NFC Antenna Hand Proximity Detection for RF Power Control
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Solution Overview
Problem
Existing electronic devices face challenges in accurately detecting a hand in proximity, which affects the adjustment of RF signal power output and sensitivity, leading to issues like dropped calls and reduced data throughput.
Innovation Solution
The use of a near-field communications (NFC) antenna to monitor induced voltage and determine hand proximity, combined with infrared and orientation sensors to adjust power output and sensitivity of the mobile antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF signal power output is increased to ensure connectivity, then communication reliability is improved, but energy consumption increases and interference worsens
Solution Approach 1:
The patent implements dynamic adjustment of RF signal power output based on real-time hand proximity detection. The system transitions from static power levels to dynamic power control, adjusting transmission power according to the detected hand state to optimize the balance between communication reliability and energy consumption.
Solution Approach 2:
The system uses hand proximity detection as feedback to continuously adjust RF signal power output. The detection mechanism provides real-time information about hand presence, which feeds back to the power control system to optimize transmission parameters, creating a closed-loop control system that adapts to changing conditions.
2Measurement precision
If hand proximity detection accuracy is improved, then RF signal power adjustment precision is improved, but device complexity increases
Solution Approach 1:
The patent repurposes the NFC antenna, originally designed solely for Near Field Communication functions, to also serve as a hand proximity detection sensor. By making the antenna multi-functional, the system achieves accurate hand detection without adding dedicated sensing hardware, thus avoiding increased device complexity.
Solution Approach 2:
The NFC antenna monitors its own induced voltage changes to detect hand proximity. The system uses the antenna's inherent electrical characteristics and their natural changes when a hand approaches, eliminating the need for separate detection circuits or additional sensing components.
3Use of energy by moving object
If RF signal power output is decreased to save energy, then energy consumption is reduced, but communication reliability deteriorates
Solution Approach 1:
The system dynamically adjusts power output based on actual communication needs determined by hand proximity. When no hand is detected (indicating the device is not being held), power is reduced to save energy. When a hand is detected (indicating active use), power is increased to ensure reliable communication, creating an adaptive power management strategy.
Solution Approach 2:
The system performs preliminary hand proximity detection before adjusting power output levels. By detecting the hand state in advance, the system can proactively adjust power settings to match upcoming communication requirements, preventing both energy waste and reliability issues.
4Measurement precision
If multiple sensors are added to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the NFC antenna multi-functional by using it for both its original communication purpose and as a hand proximity sensor. This approach achieves enhanced detection capability without adding separate sensing components, maintaining device simplicity while improving functionality.
Solution Approach 2:
The NFC antenna serves as an intermediary element that translates physical hand proximity into measurable electrical voltage changes. By using the antenna's inherent electromagnetic properties as the detection mechanism, the system avoids the need for additional sensors or complex detection hardware.
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
This method effectively detects hand proximity, allowing for precise adjustment of RF signal power and sensitivity, enhancing communication reliability and performance.
Implementation Method 1
monitoring an induced voltage at the NFC antenna
Data Source
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AI summary
Methods and devices for detecting a hand in proximity to an electronic device are described. The electronic device includes a near field communications (NFC) antenna. In one aspect, the method includes: monitoring an induced voltage at the NFC antenna; and determining whether a hand is in proximity to the electronic device based on the induced voltage.