Field-Enhancing Dosimetry Sensor for High-Frequency EM Assessment
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Solution Overview
Problem
Existing electromagnetic dosimetry devices face challenges in accurately measuring electromagnetic fields at frequencies above 6 GHz due to high EM losses, leading to reduced signal-to-noise ratio (SNR) and complex, costly manufacturing, especially for 5G and beyond wireless devices, which require new dosimetry standards based on surface area power density.
Innovation Solution
A device is proposed that includes a dielectric layer and an electromagnetic field enhancing element to enhance the intensity of electromagnetic fields transmitted through a lossy medium, converting electromagnetic losses into measurable heat, and uses sensors to measure these fields accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional dosimetry devices are used to measure electromagnetic fields at frequencies above 6 GHz, then measurement capability is provided, but measurement precision deteriorates due to high EM losses and limited signal-to-noise ratio
Solution Approach 1:
The patent converts the harmful electromagnetic losses in the phantom material into a beneficial effect by using a sensor to detect the absorbed energy as heat or voltage. The lossy dielectric material that previously degraded signal quality is now utilized to generate measurable signals through its loss mechanism, thereby improving measurement precision at high frequencies above 6 GHz.
2Reliability
If solid phantoms are used to reproduce electromagnetic properties of biological tissues, then reliability of dielectric properties is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the material parameters by using a lossy dielectric material with specific permittivity and loss tangent values that match biological tissue characteristics. By carefully selecting and adjusting these material parameters, the phantom achieves reliable dielectric property representation while simplifying the overall device structure and manufacturing process.
3Ease of manufacture
If liquid phantoms are used to simulate biological tissues, then ease of manufacture is improved, but duration of action deteriorates due to evaporation and degradation of dielectric properties
Solution Approach 1:
The patent employs a composite material structure combining a semi-solid base material with conductive particles or additives. This composite formulation provides the ease of manufacture characteristic of liquid phantoms while the semi-solid matrix prevents evaporation and extends the operational lifetime, resolving the contradiction between ease of fabrication and duration of action.
4Measurement precision
If electromagnetic field intensity is increased to compensate for losses in lossy media, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent introduces a sensor as an intermediary element between the electromagnetic source and the lossy phantom material. The sensor detects the electromagnetic field characteristics directly in the phantom without requiring excessive energy input, thereby maintaining measurement precision while minimizing energy consumption through efficient field coupling and signal detection.
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
The device maintains accurate measurements with improved SNR by enhancing electromagnetic field intensity and converting losses into measurable heat, facilitating easier and less expensive manufacturing for precise electromagnetic dosimetry.
Implementation Method 1
at least one electromagnetic field enhancing element arranged relative to the at least one dielectric layer and configured in a manner to enhance the intensity of the electromagnetic field transmitted through the at least one dielectric layer
Implementation Method 2
measuring the electromagnetic dosimetry quantities induced in the lossy medium by electromagnetic fields emitted by an electromagnetic source
Implementation Method 3
the absorption of radiation is essentially limited to the superficial layers of the body
Data Source
AI summary
A device for measuring a physical quantity related to an electromagnetic field emitted by an electromagnetic source. The device is configured to simulate the electromagnetic characteristics of a reference object made of a lossy medium, e.g. a biological tissue. The device includes: a dielectric layer including an upper surface faced to the electromagnetic source and a bottom surface, the dielectric layer being at least partly transparent to the electromagnetic field emitted by the electromagnetic source; an electromagnetic field enhancing element arranged relative to the dielectric layer and configured in a manner to enhance the intensity of the electromagnetic field transmitted through the dielectric layer in a pre-determined zone; and a sensor arranged beneath the electromagnetic field enhancing element and configured to measure the physical quantity related to the electromagnetic field transmitted through the dielectric layer and the electromagnetic field enhancing element.