Segmented Bezel Antenna Switching for Grip-Induced Signal Loss
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Solution Overview
Problem
The radiation performance of antennas in electronic devices is significantly deteriorated when a user grips the device, causing a change in capacitance and dielectric loss due to contact with the segmentation portion of the antenna.
Innovation Solution
A frame structure with insulating and conductive portions, switching circuits, and a proximity sensor to dynamically adjust power distribution to the conductive portions based on human body proximity, maintaining optimal antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal bezel is used as an antenna radiator, then the radiation performance is improved, but the capacitance changes and dielectric loss increases when a user grips the device
Solution Approach 1:
The metal bezel is divided into multiple conductive portions (first, second, third conductive portions) separated by insulating portions. This segmentation allows independent control of each conductive portion through switching circuits, enabling the system to maintain optimal radiation performance by selectively activating specific segments based on grip detection, thereby reducing the harmful effects of capacitance change and dielectric loss.
Solution Approach 2:
The antenna system transitions from a static configuration to a dynamic one by incorporating switching circuits that can change the electrical paths and power distribution in real-time. When a user grip is detected, the switching circuits dynamically reconfigure which conductive portions receive power, adapting the antenna's electrical characteristics to maintain radiation performance despite changes in the dielectric environment caused by user contact.
2Device complexity
If the antenna structure is simplified, then the device complexity is reduced, but the ability to maintain radiation performance under varying conditions is compromised
Solution Approach 1:
The metal bezel serves multiple functions: it acts as both the structural frame of the device and the antenna radiator. By integrating the antenna function into the existing bezel structure rather than adding a separate antenna component, the design achieves multi-functionality. The switching circuits and insulating portions are then used to provide the additional complexity needed to maintain radiation performance across different usage conditions.
Solution Approach 2:
The system changes electrical parameters (which conductive portions are active, power distribution levels) based on detected conditions. By using switching circuits to alter the electrical configuration of the segmented conductive portions, the system can adjust its parameters to maintain optimal radiation performance whether the device is being held or not, effectively managing the trade-off between structural simplicity and performance reliability.
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
Prevents degradation of radiation performance by dynamically adjusting electrical paths and power distribution to maintain effective communication, even when a user grips the device.
Implementation Method 1
a proximity sensor configured to detect a proximity of a human body with respect to the first edge
Implementation Method 2
a first switching circuit configured to connect the wireless communication circuit and at least one of the first conductive portion and the second conductive portion; a second switching circuit configured to connect the wireless communication circuit and at least one of the second conductive portion and the third conductive portion
Implementation Method 3
the frame structure including a first insulating portion disposed in the first edge, a second insulating portion disposed in the second edge, a third insulating portion disposed in the second edge
Implementation Method 4
a first conductive portion extending from the first insulating portion to the second edge, a second conductive portion spaced apart from the first conductive portion by the second insulating portion and corresponding to a part of the second edge, a third conductive portion spaced apart from the second conductive portion by the third insulating portion and extending to the third edge
Data Source
AI summary
An electronic device includes a frame structure forming at least a part of the side surface of the electronic device, the frame structure including a first insulating portion, a second insulating portion, a third insulating portion, a first conductive portion, a second conductive portion and a third conductive portion, a wireless communication circuit, a first switching circuit configured to connect the wireless communication circuit and at least one of the first conductive portion and the second conductive portion, a second switching circuit configured to connect the wireless communication circuit and at least one of the second conductive portion and the third conductive portion, and a proximity sensor configured to detect a proximity of a human body.