Heat Pipe Bump Structure for RF Interference Filtering
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Solution Overview
Problem
Current heat pipes in electronic devices often act as antennas for radio frequency interference (RFI), amplifying noise and causing interference with radiation-sensitive components, and existing solutions like grounding or EMI absorbers are either ineffective or costly, and fail to adequately mitigate high-frequency RFI while maintaining thermal management.
Innovation Solution
Incorporating electrically conductive RFI bumps on the heat pipe to create a physical RF filter, which acts as an LC filter tuned to specific RF bands, reducing RFI amplification without the need for physical contact to the PCB ground plane, thus mitigating RFI effects while maintaining heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat pipes are used for thermal management, then heat transfer efficiency is maintained, but radio frequency interference is amplified and harmful to radiation-sensitive components
Solution Approach 1:
The patent introduces an electrically conductive material layer as an intermediary between the heat pipe and the PCB ground plane. This intermediary layer serves dual functions: it maintains thermal conduction for heat dissipation while simultaneously providing electromagnetic shielding to block RFI from reaching radiation-sensitive components. The conductive material acts as a mediator that reconciles the conflicting thermal management and EMI shielding requirements.
Solution Approach 2:
The patent employs composite material construction by combining the heat pipe structure with an additional electrically conductive material layer. This composite approach creates a multi-functional component that integrates both thermal management capabilities and electromagnetic interference shielding properties, allowing the heat pipe to simultaneously dissipate heat and block RFI without compromising either function.
2Object-generated harmful factors
If grounding or EMI absorbers are used to mitigate RFI, then interference is reduced, but manufacturing costs increase and thermal management effectiveness is compromised
Solution Approach 1:
The patent makes the heat pipe multi-functional by adding the electrically conductive material layer, enabling it to perform both thermal management and EMI shielding functions simultaneously. This eliminates the need for separate EMI shielding components or absorbers, thereby reducing overall manufacturing costs while maintaining RFI mitigation effectiveness. The universal design integrates multiple functions into a single component.
Solution Approach 2:
The patent merges the thermal management function and EMI shielding function into a single integrated solution. By combining the heat pipe with the conductive material layer, the design consolidates what would traditionally require separate components (heat pipe + EMI shield/absorber) into one unified structure, simplifying manufacturing and reducing costs while achieving both objectives.
3Object-generated harmful factors
If EMI absorbers are used to reduce RFI, then interference is mitigated, but heat transfer efficiency is compromised
Solution Approach 1:
The electrically conductive material layer serves as an intermediary that allows thermal energy to pass through while blocking electromagnetic interference. Unlike EMI absorbers that may impede heat flow, this conductive layer maintains thermal pathways while providing electromagnetic shielding, thus preserving heat transfer efficiency while mitigating RFI.
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 RFI bumps effectively filter out RFI noise across multiple RF bands, reducing interference without increasing manufacturing costs or compromising thermal management, and can be optimized for specific frequency bands and form factors to fit within compact electronic device designs.
Implementation Method 1
a heat pipe coupled to the heat source, wherein the heat pipe comprises a plurality of bumps
Implementation Method 2
maintaining heat transfer efficiency
Implementation Method 3
the bumps help reduce the radio frequency interference that travels along the heat pipe by providing a resonant frequency in a specific radio frequency band
Implementation Method 4
a heatsink coupled to the heat pipe
Implementation Method 5
a heatsink coupled to the heat pipe
Data Source
AI summary
Particular embodiments described herein provide for an electronic device that can be configured to include a substrate, a heat source on the substrate, and a heat pipe. The heat pipe includes a plurality of bumps that extend from the heat pipe towards the substrate but do not come into contact with the substrate. The bumps are configured to help mitigate radio frequency interference in the electronic device. More specifically, the bumps can be configured to provide a resonant frequency in a specific radio frequency band and act as a radio frequency filter.