Human Tissue Phantom IPD Estimation from SAR Measurements
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Solution Overview
Problem
The challenge lies in the inefficiency and complexity of measuring Incident Power Density (IPD) in wireless communication devices, particularly above 6 GHz, which requires additional time and resources compared to Specific Absorption Rate (SAR) measurements, leading to increased testing time and expense due to technical complexities and higher measurement uncertainty.
Innovation Solution
A method and device to determine IPD from SAR measurements by calculating body equivalent plane wave power density using electric field distributions within a human tissue phantom, eliminating the need for direct IPD measurements, thereby reducing complexity and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct IPD measurements are performed above 6 GHz, then regulatory compliance is achieved, but testing time increases significantly (25 times longer than SAR measurement)
Solution Approach 1:
The patent performs SAR measurements first as a preliminary step, which provides the necessary data to calculate IPD values. This preliminary SAR measurement approach eliminates the need for separate, time-consuming direct IPD measurements while ensuring regulatory compliance through accurate IPD calculation from the SAR data.
Solution Approach 2:
The patent uses SAR measurements as an intermediary to obtain IPD values. Instead of measuring IPD directly, the system measures SAR and uses it as a mediator to calculate the equivalent IPD values, thereby reducing measurement time while maintaining accuracy and regulatory compliance.
2Measurement precision
If direct IPD measurements are performed, then incident power density values are obtained, but measurement uncertainty increases (85% uncertainty compared to 27% for SAR)
Solution Approach 1:
The patent uses SAR measurements as a more reliable intermediary to obtain IPD values. Since SAR measurements have lower uncertainty (27% vs 85%), using them as a basis for calculating IPD provides more accurate and reliable results than direct IPD measurement, while still meeting regulatory requirements.
3Reliability
If both SAR and IPD measurements are performed for devices above 6 GHz, then complete regulatory compliance is achieved, but testing expense and complexity increase
Solution Approach 1:
The patent makes the SAR measurement serve multiple functions: it is used both for SAR compliance assessment and as the basis for calculating IPD values. This multi-functionality eliminates the need for separate IPD measurement procedures, reducing testing complexity and expense while maintaining complete regulatory compliance for both SAR and IPD requirements.
Solution Approach 2:
The patent merges the SAR and IPD measurement processes by using the same SAR measurement data to determine both SAR compliance and calculate equivalent IPD values. This combining of purposes reduces the overall testing complexity and eliminates redundant measurement procedures.
4Measurement precision
If IPD measurements are performed, then incident power density is measured, but technical complexity increases due to magnetic field reconstruction requirements
Solution Approach 1:
The patent uses SAR measurements as an intermediary that avoids the complex magnetic field reconstruction process entirely. By calculating equivalent IPD values from SAR data, the system obtains IPD measurement capability without the technical complexity of direct IPD measurement procedures involving magnetic field reconstruction.
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 approach simplifies the IPD measurement process, reduces testing time, and maintains compliance with regulatory limits by using SAR measurements to derive IPD, thus enhancing efficiency and reducing measurement uncertainty.
Implementation Method 1
generate, using one or more radiofrequency probes within the human tissue phantom, measurements of the radiofrequency emissions absorbed within the human tissue phantom
Implementation Method 2
determine an incident power density at an outer surface of the human tissue phantom based on the generated measurements of the radiofrequency emissions
Data Source
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AI summary
An incident power density determination device includes a human tissue phantom, configured to approximate dielectric properties of human tissue; one or more radiofrequency probes, positioned within the human tissue phantom, configured to generate measurements of radiofrequency emissions absorbed within the human tissue phantom; and a processor, configured to determine an incident power density at an outer surface of the human tissue phantom based on the generated measurements of the radiofrequency emissions.