Transmitting Antenna Proximity Detection for SAR-Compliant Throughput
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Solution Overview
Problem
Computing devices with antennas placed near user-facing areas face issues such as reduced wireless throughput and SAR compliance challenges due to human body proximity, leading to unnecessary power reduction and latency in antenna switching, and the use of proximity sensors increases cost and space.
Innovation Solution
Implement user alerts based on proximity sensor data and received signal strength to educate users about body proximity, and use RF leakage scans to manage SAR compliance without power reduction, optimizing antenna placement and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proximity sensors are added to detect human body proximity for SAR compliance, then SAR regulation compliance is improved, but device cost and space consumption increase
Solution Approach 1:
The system uses existing antenna signal characteristics (received signal strength, RF leakage scans) to detect human body proximity and determine SAR state, eliminating the need for separate proximity sensors. The antenna itself serves the dual purpose of wireless communication and SAR detection.
Solution Approach 2:
The existing antenna and baseband modem are made multi-functional by using them not only for wireless communication but also for detecting human body proximity through RF leakage scans and received signal strength measurements, thereby complying with SAR regulations without adding dedicated sensors.
2Reliability
If transmit power is reduced to comply with SAR regulations when human body is near antenna, then SAR compliance is improved, but wireless throughput deteriorates
Solution Approach 1:
The system dynamically adjusts transmit power based on real-time detection of human body proximity using RF leakage scans and received signal strength. When no body is detected, full transmit power is used for optimal throughput; when body proximity is detected, power is reduced to comply with SAR regulations.
Solution Approach 2:
The system changes the transmit power parameter dynamically based on the detected SAR state. By monitoring signal characteristics and determining when a SAR condition exists, the system adjusts power levels to maintain both compliance and performance.
3Productivity
If antenna switching is performed to maintain throughput during SAR events, then wireless throughput is improved, but latency increases due to network scan requirements
Solution Approach 1:
The system performs RF leakage scans continuously or periodically to pre-detect potential SAR conditions before they affect throughput. This allows the system to proactively manage antenna selection and power levels, avoiding the latency associated with reactive network scans after SAR events occur.
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
Enhances user experience by maintaining throughput and compliance with SAR regulations while reducing reliance on costly sensors and latency in antenna management.
Implementation Method 1
a capacitive proximity sensor, an inductive proximity sensor
Implementation Method 2
the overall rate at which energy is absorbed per unit mass by a human body when exposed to the transmitted radio frequency (RF) electromagnetic field
Data Source
AI summary
Various principles and methods are described herein to improve wireless communication in a user computing device. Certain aspects of the disclosure describe management of wireless transmissions relative to various regulations related to a specific absorption rate. Other aspects of the disclosure relate to detection of user proximity to a transmitting antenna. Other aspects relate to alternative strategies to improve wireless communication, such as selection of alternate antennas or baseband modems, or changes in device orientation.