Compound Enclosure Structure With Porous Metal RF Windows
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Solution Overview
Problem
It is challenging to form strong bonds between metal and non-metal materials in electronic device enclosures that can withstand forces like drops, while maintaining aesthetic appeal and efficient radio frequency (RF) transmission, as conventional adhesives and fasteners can be visible or obstructive.
Innovation Solution
A compound structure is formed with RF opaque metal sections and RF transparent sections, where the RF transparent material is molded within small pores of the metal sections, creating a strong interlock and enhancing RF transmission, and a cosmetic layer covers the structural components for aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to secure metal and non-metal portions, then the bond strength is improved, but the adhesive layers can be visible and detract from aesthetic appeal
Solution Approach 1:
The metal section is provided with pores at the interface surface, and the RF transparent material is molded within these pores to create mechanical interlocking. This porous structure provides strong bonding without requiring visible adhesive layers, thus maintaining aesthetic appeal while achieving strong bond strength.
Solution Approach 2:
The invention creates a composite structure where RF transparent material is integrated with metal sections through molding into pores and interlock features. This composite approach eliminates the need for separate adhesive layers while providing both structural strength and cosmetic appearance.
2Strength
If fasteners such as clips and screws are used to reinforce the bond, then the bond strength is improved, but fasteners can be visible and unattractive or take up valuable space within the enclosure
Solution Approach 1:
The bonding function and structural integration are merged into the molding process itself. The RF transparent material is molded directly onto the metal sections and interlocked through pores and interlock features, eliminating the need for separate fasteners that would be visible or occupy space.
Solution Approach 2:
The pores in the metal section serve dual purposes: providing mechanical interlocking for bond strength and enabling direct integration of the RF transparent material without requiring additional fastening components.
3Reliability
If a non-metal section is added to allow EM radio waves to permeate, then RF transmission is improved, but the bond strength between metal and non-metal portions may be insufficient to withstand forces such as drops
Solution Approach 1:
The pores in the metal section provide mechanical interlocking for the RF transparent material, ensuring strong bonding that can withstand drop forces while maintaining the non-metallic RF transparent properties needed for electromagnetic wave transmission.
Solution Approach 2:
The interface surface of the metal section is modified by creating pores with specific diameter parameters. This parameter change enables the RF transparent material to mechanically interlock with the metal, providing both the RF transmission capability and the structural strength to withstand impact forces.
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 provides a strong, aesthetically pleasing enclosure with improved RF transmission capabilities by securely bonding RF transparent materials within the metal sections, addressing the issues of bond strength and visibility while optimizing space and appearance.
Implementation Method 1
The interface surface has a pore with a diameter of less than one millimeter. The RF transparent section is engaged with the interface surface of the first metal section and wherein some of the RF transparent material is positioned within the pore.
Implementation Method 2
Adhesives can be used to help secure the metal and non-metal portions.
Implementation Method 3
The interface surface has a pore with a diameter of less than one millimeter
Data Source
AI summary
Compound structures and methods for forming the same are described. The compound structures can be used to form an enclosure. The enclosure may be formed from metal, such as aluminum, and further include one or more non-metal regions that allow for transmission and receipt of electromagnetic waves, such as radio frequency waves. The non-metal region can include a first section, a second section, and an optional cosmetic section. The first section can be firmly molded onto a metal section of the enclosure by small pores formed within the metal section. The second section can engage with interlock features of the first section. The optional cosmetic section can cover the first section and the second section such that the first section and the second section are not visible from an exterior of the enclosure.