Heat Pipe RF Filter Structure for RFI Mitigation
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Solution Overview
Problem
Current heat pipes in electronic devices act as antennas, amplifying radio frequency interference (RFI) and causing noise, which affects device performance and increases thermal challenges, and existing solutions like grounding or EMI absorbers are inadequate or costly.
Innovation Solution
Incorporating electrically conductive bumps on the heat pipe to create an RF filter that mitigates RFI by configuring the conductance and capacitance of the bumps to resonate at specific frequencies, reducing the need for physical grounding and minimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat pipes are used for thermal management, then heat dissipation is achieved, but radio frequency interference is amplified due to the heat pipe acting as an antenna
Solution Approach 1:
The heat pipe surface is segmented by adding electrically conductive bumps that create multiple small reference planes, effectively dividing the continuous antenna structure into smaller segments that reduce RFI amplification while maintaining thermal conduction pathways
Solution Approach 2:
The heat pipe is modified with localized conductive bumps at specific positions and orientations to create electromagnetic reference planes that counteract RFI, while the rest of the heat pipe maintains its original thermal conduction properties for efficient heat dissipation
2Object-affected harmful factors
If grounding or EMI absorbers are added to reduce RFI, then radio frequency interference is mitigated, but device complexity and cost increase
Solution Approach 1:
The RFI mitigation function is merged with the existing heat pipe structure by adding conductive bumps directly to the heat pipe surface, combining thermal management and electromagnetic interference reduction into a single integrated component, thereby avoiding additional grounding structures or EMI absorbers
Solution Approach 2:
The heat pipe is transformed into a multi-functional component that simultaneously performs heat dissipation and RFI mitigation through the addition of conductive bumps that create electromagnetic reference planes, eliminating the need for separate single-function components
3Object-affected harmful factors
If EMI absorbers are used to reduce RFI, then radio frequency interference is mitigated, but manufacturing cost increases
Solution Approach 1:
The conductive bumps are made from inexpensive conductive materials and can be manufactured using cost-effective processes such as screen printing, sputtering, or bonding, replacing expensive EMI absorber materials with cheaper conductive inks or coatings that achieve the same RFI mitigation effect
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 RF filter effectively reduces RFI noise along the heat pipe, improving device performance and thermal management without increasing cost or space requirements.
Implementation Method 1
configuring the conductance and capacitance of the bumps to resonate at specific frequencies
Implementation Method 2
create an RF filter that mitigates RFI by configuring the conductance and capacitance of the bumps
Implementation Method 3
heat pipe to help reduce radio frequency interference
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
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.