Three-Layer Human Body Model for Wireless Signal Measurement
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Solution Overview
Problem
Current human body models used for wireless device validation are not accurate enough to represent the dielectric properties and thicknesses of human skin, fat, and muscle, particularly for wearable devices that interact with the body in near field applications, leading to inaccuracies in simulating electromagnetic propagation and antenna performance.
Innovation Solution
A three-layer material structure is proposed, where the first layer approximates the dielectric property of human skin, the second layer approximates human fat, and the third layer approximates human muscle, with varying thicknesses based on body location, and using materials with specific dielectric constants to better mimic the human body's electromagnetic behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple single-layer material structure is used for the human body model, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision and reliability of wireless signal measurements deteriorate due to inaccurate representation of human skin, fat, and muscle dielectric properties
Solution Approach 1:
The human body model is segmented into three distinct layers (first layer, second layer, third layer), each representing different human tissue types (skin, fat, muscle). Each layer is assigned specific dielectric constant values that match the electromagnetic properties of the corresponding human tissue, enabling accurate simulation of signal propagation through the human body while maintaining a manageable structured approach to model complexity
Solution Approach 2:
The human body model uses a composite structure combining three different materials with specific dielectric properties. The first material has a dielectric constant matching human skin, the second material matches human fat, and the third material matches human muscle. This composite approach allows the model to accurately represent the electromagnetic behavior of actual human tissue layers
2Measurement precision
If uniform thickness is used for all layers across the entire body model, then the manufacturing process is simplified and productivity is improved, but the measurement precision deteriorates because actual human body layers have location-dependent thickness variations
Solution Approach 1:
The human body model implements location-dependent thickness variations for each layer. The first layer has different thicknesses at different body locations, the second layer has different thicknesses at different body locations, and the third layer has different thicknesses at different body locations. This local quality approach accurately reflects the anatomical reality that skin, fat, and muscle layer thicknesses vary across different parts of the human body, thereby improving measurement precision for location-specific wireless device testing
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 structure provides a more accurate proxy for the human body, improving the simulation of near field propagation effects and antenna performance by reducing reflection and enhancing transmission, thus better validating wireless device designs for both far and near field applications.
Implementation Method 1
The dielectric constant of the second material is less than a dielectric constant of the first material and less than a dielectric constant of the third material. The dielectric constant of the first material approximates a dielectric property of human skin. The dielectric constant of the second material approximates a dielectric property of human fat. The dielectric constant of the third material approximates a dielectric property of human muscle.
Data Source
AI summary
Aspects of the present disclosure provide an improved material structure for a human body model. The human body model comprises (1) a first layer comprising a first material, (2) a second layer, comprising a second material, underneath the first layer, and (3) a third layer, comprising a third material, underneath the second layer. The dielectric constant of the second material is less than a dielectric constant of the first material and less than a dielectric constant of the third material. According to an aspect, the thickness of the first and/or second layer may represent the thickness of human skin and fat, respectively. The thickness of one or more layers may vary based on a location on the human body model.