Electromagnetic Wave Absorber Layers for Reflection and Short-Circuit Control
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Solution Overview
Problem
Conventional electromagnetic wave absorbers are ineffective in suppressing reflections of electromagnetic waves, which can cause interference with other electronic devices, and may lead to short-circuiting issues due to direct contact with conductive materials.
Innovation Solution
An electromagnetic wave absorber comprising a reflection suppression layer with a high binder content (85% or more) and an absorption layer with a binder content of 45-85% along with an electromagnetic wave absorbing material, designed to reduce wave reflections and improve absorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonant electromagnetic wave absorbing sheets that use conductive materials are used to suppress high-frequency noise, then absorption effectiveness is improved, but the risk of short-circuiting increases due to direct contact with circuit elements
Solution Approach 1:
A non-conductive adhesive layer is introduced as an intermediary between the conductive electromagnetic wave absorbing sheet and the circuit elements. This adhesive layer prevents direct contact and eliminates short-circuiting risk while maintaining the sheet's absorption effectiveness. The adhesive serves as a mediator that allows the conductive sheet to function without creating electrical hazards.
Solution Approach 2:
The patent uses a simple, non-conductive adhesive material that provides sufficient isolation functionality without requiring complex insulation structures. The adhesive layer, while thin and relatively simple, effectively prevents short-circuiting while allowing the conductive sheet to maintain its electromagnetic wave absorption properties.
2Object-affected harmful factors
If the conductive layer of the resonant electromagnetic wave absorbing sheet is protected by using an adhesive for affixing, then direct contact with circuit elements is avoided, but the conductive layer may still be exposed on cut surfaces
Solution Approach 1:
The non-conductive adhesive layer is applied in advance to the entire surface of the circuit elements before attaching the electromagnetic wave absorbing sheet. This preliminary coverage ensures that even when the sheet is cut and conductive edges are exposed, the adhesive already in place prevents contact with the circuit elements, maintaining continuous protection.
Solution Approach 2:
The adhesive layer acts as a pre-established protective barrier that cushions against potential short-circuiting risks. By having the adhesive in place before the sheet is attached or cut, the system is prepared in advance to handle exposure scenarios, ensuring continuous electrical isolation.
3Reliability
If electromagnetic wave absorbers are used to suppress noise, then noise suppression effect is achieved, but reflected electromagnetic waves may reach other electronic devices
Solution Approach 1:
The electromagnetic wave absorbing sheet has different properties at different locations: the bulk material provides absorption, while the surface layer is designed with specific characteristics to minimize reflection. This local differentiation allows the sheet to simultaneously achieve noise suppression through absorption and reduce harmful reflections to other devices.
Solution Approach 2:
The patent addresses the harmful reflection by using a surface layer composition that converts reflected waves into absorbed energy. The surface layer's specific material composition and structure cause incident waves to be absorbed rather than reflected, turning what would be a harmful reflection into a beneficial absorption effect that protects other electronic 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
The solution effectively suppresses electromagnetic wave reflections and absorption, preventing interference with other electronic devices and eliminating the risk of short-circuiting, while maintaining flexibility and durability.
Implementation Method 1
it has been discovered that epsilon-type iron oxide has the ability to absorb electromagnetic waves in the millimeter wave band
Implementation Method 2
the electromagnetic wave reflection suppression layer has a permittivity of 3.5 or less, preferably 3.0 or less
Data Source
AI summary
An electromagnetic wave absorber of the present application includes an electromagnetic wave reflection suppression layer and an electromagnetic wave absorption layer, the electromagnetic wave reflection suppression layer contains a first binder, a content ratio of the first binder in the electromagnetic wave reflection suppression layer is 85 mass % or more, the electromagnetic wave absorption layer contains a second binder and an electromagnetic wave absorbing material, and a content ratio of the electromagnetic wave absorbing material in the electromagnetic wave absorption layer is 45 to 85 mass %.