Sheet-like Electromagnetic Wave Absorbing Body for High Frequency Coupling
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Solution Overview
Problem
High frequency communication devices face electromagnetic wave coupling issues due to metal case propagation and resonance, which existing electromagnetic wave absorbing bodies fail to effectively attenuate, especially considering the thickness and frequency-dependent interference effects.
Innovation Solution
A sheet-like electromagnetic wave absorbing body with soft magnetic particles dispersed in a non-metal matrix, designed to satisfy specific parameter relationships (α≥⅕ and m+⅕≤α≤m+⅘) that account for absorption energy and interference conditions, ensuring effective attenuation across various frequencies and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electromagnetic wave absorbing bodies with high absorption energy are used, then absorption energy is improved, but electromagnetic wave attenuation effectiveness deteriorates due to interference effects and thickness limitations
Solution Approach 1:
The patent changes the evaluation parameter from absorption energy alone to a comprehensive parameter that includes both absorption energy and thickness, accounting for interference effects. This allows selecting electromagnetic wave absorbing bodies that achieve both high absorption energy and effective attenuation by considering the combined influence of material properties and geometric dimensions.
Solution Approach 2:
The patent employs composite electromagnetic wave absorbing bodies consisting of magnetic particles dispersed in a resin matrix, combining materials with different electromagnetic properties. This composite structure enables simultaneous optimization of absorption energy and attenuation effectiveness by tuning the composition, particle characteristics, and matrix material.
2Loss of energy
If the thickness of electromagnetic wave absorbing body is increased, then absorption energy is improved, but device complexity and space requirements worsen
Solution Approach 1:
The patent establishes a quantitative relationship between thickness and absorption energy through the comprehensive parameter, enabling determination of the minimum effective thickness. This avoids unnecessary increases in thickness and associated complexity by identifying the optimal thickness range that achieves sufficient attenuation without excess material.
Solution Approach 2:
The patent uses simulation and measurement data to create design guidelines and selection criteria for electromagnetic wave absorbing bodies. These copied knowledge models allow engineers to select appropriate thickness and material combinations without extensive trial and error, reducing design complexity.
3Object-affected harmful factors
If electromagnetic wave absorbing bodies are provided in metal cases, then coupling between signals is reduced, but propagation and resonance of electromagnetic waves in the case still cause coupling
Solution Approach 1:
The patent specifies composite electromagnetic wave absorbing bodies with magnetic particles in a resin matrix, where the composite structure provides both absorption capability and appropriate electromagnetic impedance matching. This enables effective coupling reduction in metal cases by converting electromagnetic energy to heat while minimizing reflections that could cause resonance.
Solution Approach 2:
The patent determines optimal parameters for electromagnetic wave absorbing bodies including particle content, particle size, resin type, and thickness based on the specific application frequency and case geometry. By tuning these parameters, the absorbing body effectively attenuates electromagnetic waves across the operating frequency range, reducing coupling despite metal case resonance.
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 high electromagnetic wave attenuation efficiency, suitable for high frequency communication devices, by optimizing the thickness and material composition to balance absorption energy and interference effects, ensuring reliable signal processing and reduced coupling.
Implementation Method 1
particles including a soft magnetic material are dispersed in a matrix including a non-metal material
Implementation Method 2
particles including a soft magnetic material are dispersed in a matrix including a non-metal material
Implementation Method 3
electromagnetic wave absorbing body that is highly effective in attenuating electromagnetic waves
Data Source
AI summary
The present invention relates to an electromagnetic wave absorbing body which is a sheet-like electromagnetic wave absorbing body in which particles including a soft magnetic material are dispersed in a matrix including a non-metal material, in which the electromagnetic wave absorbing body satisfies a relationship: α≥⅕, in which α is a parameter given by Equation (1): α=Ad(εμ)0.5/(μ″+ε″μ/ε), in which d is a thickness of the electromagnetic wave absorbing body, ε, ε″, μ, and μ″ are a permittivity of the electromagnetic wave absorbing body, a loss term of ε, a permeability of the electromagnetic wave absorbing body, and a loss term of μ, respectively, and A is equal to 8×104/π(Ω/m).