EMI Shield Waveguide Obstructions for Thermal Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of holes in electromagnetic interference (EMI) shields for electronic devices compromises their shielding ability, particularly for high-frequency waves, as they allow electromagnetic waves to propagate through, while larger holes are needed for thermal mitigation.
Innovation Solution
Incorporating obstructions within the openings of the EMI shield that function as waveguide structures and modal filters, increasing the cutoff frequency and maintaining shielding effectiveness without hindering airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If holes are added to EMI shield for thermal mitigation, then heat dissipation is improved, but shielding ability against electromagnetic waves deteriorates
Solution Approach 1:
The opening is segmented into multiple sections by dividing it into a first section and a second section separated by a partition structure. This segmentation allows the opening to function as both a thermal vent and an EMI shield, as each section can be optimized for its specific function while working together to resolve the contradiction between heat dissipation and electromagnetic shielding.
Solution Approach 2:
Different parts of the opening structure are given different properties: the partition structure creates regions with different characteristics, allowing one region to facilitate airflow for cooling while another region maintains electromagnetic shielding. The local structural variations enable simultaneous achievement of thermal mitigation and EMI protection.
2Productivity
If larger holes are used for thermal mitigation, then airflow is improved, but propagation of high-frequency electromagnetic waves worsens
Solution Approach 1:
The opening is divided into a first section and a second section by a partition structure, creating multiple pathways for airflow while maintaining shielding effectiveness. This segmentation allows larger overall opening area for improved airflow while the partition structure prevents high-frequency electromagnetic wave propagation.
Solution Approach 2:
The partition structure extends in the depth dimension of the opening, creating a three-dimensional configuration that allows larger cross-sectional area for airflow while the extended depth of the partition structure provides effective shielding against high-frequency electromagnetic waves.
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 allows for larger air vents for thermal mitigation while maintaining or enhancing the shielding ability against high-frequency electromagnetic waves, effectively balancing thermal management and electromagnetic interference protection.
Implementation Method 1
Incorporating obstructions within the openings of the EMI shield that function as waveguide structures and modal filters, increasing the cutoff frequency and maintaining shielding effectiveness
Implementation Method 2
Incorporating obstructions within the openings of the EMI shield that function as waveguide structures and modal filters, increasing the cutoff frequency and maintaining shielding effectiveness
Data Source
AI summary
Examples described herein include an electromagnetic interference shield. In some examples, the electromagnetic interference shield includes a wall comprised of a conductive material. The wall may have a first surface, a second surface, and a thickness between the first surface and the second surface. The shield may include a rounded opening in the wall that creates an air passageway through the thickness of the wall. The shield may also include a first obstruction in the opening and a second obstruction in the opening. The first obstruction may span across the opening. The second obstruction may span across the opening and intersect the first obstruction. The first obstruction and the second obstruction may be waveguide structures.