Thermal Screen Dosimetry for High-Frequency 5G EM Exposure
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Solution Overview
Problem
Existing electromagnetic dosimetry devices are inadequate for measuring the exposure of 5G and beyond wireless devices due to high EM losses, low signal-to-noise ratio (SNR), and inability to account for dynamic resource allocation, leading to inaccurate and costly compliance testing.
Innovation Solution
A device that converts electromagnetic energy into heat using a thermal screen with thermal sensors to measure electromagnetic dosimetric quantities, incorporating a processing unit to calculate these quantities from heat distribution and EM field information, and employs a lock-in technique to improve SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If liquid phantoms are used for electromagnetic dosimetry, then the device can measure EM exposure in frequency ranges from 30 MHz to 6 GHz, but the liquid needs to be changed frequently due to evaporation and degradation of dielectric properties
Solution Approach 1:
The patent changes the physical state parameter of the phantom material from liquid to solid form. The solid phantom maintains stable dielectric properties over time without evaporation or degradation, eliminating the need for frequent replacement while maintaining measurement reliability across frequency ranges.
Solution Approach 2:
The patent uses composite materials combining solid dielectric material with conductive particles (graphite, carbon, or metal) to create a phantom that exhibits both mechanical stability and appropriate electromagnetic properties for dosimetry measurements.
2Reliability
If solid phantoms are used for electromagnetic dosimetry, then the device has reliability and constancy of dielectric properties over time, but the device is quite complex and costly to manufacture
Solution Approach 1:
The patent applies conductive particles locally within the solid dielectric matrix at optimized concentrations to achieve the required electromagnetic properties. This localized addition of functional particles simplifies manufacturing compared to creating entirely complex solid structures, while maintaining reliability.
3Duration of action of stationary object
If solid phantoms are used for electromagnetic dosimetry, then the device has reliability over time, but the device suffers from high EM losses that do not allow measurement above 10 GHz
Solution Approach 1:
The patent optimizes the concentration and distribution parameters of conductive particles within the solid dielectric to minimize EM losses at high frequencies. By carefully controlling these parameters, the phantom maintains low loss characteristics enabling measurements above 10 GHz while preserving operational stability.
4Measurement precision
If conventional dosimetry devices are used for 5G devices, then the device can measure EM exposure, but the device cannot account for dynamic resource allocation leading to inaccurate compliance testing
Solution Approach 1:
The patent incorporates a control unit that dynamically adjusts measurement parameters and resource allocation based on the operational state of 5G devices. This dynamic adaptation enables accurate compliance testing by accounting for varying transmission powers, frequency allocations, and resource distribution in real-time.
Solution Approach 2:
The patent implements feedback mechanisms where the control unit continuously monitors EM field measurements and resource allocation states, then adjusts measurement strategies accordingly. This closed-loop approach ensures accurate dosimetry measurements that reflect actual dynamic operating conditions of 5G devices.
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
Provides accurate, reliable, and cost-effective electromagnetic dosimetry for 5G devices by converting EM losses into measurable heat, enhancing SNR and accounting for dynamic resource allocation.
Implementation Method 1
said screen being adapted to absorb at least a portion of the EM field emitted by the electromagnetic source
Implementation Method 2
a screen comprising a top surface faced to the electromagnetic source and a bottom surface opposite to the top surface, said screen being adapted to absorb at least a portion of the EM field emitted by the electromagnetic source; the screen comprising a plurality unit cells; at least one thermal sensor arranged relative to the bottom surface of the screen and configured to measure a physical quantity relative to the heat distribution along a surface of the screen induced due to the absorption of the electromagnetic field in the screen medium
Data Source
AI summary
A device and method is provided for measuring an electromagnetic dosimetric quantity received by an object illuminated by an electromagnetic field emitted by an electromagnetic source. The device including: a screen having a plurality unit cells and a top surface faced to the electromagnetic source and a bottom surface, the screen being adapted to absorb at least a portion of the electromagnetic field emitted by the electromagnetic source; a thermal sensor arranged relative to the bottom surface to measure a physical quantity relative to the heat distribution along a surface of the screen induced due to the absorption of the electromagnetic field in the screen medium; and a processing unit linked to the thermal sensor and configured to calculate the electromagnetic dosimetric quantities from the measured heat distribution, the information relative to the electromagnetic field emitted by the electromagnetic source, and the predetermined electromagnetic and thermal properties of the screen.