Adaptive Antenna Impedance and Gain Control for SAR Limits
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Solution Overview
Problem
Conventional electronic devices reduce transmission power based solely on frequency band, leading to antenna performance deterioration without considering the device's state, potentially violating specific absorption rate regulations.
Innovation Solution
An electronic device with an amplification circuit, antenna, and a variable element, controlled by a circuit that adjusts impedance and gain based on the device's state and proximity to external objects, to selectively reduce transmission power while maintaining antenna performance and compliance with SAR regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced based only on frequency band, then SAR regulations are complied with, but antenna performance deteriorates
Solution Approach 1:
The patent implements dynamic transmission power control by detecting the device state (gripped or not gripped) and adjusting the transmission power accordingly. When the device is detected as being gripped, the transmission power is reduced to comply with SAR regulations; when not gripped, the transmission power is maintained at higher levels to ensure optimal antenna performance. This dynamic adjustment resolves the contradiction between SAR compliance and antenna performance.
Solution Approach 2:
The patent changes the transmission power parameter based on the detected device state. By identifying whether the device is in a gripped state through sensor detection, the system adjusts the transmission power parameter to different levels, thereby achieving both SAR compliance when needed and optimal performance when appropriate.
2Object-affected harmful factors
If transmission power is reduced to comply with SAR regulations, then safety is improved, but communication performance deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time device state detection. When the device is gripped, transmission power is reduced for safety; when not gripped, transmission power is increased to maintain communication performance. This resolves the contradiction between safety and communication performance.
Solution Approach 2:
The patent employs feedback mechanisms where sensors detect the device state (gripped or not gripped) and this information is fed back to the transmission power control system. Based on this feedback, the transmission power is adjusted accordingly, ensuring both safety compliance and communication performance are optimized based on actual conditions.
3Productivity
If transmission power is maintained at high level, then communication performance is improved, but SAR regulations are violated
Solution Approach 1:
The patent implements dynamic transmission power control that adjusts power levels based on detected device state. When gripping is detected, power is reduced for SAR compliance; when not gripping, power is maintained high for communication performance. This resolves the contradiction between communication performance and SAR compliance.
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 effectively reduces transmission power in accordance with the device's state and frequency band, minimizing antenna deterioration and ensuring compliance with SAR regulations, thereby enhancing communication performance and safety.
Implementation Method 1
output a signal amplified by a designated gain using the amplification circuit
Implementation Method 2
a variable element configured to adjust an impedance between the amplification circuit and the antenna
Implementation Method 3
Electronic devices may radiate electromagnetic signals for wireless communication with external devices
Data Source
AI summary
Various embodiments of the present invention relate to an electronic device and a method for controlling transmission power, the electronic device comprising: an amplification circuit; an antenna electrically connected to the amplification circuit; a variable element capable of adjusting the impedance between the amplification circuit and the antenna; and a control circuit, wherein the control circuit can be configured to: output a signal, having been amplified by a designated gain by means of the amplification circuit, to an external electronic device by using the antenna, in a state in which the variable element is adjusted to a first impedance; detect the approach of an external object during outputting of the signal; in response to the detection of the approach of the external object, check control information by which the first impedance of the variable element can be changed to a second impedance; and adjust the designated gain on the basis of at least the control information.