Upper Antenna Power Control to Lower Mobile Phone SAR
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Solution Overview
Problem
Traditional mobile terminal antenna designs, particularly in all-metal 4G phones, cause significant radiation exposure when the user holds the phone, leading to adverse health effects due to elevated specific absorption rate (SAR) values when the main transceiver path is switched to the upper antenna during calls.
Innovation Solution
A method and system that detect when a mobile terminal is in a call and the main transceiver path is switched to the upper antenna, reducing the radio frequency transmit power of the upper antenna using a radio frequency chip to lower the SAR value and prevent radiation harm to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TAS technology switches the main transceiver path to the upper antenna, then call performance is improved, but radiation SAR value to user's head increases
Solution Approach 1:
The patent dynamically changes the transmit power parameter of the upper antenna based on detection results. When the mobile terminal is detected to be close to the user's head and the main transceiver path is switched to the upper antenna, the transmit power is reduced to lower the SAR value while maintaining call functionality
Solution Approach 2:
The patent implements a feedback mechanism where the mobile terminal continuously detects its proximity to the user's head and the status of the main transceiver path. Based on this feedback information, the system automatically adjusts the transmit power of the upper antenna to maintain SAR compliance while preserving call performance
2Object-affected harmful factors
If the mobile terminal reduces radio frequency transmit power of the upper antenna, then radiation SAR value is reduced, but call performance may be compromised
Solution Approach 1:
The patent dynamically adjusts the transmit power of the upper antenna based on real-time detection conditions. The power reduction is not static but adapts to the current operational state, ensuring call performance is maintained when possible while reducing SAR when necessary
Solution Approach 2:
The patent performs preliminary detection of the mobile terminal's proximity to the user's head and the status of the main transceiver path before executing power reduction. This preliminary action ensures that power is only reduced when both conditions are met (close to head and upper antenna is main transceiver), preventing unnecessary call performance degradation
Data Source
Figure 1~2
AI summary
A method and a system for reducing radiation damage from a mobile terminal are provided. The method includes the following steps: A, response to the mobile terminal being in a call answering state, if a main transceiver path of the mobile terminal is switched to an upper antenna, proceeding to step B; B, response to a detecting of a receiver of the mobile terminal, if the receiver of the mobile terminal is in a working state, proceeding to step C; C, reducing a radio frequency transmit power of the upper antenna of the mobile terminal, so as to reduce the amount of radiation damage caused by the mobile terminal to a user. When determining that the user is in a call while being close to the mobile terminal and that the main transceiver path is switched to the upper antenna, the present disclosure reduces the radio frequency transmit power of the upper antenna of the mobile terminal by a radio frequency chip, thereby reducing an SAR value so as to prevent the radiation of the mobile terminal from harming the user.