Non-segmented Metal Case Antenna Design for Thin Devices
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Solution Overview
Problem
The use of a metallic case in electronic devices can degrade antenna performance due to human body contact, as it can alter the antenna's characteristics and reduce its ability to transmit or receive signals effectively, especially in thin and large-screen devices that require improved impact resistance.
Innovation Solution
An electronic device design that incorporates a non-segmented metal case forming the outer frame, which operates as a grounding area, radiator, or impedance matching element for the antenna, with a nonmetal area between the metal case and substrate to minimize performance degradation upon contact. This design includes a substrate with a grounding area and feeding units for the antenna radiator, and a non-segmented metal case that is connected at specific points for improved antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic case is used to improve impact resistance, then device durability is improved, but antenna performance is degraded
Solution Approach 1:
The metal case is divided into multiple segments separated by segmentation structures, allowing the case to maintain structural integrity and impact resistance while creating isolated antenna elements that prevent performance degradation through electrical isolation
Solution Approach 2:
Segmentation structures are introduced as intermediary elements between metal case segments, serving as both mechanical connectors for structural strength and electrical isolators for antenna performance protection
2Area of stationary object
If a segmented metal case is used as antenna, then antenna coverage area is increased, but antenna performance is degraded when body contacts the segmentation structure
Solution Approach 1:
Different regions of the metal case serve different functions: some areas form continuous antenna elements for signal transmission, while segmentation structures in other areas provide electrical isolation to prevent performance degradation from body contact
Solution Approach 2:
The metal case is strategically segmented to create isolated antenna elements that maintain electrical independence, preventing body contact from altering the overall antenna characteristics while preserving large coverage area
3Reliability
If the metal case is made non-segmented, then antenna performance stability is improved, but device durability and impact resistance are reduced
Solution Approach 1:
The metal case incorporates segmentation structures that are positioned to provide electrical isolation for antenna elements while maintaining mechanical continuity for structural strength and impact resistance
Solution Approach 2:
The segmentation structures serve dual functions: they act as mechanical support elements for device durability and as electrical isolators for antenna performance stability, simultaneously addressing both requirements
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 solution maintains or enhances antenna performance even when the metal case is contacted by a human body, ensuring robustness and reliable signal transmission/reception across various frequency bands, while also providing improved durability to the device.
Implementation Method 1
The electronic device may radiate radio waves (signals) to free space (e.g., air) or may receive radio waves from the free space using the antennas
Implementation Method 2
a nonmetal area between the metal case and substrate to minimize performance degradation upon contact
Data Source
AI summary
An electronic device having an antenna is provided. The electronic device includes a substrate including a grounding area, a non-grounding area and at least one feeding unit for feeding an antenna radiator, and a non-segmented metal cover forming an outer frame of the electronic device and operating as a part of the antenna.