RF Antenna With Millimeter Wave Sensor For Human Tissue Detection
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Solution Overview
Problem
Conventional proximity sensing antennas in electronic devices cannot distinguish between human tissue and other high dielectric objects, leading to unnecessary dynamic power reduction and network issues when the device is placed on inanimate surfaces.
Innovation Solution
Incorporating a millimeter wave (mmW) antenna and a processor that combines capacitance variation signals from an RF antenna with distance-to-object signals to accurately differentiate between proximity to human tissue and inanimate objects, allowing for precise reduction of RF power output only when in proximity to human tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional p-sensor antennas are used to detect high dielectric objects, then RF power reduction is activated to comply with regulatory requirements, but the device cannot distinguish between human tissue and inanimate objects leading to unnecessary power reduction and network issues
Solution Approach 1:
The patent divides the object detection function into two separate sensing systems: a conventional p-sensor antenna for detecting high dielectric objects and a millimeter wave antenna for detecting human tissue-specific characteristics. Each sensor segment handles a specific aspect of detection, allowing the system to distinguish between inanimate objects and human tissue by comparing signals from both segments rather than relying on a single sensor
Solution Approach 2:
The millimeter wave antenna acts as an intermediary sensor that provides additional information about the detected object. By introducing this intermediate detection layer that specifically responds to human tissue properties (such as water content and thermal characteristics), the system can mediate between the generic high dielectric detection and the need for accurate human tissue identification, preventing false positives from inanimate objects
2Object-affected harmful factors
If RF power is reduced dynamically when any high dielectric object is detected, then regulatory compliance is achieved, but network throughput decreases and disconnections occur due to unnecessary power reduction
Solution Approach 1:
The patent implements dynamic power adjustment based on real-time analysis of signals from both the p-sensor antenna and millimeter wave antenna. The system continuously monitors the combination of capacitance variation signals and millimeter wave signals, adjusting RF power dynamically only when both sensors confirm the presence of human tissue. This dynamic approach prevents unnecessary power reduction that would occur with static threshold-based detection of any high dielectric object
Solution Approach 2:
The system uses feedback from two sensing channels to control RF power output. The processor analyzes the combination of signals from the p-sensor antenna and millimeter wave antenna, and only triggers power reduction when the feedback from both sensors indicates human tissue presence. This dual-feedback mechanism provides more accurate control than single-sensor feedback, preventing false power reduction that would harm network productivity while still ensuring RF safety when appropriate
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 solution enables the electronic device to accurately reduce RF power output only when in proximity to human tissue, preventing unnecessary network disconnections and maintaining high throughput even on inanimate surfaces.
Implementation Method 1
a) coupled to the RF antenna to receive capacitance variation signals from the RF antenna
Implementation Method 2
b) coupled to the mmW antenna to receive distance to the object signals from the mmW antenna
Data Source
AI summary
An electronic communications device includes a radio frequency (RF) transceiver, an RF antenna, a millimeter wave (mmW) antenna and a processor. The RF antenna has dielectric-object proximity-sensing capability. The processor is a) coupled to the RF antenna to receive capacitance variation signals from the RF antenna; b) coupled to the mmW antenna to receive distance to the object signals from the mmW antenna; and c) coupled to the RF transceiver to produce power reduction signals to the RF transceiver.