Antenna Selection for Mobile Devices to Mitigate User Grasp Interference
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Solution Overview
Problem
Conventional mobile devices with embedded antennas experience significant degradation in radiation properties due to user grasp, leading to poor call and data communication quality, as the antennas are often located in areas where user interaction occurs, such as near the microphone.
Innovation Solution
A mobile device equipped with at least two antennas and a sensor unit that detects user grasp, allowing the control unit to selectively switch between the antennas to maintain communication quality by routing signals through the antenna least affected by the user's hand position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna is embedded near the microphone to save space, then the device achieves better portability and smaller size, but the radiation property of the antenna degrades significantly due to user grasp
Solution Approach 1:
The patent divides the antenna system into multiple independent antennas (first antenna and second antenna) positioned at different locations within the device. This segmentation allows the system to select different antennas based on user grasp conditions, thereby maintaining radiation performance while keeping the device compact.
Solution Approach 2:
The patent implements dynamic antenna selection based on sensor feedback. The control unit dynamically switches between the first and second antennas according to the sensor signal indicating user grasp state, making the antenna system adaptive rather than static.
2Device complexity
If a single antenna is used to simplify the device structure, then the device complexity is reduced, but the communication quality deteriorates when the antenna is affected by user grasp
Solution Approach 1:
The patent implements dynamic antenna selection based on sensor feedback. The control unit dynamically switches between the first and second antennas according to the sensor signal indicating user grasp state, making the antenna system adaptive rather than static.
Solution Approach 2:
The patent incorporates a sensor unit that provides feedback about user grasp conditions to the control unit. This feedback mechanism enables the system to automatically adjust antenna selection based on real-time conditions, maintaining communication quality without requiring complex manual intervention.
3Reliability
If the antenna is positioned in a broader space near the microphone, then the radiation property is initially better, but the location is where users typically hold or press their face, causing sudden degradation in radiation property
Solution Approach 1:
The patent divides the antenna system into multiple independent antennas (first antenna and second antenna) positioned at different locations within the device. This segmentation allows the system to select different antennas based on user grasp conditions, thereby maintaining radiation performance while keeping the device compact.
Solution Approach 2:
The patent introduces a sensor unit as an intermediary between the user grasp action and the antenna selection process. The sensor detects user grasp conditions and transmits this information to the control unit, which then selects the appropriate antenna, effectively mediating the interaction between user behavior and antenna performance.
Data Source
AI summary
A mobile device having at least two antennas can circumvent transmission problems caused by a user's grasp of the device. A sensor unit is disposed at a specific location of a device body and creates a sensor signal by detecting the contact or proximity of a particular object such a user's hand. When receiving the sensor signal, a control unit selects one of the antennas depending on the sensor signal and establishes a communication path based on the selected antenna. The selected antenna involved in the communication path is typically relatively free from degradation in transmission caused by a user's grasp of the mobile device. The radiation property of the mobile device, which may be degraded due to a user's grasp, can exhibit relatively little or no degradation as compared to the typical degradation in performance when the mobile device is being grasped.