Loop Metal Bezel Antenna for Slim Device Radiation
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Solution Overview
Problem
The challenge is to maintain antenna radiation performance in electronic devices with metal mechanical parts, such as metal housings and bezels, which often lead to deterioration due to scattering, electromagnetic field trapping, and mismatch effects, especially in slim and compact designs where separation distances are reduced.
Innovation Solution
The solution involves using a metal member in the shape of a loop as both a decoration and an antenna radiator, with a substrate providing power and grounding, and an inner housing with conductive patterns to adjust electrical lengths and ground locations, allowing the metal bezel to operate effectively across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal mechanical parts (housing, bezel) are used to increase strength and improve appearance, then device strength and appearance quality are improved, but antenna radiation performance deteriorates due to scattering, electromagnetic field trapping, and mismatch effects
Solution Approach 1:
The patent converts the harmful metal bezel into a beneficial antenna radiator. The metal bezel that originally caused scattering and field trapping effects is now utilized as the radiating element itself, with feed and ground connections established through the substrate and inner housing. This transforms the metal component from a source of interference into the primary antenna structure, achieving both aesthetic appeal and functional performance.
Solution Approach 2:
The metal bezel serves multiple functions simultaneously: it provides structural support and aesthetic appearance as a decorative element, while also functioning as the antenna radiator for wireless communication. The substrate and inner housing with conductive patterns enable the bezel to perform both mechanical and electromagnetic functions, eliminating the need for separate antenna components.
2Length of moving object
If device thickness is reduced to make it slimmer, then device portability is improved, but mounting space for antenna radiator and separation distance from metal components decrease, making it difficult to obtain sufficient antenna performance
Solution Approach 1:
The patent transitions the antenna structure from a planar configuration to a three-dimensional configuration by utilizing the vertical space between the substrate and the metal bezel. The inner housing with conductive patterns creates multiple ground connections at different heights and positions, establishing a volumetric electromagnetic structure that achieves sufficient radiation performance within the limited thickness of the device.
Solution Approach 2:
The patent implements a nested structure where the substrate is positioned within the device housing, the inner housing with conductive patterns is nested between the substrate and the metal bezel, and the antenna radiation structure is formed within this nested arrangement. This nested configuration maximizes the use of available space while maintaining proper separation and electrical connections.
3Reliability
If separate antenna mounting space is provided to ensure sufficient radiation performance, then antenna performance is improved, but device complexity and mounting space requirements increase
Solution Approach 1:
The patent merges the antenna radiator, decorative element, and structural component into a single integrated metal bezel structure. The feed network and ground connections are integrated into the substrate and inner housing, eliminating the need for separate antenna mounting spaces and reducing overall device complexity while maintaining sufficient radiation 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 configuration enhances radiation performance while maintaining device strength and appeal, eliminating the need for a separate antenna mounting space, thus contributing to the slimness and efficiency of the electronic device.
Implementation Method 1
a metal member in a shape of a loop which is disposed in at least one area of the electronic device... use the metal member as an antenna radiator
Implementation Method 2
at least one location of the metal member that differs from the power-supplied location is grounded through the substrate
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An antenna device implemented to prevent the deterioration in radiation performance due to a metal mechanical part and an electronic device including the same is provided. The electronic device includes a metal member in a shape of a loop that is disposed in at least one area of the electronic device and a substrate (printed circuit board (PCB)) for supplying power to a preset location of the metal member in order to use the metal member as an antenna radiator, wherein at least one location of the metal member that differs from the power-supplied location is grounded through the substrate.