Antenna Transmission Output Restriction via Reflected Power Detection
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Solution Overview
Problem
Existing portable terminal designs face challenges in restricting transmission output when an antenna is in contact with a human body, as separate touch sensors required for detection can degrade antenna performance and limit coverage.
Innovation Solution
A method and apparatus that utilize a radio frequency (RF) unit to detect transmission power mismatch when emitted via the antenna, measuring reflected power, and a controller to restrict transmission output when the power exceeds a predetermined value, thereby detecting contact with a human body without a separate touch sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate touch sensor is included adjacent to the antenna to detect human body contact, then the transmission output can be restricted to minimize adverse health effects, but the antenna performance is deteriorated and the coverage range is limited
Solution Approach 1:
The patent combines the touch detection function with the existing antenna by detecting changes in the antenna's electrical characteristics (impedance, resonant frequency) when a human body contacts it. This eliminates the need for a separate touch sensor and its dedicated antenna, thereby avoiding performance deterioration and coverage limitations while still enabling transmission output restriction to minimize adverse health effects.
2Object-affected harmful factors
If a separate touch sensor is included adjacent to the antenna to detect human body contact, then the transmission output can be restricted to minimize adverse health effects, but the device complexity increases due to additional components and circuits
Solution Approach 1:
The patent makes the existing antenna serve dual functions: its primary function for wireless communication and an additional function for touch detection. By monitoring changes in the antenna's electrical characteristics, the system can detect human body contact without requiring separate touch sensor circuits, thereby reducing overall device complexity while still enabling transmission output restriction to protect user health.
3Ease of operation
If the touch sensor-dedicated antenna is contained to be close to a main antenna, then the touch detection function can be implemented, but the antenna performance is deteriorated
Solution Approach 1:
The patent eliminates the need for a separate touch sensor antenna by integrating touch detection functionality into the main antenna itself. By detecting changes in the main antenna's electrical characteristics when a human body contacts it, the system achieves touch detection capability without placing any additional antenna close to the main antenna, thereby avoiding performance deterioration.
4Reliability
If the touch sensor-dedicated antenna is contained to be distant from a main antenna, then the antenna performance is maintained, but the scope and range where a touch sensor function covers may be limited
Solution Approach 1:
The patent makes the main antenna serve dual purposes: wireless communication and touch detection. Since the antenna's electrical characteristics change when a human body contacts it, the system can detect touches across the entire antenna surface and coverage area, providing comprehensive touch detection range without needing a separate dedicated antenna that would be constrained by placement distance requirements.
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
Effectively restricts transmission output to minimize adverse health effects by detecting antenna contact through self-detection, maintaining performance and coverage while avoiding the limitations of separate touch sensors.
Implementation Method 1
a radio frequency (RF) unit to detect a transmission power reflected based on a degree of mismatching of an antenna when a transmission power is emitted via the antenna
Data Source
AI summary
A transmission output restricting method and apparatus of a portable terminal includes a radio frequency (RF) unit to detect a transmission power reflected based on a degree of mismatching of an antenna when a transmission power is emitted via the antenna, and to measure a transmission power increased due to the reflected transmission power caused by a human contact to the antenna, and a controller to control an output of the transmission power by restricting the output of the transmission power when the transmission power measured by the RF unit is greater than or equal to a predetermined value.