Electromagnetic Wave Absorbing Composite Sheet Frequency Tuning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic-wave-absorbing composite sheets do not have high absorbability to electromagnetic wave noises in a specific frequency range and cannot shift the frequency range where absorbability is maximized.
Innovation Solution
A composite sheet is created by laminating an electromagnetic-wave-shielding film on an electromagnetic-wave-absorbing film with a thin Ni or conductive polymer film, where the area ratio of the shielding film to the absorbing film is between 10-80%, allowing for enhanced absorbability and frequency shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thin metal film with linear scratches is used to achieve wide frequency absorbability, then electromagnetic wave absorbability across a broad frequency range is improved, but the ability to exhibit particularly large absorbability at a particular frequency and to shift the frequency range is lost
Solution Approach 1:
The invention divides the electromagnetic wave absorbing structure into two separate functional films: a first film with linear scratches for broad frequency absorption, and a second film with patterned conductive particles for targeted frequency enhancement. This segmentation allows each film to perform its specific function independently while working together to achieve both wideband absorption and frequency-tunable peak absorption.
Solution Approach 2:
The invention combines two different types of electromagnetic wave absorbing materials with distinct mechanisms: a metal film with linear scratches that provides broadband absorption through geometric scattering, and a patterned film with conductive particles that provides resonant absorption at specific frequencies. This composite structure integrates the advantages of both materials to achieve dual functionality.
2Object-affected harmful factors
If electromagnetic-wave-absorbing films are disposed in electric appliances to absorb electromagnetic wave noises, then electromagnetic wave noise absorption is improved, but the ability to target specific frequency ranges and shift maximization frequencies is limited
Solution Approach 1:
The invention applies different structural characteristics to different regions of the electromagnetic wave absorbing system. The first film has linear scratches with specific geometries optimized for broadband absorption, while the second film has patterned conductive particles with specific arrangements optimized for resonant absorption at target frequencies. This local differentiation enables simultaneous broadband and frequency-specific performance.
Solution Approach 2:
The invention enables dynamic adjustment of the electromagnetic wave absorption characteristics by modifying the area ratio between the two films. By changing the proportion of the patterned film with conductive particles relative to the linear scratch film, the peak absorption frequency and its intensity can be tuned to match different electromagnetic interference scenarios.
3Quantity of substance
If a composite electromagnetic wave absorber is created to achieve high absorbability in a wide frequency range, then overall electromagnetic wave noise absorption is improved, but the function of exhibiting particularly large absorbability at a particular frequency is lost
Solution Approach 1:
The invention merges two complementary electromagnetic wave absorption mechanisms into a single composite structure. The linear scratch pattern provides a broadband absorption baseline, while the overlaid patterned conductive particles create resonant peaks at specific frequencies. The combination produces a unified film that simultaneously achieves wideband absorption and enhanced peak absorption.
Solution Approach 2:
The invention controls the absorption characteristics by adjusting the area ratio parameter between the two films. By varying this ratio, the relative contribution of broadband absorption versus resonant absorption can be tuned, allowing optimization of peak absorption intensity at specific frequencies while maintaining overall broadband performance.
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 composite sheet achieves high electromagnetic wave noise absorbability in a desired frequency range, efficiently absorbing noise emissions from electronic devices by optimizing the area ratio of the shielding to absorbing films.
Implementation Method 1
a thin Ni or conductive polymer film having surface resistance in a range of 50-200 Ω/square, which is formed on a surface of a plastic film
Implementation Method 2
an electromagnetic-wave-shielding film laminated on the electromagnetic-wave-absorbing film
Implementation Method 3
an electromagnetic-wave-absorbing composite sheet comprising an electromagnetic-wave-absorbing film, and an electromagnetic-wave-shielding film laminated on the electromagnetic-wave-absorbing film
Data Source
AI summary
An electromagnetic-wave-absorbing composite sheet contains an electromagnetic-wave-absorbing film, and an electromagnetic-wave-shielding film laminated on the electromagnetic-wave-absorbing film, wherein the electromagnetic-wave-absorbing film is formed of a thin Ni or conductive polymer film having surface resistance in a range of 50-200 Ω/square, which is disposed on a surface of a plastic film, and an area ratio of the electromagnetic-wave-shielding film to the electromagnetic-wave-absorbing film is 10-80%.