Power Adjusting Module for Wearable Antenna SAR Compliance
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Solution Overview
Problem
Wearable devices face challenges in reducing antenna radiating power while maintaining efficiency to meet specific absorption rate (SAR) test standards.
Innovation Solution
A power adjusting module with a sensor and central processing unit (CPU) system that determines the device's wearing mode or free mode, adjusting RF antenna transmission power accordingly, using various sensors such as gravity, light, pulse wave, or cardiogram sensors to detect user interaction and control power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If antenna radiating power is decreased to meet SAR test standards, then safety is improved, but radiating efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the antenna radiating power adjustable rather than fixed. The system dynamically changes the radiating power based on detected wearing status - using higher power when not worn to maintain efficiency and lower power when worn to comply with SAR standards. This dynamic adjustment resolves the contradiction between maintaining efficiency and ensuring safety.
Solution Approach 2:
The patent implements feedback through sensors (gravity, light, pulse wave, or cardiogram) that continuously monitor the wearing status and feed this information back to the control unit. The control unit uses this feedback to automatically adjust the antenna radiating power, creating a closed-loop system that maintains both efficiency and safety based on real-time conditions.
2Measurement precision
If multiple sensors are used to detect wearing mode, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional sensor system where different sensors (gravity, light, pulse wave, cardiogram) can be used individually or in combination to detect wearing mode. The control unit is designed to accommodate various sensor types and process their outputs, making the system versatile and adaptable while maintaining high measurement precision through the ability to select or combine appropriate sensors.
Data Source
AI summary
A power adjusting module applied in a wearable device and includes a sensor, a central processing unit (CPU). The sensor triggers a detect signal. The CPU determines if the wearable device is in a wearing mode or a free mode according to the detect signal. If the wearable device is determined in a wearing mode, the CPU generates an instruction for increasing a transmission power of an antenna of the wearable device; if the wearable device is determined in a free mode, the CPU generates an instruction for decreasing the transmission power of the antenna. A wearable device employing the power adjusting module is also provided.