Antenna Group SAR Reduction via Dynamic Selection
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Solution Overview
Problem
Existing mobile terminal technologies fail to reduce Specific Absorption Rate (SAR) effectively without compromising communication quality, as methods like reducing transmitter power or using wave-absorbed materials often impair signal transmission.
Innovation Solution
A mobile terminal with an antenna group, control unit, and input unit that detects the user's location and selects an antenna with a lower SAR value from pre-tested location-specific absorption rate information to connect with the radio-frequency circuit, ensuring reduced radiation to the human body while maintaining high-quality communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmitter power is reduced or wave-absorbed materials are used to reduce SAR, then radiation safety to human body is improved, but communication signal quality deteriorates
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna elements (first antenna and second antenna) with different radiation patterns. By segmenting the antenna function, the system can selectively activate specific antenna elements based on user position, thereby reducing SAR in certain directions while maintaining communication quality through diverse radiation coverage.
Solution Approach 2:
The patent implements dynamic antenna selection based on real-time detection of user position relative to the mobile terminal. The control unit dynamically switches between different antenna elements or combines them differently according to the detected user location, making the radiation pattern adaptive and dynamic rather than static, thus optimizing the balance between SAR reduction and communication quality.
2Object-affected harmful factors
If conventional SAR reduction methods are applied, then radiation hazard is reduced, but communication quality is compromised
Solution Approach 1:
The patent applies different radiation characteristics to different spatial regions by using multiple antenna elements with distinct radiation patterns. Each antenna element is optimized for specific directional coverage, allowing the system to reduce radiation hazard toward the user's head while maintaining strong signal transmission in other directions, thus achieving localized optimization of both safety and communication quality.
Solution Approach 2:
The patent changes the radiation parameters (amplitude, phase, directionality) by dynamically selecting and combining different antenna elements based on user position. This parameter adjustment allows the system to modify its radiation pattern in real-time, reducing SAR when user proximity is detected while maintaining communication effectiveness through adaptive parameter optimization.
Data Source
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AI summary
A mobile terminal and a method for reducing a specific absorption rate are disclosed. The mobile terminal includes: an input unit, a control unit, a memory, a switch, an antenna group and a radio-frequency circuit, wherein: the control unit is connected to the input unit, the memory and the switch, the antenna group contains multiple antennas, and the switch is connected to each antenna and the radio-frequency circuit; the input unit is configured to: detect a location of the mobile terminal relative to a user, and notify the control unit of the location obtained by detection; the memory is configured to: store location-specific absorption rate corresponding information of each antenna; and the control unit is configured to: according to the location obtained by the detection of the input unit, search the location-specific absorption rate corresponding information of each antenna stored in the memory for a specific absorption rate of each antenna in the antenna group at the location obtained by the detection, select an antenna according to the specific absorption rate of each antenna at the location obtained by the detection, and control the switch to connect the selected antenna with the radio-frequency circuit.