Antenna Power Control for SAR Reduction via Proximity Sensing
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Solution Overview
Problem
Existing mobile communication devices do not effectively reduce the Specific Absorption Rate (SAR) of electromagnetic radiation emitted by antennas when in close proximity to the human body, leading to potential harm.
Innovation Solution
An apparatus comprising an antenna assembly and a sensing assembly that detects human body proximity and controls the antenna's input power to reduce radiation, maintaining original power when not close and lowering it when the body is near or in contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the antenna assembly maintains constant high input power, then communication signal strength is improved, but radiation exposure to the human body increases
Solution Approach 1:
The patent implements dynamic power adjustment by transitioning from constant high power to variable power levels based on real-time sensing. The sensing assembly continuously monitors human body proximity and dynamically adjusts the antenna's input power accordingly - maintaining high power when no body is detected and reducing power when body proximity is detected, thus resolving the contradiction between signal strength and radiation exposure
Solution Approach 2:
The patent establishes a feedback control loop where the sensing assembly provides real-time information about human body proximity to the power control mechanism. This feedback enables the system to automatically adjust antenna power based on detected conditions, ensuring communication quality is maintained while minimizing radiation exposure when appropriate
2Object-affected harmful factors
If the antenna assembly reduces input power when body is close, then radiation exposure is reduced, but communication signal strength may deteriorate
Solution Approach 1:
The system dynamically adjusts power based on operational context - maintaining high power for reliable communication when no body is present while switching to low power when body proximity is detected. This contextual dynamic adjustment ensures both communication reliability and radiation safety are satisfied under different operating conditions
Solution Approach 2:
The patent applies different power levels to different operational scenarios rather than using a uniform power setting. High power is applied locally to the communication function when safe, while low power is applied when body proximity requires radiation reduction, thus achieving both communication reliability and radiation protection
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
Effectively reduces radiation exposure to the human body while ensuring stable signal communication by dynamically adjusting antenna power based on body proximity.
Implementation Method 1
Document US 2014/0071022 A1 relates to a mobile terminal e.g. smart phone, having its ground spaced apart from a conductive unit and capacitive-coupled to the conductive unit
Implementation Method 2
SAR is the acronym of 'Specific Absorption Rate' which refers to the absorption ratio or absorption rate of the electromagnetic wave
Data Source
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AI summary
The present disclosure relates to an apparatus for intelligently reducing a specific absorption rate, a protective case and a terminal. The apparatus includes an antenna assembly (101, 301), a sensing assembly (102) being configured to determine an approach to or a contact of the antenna assembly (101, 301) by a human body; the sensing assembly (102) is also configured to control the antenna assembly (101, 301) for reduction of input power when detecting an approach to or a contact by a human body. By the above means, the apparatus is capable of lowering the input power automatically when the antenna (101, 301) is approached to the human body, therefore reducing the radiation to the human body and reducing the harm thereto.