Patterned EMI Mitigation Materials Using Carbon Nanotubes
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Solution Overview
Problem
Current electronic devices face challenges in managing heat dissipation and electromagnetic interference (EMI) due to excessive heat generation and EMI radiation, which can lead to inefficient operation and signal degradation.
Innovation Solution
The development of patterned electromagnetic interference (EMI) mitigation materials incorporating carbon nanotubes, specifically single-walled and multi-walled carbon nanotubes, within a filled dielectric structure that provides both thermal conductivity and EMI absorption capabilities, including pyramidal structures with air-filled microballoons or microspheres to enhance thermal management and EMI mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional EMI shields are used to block electromagnetic interference, then EMI mitigation is improved, but thermal conductivity deteriorates due to the shielding material blocking heat transfer paths
Solution Approach 1:
The patent applies local quality by creating patterned regions with different carbon nanotube concentrations within the dielectric material. High CNT concentration regions provide EMI shielding, while low CNT concentration regions maintain thermal conductivity. This spatial variation in material properties allows simultaneous optimization of both EMI mitigation and heat transfer without requiring uniform material composition throughout.
Solution Approach 2:
The patent employs composite materials by combining carbon nanotubes with dielectric materials to create a hybrid structure. The carbon nanotubes provide both EMI shielding capabilities and enhanced thermal conductivity, while the dielectric material provides structural support and electrical insulation. This composite approach allows the material to simultaneously achieve EMI mitigation and maintain thermal management performance.
2Temperature
If thermal interface material is used to fill gaps between thermal transfer surfaces, then thermal transfer efficiency is improved, but EMI shielding capability deteriorates due to the insulating nature of TIM
Solution Approach 1:
The patterned carbon nanotube structure creates localized regions of high thermal conductivity within the TIM that also provide EMI shielding. By strategically positioning CNT-rich patterns at interfaces and heat transfer paths, the material simultaneously enhances thermal transfer while maintaining EMI mitigation capabilities, resolving the contradiction between TIM function and shielding performance.
Solution Approach 2:
The carbon nanotube-dielectric composite transforms the TIM from a purely thermal function to a dual-function material that provides both thermal management and EMI shielding. The carbon nanotubes contribute electrical conductivity and EMI absorption/reflection properties, while the dielectric matrix maintains thermal interface functionality, creating a material that performs both functions concurrently.
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
These materials effectively reduce EMI reflection by over 15 decibels across a broad frequency range (40 GHz to 120 GHz) while offering high thermal conductivity, thereby improving device performance and preventing signal degradation and overheating.
Implementation Method 1
The heat may pass from the operating electrical component to the heat sink either by direct surface contact between the electrical component and heat sink and/or by contact of the electrical component and heat sink surfaces through an intermediate medium or thermal interface material (TIM)
Implementation Method 2
These shields are typically employed to localize EMI/RFI within its source, and to insulate other devices proximal to the EMI/RFI source
Implementation Method 3
pyramidal structures with air-filled microballoons or microspheres to enhance thermal management and EMI mitigation
Implementation Method 4
patterned electromagnetic interference (EMI) mitigation materials incorporating carbon nanotubes, specifically single-walled and multi-walled carbon nanotubes, within a filled dielectric structure
Data Source
AI summary
Disclosed are exemplary embodiments of patterned electromagnetic interference (EMI) mitigation materials (e.g., EMI absorbers, thermally-conductive EMI absorbers, etc.) including carbon nanotubes. The carbon nanotubes may comprise single-walled carbon nanotubes, multi-walled carbon nanotubes, and/or carbon nanostructures comprising a branched network of crosslinked carbon nanotube structures. For example, an EMI mitigation material may comprise a filled dielectric including a pattern of EMI absorbers. The filled dielectric comprises carbon nanotubes.