Thermally Conductive EMI Absorbers for Heat Dissipation and Field Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electronic devices face challenges in managing heat and electromagnetic interference (EMI) due to the need for separate materials with high thermal conductivity and EMI absorption capabilities, which can lead to increased complexity and inefficiency in thermal dissipation and EMI suppression.
Innovation Solution
Development of thermally-conductive EMI absorbers with thermal conductivity greater than 6 W/mK and attenuation greater than 15 dB/cm at 10 GHz, combining the functions of thermal interface materials and EMI absorbers in a single product, utilizing a matrix with functional fillers such as zinc oxide, silicon carbide, and aluminum nitride, and configured as gap filler pads, putty, or greases without silicone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate materials are used for thermal conduction and EMI absorption, then each function can be optimized independently, but the device complexity and number of components increase
Solution Approach 1:
The patent combines thermal conduction and EMI absorption functions into a single material by incorporating conductive filler particles (such as metal oxides, carbides, or nitrides) within an EMI-absorbing polymer matrix. This merging eliminates the need for separate thermal interface materials and EMI shielding layers, reducing component count while maintaining both thermal management and electromagnetic interference suppression capabilities
Solution Approach 2:
The developed thermally-conductive EMI absorber serves multiple functions simultaneously: it acts as a thermal interface material for heat dissipation, an EMI absorber for electromagnetic shielding, and a gap filler for mechanical compliance. This multi-functionality allows a single material to replace traditionally separate components, simplifying the overall device structure while ensuring reliable thermal and electromagnetic performance
2Object-affected harmful factors
If traditional EMI shields are used, then EMI absorption is achieved, but thermal conductivity is insufficient for effective heat dissipation
Solution Approach 1:
The patent employs composite material construction by dispersing thermally conductive filler particles (such as aluminum oxide, zinc oxide, silicon carbide, or boron nitride) throughout an EMI-absorbing polymer matrix. This composite structure enables the material to exhibit both EMI absorption characteristics from the polymer matrix and enhanced thermal conductivity from the filler particles, simultaneously addressing electromagnetic shielding and heat dissipation requirements
3Temperature
If high thermal conductivity materials are used, then heat dissipation is improved, but EMI absorption capabilities are reduced
Solution Approach 1:
The patent applies local quality by creating a heterogeneous material structure where thermally conductive filler particles are distributed within an EMI-absorbing polymer matrix. Different regions of the composite material serve different functions: the polymer matrix provides EMI absorption while the localized filler particles provide thermal conduction pathways. This spatial differentiation of properties allows the material to exhibit both high thermal conductivity and effective EMI absorption simultaneously
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 thermally-conductive EMI absorbers effectively establish a high thermal conductivity path while suppressing electromagnetic fields, providing a space-saving dual-purpose solution for thermal management and EMI reduction, suitable for various electronic applications including advanced driver-assistance systems and 5G infrastructure.
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). The thermally-conductive EMI absorbers effectively establish a high thermal conductivity path
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. The thermally-conductive EMI absorbers... suppressing electromagnetic fields
Data Source
AI summary
Disclosed are exemplary embodiments of thermally-conductive electromagnetic interference (EMI) absorbers. In exemplary embodiments, the thermally-conductive EMI absorber may have a thermal conductivity of at least 6 Watts per meter per Kelvin (W/mK) and an attenuation greater than 15 decibels per centimeter (dB/cm) at a frequency of 10 gigahertz (GHz) or higher.