Layered EMF Shield Structure for Lower SAR Exposure
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Solution Overview
Problem
Conventional EMF shields either reflect or absorb EMF signals, with reflective shields redirecting signals back to users or others and absorption shields potentially causing health issues due to retained energy and increased temperature.
Innovation Solution
An EMF shield comprising a scattering layer with a metal coating and a reflective layer, where the EMF signal is initially dispersed and then reflected, reducing energy density and avoiding signal redirection or absorption near the user's head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a reflective shield is used to block EMF signals, then the EMF signal is reflected away from the user, but the signal is redirected back to the user or to others nearby
Solution Approach 1:
The shield is divided into multiple functional layers: a scattering layer with metal coating that breaks up EMF signals into dispersed patterns, and a reflective layer with dielectric material that reflects the already-scattered signals. This segmentation ensures that reflected signals maintain their dispersed state and do not concentrate back toward the user.
Solution Approach 2:
The scattering layer transforms the EMF signal from a concentrated directional wave into a multi-directional dispersed pattern by introducing spatial complexity. This dimensional transformation of the signal propagation pattern ensures that subsequent reflection does not redirect energy back to the source location.
2Object-affected harmful factors
If an absorption shield is used to block EMF signals, then the EMF signal is absorbed and trapped near the user's head, but the absorbed energy increases temperature and causes skin irritation
Solution Approach 1:
The invention extracts the absorption function from the shield design entirely. By using only scattering and reflection mechanisms, the shield blocks EMF signals without converting electromagnetic energy into thermal energy, thereby avoiding temperature increase and associated skin irritation.
3Object-affected harmful factors
If an absorption shield is used to block EMF signals, then the EMF signal is absorbed, but the shield contains the EMF signal in close proximity to the user's head for an extended period
Solution Approach 1:
The invention converts the potentially harmful trapped energy scenario into a beneficial rapid-dismissal scenario. By using reflection instead of absorption, the shield causes EMF signals to bounce away quickly rather than being trapped, transforming the interaction from energy retention to energy dismissal.
4Object-affected harmful factors
If a conventional reflective shield is used, then the EMF signal is reflected away, but the shield provides little to no SAR reduction to the user
Solution Approach 1:
The shield combines a scattering layer with metal coating and a reflective layer with dielectric material into a composite structure. This composite design leverages the signal-dispersing properties of the scattering layer and the signal-reflecting properties of the reflective layer to achieve effective SAR reduction that conventional single-function shields cannot provide.
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 EMF shield effectively breaks up harmful signals, preventing them from being sent back to users or retained near the body, reducing health risks associated with prolonged exposure to EMF emissions from devices like VR headsets and wireless earbuds.
Implementation Method 1
The metal coating initially causes the EMF signal to disperse and scatter. The scattered EMF signal has a lower energy density and therefore becomes less harmful as compared to the initial, more concentrated signal.
Implementation Method 2
After the EMF signal is initially scattered by the metal coating, the reflective layer causes the EMF signal to reflect.
Data Source
AI summary
An EMF shield is disclosed. The EMF shield includes a scattering layer and a reflective layer having an exterior surface and an interior surface opposite the exterior surface. The scattering layer includes a metal coating disposed at the exterior surface. The reflective layer includes a first side and a second side opposite the first side, the first side of the reflective layer being coupled to the interior surface of the scattering layer, wherein the reflective layer comprises a dielectric material. The metal coating includes an adhesive coating for coupling to an electronic device. The EMF shield is configured to scatter and reflect the EMF signal. After the EMF signal is initially scattered by the metal coating, the reflective layer causes the EMF signal to reflect.