is not the outermost, allowing RF communication through openings and maintaining water resistance by using a skirt to reinforce the foil layer at the opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic enclosure is used, then cost is reduced and manufacturing is simplified, but moisture permeation occurs leading to electronic failures
Solution Approach 1:
The patent uses a multi-layer composite structure consisting of an inner enclosure (metal or plastic), an outer enclosure, and a foil barrier layer with adhesive bonds between them. This composite construction provides superior moisture resistance compared to simple plastic enclosures while maintaining manufacturability through standardized layering and bonding processes.
2Reliability
If a foil moisture-barrier layer is added, then moisture resistance is improved, but RF connectivity is blocked
Solution Approach 1:
The foil barrier layer is segmented by creating openings at antenna locations. These openings allow RF signals to pass through the otherwise continuous foil layer, enabling wireless communication while maintaining moisture protection in the sealed portions of the enclosure.
Solution Approach 2:
The foil layer has different properties at different locations: it is continuous and sealed in most areas to provide moisture protection, but has openings at specific antenna locations to allow RF signal transmission. This localized variation in foil continuity resolves the contradiction between moisture resistance and RF connectivity.
3Object-affected harmful factors
If openings are created in the foil layer for antennas, then RF connectivity is enabled, but moisture protection is compromised
Solution Approach 1:
The antenna opening in the foil layer is nested within a protective structure formed by the inner and outer enclosures. The inner enclosure has a first opening, the foil layer has a second opening aligned with it, and the outer enclosure has a third opening, creating a nested pathway that allows RF signals while the surrounding sealed structure maintains moisture protection.
4Reliability
If a multi-layered structure with foil barrier is used, then moisture resistance is improved, but cost increases
Solution Approach 1:
The patent uses thin foil barrier layers (such as metallized film or aluminum foil) instead of thick metal enclosures. These thin films provide effective moisture protection at lower material cost and weight, while the multi-layer construction with air gaps provides additional protection without requiring excessive material thickness.
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 protects electronics from moisture while enabling RF transmission and reception without significant impedance, ensuring reliable operation in wet environments while meeting cost and connectivity needs.
Implementation Method 1
an adhesive layer between the foil moisture-barrier layer and the inner enclosure
Implementation Method 2
a foil moisture-barrier layer... providing protection against moisture
Implementation Method 3
positioning a plurality of low cost antennas in an external location so that transmission and/or reception by the antennas will not be significantly impeded
Data Source
AI summary
An electronics enclosure is configured to provide protection against a wet and/or humid environment, and that is configured to allow radio frequency (RF) reception and transmission by electronics within the enclosure. In an example of the enclosure, a plurality of layers interact synergistically to provide protection against moisture and a plurality of low cost antennas are disposed proximate an exterior of the enclosure. In the example, a foil layer of the enclosure defines a small opening, through which RF and electrical coupling occurs. The coupling ensures electrical connection to the antenna(s), defined in a layer proximate an exterior of the enclosure.