Antenna Signal Power Control via Phase Difference Detection
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Solution Overview
Problem
Existing electronic devices face challenges in accurately distinguishing between a user's body and external objects, leading to unnecessary reduction in signal strength and potential degradation of communication performance, as current sensors struggle to differentiate between human tissue and other materials based on capacitance changes.
Innovation Solution
An electronic device equipped with a sensor module, communication module, first and second antennas, and a processor that checks for external object proximity and adjusts signal power based on phase differences between transmitted and reflected signals to determine if the object is a user's body or a different material, thereby optimizing signal strength and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the signal strength is reduced based on grip sensor detection, then the specific absorption rate is reduced, but the communication performance deteriorates when the external object is not a user's body
Solution Approach 1:
The system changes the detection parameter from simple capacitance change to phase difference measurement. By measuring the phase difference between transmitted and reflected signals, the system can distinguish between human bodies (which absorb electromagnetic waves and produce specific phase differences) and other materials (which reflect signals with different phase characteristics), thereby avoiding unnecessary power reduction while maintaining SAR protection.
Solution Approach 2:
The system replaces the mechanical/electrical grip sensor detection method with an electromagnetic wave-based detection method. Instead of relying on capacitance changes from grip sensors, the system uses radio frequency signals to detect the presence and type of external objects through phase difference measurement, enabling more accurate discrimination between human bodies and other materials.
2Object-affected harmful factors
If the signal strength is reduced based on proximity detection, then the specific absorption rate is reduced, but unnecessary power reduction occurs when the external object is made of different materials
Solution Approach 1:
The system changes the detection parameter from simple capacitance change to phase difference measurement. By measuring the phase difference between transmitted and reflected signals, the system can distinguish between human bodies (which absorb electromagnetic waves and produce specific phase differences) and other materials (which reflect signals with different phase characteristics), thereby avoiding unnecessary power reduction while maintaining SAR protection.
Solution Approach 2:
The system implements feedback by transmitting test signals and analyzing the reflected signals' phase differences to determine the nature of external objects. This feedback mechanism allows the system to make informed decisions about whether to reduce signal power, ensuring that power reduction only occurs when actually needed for human safety rather than for all proximity detections.
3Ease of operation
If the capacitance-based grip sensor is used, then the device can detect user grasp, but it cannot differentiate between user's body and external objects made of different materials
Solution Approach 1:
The system changes the detection parameter from simple capacitance change to phase difference measurement. By measuring the phase difference between transmitted and reflected signals, the system can distinguish between human bodies (which absorb electromagnetic waves and produce specific phase differences) and other materials (which reflect signals with different phase characteristics), thereby avoiding unnecessary power reduction while maintaining SAR protection.
Solution Approach 2:
The system replaces the mechanical/electrical grip sensor detection method with an electromagnetic wave-based detection method. Instead of relying on capacitance changes from grip sensors, the system uses radio frequency signals to detect the presence and type of external objects through phase difference measurement, enabling more accurate discrimination between human bodies and other materials.
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 specific absorption rate of electromagnetic waves when the object is a user's body while preventing unnecessary power reduction when the object is not, thus enhancing communication performance and user safety.
Implementation Method 1
the electronic device senses whether a user grasps the electronic device in accordance with a change of capacitance of a capacitor included in the grip sensor
Implementation Method 2
The electronic device may output a signal for the communication using an antenna of the electronic device
Implementation Method 3
A part of the signal output from the antenna may be absorbed by a user who uses the electronic device. The degree of absorption of an electromagnetic wave being absorbed by the user's human body may be defined as a specific absorption rate (SAR)
Implementation Method 4
obtain a signal caused by the specified signal that is reflected by the external object using the second antenna
Data Source
AI summary
In an electronic device and a method for operation of the electronic device according to various embodiments, the electronic device may comprise: a sensor module for sensing whether an external object approaches the electronic device; a communication module for cellular communication; a first antenna for the cellular communication; a short-range wireless communication module for short-range wireless communication; a second antenna for the short-range wireless communication; and a processor, wherein the processor is configured to: check by means of the sensor module whether the external object approaches so as to be within a specified range, while transmitting a cellular signal with specified power through the first antenna; output a specified signal through the second antenna at least on the basis of determining that the external object has approached so as to be within the specified range; acquire, by means of the second antenna, a signal returning after the specified signal is reflected by the external object; transmit a cellular signal having been adjusted to have lower power than the specified power, when the phase difference between the specified signal and the reflected signal falls within a specified range; and refrain from adjusting the specified power, when the phase difference falls outside the specified range. Various other embodiments are also possible.