Self-Adaptive Thin-Film RF Shielding for Optical Transparency
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Solution Overview
Problem
Existing electromagnetic shielding screens for vehicles with optical sensors have predefined and constant shielding effectiveness, failing to adapt dynamically to varying electromagnetic field strengths, requiring external power for activation, and compromising optical transparency.
Innovation Solution
A self-adaptive electromagnetic shielding device with a switchable RF shielding mesh surrounded by insulator-metal transition material, activated by a susceptor element that converts electromagnetic energy into heat to switch the material's conductivity state, automatically adjusting shielding based on incident energy levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a predefined and constant shielding effectiveness is used, then the shielding screen provides stable electromagnetic protection, but it cannot adapt dynamically to varying electromagnetic field strengths
Solution Approach 1:
The shielding screen transitions from a static, predefined configuration to a dynamic system that automatically adjusts its shielding effectiveness. The insulator-metal transition material changes its electrical conductivity in response to electromagnetic field strength, enabling the mesh to adapt its shielding properties without mechanical movement or external control.
Solution Approach 2:
The invention changes the electrical conductivity parameter of the insulator-metal transition material based on electromagnetic field intensity. When the electromagnetic field exceeds a threshold, the material transitions from insulating to conductive state, thereby changing the contact impedance and adjusting the shielding effectiveness dynamically.
2Extent of automation
If switchable RF shielding with localized components or insulator-metal transition materials is used, then the shielding effectiveness can be modulated, but external power supply or command is required for activation
Solution Approach 1:
The shielding system becomes self-activating by utilizing the incident electromagnetic energy itself as the trigger mechanism. The insulator-metal transition material automatically changes state in response to the electromagnetic field strength, eliminating the need for external power supplies, commands, or control systems.
Solution Approach 2:
The incident electromagnetic energy, which represents a harmful attack or interference, is converted into the activation mechanism for the shielding system. The electromagnetic field that threatens the sensor also provides the energy needed to trigger the protective response, turning the threat into the solution.
3Object-affected harmful factors
If a metal mesh with micrometric pitch is used for shielding, then electromagnetic protection is effective, but optical transparency is reduced
Solution Approach 1:
The invention uses a composite structure combining a metal mesh with insulator-metal transition material. This composite allows the system to achieve both electromagnetic shielding effectiveness and optical transparency by leveraging the different properties of the constituent materials in their respective operational states.
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 provides automatic transition between transparent and shielding states, maintaining high optical transparency and effective electromagnetic protection across a wide frequency range without external power, enhancing operational efficiency and adaptability.
Implementation Method 1
comprising a susceptor element, arranged opposite or in contact with said insulator-metal transition material and adapted to transform incident electromagnetic energy into a quantity of activation heat of said insulator-metal transition material
Implementation Method 2
a susceptor element, arranged opposite or in contact with said insulator-metal transition material and adapted to transform incident electromagnetic energy into a quantity of activation heat
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3~4A
AI summary
The invention relates to a self-adaptive shielding device for a lens or a window (1) of a piece of equipment provided with an electrically conductive enclosure (10) enclosing an optical or RF sensor (20) behind said lens or said window, said device comprising, on at least one face of said lens or said window, a shielding screen comprising a switchable RF shielding mesh (2) with a micrometric pitch at least partially surrounded by an edge of metal-insulator transition material (3) arranged between said mesh and an electrically conductive envelope (11) for shielding said equipment, comprising a susceptor element (5) arranged opposite or in contact with said metal-insulator transition material and suitable for transforming incident electromagnetic energy (RFH) into an amount of heat for activating said metal-insulator transition material (3, 3a, 31), said susceptor element being dimensioned to cause a transition to the conductive state of said metal-insulator transition material (3, 3a, 31, 31a) by means of said electromagnetic energy so as to electrically connect said mesh to said electrically conductive envelope when the incident electromagnetic energy exceeds a given threshold.