Resin Composition for Stable Millimeter-Wave Absorption
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Solution Overview
Problem
Millimeter-wave radar systems suffer from noise due to both transmissive and reflective electromagnetic waves, leading to malfunctions, and existing resin compositions exhibit large variations in reflectance with frequency, affecting stability and productivity.
Innovation Solution
A resin composition containing a thermoplastic resin and a carbon-containing electromagnetic wave absorbing material, such as carbon nanotubes, with specific mass proportions and additives, achieving high absorbance, low transmittance, and minimal reflectance variation across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resin compositions are used for electromagnetic wave absorption, then the absorbance can be increased, but the reflectance varies significantly with frequency, affecting stability
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by introducing a specific hydroxyl group-containing compound (0.1-10 wt% relative to the resin). This compositional parameter change modifies the resin's electromagnetic wave interaction properties, resulting in stable reflectance across different frequencies while maintaining high absorbance
Solution Approach 2:
The patent creates a composite resin system by combining conventional electromagnetic wave absorbing materials with hydroxyl group-containing compounds. This composite approach synergistically improves both absorbance and reflectance stability, overcoming the limitations of single-material solutions
2Reliability
If electromagnetic wave absorbing materials are added to resin, then absorbance increases, but transmittance and reflectance remain problematic
Solution Approach 1:
The patent introduces hydroxyl group-containing compounds at specific local concentrations (0.1-10 wt% of the resin) to create zones of enhanced electromagnetic wave absorption. This localized modification optimizes the interaction between electromagnetic waves and the resin matrix, simultaneously reducing transmittance and reflectance while maintaining high absorbance
Solution Approach 2:
By adjusting the concentration parameter of hydroxyl group-containing compounds within the optimal range, the patent achieves a balance where absorbance is maximized while transmittance and reflectance are minimized. The specific parameter range ensures sufficient absorption without excessive reflection or transmission
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 resin composition provides consistent electromagnetic wave absorption with minimal reflectance variation, enhancing the stability and productivity of millimeter-wave radar systems.
Implementation Method 1
a resin composition containing a thermoplastic resin and an electromagnetic wave absorbing material, demonstrating an absorbance at 76.5 GHz frequency of 40.0 to 100%
Implementation Method 2
the electromagnetic wave absorbing material is a carbon-containing electromagnetic wave absorbing material
Implementation Method 3
containing 0.1 to 10.0 parts by mass of a carbon nanotube, per 100 parts by mass of the thermoplastic resin
Data Source
AI summary
A resin composition for electromagnetic wave absorber may have large absorbance of electromagnetic wave, small transmittance and reflectance of electromagnetic wave, and small variation of reflectance depending on frequency of electromagnetic wave. An electromagnetic wave absorber may use such a composition. The resin composition may contain 0.1 to 10.0 parts by mass of an electromagnetic wave absorbing material, per 100 parts by mass of a thermoplastic resin, demonstrating an absorbance at 76.5 GHz frequency of 40.0 to 100%, when formed to a size of 150 mm×150 mm×2 mm thick and determined by Equation (A); demonstrating a difference between the maximum and minimum value of reflectance in the range from 70 GHz to 80 GHz frequency of 20.0% or smaller, when formed to a size of 150 mm×150 mm×2 mm thick and determined by Equation (B); and being suited for use as an electromagnetic wave absorber.