Near-field Noise Suppression Sheet Surface Resistance
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Solution Overview
Problem
Existing near-field noise suppression sheets for mobile information terminals and electronic appliances face challenges in effectively absorbing high-frequency electromagnetic waves due to insufficient absorbability, high production costs, and difficulty in achieving thinness without compromising performance.
Innovation Solution
A near-field noise suppression sheet comprising a pair of plastic films with thin metal films made of magnetic metals like Ni, Fe, or Co, adhered with a conductive adhesive to achieve a controlled surface resistance of 20-150 Ω/square, enhancing the absorption of near-field electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic materials and/or conductive materials are blended in the resin to suppress electromagnetic wave noises, then noise suppression capability is improved, but the sheet becomes thicker and production cost increases
Solution Approach 1:
The invention extracts the magnetic materials and conductive materials from the resin matrix, separating them into distinct thin metal film layers deposited on plastic film substrates. This extraction eliminates the need to blend materials in resin, enabling thinness while maintaining noise suppression capability through controlled surface resistance of the metal films.
Solution Approach 2:
The invention uses composite structures combining plastic films (for mechanical support) with thin metal films (for electromagnetic wave absorption). This composite approach allows optimization of each layer's function - the plastic provides structural integrity while the metal films provide noise suppression with controlled thickness and surface resistance.
2Object-affected harmful factors
If magnetic materials and/or conductive materials are blended in the resin to suppress electromagnetic wave noises, then noise suppression capability is improved, but production cost increases
Solution Approach 1:
By extracting materials from resin blends and using thin metal films deposited by vacuum deposition, the invention reduces material consumption and eliminates complex blending processes, thereby reducing production cost while maintaining effectiveness.
Solution Approach 2:
The invention changes the formulation approach from resin-based blends to thin metal films with controlled surface resistance (20-150 Ω/square). This parameter change enables precise control of noise suppression performance while using minimal material, reducing production cost.
3Object-affected harmful factors
If thin metal film is formed to achieve surface resistance of 20-150 Ω/square for noise suppression, then electromagnetic wave absorbability is improved, but surface resistance becomes uneven
Solution Approach 1:
The invention merges multiple thin metal films between plastic film layers to achieve the desired surface resistance. By combining several films, the total surface resistance becomes more uniform and controllable, overcoming the unevenness inherent in single thin film deposition.
Solution Approach 2:
The composite structure of alternating plastic and metal films allows the plastic layers to act as spacers and support, enabling more uniform metal film deposition. The multi-layer composite structure averages out local variations in surface resistance, improving overall uniformity.
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 provides stable and effective absorption of near-field noises across several hundreds of MHz to several GHz frequencies, reducing unevenness in surface resistance and electromagnetic wave absorbability, thus effectively suppressing noise in mobile devices and electronic appliances.
Implementation Method 1
each thin metal film being made of a magnetic metal, and having a controlled thickness such that a pair of the adhered thin metal films have surface resistance of 20-150 Ω/square
Implementation Method 2
provides stable and effective absorption of near-field noises across several hundreds of MHz to several GHz frequencies
Implementation Method 3
the plastic films being adhered by a conductive adhesive with the thin metal films inside
Data Source
AI summary
A near-field noise suppression sheet comprising a pair of plastic films each having a thin metal film on one surface, the plastic films being adhered by a conductive adhesive with the thin metal films inside, each thin metal film being made of a magnetic metal, and having a controlled thickness such that a pair of the adhered thin metal films have surface resistance of 20-150 Ω/square.