Hinge Cavity Electric Field Trap Using Heat Exhaust Vent Grill
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Solution Overview
Problem
Existing information handling systems face challenges in creating a streamlined, full metal chassis that meets increasing wireless operation demands while minimizing thickness and avoiding the need for additional plastic components, which are costly and complex to manufacture.
Innovation Solution
The solution involves forming the outer chassis entirely of metal and co-locating an antenna with a metal exhaust grill within the base metal chassis, near the hinge between the display and base housing assemblies, which serves as a ground current path to trap electromagnetic radiation and prevent destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a full metal chassis is used to create a streamlined appearance, then aesthetic quality and structural strength are improved, but electromagnetic interference and signal degradation occur due to metal reflection and grounding issues
Solution Approach 1:
The metal chassis is segmented by introducing non-conductive elements (plastic antenna window, plastic trim pieces) that divide the continuous metal structure. These segments create electrical isolation zones that prevent electromagnetic interference while maintaining the overall streamlined metal chassis appearance.
Solution Approach 2:
Non-conductive plastic components serve as intermediary elements between the metal chassis and antenna elements. These intermediaries prevent direct electrical contact that would cause grounding issues and signal degradation, while still allowing the antenna to be integrated within the streamlined metal chassis structure.
2Object-affected harmful factors
If plastic components are added to the metal chassis to prevent electromagnetic interference, then signal quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The antenna window and trim pieces are merged into a single integrated assembly that is pre-assembled with the antenna element. This reduces the number of separate manufacturing steps and simplifies the overall manufacturing process while still providing the necessary electromagnetic interference protection.
Solution Approach 2:
The plastic components serve multiple functions simultaneously: they provide electromagnetic isolation, structural support for the antenna, aesthetic finishing, and sealing. This multi-functionality reduces the total number of components needed and simplifies manufacturing while effectively addressing interference issues.
3Length of moving object
If the antenna is integrated within the metal chassis structure, then device thickness is reduced and streamlined appearance is maintained, but antenna performance degrades due to metal cavity resonance and signal blocking
Solution Approach 1:
The metal chassis structure is modified locally around the antenna position by introducing non-conductive windows and trim pieces. These localized modifications create favorable electromagnetic conditions for antenna operation while maintaining the streamlined metal appearance in other areas, thus preserving both thin profile and antenna performance.
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 approach results in a more streamlined system with consistent antenna reception and transmission strength, reduced manufacturing complexity and cost, and minimizes noise interference, allowing for a larger video display without compromising wireless performance.
Implementation Method 1
the vents within the metal exhaust vent grill may be spaced and sized to trap a target frequency or set of frequencies... the metal exhaust vent grill may be used to trap excitation currents within the exhaust vent cavity
Data Source
AI summary
An information handling system to wirelessly transmit and receive data at an antenna includes a base metal chassis containing components of the information handling system, the base housing metal chassis including a C-cover and D-cover housing the components; a display chassis including an A-cover operatively coupled to the base metal chassis via a hinge; a vent cavity at an edge of the D-cover; a metal exhaust grill formed within the base metal chassis; an antenna element co-located within the vent cavity; and a ground current path forming an electric field trap via the metal exhaust grill to the D-cover of the base metal chassis in the thermal exhaust vent cavity to limit currents from resonating metal structures external to the vent cavity of the information handling system; and an antenna aperture to direct resonance with the antenna element out of the vent cavity.