Nonuniform Air Grid for Electromagnetic Shielding and Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing housing walls for electronic devices face challenges in providing both effective electromagnetic shielding and sufficient heat dissipation, especially in the GHz range, as traditional air grids with smaller holes improve shielding but reduce air exchange and lead to heat accumulation and resonance noise.
Innovation Solution
A housing wall design featuring a dual-layer air grid with misaligned and irregularly shaped through-holes, providing electrical conductivity and enhanced electromagnetic shielding while maintaining sufficient air ventilation through a nonuniform total through-hole configuration, which reduces standing waves and allows effective thermal energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the hole size in air grid is reduced to improve electromagnetic shielding, then electromagnetic shielding performance is improved, but air exchange capability deteriorates
Solution Approach 1:
The air grid is segmented into multiple layers (first layer and second layer) with mesh structures. Each layer contains through-holes that are misaligned with corresponding holes in other layers, creating a multi-stage filtration and shielding effect. This segmentation allows the system to achieve both electromagnetic shielding and adequate air exchange by distributing the shielding function across multiple interfaces rather than relying on a single layer of small holes.
Solution Approach 2:
The through-holes in different layers are intentionally misaligned asymmetrically, creating a nonuniform total through-hole configuration. This asymmetry prevents the formation of straight through-channels that would compromise electromagnetic shielding, while still maintaining sufficient total open area for air exchange. The misalignment creates a tortuous path for electromagnetic waves while allowing convective heat transfer.
2Productivity
If homogeneous honeycomb-shaped holes are used for air ventilation, then air exchange capability is improved, but electromagnetic shielding performance deteriorates
Solution Approach 1:
While maintaining an overall honeycomb-like geometric pattern for structural integrity and manufacturing ease, the patent introduces local variations by misaligning holes between layers and potentially varying hole dimensions. This local differentiation disrupts the periodicity that would otherwise create resonance frequencies, thereby improving electromagnetic shielding across a broader frequency range while preserving the beneficial air exchange characteristics of the honeycomb structure.
3Object-affected harmful factors
If smaller holes are used in air grid, then electromagnetic shielding is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent transitions from a single-layer two-dimensional hole pattern to a multi-layer three-dimensional misaligned hole configuration. This dimensional change creates a more complex spatial arrangement where electromagnetic waves must navigate multiple interfaces and misaligned openings, significantly improving shielding. Simultaneously, the cumulative open area across multiple layers maintains adequate pathways for convective heat transfer, preventing heat accumulation.
4Object-affected harmful factors
If grid structures with small holes are used, then electromagnetic shielding is improved, but resonance noise increases
Solution Approach 1:
The air grid functions as a composite structure combining multiple layers with different hole patterns and orientations. This composite configuration creates a non-periodic overall structure that lacks the regular geometric repetition necessary for resonance phenomena. The misaligned holes across layers create a randomized effective aperture distribution, broadening the electromagnetic shielding bandwidth while eliminating narrowband resonance peaks that would generate noise.
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 dual-layer air grid effectively shields against electromagnetic radiation and ensures efficient heat dissipation by maintaining a large cross-sectional opening area, reducing heat accumulation and resonance noise, while improving mechanical strength and resource efficiency.
Implementation Method 1
The electrical connection between the layers provide the possibility to electrically shield the cross-sectional surface area of the air grid. The nonuniformity of the through-holes of the different layers improves the electromagnetic shielding properties.
Implementation Method 2
sufficient air ventilation for effectively dissipating the thermal energy of the electronic device is achieved since the total cross-sectional opening area may still be large and the single irregular through-holes still provide sufficient diameters for an effective air exchange.
Data Source
AI summary
A housing wall includes at least one air grid having at least a first layer with a first mesh structure and a second layer with a second mesh structure. The first mesh structure is coextensively arranged with the second mesh structure. The first layer and the second layer are electrically conductively coupled. The first mesh structure includes a first plurality of through-holes. The second mesh structure includes a second plurality of through-holes. The through-holes of the first plurality of through-holes are misaligned compared to through-holes of the second plurality of through-holes such that a nonuniform total through-hole configuration of the air grid is provided.