Multi-Layer Wave Absorber With Dielectric Interlayer for Wider Bandwidth
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Solution Overview
Problem
Existing wave absorbing materials, particularly those based on ferrite and rare earth-transition intermetallic compounds, struggle with limited effective absorption bandwidths, often less than 6 GHz, and adding interlayers to broaden this bandwidth results in increased mass and lack of universality.
Innovation Solution
A multi-layer wave absorber structure with an electromagnetic loss-free dielectric layer, such as vacuum, air, or paraffin, is introduced between composite absorbing material layers to enhance impedance matching and improve bandwidth without significantly increasing mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex multi-layer structures with carbon-based materials and metal meshes are introduced to broaden the working frequency band, then the effective absorption bandwidth is improved, but the overall mass of the wave absorber increases significantly
Solution Approach 1:
The patent changes the key parameter of the intermediate layer from lossy materials (carbon-based materials, metal meshes) to loss-free dielectric materials. This parameter change maintains the bandwidth-broadening function while eliminating the associated mass penalty, as dielectric materials have significantly lower density and mass compared to metal meshes and carbon composites.
Solution Approach 2:
The patent extracts and removes the heavy, lossy components (carbon-based materials and metal meshes) from the multi-layer structure, retaining only the essential functional element of having an intermediate layer. By replacing these extracted components with lightweight dielectric materials, the structure maintains its bandwidth-broadening capability while achieving significant mass reduction.
2Reliability
If different interlayer materials are selected according to different wave absorber materials, then the performance is optimized, but the design complexity increases and universality is reduced
Solution Approach 1:
The patent establishes a universal design principle by specifying that the intermediate layer should be made of loss-free dielectric materials regardless of the specific wave absorber material used in the outer layers. This universal approach simplifies the design process, as engineers no longer need to perform complex material matching calculations for each combination, while still achieving optimal performance through the consistent use of dielectric materials that provide impedance matching and resonance effects.
3Ease of manufacture
If traditional ferrite materials are used for wave absorption, then the material is easy to manufacture, but the saturation magnetization is low and the effective absorption bandwidth is limited
Solution Approach 1:
The patent employs composite material structures by combining wave absorber materials with loss-free dielectric materials in a multi-layer configuration. This composite approach allows the wave absorber layers to provide magnetic loss mechanisms while the dielectric layers contribute to impedance matching and resonance effects, achieving synergistic performance that broadens the effective absorption bandwidth beyond what traditional ferrite materials can achieve alone.
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 multi-layer structure significantly enhances effective absorption bandwidth while maintaining a low overall mass, offering higher universality and applicability across various composite materials.
Implementation Method 1
enhance impedance matching by modulating phases of electromagnetic waves
Implementation Method 2
modulating phases of electromagnetic waves
Implementation Method 3
wave absorbing materials... for the purpose of radiation protection and energy absorption of electromagnetic waves
Data Source
AI summary
The present disclosure relates to the technical field of microwave absorption, and in particular, to a multi-layer wave absorber structure and use thereof. The multi-layer wave absorber structure has a sandwich structure, and an intermediate layer of the sandwich structure is an electromagnetic loss-free dielectric layer. The electromagnetic loss-free dielectric layer includes a vacuum layer, an air layer, a paraffin layer, or a polytetrafluoroethylene layer. The added electromagnetic loss-free dielectric layer enhances impedance matching by modulating phases of electromagnetic waves, such that loss of the electromagnetic waves in a composite wave absorbing layer of the multi-layer wave absorber structure is enhanced, and an effective absorption bandwidth is further improved. The multi-layer wave absorber structure provided by the present disclosure has higher universality and operability, and has an effect of improving an effective absorption bandwidth for wave absorbing devices made of various composite wave absorbing materials.