Phased-Array Antenna Grip Sensing for EM Exposure Control
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Solution Overview
Problem
Wireless devices face challenges in minimizing electromagnetic exposure to users during signal transmission, as existing methods do not effectively self-detect lateral electromagnetic exposure and adjust signal transmission power to comply with safety limits, potentially leading to adverse health effects.
Innovation Solution
The implementation of a wireless device with phased-array antenna modules that self-detect lateral electromagnetic exposure by measuring coupling or leakage between antenna modules, determining exposure-limit-compliant maximum transmit power levels for each antenna module and radiation beam pattern, and adjusting signal transmission accordingly to ensure user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device transmits signal at high power to improve communication performance, then the signal transmission quality is improved, but the electromagnetic exposure to the user increases beyond safety limits
Solution Approach 1:
The patent implements dynamic adjustment of transmit power levels based on real-time detection of user grip location and lateral electromagnetic exposure measurements. The system transitions from static power transmission to dynamic power control, continuously adapting the transmit power to maintain communication quality while staying within SAR limits at detected grip locations.
Solution Approach 2:
The system employs feedback mechanisms by measuring lateral electromagnetic coupling between antenna modules and detecting object proximity at various device locations. These measurements feed back to the power control algorithm, which adjusts transmit power levels accordingly to prevent excessive electromagnetic exposure while maintaining reliable signal transmission.
2Reliability
If the wireless device uses multiple antenna modules to improve signal coverage and reliability, then the communication reliability is improved, but the complexity of detecting and managing electromagnetic exposure increases
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna modules, each capable of individual power control. By segmenting the overall antenna array into smaller units, the system can independently manage electromagnetic exposure from each module, simplifying the detection and control complexity while maintaining overall signal coverage through coordinated operation of multiple segments.
Solution Approach 2:
The system applies local quality control by determining exposure-limit-compliant maximum transmit power levels for each individual antenna module and radiation beam pattern. Instead of applying a uniform power limit across all antennas, the system optimizes power levels locally for each antenna module based on its specific orientation, location, and detected lateral coupling characteristics.
3Object-affected harmful factors
If the wireless device performs real-time detection of lateral electromagnetic exposure to ensure user safety, then the user safety is improved, but the device operation complexity and processing time increase
Solution Approach 1:
The patent implements preliminary action by pre-determining exposure-limit-compliant maximum transmit power levels for each antenna module and radiation beam pattern combination. This pre-computation of safe power levels occurs before actual operation, allowing the system to quickly select appropriate power levels during real-time operation without performing complex calculations, thus maintaining user safety while simplifying real-time device operation.
Solution Approach 2:
The system performs self-service by autonomously detecting lateral electromagnetic coupling and object proximity, then automatically adjusting its own transmit power levels without requiring external intervention. The wireless device monitors its own electromagnetic exposure characteristics and self-regulates power transmission to ensure compliance with safety limits, reducing the need for complex external control systems.
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
This solution effectively reduces electromagnetic exposure to users by determining and adhering to safety limits, preventing excessive power density at grip locations and ensuring compliance with exposure limits, thereby minimizing health risks.
Implementation Method 1
measuring a set of electromagnetic coupling or leakage values between the set of antenna modules, respectively
Implementation Method 2
transmits a signal to a target device, such as a base station, wireless router, or other device, for communicating data to the target device. The transmitted signal is an electromagnetic signal.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
An apparatus including a housing; sensors configured to sense one or more locations upon which a user is gripping the housing; sensors including antenna modules configured to transmit a signal based on the one or more locations upon which the user is gripping the housing. Another aspect relates to an apparatus including a housing; a set of antenna modules situated proximate at different surface locations along the housing; and a controller configured to operate the set of antenna modules to determine at least one or more electromagnetic leakage coupling between at least one pair of antenna modules of the set. In this aspect, the controller may be configured to select one or more of the set of antenna modules for transmitting a signal based on the one or more electromagnetic leakage coupling associated with one or more of the different locations where a user grips the housing, respectively.