Antenna Control for Mobile Terminals Reducing SAR
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Solution Overview
Problem
Existing methods for controlling antennas in mobile terminal devices, such as laptops and handheld PCs, often result in degraded communication speed or quality when attempting to reduce Specific Absorption Rate (SAR) due to the complexity of usage-based antenna selection and the need for multiple sensors, which is not suitable for devices with fewer usage scenarios like laptops and handheld PCs.
Innovation Solution
A method that determines the usage of a mobile terminal device based on display orientation, holding orientation, and installation status to selectively disable antennas, allowing for reduced SAR without degrading communication speed or quality, using sensors like acceleration sensors and docking sensors to control antenna output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If usage-based antenna selection method is applied to reduce SAR, then SAR properties are improved, but device complexity increases due to multiple sensors and complex control mechanisms
Solution Approach 1:
The patent extracts and removes unnecessary complex control mechanisms and multiple sensors from the antenna selection system. Instead of using multiple sensors to detect various usage states, the invention simplifies the approach by using a reduced sensor set combined with intelligent antenna control that adapts to different usage scenarios without requiring complex detection mechanisms.
Solution Approach 2:
The patent makes the antenna control system universal by designing it to handle multiple usage scenarios (voice calls, data transmission, camera mode, etc.) through a single simplified control mechanism. The system can automatically adapt to different usage types without requiring separate control logic for each scenario, thereby reducing overall device complexity while maintaining SAR reduction effectiveness.
2Object-affected harmful factors
If transmission output is reduced for any antenna to maintain preferable SAR properties, then SAR is improved, but communication speed and quality degrade
Solution Approach 1:
The patent implements dynamic antenna control where the system continuously monitors usage type and automatically switches between different antennas based on real-time conditions. This dynamic adaptation allows the system to maintain optimal transmission output for communication performance while selecting antennas that minimize SAR exposure, rather than permanently reducing transmission power.
Solution Approach 2:
The patent changes the operational parameters of the antenna system by switching between different antennas with different radiation patterns and SAR characteristics. Instead of changing transmission power, the system changes which antenna is active, thereby maintaining high transmission output when needed while keeping SAR within acceptable limits through appropriate antenna selection.
3Measurement precision
If complex control method with multiple sensors is used for antenna selection, then antenna selection accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service operation where the antenna control system automatically detects usage type and selects appropriate antennas without requiring user intervention. The simplified sensor system combined with intelligent control algorithms enables the device to autonomously adapt to different usage scenarios, making the system easy to operate while maintaining accurate usage detection.
Data Source
AI summary
A method for controlling antennas of a mobile terminal device such as a laptop PC and a handheld PC without degrading communication speed or quality and a mobile terminal device having such control are provided. The method comprises determining the usage of the mobile terminal device, determining an antenna to be disabled among the plurality of antennas according to the usage that is determined by the determining of usage, and disabling the antenna which is determined by determining of an antenna to be disabled, wherein the determining of usage determines usage based on the display orientation of the display unit of the mobile terminal device.