Antenna Output Power Control Using Grip Sensor Thresholds
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Solution Overview
Problem
Existing electronic devices face a trade-off between satisfying SAR standards and maintaining wireless communication performance due to inaccurate detection of human body contact, leading to unnecessary transmission power backoff.
Innovation Solution
An electronic device with a grip sensor and processor that determines antenna output power based on multiple sensing values and use states to accurately differentiate between human body contact and other objects, thereby optimizing SAR compliance and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the output power of the antenna is decreased to satisfy SAR standards, then the harmful effects on human body are reduced, but the transmission performance of wireless signal deteriorates
Solution Approach 1:
The system dynamically changes the antenna output power parameter based on detected conditions. When a human body is detected through the grip sensor, the output power is reduced to satisfy SAR standards; when no human body is present, the output power is increased to optimize wireless signal transmission performance. This conditional parameter adjustment resolves the contradiction by adapting the power level to the actual situation.
2Object-affected harmful factors
If the grip sensor threshold is set to detect human body contact, then SAR compliance can be achieved, but false detection of non-human objects causes unnecessary transmission power backoff
Solution Approach 1:
The system uses dynamic multi-threshold detection instead of a fixed threshold. It compares the grip sensor value against multiple reference values (first reference value for non-human objects, second reference value for human bodies) and adjusts the detection criterion dynamically. This allows the system to distinguish between human bodies and non-human objects, preventing false detection and unnecessary power backoff while maintaining SAR compliance when appropriate.
3Object-affected harmful factors
If transmission power backoff is performed based on grip sensor value exceeding reference value, then SAR standard can be satisfied, but wireless communication performance deteriorates due to unnecessary power reduction
Solution Approach 1:
The system implements feedback control by continuously monitoring the grip sensor value and comparing it against reference values, then adjusting the transmission power accordingly. The feedback loop includes: detecting grip sensor value, comparing with first reference value to determine if non-human object is present, comparing with second reference value to determine if human body is present, and adjusting output power based on these comparisons. This feedback mechanism ensures power backoff occurs only when necessary for SAR compliance, maintaining optimal communication performance otherwise.
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 ensures compliance with SAR standards while maintaining optimal wireless communication performance by accurately distinguishing between human body contact and other objects, preventing unnecessary power backoff.
Implementation Method 1
a grip sensor configured to sense an external object that is in contact or proximity
Data Source
AI summary
An electronic device according to certain embodiments may include a housing, an antenna disposed in the housing or formed in a part of the housing, a grip sensor configured to sense an external object that is in contact or proximity, and a processor operatively connected to the antenna and the grip sensor, wherein the processor may be configured to, when a first sensing value from the grip sensor is less than or equal to a first reference value, determine an output power of the antenna to be a first intensity; when the first sensing value exceeds the first reference value and a second sensing value from the grip sensor received after the first sensing value is between the first reference value and a second reference value higher than the first sensing value, determine whether the electronic device is in a state of use, and when the electronic device is not in the state of use, determine, based on a third reference value and a third sensing value of the grip sensor received after the second sensing value, the output power of the antenna to be the first intensity or a second intensity lower than the first intensity.