Multi-Antenna SAR Detection with Isolated Channels for Exposure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing number of antennas in mobile terminals due to 5G technology leads to higher specific absorption rate (SAR) exposure of human tissues and organs to electromagnetic radiation, as existing technologies lack efficient methods to detect and reduce SAR across multiple antennas simultaneously.
Innovation Solution
A device comprising an SAR sensor, first and second capacitance limitation modules, and signal isolation modules is used to detect SAR on multiple antennas, with separate detection channels and signal isolation to prevent interference, allowing independent power control based on proximity to the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to support 5G technology, then communication capability is improved, but SAR exposure of human tissues to electromagnetic radiation increases
Solution Approach 1:
The patent divides the monitoring and control system into multiple independent detection channels, with each channel dedicated to monitoring SAR levels from a specific antenna. This segmentation allows individualized power control for each antenna based on its specific SAR contribution, enabling the system to maintain multiple antennas for 5G capability while controlling overall SAR exposure through selective power adjustment of individual antennas.
2Productivity
If multiple antennas operate simultaneously, then communication performance is improved, but detection and measurement of SAR becomes more complex
Solution Approach 1:
The patent implements separate detection channels for each antenna, with each channel independently measuring SAR levels from its associated antenna. This segmentation of the detection system simplifies the overall measurement process by breaking down the complex multi-antenna SAR detection into multiple simple, independent single-antenna measurements, making the system manageable despite multiple simultaneous antennas.
Solution Approach 2:
The patent introduces signal isolation modules as intermediary components between the antennas and detection channels. These isolation modules prevent electromagnetic interference between multiple antennas from affecting the accuracy of SAR measurements, enabling reliable detection even when multiple antennas operate simultaneously by mediating their interactions.
3Measurement precision
If separate detection channels are used for each antenna, then SAR detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the detection system with universal, standardized detection channels that can be replicated and reused for each antenna. Rather than creating entirely unique detection circuits for each antenna, the system uses identical or similar detection channel designs that can be systematically applied across multiple antennas, reducing overall complexity through standardization while maintaining the precision benefits of separate detection channels.
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
The solution enables flexible and cost-effective reduction of SAR by synchronously detecting SAR signals from multiple antennas, reducing transmission power where necessary, thus minimizing electromagnetic exposure without increasing hardware costs.
Implementation Method 1
determining the closeness of a human body to an antenna corresponding to a detection channel according to an SAR signal obtained by each detection channel
Implementation Method 2
isolate radio frequency signals on a radio frequency path between the one of antennas 5 and the power control circuit 6 and to transmit SAR signals of the antenna 5
Data Source
AI summary
The present application relates to a device and a method for detecting SAR and a mobile terminal. The device includes: an SAR sensor, a plurality of first capacitance limitation modules, a plurality of second capacitance limitation modules, and a plurality of signal isolation modules. The SAR sensor includes a plurality of detection ports and each detection port is configured to perform SAR detection on one antenna. The first end and second end of each first capacitance limitation module are connected to the antenna and the detection port respectively. The first end and second end of each second capacitance limitation module is connected to the detection port and a power control circuit respectively. The first end of each signal isolation module is connected to the antenna; the second end of each signal isolation module is connected to the detection port.