Layered EM Wave Blocking Structure for Outdoor Corrosion Resistance
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Solution Overview
Problem
Conventional Faraday cages made of metals are not suitable for outdoor use due to their low resistance against corrosion, and they fail to prevent electromagnetic wave interference that causes malfunctions in electronic devices and electronic toll collection systems.
Innovation Solution
A structure comprising a first portion made of a high electrical conductivity material, such as gold, silver, or copper, and a second portion made of a material with lower electrical conductivity but higher corrosion resistance, such as stainless steel or titanium, where the second portion covers at least part of the first portion's surface, enhancing corrosion resistance and electromagnetic wave blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal is used as an electric conductor for Faraday cage, then electromagnetic wave blocking capability is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining a metal layer (first material) with a protective coating layer (second material). The metal layer provides electromagnetic wave blocking capability while the protective coating layer provides corrosion resistance. This composite structure resolves the contradiction by integrating the advantages of both materials - the metal's conductivity for EMF blocking and the coating's resistance to environmental degradation.
2Object-affected harmful factors
If a thick metal layer is used to improve corrosion resistance, then corrosion protection is improved, but electromagnetic wave blocking effectiveness deteriorates
Solution Approach 1:
The patent uses a composite material structure where a thin metal layer (providing EMF blocking) is combined with a protective coating layer (providing corrosion resistance). This resolves the contradiction by assigning different functions to different layers - the metal layer's thickness is optimized for electromagnetic shielding while the coating layer provides the necessary corrosion protection without interfering with EMF blocking effectiveness.
Solution Approach 2:
The patent applies local quality by giving different materials different functions within the same structure. The metal layer is specifically designed for electromagnetic wave blocking while the protective coating is designed for corrosion resistance. Each material is placed where it provides its specific function, resolving the contradiction between thickness requirements for different properties.
3Object-affected harmful factors
If a protective coating is added to metal Faraday cage, then corrosion resistance is improved, but device complexity increases
Solution Approach 1:
The patent applies composite materials by combining a metal layer with a protective coating layer in a simplified two-layer structure. This resolves the contradiction by providing corrosion protection through a straightforward coating process rather than complex alloy formulations or multi-layer systems, maintaining structural simplicity while achieving the desired corrosion resistance.
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 proposed structure provides improved resistance against outdoor corrosion and effectively blocks electromagnetic waves, preventing interference that can cause malfunctions in electronic devices and electronic toll collection systems.
Implementation Method 1
Faraday case indicates a case or a cage made of an electric conductor, or a space surrounded with such a case or a cage. Since electric line of force cannot penetrate an internal space surrounded with an electric conductor, an external electric field is shut out of the internal space. Specifically, since electric charges are rearranged in the internal space so as to cancel an external electric field, the electric field becomes zero.
Implementation Method 2
a second portion (120) comprised of a second material having an electrical conductivity smaller than the same of the first material and a corrosion-resistance higher than the same of the first material, the second portion (120) covering therewith at least a part of a surface of the first portion (110)
Data Source
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AI summary
A structure blocking electromagnetic waves (100) includes a first portion (110) comprised of a first material consisting of an electric conductor, and a second portion (120) comprised of a second material having an electrical conductivity smaller than the same of the first material and a corrosion-resistance higher than the same of the first material, the second portion (120) covering therewith at least a part of a surface of the first portion (110).