Graphene-Coated EMI Shield and Grounded Cable Clips for 5G Thermal Crosstalk
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Solution Overview
Problem
Portable information handling systems face challenges in managing crosstalk between coaxial cables and electromagnetic interference (EMI) due to the proximity of antennas and the generation of thermal energy from 5G radio operations, which can disrupt signal strength and processing power.
Innovation Solution
The use of cable clips with a conductive material interfaced with system ground to route coaxial cables and expose their ground sheaths, reducing crosstalk, combined with a graphene-coated EMI shield to manage thermal energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If coaxial cables are routed in proximity to each other to save space, then device compactness is improved, but crosstalk between cables increases disrupting signal strength
Solution Approach 1:
A cable clip made of conductive material is introduced as an intermediary component between coaxial cables. The cable clip provides a grounded shielding surface that intercepts electromagnetic fields from adjacent cables, preventing crosstalk while allowing cables to be routed in close proximity for compact housing design.
Solution Approach 2:
The grounding function is extracted and applied to the cable clip, which is separately connected to system ground. This isolated grounding structure specifically addresses the crosstalk problem without requiring redesign of the entire cable routing system or housing structure.
2Object-affected harmful factors
If EMI shielding is added around radios to reduce electromagnetic interference, then EMI levels are reduced, but thermal energy retention increases affecting processing power
Solution Approach 1:
The EMI shield is selectively applied only around high-interference components such as 5G radios and wireless communication modules, rather than enclosing the entire housing. This localized shielding approach reduces EMI at the source while minimizing the volume of enclosed space, allowing thermal energy to dissipate more effectively throughout the housing.
Solution Approach 2:
Instead of providing complete 360-degree shielding around radios, the patent applies partial shielding that covers the most critical interference pathways. This partial shielding action is sufficient to reduce EMI to acceptable levels while leaving thermal ventilation paths open.
3Reliability
If antenna coaxial cables are spaced apart to prevent surface current interference, then signal strength is improved, but cable routing complexity increases in small housings
Solution Approach 1:
The cable clip serves multiple functions simultaneously: it mechanically secures the coaxial cable to the housing, provides electromagnetic shielding through its conductive material, and establishes a grounded connection to prevent crosstalk. This multi-functionality simplifies the overall cable routing system despite the compact housing constraints.
4Temperature
If processing components are distributed throughout the housing to improve thermal management, then heat dissipation is improved, but EMI shielding requirements increase
Solution Approach 1:
The housing is segmented into functional zones: high-interference components like 5G radios receive localized EMI shielding, while other processing components are distributed throughout the housing for thermal management. This segmentation allows selective application of shielding only where necessary, balancing EMI protection with thermal dissipation.
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
This solution allows for more compact component placement, improved radio transmission and reception performance, and effective EMI and thermal management, reducing CPU operating temperature and EMI levels while maintaining a compact system design.
Implementation Method 1
cable clips having a conductive material and coupled to system ground, such as through a motherboard. The coaxial cables expose a ground sheath from under an outer covering at a coupling point with the cable clips to reduce crosstalk that can occur at the coaxial cable outer surface where reflections from the antenna pass through the cable ground sheath and disrupt radio signals
Implementation Method 2
A shield couples to the frame to enclose the radio in a Faraday cage that restricts leakage of undesired EMI. A graphene paint applied to the shield helps to dissipate excess thermal energy from within the enclosure defined by the frame and shield over the radio.
Implementation Method 3
A graphene paint applied to the shield helps to dissipate excess thermal energy from within the enclosure defined by the frame and shield over the radio.
Implementation Method 4
A shield couples to the frame to enclose the radio in a Faraday cage that restricts leakage of undesired EMI.
Data Source
AI summary
An information handling system EMI shield system couples to a circuit board to enclose an electronic device in a Faraday cage and includes a surface painted with a graphene paint to aid in dissipation of excess thermal energy from the electronic device. The EMI shield system has a frame that couples to the circuit board and interfaces with ground to define a boundary around an electronic device connector and has a shield that couples as a separate piece over the frame to enclose the electronic device. Graphene paint applied to some or all of the shield encourages rejection of excess thermal energy from within shield.