Electromagnetic Wave Absorption Film with Multi-Pattern Segmentation
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Solution Overview
Problem
Existing electromagnetic wave absorbers are susceptible to changes in the permittivity of surrounding materials and temperature, leading to deviations in absorption frequency and reduced effectiveness.
Innovation Solution
An electromagnetic wave absorption film with multiple patterns (first, second, and third electromagnetic wave absorption patterns) on a planar base, where each pattern has a specific frequency range and arrangement, ensuring that the absorption band is extended to both higher and lower frequencies, reducing susceptibility to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frequency-selective shielding layer is used to absorb electromagnetic waves at a predetermined frequency, then the absorption efficiency at that specific frequency is improved, but the system becomes susceptible to environmental factors such as permittivity changes and temperature, causing frequency deviation and reduced reliability
Solution Approach 1:
The electromagnetic wave absorption system is segmented into multiple frequency-selective shielding layers, each designed to absorb electromagnetic waves at different predetermined frequencies. This segmentation allows the system to maintain stable absorption at each specific frequency while collectively covering a broader frequency range, thereby resolving the contradiction between frequency stability and frequency range coverage.
Solution Approach 2:
The invention uses composite structures with multiple frequency-selective shielding layers having different electromagnetic wave absorption characteristics. By combining layers with different resonance frequencies and absorption properties, the system achieves both frequency stability for each layer and extended frequency range coverage for the composite structure as a whole.
2Adaptability or versatility
If multiple frequency-selective shielding layers are used to cover different frequencies, then the frequency range coverage is improved, but the device complexity increases
Solution Approach 1:
Multiple frequency-selective shielding layers are merged into a single integrated electromagnetic wave absorption device. Each layer is designed with specific FSS patterns and material properties to target different frequency ranges, allowing the combined structure to cover a broad frequency spectrum while maintaining a unified device architecture rather than requiring separate independent systems.
3Reliability
If the absorption frequency is optimized for a specific predetermined frequency, then the absorption efficiency at that frequency is improved, but the system becomes susceptible to wavelength reduction phenomenon and frequency deviation caused by surrounding materials
Solution Approach 1:
The absorption function is segmented across multiple frequency-selective shielding layers, each optimized for different frequency ranges. This segmentation reduces the susceptibility of any single layer to environmental effects, as the overall system maintains absorption efficiency across multiple frequency bands even if individual layers experience some frequency deviation due to surrounding materials.
Solution Approach 2:
The invention adjusts and optimizes multiple parameters including the thickness, material composition, and FSS pattern geometry of each frequency-selective shielding layer. By carefully controlling these parameters, the system achieves broad frequency range coverage while minimizing the impact of environmental factors on absorption efficiency at any given frequency.
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 film effectively absorbs electromagnetic waves across a broader frequency range, maintaining absorption efficiency despite changes in the surrounding environment, ensuring consistent performance.
Implementation Method 1
a first electromagnetic wave absorption pattern formed on the base; a second electromagnetic wave absorption pattern formed on the base; and a third electromagnetic wave absorption pattern formed on the base
Implementation Method 2
A [GHz] is defined as a frequency at which an absorption amount of an electromagnetic wave absorbed by the first electromagnetic wave absorption pattern has its local maximum value
Data Source
AI summary
An aspect of the present invention provides an electromagnetic wave absorption film that is less susceptible to the surrounding environment.An electromagnetic wave absorption film 10 has: a planar base 20; a first electromagnetic wave absorption pattern 1 formed on the base 20; a second electromagnetic wave absorption pattern 2 formed on the base 20; and a third electromagnetic wave absorption pattern 3 formed on the base 20, wherein when A [GHz] is defined as a frequency at which an absorption amount of an electromagnetic wave absorbed by the first electromagnetic wave absorption pattern 1 exhibits its local maximum value in a range from 20 to 110 GHz, B [GHz] satisfies Expression (1), B [GHz] being the value of a frequency at which an absorption amount of an electromagnetic wave absorbed by the second electromagnetic wave absorption pattern 2 exhibits its local maximum value, and C [GHz] satisfies Expression (2), C [GHz] being the value of a frequency at which an absorption amount of an electromagnetic wave absorbed by the third electromagnetic wave absorption pattern 3 exhibits its local maximum value,1.037×A≤B≤1.30×A Expression (1)0.60×A≤C≤0.963×A Expression (2).